/* * crypto wrapper functions for mbed TLS * * SPDX-FileCopyrightText: 2022 Glenn Strauss * SPDX-License-Identifier: BSD-3-Clause */ #include "utils/includes.h" #include "utils/common.h" #ifndef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_NONE #include #include /* mbedtls_platform_zeroize() */ #include #include #include #include #include #include #include #include #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA #include "supp_psa_api.h" #endif #ifndef MBEDTLS_PRIVATE #define MBEDTLS_PRIVATE(x) x #endif #define ENTROPY_MIN_PLATFORM 32 /* hostapd/wpa_supplicant provides forced_memzero(), * but prefer mbedtls_platform_zeroize() */ #define forced_memzero(ptr, sz) mbedtls_platform_zeroize(ptr, sz) #define IANA_SECP256R1 19 #define IANA_SECP384R1 20 #define IANA_SECP521R1 21 #ifdef CONFIG_MBEDTLS_ECDH_LEGACY_CONTEXT #define ACCESS_ECDH(S, var) S->MBEDTLS_PRIVATE(var) #else #define ACCESS_ECDH(S, var) S->MBEDTLS_PRIVATE(ctx).MBEDTLS_PRIVATE(mbed_ecdh).MBEDTLS_PRIVATE(var) #endif #ifndef __has_attribute #define __has_attribute(x) 0 #endif #ifndef __GNUC_PREREQ #define __GNUC_PREREQ(maj, min) 0 #endif #ifndef __attribute_cold__ #if __has_attribute(cold) || __GNUC_PREREQ(4, 3) #define __attribute_cold__ __attribute__((__cold__)) #else #define __attribute_cold__ #endif #endif #ifndef __attribute_noinline__ #if __has_attribute(noinline) || __GNUC_PREREQ(3, 1) #define __attribute_noinline__ __attribute__((__noinline__)) #else #define __attribute_noinline__ #endif #endif #include "crypto.h" #include "aes_wrap.h" #include "aes.h" #include "md5.h" #include "sha1.h" #include "sha256.h" #include "sha384.h" #include "sha512.h" /* * selective code inclusion based on preprocessor defines * * future: additional code could be wrapped with preprocessor checks if * wpa_supplicant/Makefile and hostap/Makefile were more consistent with * setting preprocessor defines for named groups of functionality */ #if defined(EAP_FAST) || defined(EAP_FAST_DYNAMIC) || defined(EAP_SERVER_FAST) || defined(EAP_TEAP) || \ defined(EAP_TEAP_DYNAMIC) || defined(EAP_SERVER_FAST) #define CRYPTO_MBEDTLS_SHA1_T_PRF #endif #if !defined(CONFIG_NO_PBKDF2) #define CRYPTO_MBEDTLS_PBKDF2_SHA1 #endif /* pbkdf2_sha1() */ #if defined(EAP_IKEV2) || defined(EAP_IKEV2_DYNAMIC) || defined(EAP_SERVER_IKEV2) /* CONFIG_EAP_IKEV2=y */ #define CRYPTO_MBEDTLS_CRYPTO_CIPHER #endif /* crypto_cipher_*() */ #if defined(EAP_PWD) || defined(EAP_SERVER_PWD) /* CONFIG_EAP_PWD=y */ \ || defined(CONFIG_SAE) /* CONFIG_SAE=y */ #define CRYPTO_MBEDTLS_CRYPTO_BIGNUM #endif /* crypto_bignum_*() */ #if defined(EAP_PWD) /* CONFIG_EAP_PWD=y */ \ || defined(EAP_EKE) /* CONFIG_EAP_EKE=y */ \ || defined(EAP_EKE_DYNAMIC) /* CONFIG_EAP_EKE=y */ \ || defined(EAP_SERVER_EKE) /* CONFIG_EAP_EKE=y */ \ || defined(EAP_IKEV2) /* CONFIG_EAP_IKEV2y */ \ || defined(EAP_IKEV2_DYNAMIC) /* CONFIG_EAP_IKEV2=y */ \ || defined(EAP_SERVER_IKEV2) /* CONFIG_EAP_IKEV2=y */ \ || defined(CONFIG_SAE) /* CONFIG_SAE=y */ \ || defined(CONFIG_WPS) /* CONFIG_WPS=y */ #define CRYPTO_MBEDTLS_CRYPTO_DH #if defined(CONFIG_WPS_NFC) #define CRYPTO_MBEDTLS_DH5_INIT_FIXED #endif /* dh5_init_fixed() */ #endif /* crypto_dh_*() */ #if defined(MBEDTLS_ECDH_C) || defined(CONFIG_PSA_WANT_ALG_ECDH) #define CRYPTO_MBEDTLS_CRYPTO_ECDH #endif /* crypto_ecdh_*() */ #define CRYPTO_MBEDTLS_CRYPTO_BIGNUM #if defined(CONFIG_DPP) || defined(CONFIG_SAE_PK) || defined(EAP_PWD) \ || defined(EAP_SERVER_PWD) || defined(CONFIG_SAE) #define CRYPTO_MBEDTLS_CRYPTO_EC #endif #if defined(CONFIG_DPP) /* CONFIG_DPP=y */ #define CRYPTO_MBEDTLS_CRYPTO_EC_DPP /* extra for DPP */ #define CRYPTO_MBEDTLS_CRYPTO_CSR #endif /* crypto_csr_*() */ #if defined(CONFIG_DPP2) /* CONFIG_DPP2=y */ #define CRYPTO_MBEDTLS_CRYPTO_PKCS7 #endif /* crypto_pkcs7_*() */ #if defined(EAP_SIM) || defined(EAP_SIM_DYNAMIC) || defined(EAP_SERVER_SIM) || defined(EAP_AKA) || \ defined(EAP_AKA_DYNAMIC) || defined(EAP_SERVER_AKA) || defined(CONFIG_AP) || defined(HOSTAPD) /* CONFIG_EAP_SIM=y CONFIG_EAP_AKA=y CONFIG_AP=y HOSTAPD */ #if defined(CRYPTO_RSA_OAEP_SHA256) #define CRYPTO_MBEDTLS_CRYPTO_RSA #endif #endif /* crypto_rsa_*() */ #if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) #include /* Setting ctr_drbg_init_state to 1 to allow unload_crypto to run */ static int ctr_drbg_init_state = 1; int (*hostap_rng_fn)(void*, unsigned char*, size_t) = mbedtls_psa_get_random; #else #include #include static int ctr_drbg_init_state; static mbedtls_ctr_drbg_context ctr_drbg; static mbedtls_entropy_context entropy; int(*hostap_rng_fn)(void*, unsigned char*, size_t) = mbedtls_ctr_drbg_random; #endif #ifdef CRYPTO_MBEDTLS_CRYPTO_BIGNUM #include static mbedtls_mpi mpi_sw_A; #endif #if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) static int wm_wrap_entropy_poll(void *data, unsigned char *output, size_t len, size_t *olen) { ((void)data); os_get_random(output, len); *olen = len; return 0; } __attribute_cold__ __attribute_noinline__ static mbedtls_ctr_drbg_context *ctr_drbg_init(void) { const unsigned char *custom_name = (const unsigned char *)"WPA_SUPPLICANT/HOSTAPD"; size_t custom_name_len = os_strlen((const char *)custom_name); mbedtls_ctr_drbg_init(&ctr_drbg); mbedtls_entropy_init(&entropy); mbedtls_entropy_add_source(&entropy, wm_wrap_entropy_poll, NULL, ENTROPY_MIN_PLATFORM, MBEDTLS_ENTROPY_SOURCE_STRONG); if (mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, custom_name, custom_name_len)) { wpa_printf(MSG_ERROR, "Init of random number generator failed"); /* XXX: abort? */ } else ctr_drbg_init_state = 1; return &ctr_drbg; } #endif __attribute_cold__ void crypto_unload(void) { if (ctr_drbg_init_state) { #if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) mbedtls_ctr_drbg_free(&ctr_drbg); mbedtls_entropy_free(&entropy); #endif #ifdef CRYPTO_MBEDTLS_CRYPTO_BIGNUM mbedtls_mpi_free(&mpi_sw_A); #endif ctr_drbg_init_state = 0; } } #if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) /* init ctr_drbg on first use * crypto_global_init() and crypto_global_deinit() are not available here * (available only when CONFIG_TLS=internal, which is not CONFIG_TLS=mbedtls) */ mbedtls_ctr_drbg_context *crypto_mbedtls_ctr_drbg(void); /*(not in header)*/ inline mbedtls_ctr_drbg_context *crypto_mbedtls_ctr_drbg(void) { return ctr_drbg_init_state ? &ctr_drbg : ctr_drbg_init(); } #endif void *hostap_rng_ctx(void) { #if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) return MBEDTLS_PSA_RANDOM_STATE; #else return (mbedtls_ctr_drbg_context *) crypto_mbedtls_ctr_drbg(); #endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */ } /* tradeoff: slightly smaller code size here at cost of slight increase * in instructions and function calls at runtime versus the expanded * per-message-digest code that follows in #else (~0.5 kib .text larger) */ __attribute_noinline__ static int md_vector( size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac, mbedtls_md_type_t md_type) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return md_vector_psa(num_elem, addr, len, mac, md_type); #else if (TEST_FAIL()) return -1; mbedtls_md_context_t ctx; mbedtls_md_init(&ctx); if (mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 0) != 0) { mbedtls_md_free(&ctx); return -1; } mbedtls_md_starts(&ctx); for (size_t i = 0; i < num_elem; ++i) mbedtls_md_update(&ctx, addr[i], len[i]); mbedtls_md_finish(&ctx, mac); mbedtls_md_free(&ctx); return 0; #endif } int sha512_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return md_vector(num_elem, addr, len, mac, MBEDTLS_MD_SHA512); } int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return md_vector(num_elem, addr, len, mac, MBEDTLS_MD_SHA384); } int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return md_vector(num_elem, addr, len, mac, MBEDTLS_MD_SHA256); } #if defined(MBEDTLS_SHA1_C) || defined(CONFIG_PSA_WANT_ALG_SHA_1) int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return md_vector(num_elem, addr, len, mac, MBEDTLS_MD_SHA1); } #endif #if defined(MBEDTLS_MD5_C) || defined(CONFIG_PSA_WANT_ALG_MD5) int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return md_vector(num_elem, addr, len, mac, MBEDTLS_MD_MD5); } #endif #ifdef MBEDTLS_MD4_C #include int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return md_vector(num_elem, addr, len, mac, MBEDTLS_MD_MD4); } #endif struct crypto_hash { mbedtls_md_context_t ctx; }; struct crypto_hash *crypto_hash_init(enum crypto_hash_alg alg, const u8 *key, size_t key_len) { struct crypto_hash *ctx; mbedtls_md_type_t md_type; const mbedtls_md_info_t *md_info; int ret = 0; switch (alg) { case CRYPTO_HASH_ALG_HMAC_MD5: md_type = MBEDTLS_MD_MD5; break; case CRYPTO_HASH_ALG_HMAC_SHA1: md_type = MBEDTLS_MD_SHA1; break; case CRYPTO_HASH_ALG_HMAC_SHA256: md_type = MBEDTLS_MD_SHA256; break; case CRYPTO_HASH_ALG_SHA384: md_type = MBEDTLS_MD_SHA384; break; case CRYPTO_HASH_ALG_SHA512: md_type = MBEDTLS_MD_SHA512; break; default: return NULL; } ctx = os_zalloc(sizeof(*ctx)); if (ctx == NULL) { return NULL; } mbedtls_md_init(&ctx->ctx); md_info = mbedtls_md_info_from_type(md_type); if (!md_info) { os_free(ctx); return NULL; } ret = mbedtls_md_setup(&ctx->ctx, md_info, 1); if (ret != 0) { os_free(ctx); return NULL; } mbedtls_md_hmac_starts(&ctx->ctx, key, key_len); return ctx; } void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len) { if (ctx == NULL) { return; } mbedtls_md_hmac_update(&ctx->ctx, data, len); } int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len) { if (ctx == NULL) { return -2; } if (mac == NULL || len == NULL) { mbedtls_md_free(&ctx->ctx); bin_clear_free(ctx, sizeof(*ctx)); return 0; } mbedtls_md_hmac_finish(&ctx->ctx, mac); mbedtls_md_free(&ctx->ctx); bin_clear_free(ctx, sizeof(*ctx)); return 0; } __attribute_noinline__ static int hmac_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac, mbedtls_md_type_t md_type) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return hmac_vector_psa(key, key_len, num_elem, addr, len, mac, md_type); #else if (TEST_FAIL()) return -1; mbedtls_md_context_t ctx; mbedtls_md_init(&ctx); if (mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 1) != 0) { mbedtls_md_free(&ctx); return -1; } mbedtls_md_hmac_starts(&ctx, key, key_len); for (size_t i = 0; i < num_elem; ++i) mbedtls_md_hmac_update(&ctx, addr[i], len[i]); mbedtls_md_hmac_finish(&ctx, mac); mbedtls_md_free(&ctx); return 0; #endif } int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return hmac_vector(key, key_len, num_elem, addr, len, mac, MBEDTLS_MD_SHA512); } int hmac_sha512(const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac) { return hmac_vector(key, key_len, 1, &data, &data_len, mac, MBEDTLS_MD_SHA512); } int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return hmac_vector(key, key_len, num_elem, addr, len, mac, MBEDTLS_MD_SHA384); } int hmac_sha384(const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac) { return hmac_vector(key, key_len, 1, &data, &data_len, mac, MBEDTLS_MD_SHA384); } int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return hmac_vector(key, key_len, num_elem, addr, len, mac, MBEDTLS_MD_SHA256); } int hmac_sha256(const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac) { return hmac_vector(key, key_len, 1, &data, &data_len, mac, MBEDTLS_MD_SHA256); } #if defined(MBEDTLS_SHA1_C) || defined(CONFIG_PSA_WANT_ALG_SHA_1) int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return hmac_vector(key, key_len, num_elem, addr, len, mac, MBEDTLS_MD_SHA1); } int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac) { return hmac_vector(key, key_len, 1, &data, &data_len, mac, MBEDTLS_MD_SHA1); } #endif #if defined(MBEDTLS_MD5_C) || defined(CONFIG_PSA_WANT_ALG_MD5) int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return hmac_vector(key, key_len, num_elem, addr, len, mac, MBEDTLS_MD_MD5); } int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len, u8 *mac) { return hmac_vector(key, key_len, 1, &data, &data_len, mac, MBEDTLS_MD_MD5); } #endif #ifdef MBEDTLS_HKDF_C #include /* sha256-kdf.c sha384-kdf.c sha512-kdf.c */ /* HMAC-SHA256 KDF (RFC 5295) and HKDF-Expand(SHA256) (RFC 5869) */ /* HMAC-SHA384 KDF (RFC 5295) and HKDF-Expand(SHA384) (RFC 5869) */ /* HMAC-SHA512 KDF (RFC 5295) and HKDF-Expand(SHA512) (RFC 5869) */ __attribute_noinline__ static int hmac_kdf_expand(const u8 *prk, size_t prk_len, const char *label, const u8 *info, size_t info_len, u8 *okm, size_t okm_len, mbedtls_md_type_t md_type) { if (TEST_FAIL()) return -1; const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type); if (label == NULL) /* RFC 5869 HKDF-Expand when (label == NULL) */ return mbedtls_hkdf_expand(md_info, prk, prk_len, info, info_len, okm, okm_len) ? -1 : 0; const size_t mac_len = mbedtls_md_get_size(md_info); /* okm_len must not exceed 255 times hash len (RFC 5869 Section 2.3) */ if (okm_len > ((mac_len << 8) - mac_len)) return -1; mbedtls_md_context_t ctx; mbedtls_md_init(&ctx); if (mbedtls_md_setup(&ctx, md_info, 1) != 0) { mbedtls_md_free(&ctx); return -1; } mbedtls_md_hmac_starts(&ctx, prk, prk_len); u8 iter = 1; const u8 *addr[4] = {okm, (const u8 *)label, info, &iter}; size_t len[4] = {0, label ? os_strlen(label) + 1 : 0, info_len, 1}; for (; okm_len >= mac_len; okm_len -= mac_len, ++iter) { for (size_t i = 0; i < ARRAY_SIZE(addr); ++i) mbedtls_md_hmac_update(&ctx, addr[i], len[i]); mbedtls_md_hmac_finish(&ctx, okm); mbedtls_md_hmac_reset(&ctx); addr[0] = okm; okm += mac_len; len[0] = mac_len; /*(include digest in subsequent rounds)*/ } if (okm_len) { u8 hash[MBEDTLS_MD_MAX_SIZE]; for (size_t i = 0; i < ARRAY_SIZE(addr); ++i) mbedtls_md_hmac_update(&ctx, addr[i], len[i]); mbedtls_md_hmac_finish(&ctx, hash); os_memcpy(okm, hash, okm_len); forced_memzero(hash, mac_len); } mbedtls_md_free(&ctx); return 0; } int hmac_sha512_kdf( const u8 *secret, size_t secret_len, const char *label, const u8 *seed, size_t seed_len, u8 *out, size_t outlen) { return hmac_kdf_expand(secret, secret_len, label, seed, seed_len, out, outlen, MBEDTLS_MD_SHA512); } int hmac_sha384_kdf( const u8 *secret, size_t secret_len, const char *label, const u8 *seed, size_t seed_len, u8 *out, size_t outlen) { return hmac_kdf_expand(secret, secret_len, label, seed, seed_len, out, outlen, MBEDTLS_MD_SHA384); } int hmac_sha256_kdf( const u8 *secret, size_t secret_len, const char *label, const u8 *seed, size_t seed_len, u8 *out, size_t outlen) { return hmac_kdf_expand(secret, secret_len, label, seed, seed_len, out, outlen, MBEDTLS_MD_SHA256); } #endif /* MBEDTLS_HKDF_C */ /* sha256-prf.c sha384-prf.c sha512-prf.c */ /* hmac_prf_bits - IEEE Std 802.11ac-2013, 11.6.1.7.2 Key derivation function */ __attribute_noinline__ static int hmac_prf_bits(const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len_bits, mbedtls_md_type_t md_type) { if (TEST_FAIL()) return -1; mbedtls_md_context_t ctx; mbedtls_md_init(&ctx); const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type(md_type); if (mbedtls_md_setup(&ctx, md_info, 1) != 0) { mbedtls_md_free(&ctx); return -1; } mbedtls_md_hmac_starts(&ctx, key, key_len); u16 ctr, n_le = host_to_le16(buf_len_bits); const u8 *const addr[] = {(u8 *)&ctr, (u8 *)label, data, (u8 *)&n_le}; const size_t len[] = {2, os_strlen(label), data_len, 2}; const size_t mac_len = mbedtls_md_get_size(md_info); size_t buf_len = (buf_len_bits + 7) / 8; for (ctr = 1; buf_len >= mac_len; buf_len -= mac_len, ++ctr) { #if __BYTE_ORDER == __BIG_ENDIAN ctr = host_to_le16(ctr); #endif for (size_t i = 0; i < ARRAY_SIZE(addr); ++i) mbedtls_md_hmac_update(&ctx, addr[i], len[i]); mbedtls_md_hmac_finish(&ctx, buf); mbedtls_md_hmac_reset(&ctx); buf += mac_len; #if __BYTE_ORDER == __BIG_ENDIAN ctr = le_to_host16(ctr); #endif } if (buf_len) { u8 hash[MBEDTLS_MD_MAX_SIZE]; #if __BYTE_ORDER == __BIG_ENDIAN ctr = host_to_le16(ctr); #endif for (size_t i = 0; i < ARRAY_SIZE(addr); ++i) mbedtls_md_hmac_update(&ctx, addr[i], len[i]); mbedtls_md_hmac_finish(&ctx, hash); os_memcpy(buf, hash, buf_len); buf += buf_len; forced_memzero(hash, mac_len); } /* Mask out unused bits in last octet if it does not use all the bits */ if ((buf_len_bits &= 0x7)) buf[-1] &= (u8)(0xff << (8 - buf_len_bits)); mbedtls_md_free(&ctx); return 0; } int sha512_prf( const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len) { return hmac_prf_bits(key, key_len, label, data, data_len, buf, buf_len * 8, MBEDTLS_MD_SHA512); } int sha384_prf( const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len) { return hmac_prf_bits(key, key_len, label, data, data_len, buf, buf_len * 8, MBEDTLS_MD_SHA384); } #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA /** * Based on Supplicant internal implementaion of SHA-256. This API * uses PSA APIs instead of Supplicant internal implementation or * mbedtls APIs. */ static int hmac_prf256(const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf_in, size_t buf_len_bits, mbedtls_md_type_t md_type) { unsigned short ctr, n_le = host_to_le16(buf_len_bits); const u8 *addr[] = {(u8 *)&ctr, (u8 *)label, data, (u8 *)&n_le}; const size_t len[] = {2, os_strlen(label), data_len, 2}; size_t buf_len = (buf_len_bits + 7) / 8; u8 *buf = buf_in; for (ctr = 1; buf_len >= SHA256_MAC_LEN; buf_len -= SHA256_MAC_LEN, ++ctr) { if (hmac_sha256_vector(key, key_len, 4, addr, len, buf)) return -1; buf += SHA256_MAC_LEN; } if (buf_len) { u8 hash[SHA256_MAC_LEN]; if (hmac_sha256_vector(key, key_len, 4, addr, len, hash)) return -1; os_memcpy(buf, hash, buf_len); forced_memzero(hash, sizeof(hash)); } /* Mask out unused bits in last octet if it does not use all the bits */ if ((buf_len_bits &= 0x7)) buf[-1] &= (u8)(0xff << (8 - buf_len_bits)); return 0; } #endif /* CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA */ int sha256_prf( const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return hmac_prf256(key, key_len, label, data, data_len, buf, buf_len * 8, MBEDTLS_MD_SHA256); #else return hmac_prf_bits(key, key_len, label, data, data_len, buf, buf_len * 8, MBEDTLS_MD_SHA256); #endif } int sha256_prf_bits( const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len_bits) { return hmac_prf_bits(key, key_len, label, data, data_len, buf, buf_len_bits, MBEDTLS_MD_SHA256); } #if defined(MBEDTLS_SHA1_C) || defined(CONFIG_PSA_WANT_ALG_SHA_1) /* sha1-prf.c */ /* sha1_prf - SHA1-based Pseudo-Random Function (PRF) (IEEE 802.11i, 8.5.1.1) */ int sha1_prf(const u8 *key, size_t key_len, const char *label, const u8 *data, size_t data_len, u8 *buf, size_t buf_len) { /*(note: algorithm differs from hmac_prf_bits() */ /*(note: smaller code size instead of expanding hmac_sha1_vector() * as is done in hmac_prf_bits(); not expecting large num of loops) */ u8 counter = 0; const u8 *addr[] = {(u8 *)label, data, &counter}; const size_t len[] = {os_strlen(label) + 1, data_len, 1}; for (; buf_len >= SHA1_MAC_LEN; buf_len -= SHA1_MAC_LEN, ++counter) { if (hmac_sha1_vector(key, key_len, 3, addr, len, buf)) return -1; buf += SHA1_MAC_LEN; } if (buf_len) { u8 hash[SHA1_MAC_LEN]; if (hmac_sha1_vector(key, key_len, 3, addr, len, hash)) return -1; os_memcpy(buf, hash, buf_len); forced_memzero(hash, sizeof(hash)); } return 0; } #ifdef CRYPTO_MBEDTLS_SHA1_T_PRF /* sha1-tprf.c */ /* sha1_t_prf - EAP-FAST Pseudo-Random Function (T-PRF) (RFC 4851,Section 5.5)*/ int sha1_t_prf( const u8 *key, size_t key_len, const char *label, const u8 *seed, size_t seed_len, u8 *buf, size_t buf_len) { /*(note: algorithm differs from hmac_prf_bits() and hmac_kdf() above)*/ /*(note: smaller code size instead of expanding hmac_sha1_vector() * as is done in hmac_prf_bits(); not expecting large num of loops) */ u8 ctr; u16 olen = host_to_be16(buf_len); const u8 *addr[] = {buf, (u8 *)label, seed, (u8 *)&olen, &ctr}; size_t len[] = {0, os_strlen(label) + 1, seed_len, 2, 1}; for (ctr = 1; buf_len >= SHA1_MAC_LEN; buf_len -= SHA1_MAC_LEN, ++ctr) { if (hmac_sha1_vector(key, key_len, 5, addr, len, buf)) return -1; addr[0] = buf; buf += SHA1_MAC_LEN; len[0] = SHA1_MAC_LEN; /*(include digest in subsequent rounds)*/ } if (buf_len) { u8 hash[SHA1_MAC_LEN]; if (hmac_sha1_vector(key, key_len, 5, addr, len, hash)) return -1; os_memcpy(buf, hash, buf_len); forced_memzero(hash, sizeof(hash)); } return 0; } #endif /* CRYPTO_MBEDTLS_SHA1_T_PRF */ #endif /* MBEDTLS_SHA1_C || CONFIG_PSA_WANT_ALG_SHA_1 */ #ifdef MBEDTLS_DES_C #include int des_encrypt(const u8 *clear, const u8 *key, u8 *cypher) { u8 pkey[8], next, tmp; int i; /* Add parity bits to the key */ next = 0; for (i = 0; i < 7; i++) { tmp = key[i]; pkey[i] = (tmp >> i) | next | 1; next = tmp << (7 - i); } pkey[i] = next | 1; mbedtls_des_context des; mbedtls_des_init(&des); int ret = mbedtls_des_setkey_enc(&des, pkey) || mbedtls_des_crypt_ecb(&des, clear, cypher) ? -1 : 0; mbedtls_des_free(&des); return ret; } #endif #ifdef CRYPTO_MBEDTLS_PBKDF2_SHA1 /* sha1-pbkdf2.c */ #include int pbkdf2_sha1(const char *passphrase, const u8 *ssid, size_t ssid_len, int iterations, u8 *buf, size_t buflen) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return pbkdf2_sha1_psa(MBEDTLS_MD_SHA1, (const u8 *)passphrase, os_strlen(passphrase), ssid, ssid_len, iterations, 32, buf) ? -1: 0; #else #if MBEDTLS_VERSION_NUMBER >= 0x03020200 /* mbedtls 3.2.2 */ return mbedtls_pkcs5_pbkdf2_hmac_ext(MBEDTLS_MD_SHA1, (const u8 *)passphrase, os_strlen(passphrase), ssid, ssid_len, iterations, 32, buf) ? -1 : 0; #else const mbedtls_md_info_t *md_info; md_info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA1); if (md_info == NULL) return -1; mbedtls_md_context_t ctx; mbedtls_md_init(&ctx); int ret = mbedtls_md_setup(&ctx, md_info, 1) || mbedtls_pkcs5_pbkdf2_hmac(&ctx, (const u8 *)passphrase, os_strlen(passphrase), ssid, ssid_len, iterations, 32, buf) ? -1 : 0; mbedtls_md_free(&ctx); return ret; #endif #endif /* CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA */ } #endif #include "aes_wrap.h" #ifdef MBEDTLS_NIST_KW_C #include /* aes-wrap.c */ int aes_wrap(const u8 *kek, size_t kek_len, int n, const u8 *plain, u8 *cipher) { if (TEST_FAIL()) return -1; mbedtls_nist_kw_context ctx; mbedtls_nist_kw_init(&ctx); size_t olen; int ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES, kek, kek_len * 8, 1) || mbedtls_nist_kw_wrap(&ctx, MBEDTLS_KW_MODE_KW, plain, n * 8, cipher, &olen, (n + 1) * 8) ? -1 : 0; mbedtls_nist_kw_free(&ctx); return ret; } /* aes-unwrap.c */ int aes_unwrap(const u8 *kek, size_t kek_len, int n, const u8 *cipher, u8 *plain) { if (TEST_FAIL()) return -1; mbedtls_nist_kw_context ctx; mbedtls_nist_kw_init(&ctx); size_t olen; int ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES, kek, kek_len * 8, 0) || mbedtls_nist_kw_unwrap(&ctx, MBEDTLS_KW_MODE_KW, cipher, (n + 1) * 8, plain, &olen, n * 8) ? -1 : 0; mbedtls_nist_kw_free(&ctx); return ret; } #endif /* MBEDTLS_NIST_KW_C */ #if defined(MBEDTLS_CMAC_C) || defined(CONFIG_PSA_WANT_ALG_CMAC) /* aes-omac1.c */ #include int omac1_aes_vector(const u8 *key, size_t key_len, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return omac1_aes_vector_psa(key, key_len, num_elem, addr, len, mac); #else if (TEST_FAIL()) return -1; mbedtls_cipher_type_t cipher_type; switch (key_len) { case 16: cipher_type = MBEDTLS_CIPHER_AES_128_ECB; break; case 24: cipher_type = MBEDTLS_CIPHER_AES_192_ECB; break; case 32: cipher_type = MBEDTLS_CIPHER_AES_256_ECB; break; default: return -1; } const mbedtls_cipher_info_t *cipher_info; cipher_info = mbedtls_cipher_info_from_type(cipher_type); if (cipher_info == NULL) return -1; mbedtls_cipher_context_t ctx; mbedtls_cipher_init(&ctx); int ret = -1; if (mbedtls_cipher_setup(&ctx, cipher_info) == 0 && mbedtls_cipher_cmac_starts(&ctx, key, key_len * 8) == 0) { ret = 0; for (size_t i = 0; i < num_elem && ret == 0; ++i) ret = mbedtls_cipher_cmac_update(&ctx, addr[i], len[i]); } if (ret == 0) ret = mbedtls_cipher_cmac_finish(&ctx, mac); mbedtls_cipher_free(&ctx); return ret ? -1 : 0; #endif } int omac1_aes_128_vector(const u8 *key, size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac) { return omac1_aes_vector(key, 16, num_elem, addr, len, mac); } int omac1_aes_128(const u8 *key, const u8 *data, size_t data_len, u8 *mac) { return omac1_aes_vector(key, 16, 1, &data, &data_len, mac); } int omac1_aes_256(const u8 *key, const u8 *data, size_t data_len, u8 *mac) { return omac1_aes_vector(key, 32, 1, &data, &data_len, mac); } #else //#include "aes-omac1.c" /* pull in hostap local implementation */ #ifndef MBEDTLS_AES_BLOCK_SIZE #define MBEDTLS_AES_BLOCK_SIZE 16 #endif #endif /* MBEDTLS_CMAC_C */ #if defined(MBEDTLS_AES_C) || defined(CONFIG_PSA_WANT_KEY_TYPE_AES) /* These interfaces can be inefficient when used in loops, as the overhead of * initialization each call is large for each block input (e.g. 16 bytes) */ /* aes-encblock.c */ int aes_128_encrypt_block(const u8 *key, const u8 *in, u8 *out) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return aes_128_encrypt_block_psa(key, in, out); #else if (TEST_FAIL()) return -1; mbedtls_aes_context aes; mbedtls_aes_init(&aes); int ret = mbedtls_aes_setkey_enc(&aes, key, 128) || mbedtls_aes_crypt_ecb(&aes, MBEDTLS_AES_ENCRYPT, in, out) ? -1 : 0; mbedtls_aes_free(&aes); return ret; #endif } /* aes-ctr.c */ int aes_ctr_encrypt(const u8 *key, size_t key_len, const u8 *nonce, u8 *data, size_t data_len) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA return aes_ctr_encrypt_psa(key, key_len, nonce, data, data_len); #else if (TEST_FAIL()) return -1; unsigned char counter[MBEDTLS_AES_BLOCK_SIZE]; unsigned char stream_block[MBEDTLS_AES_BLOCK_SIZE]; os_memcpy(counter, nonce, MBEDTLS_AES_BLOCK_SIZE); /*(must be writable)*/ mbedtls_aes_context ctx; mbedtls_aes_init(&ctx); size_t nc_off = 0; int ret = mbedtls_aes_setkey_enc(&ctx, key, key_len * 8) || mbedtls_aes_crypt_ctr(&ctx, data_len, &nc_off, counter, stream_block, data, data) ? -1 : 0; forced_memzero(stream_block, sizeof(stream_block)); mbedtls_aes_free(&ctx); return ret; #endif } int aes_128_ctr_encrypt(const u8 *key, const u8 *nonce, u8 *data, size_t data_len) { return aes_ctr_encrypt(key, 16, nonce, data, data_len); } /* aes-cbc.c */ static int aes_128_cbc_oper(const u8 *key, const u8 *iv, u8 *data, size_t data_len, int mode) { #ifdef CONFIG_WIFI_NM_WPA_SUPPLICANT_CRYPTO_MBEDTLS_PSA if (mode == MBEDTLS_AES_ENCRYPT) return aes_128_cbc_encrypt_psa(key, iv, data, data_len); else return aes_128_cbc_decrypt_psa(key, iv, data, data_len); #else unsigned char ivec[MBEDTLS_AES_BLOCK_SIZE]; os_memcpy(ivec, iv, MBEDTLS_AES_BLOCK_SIZE); /*(must be writable)*/ mbedtls_aes_context ctx; mbedtls_aes_init(&ctx); int ret = (mode == MBEDTLS_AES_ENCRYPT ? mbedtls_aes_setkey_enc(&ctx, key, 128) : mbedtls_aes_setkey_dec(&ctx, key, 128)) || mbedtls_aes_crypt_cbc(&ctx, mode, data_len, ivec, data, data); mbedtls_aes_free(&ctx); return ret ? -1 : 0; #endif } int aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len) { if (TEST_FAIL()) return -1; return aes_128_cbc_oper(key, iv, data, data_len, MBEDTLS_AES_ENCRYPT); } int aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len) { if (TEST_FAIL()) return -1; return aes_128_cbc_oper(key, iv, data, data_len, MBEDTLS_AES_DECRYPT); } #endif /* * Much of the following is documented in crypto.h as for CONFIG_TLS=internal * but such comments are not accurate: * * "This function is only used with internal TLSv1 implementation * (CONFIG_TLS=internal). If that is not used, the crypto wrapper does not need * to implement this." */ #ifdef CRYPTO_MBEDTLS_CRYPTO_CIPHER #include struct crypto_cipher { mbedtls_cipher_context_t ctx_enc; mbedtls_cipher_context_t ctx_dec; }; struct crypto_cipher *crypto_cipher_init(enum crypto_cipher_alg alg, const u8 *iv, const u8 *key, size_t key_len) { /* IKEv2 src/eap_common/ikev2_common.c:ikev2_{encr,decr}_encrypt() * uses one of CRYPTO_CIPHER_ALG_AES or CRYPTO_CIPHER_ALG_3DES */ mbedtls_cipher_type_t cipher_type; size_t iv_len; switch (alg) { #ifdef MBEDTLS_AES_C case CRYPTO_CIPHER_ALG_AES: if (key_len == 16) cipher_type = MBEDTLS_CIPHER_AES_128_CTR; if (key_len == 24) cipher_type = MBEDTLS_CIPHER_AES_192_CTR; if (key_len == 32) cipher_type = MBEDTLS_CIPHER_AES_256_CTR; iv_len = 16; break; #endif #ifdef MBEDTLS_DES_C case CRYPTO_CIPHER_ALG_3DES: cipher_type = MBEDTLS_CIPHER_DES_EDE3_CBC; iv_len = 8; break; #endif default: return NULL; } const mbedtls_cipher_info_t *cipher_info; cipher_info = mbedtls_cipher_info_from_type(cipher_type); if (cipher_info == NULL) return NULL; key_len *= 8; /* key_bitlen */ struct crypto_cipher *ctx = os_malloc(sizeof(*ctx)); if (!ctx) return NULL; mbedtls_cipher_init(&ctx->ctx_enc); mbedtls_cipher_init(&ctx->ctx_dec); if (mbedtls_cipher_setup(&ctx->ctx_enc, cipher_info) == 0 && mbedtls_cipher_setup(&ctx->ctx_dec, cipher_info) == 0 && mbedtls_cipher_setkey(&ctx->ctx_enc, key, key_len, MBEDTLS_ENCRYPT) == 0 && mbedtls_cipher_setkey(&ctx->ctx_dec, key, key_len, MBEDTLS_DECRYPT) == 0 && mbedtls_cipher_set_iv(&ctx->ctx_enc, iv, iv_len) == 0 && mbedtls_cipher_set_iv(&ctx->ctx_dec, iv, iv_len) == 0 && mbedtls_cipher_reset(&ctx->ctx_enc) == 0 && mbedtls_cipher_reset(&ctx->ctx_dec) == 0) { return ctx; } mbedtls_cipher_free(&ctx->ctx_enc); mbedtls_cipher_free(&ctx->ctx_dec); os_free(ctx); return NULL; } int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain, u8 *crypt, size_t len) { size_t olen = 0; /*(poor interface above; unknown size of u8 *crypt)*/ return (mbedtls_cipher_update(&ctx->ctx_enc, plain, len, crypt, &olen) || mbedtls_cipher_finish(&ctx->ctx_enc, crypt + olen, &olen)) ? -1 : 0; } int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt, u8 *plain, size_t len) { size_t olen = 0; /*(poor interface above; unknown size of u8 *plain)*/ return (mbedtls_cipher_update(&ctx->ctx_dec, crypt, len, plain, &olen) || mbedtls_cipher_finish(&ctx->ctx_dec, plain + olen, &olen)) ? -1 : 0; } void crypto_cipher_deinit(struct crypto_cipher *ctx) { mbedtls_cipher_free(&ctx->ctx_enc); mbedtls_cipher_free(&ctx->ctx_dec); os_free(ctx); } #endif /* CRYPTO_MBEDTLS_CRYPTO_CIPHER */ #ifdef CRYPTO_MBEDTLS_CRYPTO_BIGNUM #include /* crypto.h bignum interfaces */ struct crypto_bignum *crypto_bignum_init(void) { if (TEST_FAIL()) return NULL; mbedtls_mpi *bn = os_malloc(sizeof(*bn)); if (bn) mbedtls_mpi_init(bn); return (struct crypto_bignum *)bn; } struct crypto_bignum *crypto_bignum_init_set(const u8 *buf, size_t len) { if (TEST_FAIL()) return NULL; mbedtls_mpi *bn = os_malloc(sizeof(*bn)); if (bn) { mbedtls_mpi_init(bn); if (mbedtls_mpi_read_binary(bn, buf, len) == 0) return (struct crypto_bignum *)bn; } os_free(bn); return NULL; } struct crypto_bignum *crypto_bignum_init_uint(unsigned int val) { if (TEST_FAIL()) return NULL; mbedtls_mpi *bn = os_malloc(sizeof(*bn)); if (bn) { mbedtls_mpi_init(bn); if (mbedtls_mpi_lset(bn, (int)val) == 0) return (struct crypto_bignum *)bn; } os_free(bn); return NULL; } void crypto_bignum_deinit(struct crypto_bignum *n, int clear) { mbedtls_mpi_free((mbedtls_mpi *)n); os_free(n); } int crypto_bignum_to_bin(const struct crypto_bignum *a, u8 *buf, size_t buflen, size_t padlen) { if (TEST_FAIL()) return -1; size_t n = mbedtls_mpi_size((mbedtls_mpi *)a); if (n < padlen) n = padlen; return n > buflen || mbedtls_mpi_write_binary((mbedtls_mpi *)a, buf, n) ? -1 : (int)(n); } int crypto_bignum_rand(struct crypto_bignum *r, const struct crypto_bignum *m) { if (TEST_FAIL()) return -1; /*assert(r != m);*/ /* r must not be same as m for mbedtls_mpi_random()*/ #if MBEDTLS_VERSION_NUMBER >= 0x021B0000 /* mbedtls 2.27.0 */ return mbedtls_mpi_random((mbedtls_mpi *)r, 0, (mbedtls_mpi *)m, hostap_rng_fn, hostap_rng_ctx()) ? -1 : 0; #else /* (needed by EAP_PWD, SAE, DPP) */ wpa_printf(MSG_ERROR, "mbedtls 2.27.0 or later required for mbedtls_mpi_random()"); return -1; #endif } int crypto_bignum_add(const struct crypto_bignum *a, const struct crypto_bignum *b, struct crypto_bignum *c) { return mbedtls_mpi_add_mpi((mbedtls_mpi *)c, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) ? -1 : 0; } int crypto_bignum_mod(const struct crypto_bignum *a, const struct crypto_bignum *b, struct crypto_bignum *c) { return mbedtls_mpi_mod_mpi((mbedtls_mpi *)c, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) ? -1 : 0; } int crypto_bignum_exptmod(const struct crypto_bignum *a, const struct crypto_bignum *b, const struct crypto_bignum *c, struct crypto_bignum *d) { if (TEST_FAIL()) return -1; /* (check if input params match d; d is the result) */ /* (a == d) is ok in current mbedtls implementation */ if (b == d || c == d) { /*(not ok; store result in intermediate)*/ mbedtls_mpi R; mbedtls_mpi_init(&R); int rc = mbedtls_mpi_exp_mod(&R, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b, (const mbedtls_mpi *)c, NULL) || mbedtls_mpi_copy((mbedtls_mpi *)d, &R) ? -1 : 0; mbedtls_mpi_free(&R); return rc; } else { return mbedtls_mpi_exp_mod((mbedtls_mpi *)d, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b, (const mbedtls_mpi *)c, NULL) ? -1 : 0; } } int crypto_bignum_inverse(const struct crypto_bignum *a, const struct crypto_bignum *b, struct crypto_bignum *c) { if (TEST_FAIL()) return -1; return mbedtls_mpi_inv_mod((mbedtls_mpi *)c, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) ? -1 : 0; } int crypto_bignum_sub(const struct crypto_bignum *a, const struct crypto_bignum *b, struct crypto_bignum *c) { if (TEST_FAIL()) return -1; return mbedtls_mpi_sub_mpi((mbedtls_mpi *)c, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) ? -1 : 0; } int crypto_bignum_div(const struct crypto_bignum *a, const struct crypto_bignum *b, struct crypto_bignum *c) { if (TEST_FAIL()) return -1; /*(most current use of this crypto.h interface has a == c (result), * so store result in an intermediate to avoid overwritten input)*/ mbedtls_mpi R; mbedtls_mpi_init(&R); int rc = mbedtls_mpi_div_mpi(&R, NULL, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) || mbedtls_mpi_copy((mbedtls_mpi *)c, &R) ? -1 : 0; mbedtls_mpi_free(&R); return rc; } int crypto_bignum_addmod(const struct crypto_bignum *a, const struct crypto_bignum *b, const struct crypto_bignum *c, struct crypto_bignum *d) { if (TEST_FAIL()) return -1; return mbedtls_mpi_add_mpi((mbedtls_mpi *)d, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) || mbedtls_mpi_mod_mpi((mbedtls_mpi *)d, (mbedtls_mpi *)d, (const mbedtls_mpi *)c) ? -1 : 0; } int crypto_bignum_mulmod(const struct crypto_bignum *a, const struct crypto_bignum *b, const struct crypto_bignum *c, struct crypto_bignum *d) { if (TEST_FAIL()) return -1; return mbedtls_mpi_mul_mpi((mbedtls_mpi *)d, (const mbedtls_mpi *)a, (const mbedtls_mpi *)b) || mbedtls_mpi_mod_mpi((mbedtls_mpi *)d, (mbedtls_mpi *)d, (const mbedtls_mpi *)c) ? -1 : 0; } int crypto_bignum_sqrmod(const struct crypto_bignum *a, const struct crypto_bignum *b, struct crypto_bignum *c) { if (TEST_FAIL()) return -1; #if 1 return crypto_bignum_mulmod(a, a, b, c); #else mbedtls_mpi bn; mbedtls_mpi_init(&bn); if (mbedtls_mpi_lset(&bn, 2)) /* alt?: mbedtls_mpi_set_bit(&bn, 1) */ return -1; int ret = mbedtls_mpi_exp_mod((mbedtls_mpi *)c, (const mbedtls_mpi *)a, &bn, (const mbedtls_mpi *)b, NULL) ? -1 : 0; mbedtls_mpi_free(&bn); return ret; #endif } int crypto_bignum_rshift(const struct crypto_bignum *a, int n, struct crypto_bignum *r) { return mbedtls_mpi_copy((mbedtls_mpi *)r, (const mbedtls_mpi *)a) || mbedtls_mpi_shift_r((mbedtls_mpi *)r, n) ? -1 : 0; } int crypto_bignum_cmp(const struct crypto_bignum *a, const struct crypto_bignum *b) { return mbedtls_mpi_cmp_mpi((const mbedtls_mpi *)a, (const mbedtls_mpi *)b); } int crypto_bignum_is_zero(const struct crypto_bignum *a) { /* XXX: src/common/sae.c:sswu() contains comment: * "TODO: Make sure crypto_bignum_is_zero() is constant time" * Note: mbedtls_mpi_cmp_int() *is not* constant time */ return (mbedtls_mpi_cmp_int((const mbedtls_mpi *)a, 0) == 0); } int crypto_bignum_is_one(const struct crypto_bignum *a) { return (mbedtls_mpi_cmp_int((const mbedtls_mpi *)a, 1) == 0); } int crypto_bignum_is_odd(const struct crypto_bignum *a) { return mbedtls_mpi_get_bit((const mbedtls_mpi *)a, 0); } #include "utils/const_time.h" int crypto_bignum_legendre(const struct crypto_bignum *a, const struct crypto_bignum *p) { if (TEST_FAIL()) return -2; /* Security Note: * mbedtls_mpi_exp_mod() is not documented to run in constant time, * though mbedtls/library/bignum.c uses constant_time_internal.h funcs. * Compare to crypto_openssl.c:crypto_bignum_legendre() * which uses openssl BN_mod_exp_mont_consttime() * mbedtls/library/ecp.c has further countermeasures to timing attacks, * (but ecp.c funcs are not used here) */ mbedtls_mpi exp, tmp; mbedtls_mpi_init(&exp); mbedtls_mpi_init(&tmp); /* exp = (p-1) / 2 */ int res; if (mbedtls_mpi_sub_int(&exp, (const mbedtls_mpi *)p, 1) == 0 && mbedtls_mpi_shift_r(&exp, 1) == 0 && mbedtls_mpi_exp_mod(&tmp, (const mbedtls_mpi *)a, &exp, (const mbedtls_mpi *)p, NULL) == 0) { /*(modified from crypto_openssl.c:crypto_bignum_legendre())*/ /* Return 1 if tmp == 1, 0 if tmp == 0, or -1 otherwise. Need * to use constant time selection to avoid branches here. */ unsigned int mask; res = -1; mask = const_time_eq((mbedtls_mpi_cmp_int(&tmp, 1) == 0), 1); res = const_time_select_int(mask, 1, res); mask = const_time_eq((mbedtls_mpi_cmp_int(&tmp, 0) == 0), 1); res = const_time_select_int(mask, 0, res); } else { res = -2; } mbedtls_mpi_free(&tmp); mbedtls_mpi_free(&exp); return res; } #endif /* CRYPTO_MBEDTLS_CRYPTO_BIGNUM */ #ifdef CRYPTO_MBEDTLS_CRYPTO_DH /* crypto_internal-modexp.c */ #include #include static int crypto_mbedtls_dh_set_bin_pg(mbedtls_dhm_context *ctx, u8 generator, const u8 *prime, size_t prime_len) { /*(could set these directly in MBEDTLS_PRIVATE members)*/ mbedtls_mpi P, G; mbedtls_mpi_init(&P); mbedtls_mpi_init(&G); int ret = mbedtls_mpi_lset(&G, generator) || mbedtls_mpi_read_binary(&P, prime, prime_len) || mbedtls_dhm_set_group(ctx, &P, &G); mbedtls_mpi_free(&P); mbedtls_mpi_free(&G); return ret; } __attribute_noinline__ static int crypto_mbedtls_dh_init_public( mbedtls_dhm_context *ctx, u8 generator, const u8 *prime, size_t prime_len, u8 *privkey, u8 *pubkey) { if (crypto_mbedtls_dh_set_bin_pg(ctx, generator, prime, prime_len) || mbedtls_dhm_make_public(ctx, (int)prime_len, pubkey, prime_len, hostap_rng_fn, hostap_rng_ctx())) return -1; return mbedtls_mpi_write_binary(&ctx->MBEDTLS_PRIVATE(X), privkey, prime_len) ? -1 : 0; } int crypto_dh_init(u8 generator, const u8 *prime, size_t prime_len, u8 *privkey, u8 *pubkey) { if (TEST_FAIL()) return -1; /* Prefer to use mbedtls to derive our public/private key, as doing so * leverages mbedtls to properly format output and to perform blinding*/ mbedtls_dhm_context ctx; mbedtls_dhm_init(&ctx); int ret = crypto_mbedtls_dh_init_public(&ctx, generator, prime, prime_len, privkey, pubkey); mbedtls_dhm_free(&ctx); return ret; } /*(crypto_dh_derive_secret() could be implemented using crypto.h APIs * instead of being reimplemented in each crypto_*.c)*/ int crypto_dh_derive_secret(u8 generator, const u8 *prime, size_t prime_len, const u8 *order, size_t order_len, const u8 *privkey, size_t privkey_len, const u8 *pubkey, size_t pubkey_len, u8 *secret, size_t *len) { if (TEST_FAIL()) return -1; /* Prefer to use mbedtls to derive DH shared secret, as doing so * leverages mbedtls to validate params and to perform blinding. * * Attempt to reconstitute DH context to derive shared secret * (due to limitations of the interface, which ought to pass context). * Force provided G (our private key) into context without validation. * Regenerating GX (our public key) not needed to derive shared secret. */ /*(older compilers might not support VLAs)*/ /*unsigned char buf[2+prime_len+2+1+2+pubkey_len];*/ unsigned char buf[2 + MBEDTLS_MPI_MAX_SIZE + 2 + 1 + 2 + MBEDTLS_MPI_MAX_SIZE]; unsigned char *p = buf + 2 + prime_len; if (2 + prime_len + 2 + 1 + 2 + pubkey_len > sizeof(buf)) return -1; WPA_PUT_BE16(buf, prime_len); /*(2-byte big-endian size of prime)*/ p[0] = 0; /*(2-byte big-endian size of generator)*/ p[1] = 1; p[2] = generator; WPA_PUT_BE16(p + 3, pubkey_len); /*(2-byte big-endian size of pubkey)*/ os_memcpy(p + 5, pubkey, pubkey_len); os_memcpy(buf + 2, prime, prime_len); mbedtls_dhm_context ctx; mbedtls_dhm_init(&ctx); p = buf; int ret = mbedtls_dhm_read_params(&ctx, &p, p + 2 + prime_len + 5 + pubkey_len) || mbedtls_mpi_read_binary(&ctx.MBEDTLS_PRIVATE(X), privkey, privkey_len) || mbedtls_dhm_calc_secret(&ctx, secret, *len, len, hostap_rng_fn, hostap_rng_ctx()) ? -1 : 0; mbedtls_dhm_free(&ctx); return ret; } /* dh_group5.c */ #include "dh_group5.h" /* RFC3526_PRIME_1536[] and RFC3526_GENERATOR_1536[] from crypto_wolfssl.c */ static const unsigned char RFC3526_PRIME_1536[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34, 0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74, 0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22, 0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD, 0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B, 0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37, 0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45, 0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6, 0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B, 0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED, 0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5, 0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6, 0x49, 0x28, 0x66, 0x51, 0xEC, 0xE4, 0x5B, 0x3D, 0xC2, 0x00, 0x7C, 0xB8, 0xA1, 0x63, 0xBF, 0x05, 0x98, 0xDA, 0x48, 0x36, 0x1C, 0x55, 0xD3, 0x9A, 0x69, 0x16, 0x3F, 0xA8, 0xFD, 0x24, 0xCF, 0x5F, 0x83, 0x65, 0x5D, 0x23, 0xDC, 0xA3, 0xAD, 0x96, 0x1C, 0x62, 0xF3, 0x56, 0x20, 0x85, 0x52, 0xBB, 0x9E, 0xD5, 0x29, 0x07, 0x70, 0x96, 0x96, 0x6D, 0x67, 0x0C, 0x35, 0x4E, 0x4A, 0xBC, 0x98, 0x04, 0xF1, 0x74, 0x6C, 0x08, 0xCA, 0x23, 0x73, 0x27, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; static const unsigned char RFC3526_GENERATOR_1536[] = {0x02}; void *dh5_init(struct wpabuf **priv, struct wpabuf **publ) { const unsigned char *const prime = RFC3526_PRIME_1536; const size_t prime_len = sizeof(RFC3526_PRIME_1536); const u8 generator = *RFC3526_GENERATOR_1536; struct wpabuf *wpubl = NULL, *wpriv = NULL; mbedtls_dhm_context *ctx = os_malloc(sizeof(*ctx)); if (ctx == NULL) return NULL; mbedtls_dhm_init(ctx); if ((wpubl = wpabuf_alloc(prime_len)) && (wpriv = wpabuf_alloc(prime_len)) && crypto_mbedtls_dh_init_public(ctx, generator, prime, prime_len, wpabuf_put(wpriv, prime_len), wpabuf_put(wpubl, prime_len)) == 0) { wpabuf_free(*publ); wpabuf_clear_free(*priv); *publ = wpubl; *priv = wpriv; return ctx; } wpabuf_clear_free(wpriv); wpabuf_free(wpubl); mbedtls_dhm_free(ctx); os_free(ctx); return NULL; } #ifdef CRYPTO_MBEDTLS_DH5_INIT_FIXED void *dh5_init_fixed(const struct wpabuf *priv, const struct wpabuf *publ) { const unsigned char *const prime = RFC3526_PRIME_1536; const size_t prime_len = sizeof(RFC3526_PRIME_1536); const u8 generator = *RFC3526_GENERATOR_1536; mbedtls_dhm_context *ctx = os_malloc(sizeof(*ctx)); if (ctx == NULL) return NULL; mbedtls_dhm_init(ctx); if (crypto_mbedtls_dh_set_bin_pg(ctx, generator, prime, prime_len) == 0 && mbedtls_mpi_read_binary(&ctx->MBEDTLS_PRIVATE(X), wpabuf_head(priv), wpabuf_len(priv)) == 0) { return ctx; } mbedtls_dhm_free(ctx); os_free(ctx); return NULL; } #endif struct wpabuf *dh5_derive_shared(void *ctx, const struct wpabuf *peer_public, const struct wpabuf *own_private) { /*((mbedtls_dhm_context *)ctx must already contain own_private)*/ /* mbedtls 2.x: prime_len = ctx->len; */ /* mbedtls 3.x: prime_len = mbedtls_dhm_get_len(ctx); */ size_t olen = sizeof(RFC3526_PRIME_1536); /*(sizeof(); prime known)*/ struct wpabuf *buf = wpabuf_alloc(olen); if (buf == NULL) return NULL; if (mbedtls_dhm_read_public((mbedtls_dhm_context *)ctx, wpabuf_head(peer_public), wpabuf_len(peer_public)) == 0 && mbedtls_dhm_calc_secret(ctx, wpabuf_mhead(buf), olen, &olen, hostap_rng_fn, hostap_rng_ctx()) == 0) { wpabuf_put(buf, olen); return buf; } wpabuf_free(buf); return NULL; } void dh5_free(void *ctx) { mbedtls_dhm_free(ctx); os_free(ctx); } #endif /* CRYPTO_MBEDTLS_CRYPTO_DH */ #if defined(CRYPTO_MBEDTLS_CRYPTO_ECDH) || defined(CRYPTO_MBEDTLS_CRYPTO_EC) #include #define CRYPTO_EC_pbits(e) (((mbedtls_ecp_group *)(e))->pbits) #define CRYPTO_EC_plen(e) ((((mbedtls_ecp_group *)(e))->pbits + 7) >> 3) #define CRYPTO_EC_P(e) (&((mbedtls_ecp_group *)(e))->P) #define CRYPTO_EC_N(e) (&((mbedtls_ecp_group *)(e))->N) #define CRYPTO_EC_A(e) (&((mbedtls_ecp_group *)(e))->A) #define CRYPTO_EC_B(e) (&((mbedtls_ecp_group *)(e))->B) #define CRYPTO_EC_G(e) (&((mbedtls_ecp_group *)(e))->G) static mbedtls_ecp_group_id crypto_mbedtls_ecp_group_id_from_ike_id(int group) { /* https://www.iana.org/assignments/ikev2-parameters/ikev2-parameters.xhtml */ switch (group) { #ifdef MBEDTLS_ECP_DP_SECP256R1_ENABLED case 19: return MBEDTLS_ECP_DP_SECP256R1; #endif #ifdef MBEDTLS_ECP_DP_SECP384R1_ENABLED case 20: return MBEDTLS_ECP_DP_SECP384R1; #endif #ifdef MBEDTLS_ECP_DP_SECP521R1_ENABLED case 21: return MBEDTLS_ECP_DP_SECP521R1; #endif #ifdef MBEDTLS_ECP_DP_SECP192R1_ENABLED case 25: return MBEDTLS_ECP_DP_SECP192R1; #endif #ifdef MBEDTLS_ECP_DP_SECP224R1_ENABLED case 26: return MBEDTLS_ECP_DP_SECP224R1; #endif #ifdef MBEDTLS_ECP_DP_BP256R1_ENABLED case 28: return MBEDTLS_ECP_DP_BP256R1; #endif #ifdef MBEDTLS_ECP_DP_BP384R1_ENABLED case 29: return MBEDTLS_ECP_DP_BP384R1; #endif #ifdef MBEDTLS_ECP_DP_BP512R1_ENABLED case 30: return MBEDTLS_ECP_DP_BP512R1; #endif #ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED case 31: return MBEDTLS_ECP_DP_CURVE25519; #endif #ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED case 32: return MBEDTLS_ECP_DP_CURVE448; #endif default: return MBEDTLS_ECP_DP_NONE; } } #endif /* CRYPTO_MBEDTLS_CRYPTO_ECDH || CRYPTO_MBEDTLS_CRYPTO_EC */ #ifdef CRYPTO_MBEDTLS_CRYPTO_EC static int crypto_mbedtls_ike_id_from_ecp_group_id(mbedtls_ecp_group_id grp_id) { /* https://www.iana.org/assignments/ikev2-parameters/ikev2-parameters.xhtml */ /*(for crypto_ec_key_group())*/ switch (grp_id) { #ifdef MBEDTLS_ECP_DP_SECP256R1_ENABLED case MBEDTLS_ECP_DP_SECP256R1: return 19; #endif #ifdef MBEDTLS_ECP_DP_SECP384R1_ENABLED case MBEDTLS_ECP_DP_SECP384R1: return 20; #endif #ifdef MBEDTLS_ECP_DP_SECP521R1_ENABLED case MBEDTLS_ECP_DP_SECP521R1: return 21; #endif #ifdef MBEDTLS_ECP_DP_SECP192R1_ENABLED case MBEDTLS_ECP_DP_SECP192R1: return 25; #endif #ifdef MBEDTLS_ECP_DP_SECP224R1_ENABLED case MBEDTLS_ECP_DP_SECP224R1: return 26; #endif #ifdef MBEDTLS_ECP_DP_BP256R1_ENABLED case MBEDTLS_ECP_DP_BP256R1: return 28; #endif #ifdef MBEDTLS_ECP_DP_BP384R1_ENABLED case MBEDTLS_ECP_DP_BP384R1: return 29; #endif #ifdef MBEDTLS_ECP_DP_BP512R1_ENABLED case MBEDTLS_ECP_DP_BP512R1: return 30; #endif #ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED case MBEDTLS_ECP_DP_CURVE25519: return 31; #endif #ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED case MBEDTLS_ECP_DP_CURVE448: return 32; #endif default: return -1; } } #endif /* CRYPTO_MBEDTLS_CRYPTO_EC */ #if defined(CRYPTO_MBEDTLS_CRYPTO_ECDH) || defined(CRYPTO_MBEDTLS_CRYPTO_EC_DPP) #include #include static int crypto_mbedtls_keypair_gen(int group, mbedtls_pk_context *pk) { mbedtls_ecp_group_id grp_id = crypto_mbedtls_ecp_group_id_from_ike_id(group); if (grp_id == MBEDTLS_ECP_DP_NONE) return -1; const mbedtls_pk_info_t *pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY); if (pk_info == NULL) return -1; return mbedtls_pk_setup(pk, pk_info) || mbedtls_ecp_gen_key(grp_id, mbedtls_pk_ec(*pk), hostap_rng_fn, hostap_rng_ctx()) ? -1 : 0; } #endif #ifdef CRYPTO_MBEDTLS_CRYPTO_ECDH #include #include #include #include /* wrap mbedtls_ecdh_context for more future-proof direct access to components * (mbedtls_ecdh_context internal implementation may change between releases) * * If mbedtls_pk_context -- specifically underlying mbedtls_ecp_keypair -- * lifetime were guaranteed to be longer than that of mbedtls_ecdh_context, * then mbedtls_pk_context or mbedtls_ecp_keypair could be stored in crypto_ecdh * (or crypto_ec_key could be stored in crypto_ecdh, and crypto_ec_key could * wrap mbedtls_ecp_keypair and components, to avoid MBEDTLS_PRIVATE access) */ struct crypto_ecdh { mbedtls_ecdh_context ctx; mbedtls_ecp_group grp; mbedtls_ecp_point Q; }; struct crypto_ec { mbedtls_ecp_group group; }; struct crypto_ecdh *crypto_ecdh_init(int group) { mbedtls_pk_context pk; mbedtls_pk_init(&pk); struct crypto_ecdh *ecdh = crypto_mbedtls_keypair_gen(group, &pk) == 0 ? crypto_ecdh_init2(group, (struct crypto_ec_key *)&pk) : NULL; mbedtls_pk_free(&pk); return ecdh; } struct crypto_ecdh *crypto_ecdh_init2(int group, struct crypto_ec_key *own_key) { mbedtls_ecp_group_id grp_id = crypto_mbedtls_ecp_group_id_from_ike_id(group); if (grp_id == MBEDTLS_ECP_DP_NONE) return NULL; mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)own_key); struct crypto_ecdh *ecdh = os_malloc(sizeof(*ecdh)); if (ecdh == NULL) return NULL; mbedtls_ecdh_init(&ecdh->ctx); mbedtls_ecp_group_init(&ecdh->grp); mbedtls_ecp_point_init(&ecdh->Q); if (mbedtls_ecdh_setup(&ecdh->ctx, grp_id) == 0 && mbedtls_ecdh_get_params(&ecdh->ctx, ecp_kp, MBEDTLS_ECDH_OURS) == 0) { /* copy grp and Q for later use * (retrieving this info later is more convoluted * even if mbedtls_ecdh_make_public() is considered)*/ #if MBEDTLS_VERSION_NUMBER >= 0x03020000 /* mbedtls 3.2.0 */ mbedtls_mpi d; mbedtls_mpi_init(&d); if (mbedtls_ecp_export(ecp_kp, &ecdh->grp, &d, &ecdh->Q) == 0) { mbedtls_mpi_free(&d); return ecdh; } mbedtls_mpi_free(&d); #else if (mbedtls_ecp_group_load(&ecdh->grp, grp_id) == 0 && mbedtls_ecp_copy(&ecdh->Q, &ecp_kp->MBEDTLS_PRIVATE(Q)) == 0) return ecdh; #endif } mbedtls_ecp_point_free(&ecdh->Q); mbedtls_ecp_group_free(&ecdh->grp); mbedtls_ecdh_free(&ecdh->ctx); os_free(ecdh); return NULL; } struct wpabuf *crypto_ecdh_get_pubkey(struct crypto_ecdh *ecdh, int inc_y) { mbedtls_ecp_group *grp = &ecdh->grp; size_t len = CRYPTO_EC_plen(grp); #ifdef MBEDTLS_ECP_MONTGOMERY_ENABLED /* len */ #endif #ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED if (mbedtls_ecp_get_type(grp) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS) len = inc_y ? len * 2 + 1 : len + 1; #endif struct wpabuf *buf = wpabuf_alloc(len); if (buf == NULL) return NULL; inc_y = inc_y ? MBEDTLS_ECP_PF_UNCOMPRESSED : MBEDTLS_ECP_PF_COMPRESSED; if (mbedtls_ecp_point_write_binary(grp, &ecdh->Q, inc_y, &len, wpabuf_mhead_u8(buf), len) == 0) { wpabuf_put(buf, len); return buf; } wpabuf_free(buf); return NULL; } #if defined(MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED) static int crypto_mbedtls_short_weierstrass_derive_y(mbedtls_ecp_group *grp, mbedtls_mpi *bn, int parity_bit) { /* y^2 = x^3 + ax + b * sqrt(w) = w^((p+1)/4) mod p (for prime p where p = 3 mod 4) */ mbedtls_mpi *cy2 = (mbedtls_mpi *)crypto_ec_point_compute_y_sqr((struct crypto_ec *)grp, (const struct crypto_bignum *)bn); /*x*/ if (cy2 == NULL) return -1; /*mbedtls_mpi_free(bn);*/ /*(reuse bn to store result (y))*/ mbedtls_mpi exp; mbedtls_mpi_init(&exp); int ret = mbedtls_mpi_get_bit(&grp->P, 0) != 1 /*(p = 3 mod 4)*/ || mbedtls_mpi_get_bit(&grp->P, 1) != 1 /*(p = 3 mod 4)*/ || mbedtls_mpi_add_int(&exp, &grp->P, 1) || mbedtls_mpi_shift_r(&exp, 2) || mbedtls_mpi_exp_mod(bn, cy2, &exp, &grp->P, NULL) || (mbedtls_mpi_get_bit(bn, 0) != parity_bit && mbedtls_mpi_sub_mpi(bn, &grp->P, bn)); mbedtls_mpi_free(&exp); mbedtls_mpi_free(cy2); os_free(cy2); return ret; } #endif struct wpabuf *crypto_ecdh_set_peerkey(struct crypto_ecdh *ecdh, int inc_y, const u8 *key, size_t len) { if (len == 0) /*(invalid peer key)*/ return NULL; mbedtls_ecp_group *grp = &ecdh->grp; #if defined(MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED) if (mbedtls_ecp_get_type(grp) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS) { /* add header for mbedtls_ecdh_read_public() */ u8 buf[256]; if (sizeof(buf) - 1 < len) return NULL; buf[0] = (u8)(len); os_memcpy(buf + 1, key, len); if (inc_y) { if (!(len & 1)) { /*(dpp code/tests does not include tag?!?)*/ if (sizeof(buf) - 2 < len) return NULL; buf[0] = (u8)(1 + len); buf[1] = 0x04; os_memcpy(buf + 2, key, len); } len >>= 1; /*(repurpose len to prime_len)*/ } else if (key[0] == 0x02 || key[0] == 0x03) { /* (inc_y == 0) */ --len; /*(repurpose len to prime_len)*/ /* mbedtls_ecp_point_read_binary() does not currently support * MBEDTLS_ECP_PF_COMPRESSED format (buf[1] = 0x02 or 0x03) * (returns MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE) */ /* derive y, amend buf[] with y for UNCOMPRESSED format */ if (sizeof(buf) - 2 < len * 2 || len == 0) return NULL; buf[0] = (u8)(1 + len * 2); buf[1] = 0x04; mbedtls_mpi bn; mbedtls_mpi_init(&bn); int ret = mbedtls_mpi_read_binary(&bn, key + 1, len) || crypto_mbedtls_short_weierstrass_derive_y(grp, &bn, key[0] & 1) || mbedtls_mpi_write_binary(&bn, buf + 2 + len, len); mbedtls_mpi_free(&bn); if (ret != 0) return NULL; } if (key[0] == 0) /*(repurpose len to prime_len)*/ len = CRYPTO_EC_plen(grp); if (mbedtls_ecdh_read_public(&ecdh->ctx, buf, buf[0] + 1)) return NULL; } #endif #if defined(MBEDTLS_ECP_MONTGOMERY_ENABLED) if (mbedtls_ecp_get_type(grp) == MBEDTLS_ECP_TYPE_MONTGOMERY) { if (mbedtls_ecdh_read_public(&ecdh->ctx, key, len)) return NULL; } #endif struct wpabuf *buf = wpabuf_alloc(len); if (buf == NULL) return NULL; if (mbedtls_ecdh_calc_secret(&ecdh->ctx, &len, wpabuf_mhead(buf), len, hostap_rng_fn, hostap_rng_ctx()) == 0) { wpabuf_put(buf, len); return buf; } wpabuf_clear_free(buf); return NULL; } void crypto_ecdh_deinit(struct crypto_ecdh *ecdh) { if (ecdh == NULL) return; mbedtls_ecp_point_free(&ecdh->Q); mbedtls_ecp_group_free(&ecdh->grp); mbedtls_ecdh_free(&ecdh->ctx); os_free(ecdh); } size_t crypto_ecdh_prime_len(struct crypto_ecdh *ecdh) { return CRYPTO_EC_plen(&ecdh->grp); } #endif /* CRYPTO_MBEDTLS_CRYPTO_ECDH */ #if defined(CRYPTO_MBEDTLS_CRYPTO_EC) #include struct crypto_ec *crypto_ec_init(int group) { mbedtls_ecp_group_id grp_id = crypto_mbedtls_ecp_group_id_from_ike_id(group); if (grp_id == MBEDTLS_ECP_DP_NONE) return NULL; mbedtls_ecp_group *e = os_malloc(sizeof(*e)); if (e == NULL) return NULL; mbedtls_ecp_group_init(e); if (mbedtls_ecp_group_load(e, grp_id) == 0) return (struct crypto_ec *)e; mbedtls_ecp_group_free(e); os_free(e); return NULL; } void crypto_ec_deinit(struct crypto_ec *e) { mbedtls_ecp_group_free((mbedtls_ecp_group *)e); os_free(e); } size_t crypto_ec_prime_len(struct crypto_ec *e) { return CRYPTO_EC_plen(e); } size_t crypto_ec_prime_len_bits(struct crypto_ec *e) { return CRYPTO_EC_pbits(e); } size_t crypto_ec_order_len(struct crypto_ec *e) { return (mbedtls_mpi_bitlen(CRYPTO_EC_N(e)) + 7) / 8; } const struct crypto_bignum *crypto_ec_get_prime(struct crypto_ec *e) { return (const struct crypto_bignum *)CRYPTO_EC_P(e); } const struct crypto_bignum *crypto_ec_get_order(struct crypto_ec *e) { return (const struct crypto_bignum *)CRYPTO_EC_N(e); } const struct crypto_bignum *crypto_ec_get_a(struct crypto_ec *e) { #ifdef MBEDTLS_ECP_DP_SECP256R1_ENABLED static const uint8_t secp256r1_a[] = {0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc}; #endif #ifdef MBEDTLS_ECP_DP_SECP384R1_ENABLED static const uint8_t secp384r1_a[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xfc}; #endif #ifdef MBEDTLS_ECP_DP_SECP521R1_ENABLED static const uint8_t secp521r1_a[] = { 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc}; #endif #ifdef MBEDTLS_ECP_DP_SECP192R1_ENABLED static const uint8_t secp192r1_a[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc}; #endif #ifdef MBEDTLS_ECP_DP_SECP224R1_ENABLED static const uint8_t secp224r1_a[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe}; #endif const uint8_t *bin = NULL; size_t len = 0; /* (mbedtls groups matching supported sswu_curve_param() IKE groups) */ switch (((mbedtls_ecp_group *)e)->id) { #ifdef MBEDTLS_ECP_DP_SECP256R1_ENABLED case MBEDTLS_ECP_DP_SECP256R1: bin = secp256r1_a; len = sizeof(secp256r1_a); break; #endif #ifdef MBEDTLS_ECP_DP_SECP384R1_ENABLED case MBEDTLS_ECP_DP_SECP384R1: bin = secp384r1_a; len = sizeof(secp384r1_a); break; #endif #ifdef MBEDTLS_ECP_DP_SECP521R1_ENABLED case MBEDTLS_ECP_DP_SECP521R1: bin = secp521r1_a; len = sizeof(secp521r1_a); break; #endif #ifdef MBEDTLS_ECP_DP_SECP192R1_ENABLED case MBEDTLS_ECP_DP_SECP192R1: bin = secp192r1_a; len = sizeof(secp192r1_a); break; #endif #ifdef MBEDTLS_ECP_DP_SECP224R1_ENABLED case MBEDTLS_ECP_DP_SECP224R1: bin = secp224r1_a; len = sizeof(secp224r1_a); break; #endif #ifdef MBEDTLS_ECP_DP_BP256R1_ENABLED case MBEDTLS_ECP_DP_BP256R1: return (const struct crypto_bignum *)CRYPTO_EC_A(e); #endif #ifdef MBEDTLS_ECP_DP_BP384R1_ENABLED case MBEDTLS_ECP_DP_BP384R1: return (const struct crypto_bignum *)CRYPTO_EC_A(e); #endif #ifdef MBEDTLS_ECP_DP_BP512R1_ENABLED case MBEDTLS_ECP_DP_BP512R1: return (const struct crypto_bignum *)CRYPTO_EC_A(e); #endif #ifdef MBEDTLS_ECP_DP_CURVE25519_ENABLED case MBEDTLS_ECP_DP_CURVE25519: return (const struct crypto_bignum *)CRYPTO_EC_A(e); #endif #ifdef MBEDTLS_ECP_DP_CURVE448_ENABLED case MBEDTLS_ECP_DP_CURVE448: return (const struct crypto_bignum *)CRYPTO_EC_A(e); #endif default: return NULL; } /*(note: not thread-safe; returns file-scoped static storage)*/ if (mbedtls_mpi_read_binary(&mpi_sw_A, bin, len) == 0) return (const struct crypto_bignum *)&mpi_sw_A; return NULL; } const struct crypto_bignum *crypto_ec_get_b(struct crypto_ec *e) { return (const struct crypto_bignum *)CRYPTO_EC_B(e); } const struct crypto_ec_point *crypto_ec_get_generator(struct crypto_ec *e) { return (const struct crypto_ec_point *)CRYPTO_EC_G(e); } struct crypto_ec_point *crypto_ec_point_init(struct crypto_ec *e) { if (TEST_FAIL()) return NULL; mbedtls_ecp_point *p = os_malloc(sizeof(*p)); if (p != NULL) mbedtls_ecp_point_init(p); return (struct crypto_ec_point *)p; } void crypto_ec_point_deinit(struct crypto_ec_point *p, int clear) { mbedtls_ecp_point_free((mbedtls_ecp_point *)p); os_free(p); } int crypto_ec_point_x(struct crypto_ec *e, const struct crypto_ec_point *p, struct crypto_bignum *x) { mbedtls_mpi *px = &((mbedtls_ecp_point *)p)->MBEDTLS_PRIVATE(X); return mbedtls_mpi_copy((mbedtls_mpi *)x, px) ? -1 : 0; } int crypto_ec_point_to_bin(struct crypto_ec *e, const struct crypto_ec_point *point, u8 *x, u8 *y) { if (TEST_FAIL()) return -1; /* crypto.h documents crypto_ec_point_to_bin() output is big-endian */ size_t len = CRYPTO_EC_plen(e); if (x) { mbedtls_mpi *px = &((mbedtls_ecp_point *)point)->MBEDTLS_PRIVATE(X); if (mbedtls_mpi_write_binary(px, x, len)) return -1; } if (y) { mbedtls_mpi *py = &((mbedtls_ecp_point *)point)->MBEDTLS_PRIVATE(Y); if (mbedtls_mpi_write_binary(py, y, len)) return -1; } return 0; } struct crypto_ec_point *crypto_ec_point_from_bin(struct crypto_ec *e, const u8 *val) { if (TEST_FAIL()) return NULL; size_t len = CRYPTO_EC_plen(e); mbedtls_ecp_point *p = os_malloc(sizeof(*p)); u8 buf[1 + MBEDTLS_MPI_MAX_SIZE * 2]; if (p == NULL) return NULL; mbedtls_ecp_point_init(p); #ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED if (mbedtls_ecp_get_type((mbedtls_ecp_group *)e) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS) { buf[0] = 0x04; os_memcpy(buf + 1, val, len * 2); if (mbedtls_ecp_point_read_binary((mbedtls_ecp_group *)e, p, buf, 1 + len * 2) == 0) return (struct crypto_ec_point *)p; } #endif #ifdef MBEDTLS_ECP_MONTGOMERY_ENABLED if (mbedtls_ecp_get_type((mbedtls_ecp_group *)e) == MBEDTLS_ECP_TYPE_MONTGOMERY) { /* crypto.h interface documents crypto_ec_point_from_bin() * val is length: prime_len * 2 and is big-endian * (Short Weierstrass is assumed by hostap) * Reverse to little-endian format for Montgomery */ for (unsigned int i = 0; i < len; ++i) buf[i] = val[len - 1 - i]; if (mbedtls_ecp_point_read_binary((mbedtls_ecp_group *)e, p, buf, len) == 0) return (struct crypto_ec_point *)p; } #endif mbedtls_ecp_point_free(p); os_free(p); return NULL; } int crypto_ec_point_add(struct crypto_ec *e, const struct crypto_ec_point *a, const struct crypto_ec_point *b, struct crypto_ec_point *c) { if (TEST_FAIL()) return -1; /* mbedtls does not provide an mbedtls_ecp_point add function */ mbedtls_mpi one; mbedtls_mpi_init(&one); int ret = mbedtls_mpi_lset(&one, 1) || mbedtls_ecp_muladd((mbedtls_ecp_group *)e, (mbedtls_ecp_point *)c, &one, (const mbedtls_ecp_point *)a, &one, (const mbedtls_ecp_point *)b) ? -1 : 0; mbedtls_mpi_free(&one); return ret; } int crypto_ec_point_mul(struct crypto_ec *e, const struct crypto_ec_point *p, const struct crypto_bignum *b, struct crypto_ec_point *res) { if (TEST_FAIL()) return -1; return mbedtls_ecp_mul((mbedtls_ecp_group *)e, (mbedtls_ecp_point *)res, (const mbedtls_mpi *)b, (const mbedtls_ecp_point *)p, hostap_rng_fn, hostap_rng_ctx()) ? -1 : 0; } int crypto_ec_point_invert(struct crypto_ec *e, struct crypto_ec_point *p) { if (TEST_FAIL()) return -1; if (mbedtls_ecp_get_type((mbedtls_ecp_group *)e) == MBEDTLS_ECP_TYPE_MONTGOMERY) { /* e.g. MBEDTLS_ECP_DP_CURVE25519 and MBEDTLS_ECP_DP_CURVE448 */ wpa_printf(MSG_ERROR, "%s not implemented for Montgomery curves", __func__); return -1; } /* mbedtls does not provide an mbedtls_ecp_point invert function */ /* below works for Short Weierstrass; incorrect for Montgomery curves */ mbedtls_mpi *py = &((mbedtls_ecp_point *)p)->MBEDTLS_PRIVATE(Y); return mbedtls_ecp_is_zero((mbedtls_ecp_point *)p) /*point at infinity*/ || mbedtls_mpi_cmp_int(py, 0) == 0 /*point is its own inverse*/ || mbedtls_mpi_sub_abs(py, CRYPTO_EC_P(e), py) == 0 ? 0 : -1; } #ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED static int crypto_ec_point_y_sqr_weierstrass(mbedtls_ecp_group *e, const mbedtls_mpi *x, mbedtls_mpi *y2) { /* MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS y^2 = x^3 + a x + b */ /* Short Weierstrass elliptic curve group w/o A set treated as A = -3 */ /* Attempt to match mbedtls/library/ecp.c:ecp_check_pubkey_sw() behavior * and elsewhere in mbedtls/library/ecp.c where if A is not set, it is * treated as if A = -3. */ /* y^2 = x^3 + ax + b = (x^2 + a)x + b */ return /* x^2 */ mbedtls_mpi_mul_mpi(y2, x, x) || mbedtls_mpi_mod_mpi(y2, y2, &e->P) /* x^2 + a */ || (e->A.MBEDTLS_PRIVATE(p) ? mbedtls_mpi_add_mpi(y2, y2, &e->A) : mbedtls_mpi_sub_int(y2, y2, 3)) || mbedtls_mpi_mod_mpi(y2, y2, &e->P) /* (x^2 + a)x */ || mbedtls_mpi_mul_mpi(y2, y2, x) || mbedtls_mpi_mod_mpi(y2, y2, &e->P) /* (x^2 + a)x + b */ || mbedtls_mpi_add_mpi(y2, y2, &e->B) || mbedtls_mpi_mod_mpi(y2, y2, &e->P); } #endif /* MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */ struct crypto_bignum *crypto_ec_point_compute_y_sqr(struct crypto_ec *e, const struct crypto_bignum *x) { if (TEST_FAIL()) return NULL; mbedtls_mpi *y2 = os_malloc(sizeof(*y2)); if (y2 == NULL) return NULL; mbedtls_mpi_init(y2); #ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED if (mbedtls_ecp_get_type((mbedtls_ecp_group *)e) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS && crypto_ec_point_y_sqr_weierstrass((mbedtls_ecp_group *)e, (const mbedtls_mpi *)x, y2) == 0) return (struct crypto_bignum *)y2; #endif mbedtls_mpi_free(y2); os_free(y2); return NULL; } int crypto_ec_point_is_at_infinity(struct crypto_ec *e, const struct crypto_ec_point *p) { return mbedtls_ecp_is_zero((mbedtls_ecp_point *)p); } int crypto_ec_point_is_on_curve(struct crypto_ec *e, const struct crypto_ec_point *p) { return mbedtls_ecp_check_pubkey((const mbedtls_ecp_group *)e, (const mbedtls_ecp_point *)p) == 0; } int crypto_ec_point_cmp(const struct crypto_ec *e, const struct crypto_ec_point *a, const struct crypto_ec_point *b) { return mbedtls_ecp_point_cmp((const mbedtls_ecp_point *)a, (const mbedtls_ecp_point *)b); } #if !defined(CONFIG_NO_STDOUT_DEBUG) void crypto_ec_point_debug_print(const struct crypto_ec *e, const struct crypto_ec_point *p, const char *title) { u8 x[MBEDTLS_MPI_MAX_SIZE]; u8 y[MBEDTLS_MPI_MAX_SIZE]; size_t len = CRYPTO_EC_plen(e); /* crypto_ec_point_to_bin ought to take (const struct crypto_ec *e) */ struct crypto_ec *ee; *(const struct crypto_ec **)&ee = e; /*(cast away const)*/ if (crypto_ec_point_to_bin(ee, p, x, y) == 0) { if (title) wpa_printf(MSG_DEBUG, "%s", title); wpa_hexdump(MSG_DEBUG, "x:", x, len); wpa_hexdump(MSG_DEBUG, "y:", y, len); } } #else void crypto_ec_point_debug_print(const struct crypto_ec *e, const struct crypto_ec_point *p, const char *title) { // Fixing linking error undefined reference to `crypto_ec_point_debug_print' } #endif struct crypto_ec_key *crypto_ec_key_parse_priv(const u8 *der, size_t der_len) { mbedtls_pk_context *ctx = os_malloc(sizeof(*ctx)); if (ctx == NULL) return NULL; mbedtls_pk_init(ctx); #if MBEDTLS_VERSION_NUMBER < 0x03000000 /* mbedtls 3.0.0 */ if (mbedtls_pk_parse_key(ctx, der, der_len, NULL, 0) == 0) #else if (mbedtls_pk_parse_key(ctx, der, der_len, NULL, 0, hostap_rng_fn, hostap_rng_ctx()) == 0) #endif return (struct crypto_ec_key *)ctx; mbedtls_pk_free(ctx); os_free(ctx); return NULL; } #include #include static int crypto_mbedtls_pk_parse_subpubkey_compressed(mbedtls_pk_context *ctx, const u8 *der, size_t der_len) { /* The following is modified from: * mbedtls/library/pkparse.c:mbedtls_pk_parse_subpubkey() * mbedtls/library/pkparse.c:pk_get_pk_alg() * mbedtls/library/pkparse.c:pk_use_ecparams() */ mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE; const mbedtls_pk_info_t *pk_info; int ret; size_t len; const unsigned char *end = der + der_len; unsigned char *p; *(const unsigned char **)&p = der; if ((ret = mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) { return (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_KEY_INVALID_FORMAT, ret)); } end = p + len; /* if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, &alg_params ) ) != 0 ) return( ret ); */ mbedtls_asn1_buf alg_oid, params; memset(¶ms, 0, sizeof(mbedtls_asn1_buf)); if ((ret = mbedtls_asn1_get_alg(&p, end, &alg_oid, ¶ms)) != 0) return (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_ALG, ret)); if (mbedtls_oid_get_pk_alg(&alg_oid, &pk_alg) != 0) return (MBEDTLS_ERR_PK_UNKNOWN_PK_ALG); if ((ret = mbedtls_asn1_get_bitstring_null(&p, end, &len)) != 0) return (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret)); if (p + len != end) return (MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, MBEDTLS_ERR_ASN1_LENGTH_MISMATCH)); if ((pk_info = mbedtls_pk_info_from_type(pk_alg)) == NULL) return (MBEDTLS_ERR_PK_UNKNOWN_PK_ALG); if ((ret = mbedtls_pk_setup(ctx, pk_info)) != 0) return (ret); /* assume mbedtls_pk_parse_subpubkey(&der, der+der_len, ctx) * has already run with ctx initialized up to pk_get_ecpubkey(), * and pk_get_ecpubkey() has returned MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE * * mbedtls mbedtls_ecp_point_read_binary() * does not handle point in COMPRESSED format * * (validate assumption that algorithm is EC) */ mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*ctx); if (ecp_kp == NULL) return (MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE); mbedtls_ecp_group *ecp_kp_grp = &ecp_kp->MBEDTLS_PRIVATE(grp); mbedtls_ecp_point *ecp_kp_Q = &ecp_kp->MBEDTLS_PRIVATE(Q); mbedtls_ecp_group_id grp_id; /* mbedtls/library/pkparse.c:pk_use_ecparams() */ if (params.tag == MBEDTLS_ASN1_OID) { if (mbedtls_oid_get_ec_grp(¶ms, &grp_id) != 0) return (MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE); } else { return (MBEDTLS_ERR_PK_KEY_INVALID_FORMAT); } /* * grp may already be initialized; if so, make sure IDs match */ if (ecp_kp_grp->id != MBEDTLS_ECP_DP_NONE && ecp_kp_grp->id != grp_id) return (MBEDTLS_ERR_PK_KEY_INVALID_FORMAT); if ((ret = mbedtls_ecp_group_load(ecp_kp_grp, grp_id)) != 0) return (ret); /* (validate assumption that EC point is in COMPRESSED format) */ len = CRYPTO_EC_plen(ecp_kp_grp); if (mbedtls_ecp_get_type(ecp_kp_grp) != MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS || (end - p) != 1 + len || (*p != 0x02 && *p != 0x03)) return (MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE); /* Instead of calling mbedtls/library/pkparse.c:pk_get_ecpubkey() to call * mbedtls_ecp_point_read_binary(), manually parse point into ecp_kp_Q */ mbedtls_mpi *X = &ecp_kp_Q->MBEDTLS_PRIVATE(X); mbedtls_mpi *Y = &ecp_kp_Q->MBEDTLS_PRIVATE(Y); mbedtls_mpi *Z = &ecp_kp_Q->MBEDTLS_PRIVATE(Z); ret = mbedtls_mpi_lset(Z, 1); if (ret != 0) return (ret); ret = mbedtls_mpi_read_binary(X, p + 1, len); if (ret != 0) return (ret); /* derive Y * (similar derivation of Y in crypto_mbedtls.c:crypto_ecdh_set_peerkey())*/ ret = mbedtls_mpi_copy(Y, X) /*(Y is used as input and output obj below)*/ || crypto_mbedtls_short_weierstrass_derive_y(ecp_kp_grp, Y, (*p & 1)); if (ret != 0) return (ret); return mbedtls_ecp_check_pubkey(ecp_kp_grp, ecp_kp_Q); } struct crypto_ec_key *crypto_ec_key_parse_pub(const u8 *der, size_t der_len) { mbedtls_pk_context *ctx = os_malloc(sizeof(*ctx)); if (ctx == NULL) return NULL; mbedtls_pk_init(ctx); /*int rc = mbedtls_pk_parse_subpubkey(&der, der+der_len, ctx);*/ int rc = mbedtls_pk_parse_public_key(ctx, der, der_len); if (rc == 0) return (struct crypto_ec_key *)ctx; else if (rc == MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE) { /* mbedtls mbedtls_ecp_point_read_binary() * does not handle point in COMPRESSED format; parse internally */ rc = crypto_mbedtls_pk_parse_subpubkey_compressed(ctx, der, der_len); if (rc == 0) return (struct crypto_ec_key *)ctx; } mbedtls_pk_free(ctx); os_free(ctx); return NULL; } #ifdef CRYPTO_MBEDTLS_CRYPTO_EC_DPP static struct crypto_ec_key *crypto_ec_key_set_pub_point_for_group(mbedtls_ecp_group_id grp_id, const mbedtls_ecp_point *pub, const u8 *buf, size_t len) { const mbedtls_pk_info_t *pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY); if (pk_info == NULL) return NULL; mbedtls_pk_context *ctx = os_malloc(sizeof(*ctx)); if (ctx == NULL) return NULL; mbedtls_pk_init(ctx); if (mbedtls_pk_setup(ctx, pk_info) == 0) { /* (Is private key generation necessary for callers?) * alt: gen key then overwrite Q * mbedtls_ecp_gen_key(grp_id, ecp_kp, hostap_rng_fn, hostap_rng_ctx()) == 0 */ mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*ctx); mbedtls_ecp_group *ecp_kp_grp = &ecp_kp->MBEDTLS_PRIVATE(grp); mbedtls_ecp_point *ecp_kp_Q = &ecp_kp->MBEDTLS_PRIVATE(Q); mbedtls_mpi *ecp_kp_d = &ecp_kp->MBEDTLS_PRIVATE(d); if (mbedtls_ecp_group_load(ecp_kp_grp, grp_id) == 0 && (pub ? mbedtls_ecp_copy(ecp_kp_Q, pub) == 0 : mbedtls_ecp_point_read_binary(ecp_kp_grp, ecp_kp_Q, buf, len) == 0) && mbedtls_ecp_gen_privkey(ecp_kp_grp, ecp_kp_d, hostap_rng_fn, hostap_rng_ctx()) == 0) { return (struct crypto_ec_key *)ctx; } } mbedtls_pk_free(ctx); os_free(ctx); return NULL; } struct crypto_ec_key *crypto_ec_key_set_pub(int group, const u8 *x, const u8 *y, size_t len) { mbedtls_ecp_group_id grp_id = crypto_mbedtls_ecp_group_id_from_ike_id(group); if (grp_id == MBEDTLS_ECP_DP_NONE) return NULL; if (len > MBEDTLS_MPI_MAX_SIZE) return NULL; u8 buf[1 + MBEDTLS_MPI_MAX_SIZE * 2]; buf[0] = 0x04; /* assume x,y for Short Weierstrass */ os_memcpy(buf + 1, x, len); os_memcpy(buf + 1 + len, y, len); return crypto_ec_key_set_pub_point_for_group(grp_id, NULL, buf, 1 + len * 2); } struct crypto_ec_key *crypto_ec_key_set_pub_point(struct crypto_ec *e, const struct crypto_ec_point *pub) { mbedtls_ecp_group_id grp_id = ((mbedtls_ecp_group *)e)->id; mbedtls_ecp_point *p = (mbedtls_ecp_point *)pub; return crypto_ec_key_set_pub_point_for_group(grp_id, p, NULL, 0); } struct crypto_ec_key *crypto_ec_key_gen(int group) { mbedtls_pk_context *ctx = os_malloc(sizeof(*ctx)); if (ctx == NULL) return NULL; mbedtls_pk_init(ctx); if (crypto_mbedtls_keypair_gen(group, ctx) == 0) return (struct crypto_ec_key *)ctx; mbedtls_pk_free(ctx); os_free(ctx); return NULL; } #endif /* CRYPTO_MBEDTLS_CRYPTO_EC_DPP */ void crypto_ec_key_deinit(struct crypto_ec_key *key) { mbedtls_pk_free((mbedtls_pk_context *)key); os_free(key); } struct wpabuf *crypto_ec_key_get_subject_public_key(struct crypto_ec_key *key) { /* (similar to crypto_ec_key_get_pubkey_point(), * but compressed point format and ASN.1 DER wrapping)*/ #ifndef MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES /*(mbedtls/library/pkwrite.h)*/ #define MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES) #endif unsigned char buf[MBEDTLS_PK_ECP_PUB_DER_MAX_BYTES]; int len = mbedtls_pk_write_pubkey_der((mbedtls_pk_context *)key, buf, sizeof(buf)); if (len < 0) return NULL; /* Note: data is written at the end of the buffer! Use the * return value to determine where you should start * using the buffer */ unsigned char *p = buf + sizeof(buf) - len; #ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return NULL; mbedtls_ecp_group *grp = &ecp_kp->MBEDTLS_PRIVATE(grp); /* Note: sae_pk.c expects pubkey point in compressed format, * but mbedtls_pk_write_pubkey_der() writes uncompressed format. * Manually translate format and update lengths in DER format */ if (mbedtls_ecp_get_type(grp) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS) { unsigned char *end = buf + sizeof(buf); size_t n; /* SubjectPublicKeyInfo SEQUENCE */ mbedtls_asn1_get_tag(&p, end, &n, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); /* algorithm AlgorithmIdentifier */ unsigned char *a = p; size_t alen; mbedtls_asn1_get_tag(&p, end, &alen, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); p += alen; alen = (size_t)(p - a); /* subjectPublicKey BIT STRING */ mbedtls_asn1_get_tag(&p, end, &n, MBEDTLS_ASN1_BIT_STRING); /* rewrite into compressed point format and rebuild ASN.1 */ p[1] = (buf[sizeof(buf) - 1] & 1) ? 0x03 : 0x02; n = 1 + 1 + (n - 2) / 2; len = mbedtls_asn1_write_len(&p, buf, n) + (int)n; len += mbedtls_asn1_write_tag(&p, buf, MBEDTLS_ASN1_BIT_STRING); os_memmove(p - alen, a, alen); len += alen; p -= alen; len += mbedtls_asn1_write_len(&p, buf, (size_t)len); len += mbedtls_asn1_write_tag(&p, buf, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); } #endif return wpabuf_alloc_copy(p, (size_t)len); } #ifdef CRYPTO_MBEDTLS_CRYPTO_EC_DPP struct wpabuf *crypto_ec_key_get_ecprivate_key(struct crypto_ec_key *key, bool include_pub) { #ifndef MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES /*(mbedtls/library/pkwrite.h)*/ #define MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES (29 + 3 * MBEDTLS_ECP_MAX_BYTES) #endif unsigned char priv[MBEDTLS_PK_ECP_PRV_DER_MAX_BYTES]; int privlen = mbedtls_pk_write_key_der((mbedtls_pk_context *)key, priv, sizeof(priv)); if (privlen < 0) return NULL; struct wpabuf *wbuf; /* Note: data is written at the end of the buffer! Use the * return value to determine where you should start * using the buffer */ /* mbedtls_pk_write_key_der() includes publicKey in DER */ if (include_pub) wbuf = wpabuf_alloc_copy(priv + sizeof(priv) - privlen, privlen); else { /* calculate publicKey offset and skip from end of buffer */ unsigned char *p = priv + sizeof(priv) - privlen; unsigned char *end = priv + sizeof(priv); size_t len; /* ECPrivateKey SEQUENCE */ mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); /* version INTEGER */ unsigned char *v = p; mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_INTEGER); p += len; /* privateKey OCTET STRING */ mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_OCTET_STRING); p += len; /* parameters ECParameters */ mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED); p += len; /* write new SEQUENCE header (we know that it fits in priv[]) */ len = (size_t)(p - v); p = v; len += mbedtls_asn1_write_len(&p, priv, len); len += mbedtls_asn1_write_tag(&p, priv, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); wbuf = wpabuf_alloc_copy(p, len); } forced_memzero(priv, sizeof(priv)); return wbuf; } struct wpabuf *crypto_ec_key_get_pubkey_point(struct crypto_ec_key *key, int prefix) { /*(similarities to crypto_ecdh_get_pubkey(), but different struct)*/ mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return NULL; mbedtls_ecp_group *grp = &ecp_kp->MBEDTLS_PRIVATE(grp); size_t len = CRYPTO_EC_plen(grp); #ifdef MBEDTLS_ECP_MONTGOMERY_ENABLED /* len */ #endif #ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED if (mbedtls_ecp_get_type(grp) == MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS) len = len * 2 + 1; #endif struct wpabuf *buf = wpabuf_alloc(len); if (buf == NULL) return NULL; mbedtls_ecp_point *ecp_kp_Q = &ecp_kp->MBEDTLS_PRIVATE(Q); if (mbedtls_ecp_point_write_binary(grp, ecp_kp_Q, MBEDTLS_ECP_PF_UNCOMPRESSED, &len, wpabuf_mhead_u8(buf), len) == 0) { if (!prefix) /* Remove 0x04 prefix if requested */ os_memmove(wpabuf_mhead(buf), ((u8 *)wpabuf_mhead(buf) + 1), --len); wpabuf_put(buf, len); return buf; } wpabuf_free(buf); return NULL; } struct crypto_ec_point *crypto_ec_key_get_public_key(struct crypto_ec_key *key) { mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return NULL; mbedtls_ecp_point *p = os_malloc(sizeof(*p)); if (p != NULL) { /*(mbedtls_ecp_export() uses &ecp_kp->MBEDTLS_PRIVATE(grp))*/ mbedtls_ecp_point_init(p); mbedtls_ecp_point *ecp_kp_Q = &ecp_kp->MBEDTLS_PRIVATE(Q); if (mbedtls_ecp_copy(p, ecp_kp_Q)) { mbedtls_ecp_point_free(p); os_free(p); p = NULL; } } return (struct crypto_ec_point *)p; } struct crypto_bignum *crypto_ec_key_get_private_key(struct crypto_ec_key *key) { mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return NULL; mbedtls_mpi *bn = os_malloc(sizeof(*bn)); if (bn) { /*(mbedtls_ecp_export() uses &ecp_kp->MBEDTLS_PRIVATE(grp))*/ mbedtls_mpi_init(bn); mbedtls_mpi *ecp_kp_d = &ecp_kp->MBEDTLS_PRIVATE(d); if (mbedtls_mpi_copy(bn, ecp_kp_d)) { mbedtls_mpi_free(bn); os_free(bn); bn = NULL; } } return (struct crypto_bignum *)bn; } #endif /* CRYPTO_MBEDTLS_CRYPTO_EC_DPP */ static mbedtls_md_type_t crypto_ec_key_sign_md(size_t len) { /* get mbedtls_md_type_t from length of hash data to be signed */ switch (len) { case 64: return MBEDTLS_MD_SHA512; case 48: return MBEDTLS_MD_SHA384; case 32: return MBEDTLS_MD_SHA256; case 20: return MBEDTLS_MD_SHA1; case 16: return MBEDTLS_MD_MD5; default: return MBEDTLS_MD_NONE; } } struct wpabuf *crypto_ec_key_sign(struct crypto_ec_key *key, const u8 *data, size_t len) { #ifndef MBEDTLS_PK_SIGNATURE_MAX_SIZE /*(defined since mbedtls 2.20.0)*/ #if MBEDTLS_ECDSA_MAX_LEN > MBEDTLS_MPI_MAX_SIZE #define MBEDTLS_PK_SIGNATURE_MAX_SIZE MBEDTLS_ECDSA_MAX_LEN #else #define MBEDTLS_PK_SIGNATURE_MAX_SIZE MBEDTLS_MPI_MAX_SIZE #endif #endif size_t sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE; struct wpabuf *buf = wpabuf_alloc(sig_len); if (buf == NULL) return NULL; if (mbedtls_pk_sign((mbedtls_pk_context *)key, crypto_ec_key_sign_md(len), data, len, wpabuf_mhead_u8(buf), #if MBEDTLS_VERSION_NUMBER >= 0x03000000 /* mbedtls 3.0.0 */ sig_len, #endif &sig_len, hostap_rng_fn, hostap_rng_ctx()) == 0) { wpabuf_put(buf, sig_len); return buf; } wpabuf_free(buf); return NULL; } #ifdef CRYPTO_MBEDTLS_CRYPTO_EC_DPP struct wpabuf *crypto_ec_key_sign_r_s(struct crypto_ec_key *key, const u8 *data, size_t len) { mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return NULL; size_t sig_len = MBEDTLS_ECDSA_MAX_LEN; u8 buf[MBEDTLS_ECDSA_MAX_LEN]; if (mbedtls_ecdsa_write_signature(ecp_kp, crypto_ec_key_sign_md(len), data, len, buf, #if MBEDTLS_VERSION_NUMBER >= 0x03000000 /* mbedtls 3.0.0 */ sig_len, #endif &sig_len, hostap_rng_fn, hostap_rng_ctx())) { return NULL; } /*(mbedtls_ecdsa_write_signature() writes signature in ASN.1)*/ /* parse ASN.1 to get r and s and lengths */ u8 *p = buf, *r, *s; u8 *end = p + sig_len; size_t rlen, slen; mbedtls_asn1_get_tag(&p, end, &rlen, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); mbedtls_asn1_get_tag(&p, end, &rlen, MBEDTLS_ASN1_INTEGER); r = p; p += rlen; mbedtls_asn1_get_tag(&p, end, &slen, MBEDTLS_ASN1_INTEGER); s = p; /* write raw r and s into out * (including removal of leading 0 if added for ASN.1 integer) * note: DPP caller expects raw r, s each padded to prime len */ mbedtls_ecp_group *ecp_kp_grp = &ecp_kp->MBEDTLS_PRIVATE(grp); size_t plen = CRYPTO_EC_plen(ecp_kp_grp); if (rlen > plen) { r += (rlen - plen); rlen = plen; } if (slen > plen) { s += (slen - plen); slen = plen; } struct wpabuf *out = wpabuf_alloc(plen * 2); if (out) { wpabuf_put(out, plen * 2); p = wpabuf_mhead_u8(out); os_memset(p, 0, plen * 2); os_memcpy(p + plen * 1 - rlen, r, rlen); os_memcpy(p + plen * 2 - slen, s, slen); } return out; } #endif /* CRYPTO_MBEDTLS_CRYPTO_EC_DPP */ int crypto_ec_key_verify_signature(struct crypto_ec_key *key, const u8 *data, size_t len, const u8 *sig, size_t sig_len) { switch (mbedtls_pk_verify((mbedtls_pk_context *)key, crypto_ec_key_sign_md(len), data, len, sig, sig_len)) { case 0: /*case MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH:*/ /* XXX: allow? */ return 1; case MBEDTLS_ERR_ECP_VERIFY_FAILED: return 0; default: return -1; } } #ifdef CRYPTO_MBEDTLS_CRYPTO_EC_DPP int crypto_ec_key_verify_signature_r_s( struct crypto_ec_key *key, const u8 *data, size_t len, const u8 *r, size_t r_len, const u8 *s, size_t s_len) { /* reimplement mbedtls_ecdsa_read_signature() without encoding r and s * into ASN.1 just for mbedtls_ecdsa_read_signature() to decode ASN.1 */ mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return -1; mbedtls_ecp_group *ecp_kp_grp = &ecp_kp->MBEDTLS_PRIVATE(grp); mbedtls_ecp_point *ecp_kp_Q = &ecp_kp->MBEDTLS_PRIVATE(Q); mbedtls_mpi mpi_r; mbedtls_mpi mpi_s; mbedtls_mpi_init(&mpi_r); mbedtls_mpi_init(&mpi_s); int ret = mbedtls_mpi_read_binary(&mpi_r, r, r_len) || mbedtls_mpi_read_binary(&mpi_s, s, s_len) ? -1 : 0; if (ret == 0) { ret = mbedtls_ecdsa_verify(ecp_kp_grp, data, len, ecp_kp_Q, &mpi_r, &mpi_s); ret = ret ? ret == MBEDTLS_ERR_ECP_BAD_INPUT_DATA ? 0 : -1 : 1; } mbedtls_mpi_free(&mpi_r); mbedtls_mpi_free(&mpi_s); return ret; } #endif /* CRYPTO_MBEDTLS_CRYPTO_EC_DPP */ int crypto_ec_key_group(struct crypto_ec_key *key) { mbedtls_ecp_keypair *ecp_kp = mbedtls_pk_ec(*(mbedtls_pk_context *)key); if (ecp_kp == NULL) return -1; mbedtls_ecp_group *ecp_group = &ecp_kp->MBEDTLS_PRIVATE(grp); return crypto_mbedtls_ike_id_from_ecp_group_id(ecp_group->id); } #ifdef CRYPTO_MBEDTLS_CRYPTO_EC_DPP int crypto_ec_key_cmp(struct crypto_ec_key *key1, struct crypto_ec_key *key2) { mbedtls_ecp_keypair *ecp_kp1 = mbedtls_pk_ec(*(mbedtls_pk_context *)key1); mbedtls_ecp_keypair *ecp_kp2 = mbedtls_pk_ec(*(mbedtls_pk_context *)key2); if (ecp_kp1 == NULL || ecp_kp2 == NULL) return -1; mbedtls_ecp_group *ecp_kp1_grp = &ecp_kp1->MBEDTLS_PRIVATE(grp); mbedtls_ecp_group *ecp_kp2_grp = &ecp_kp2->MBEDTLS_PRIVATE(grp); mbedtls_ecp_point *ecp_kp1_Q = &ecp_kp1->MBEDTLS_PRIVATE(Q); mbedtls_ecp_point *ecp_kp2_Q = &ecp_kp2->MBEDTLS_PRIVATE(Q); return ecp_kp1_grp->id != ecp_kp2_grp->id || mbedtls_ecp_point_cmp(ecp_kp1_Q, ecp_kp2_Q) ? -1 : 0; } void crypto_ec_key_debug_print(const struct crypto_ec_key *key, const char *title) { /* TBD: what info is desirable here and in what human readable format?*/ /*(crypto_openssl.c prints a human-readably public key and attributes)*/ wpa_printf(MSG_DEBUG, "%s: %s not implemented", title, __func__); } #endif /* CRYPTO_MBEDTLS_CRYPTO_EC_DPP */ #endif /* CRYPTO_MBEDTLS_CRYPTO_EC */ #ifdef CRYPTO_MBEDTLS_CRYPTO_CSR #include #include struct crypto_csr *crypto_csr_init(void) { mbedtls_x509write_csr *csr = os_malloc(sizeof(*csr)); if (csr != NULL) mbedtls_x509write_csr_init(csr); return (struct crypto_csr *)csr; } struct crypto_csr *crypto_csr_verify(const struct wpabuf *req) { /* future: look for alternatives to MBEDTLS_PRIVATE() access */ /* sole caller src/common/dpp_crypto.c:dpp_validate_csr() * uses (mbedtls_x509_csr *) to obtain CSR_ATTR_CHALLENGE_PASSWORD * so allocate different object (mbedtls_x509_csr *) and special-case * object when used in crypto_csr_get_attribute() and when free()d in * crypto_csr_deinit(). */ mbedtls_x509_csr *csr = os_malloc(sizeof(*csr)); if (csr == NULL) return NULL; mbedtls_x509_csr_init(csr); const mbedtls_md_info_t *md_info; unsigned char digest[MBEDTLS_MD_MAX_SIZE]; if (mbedtls_x509_csr_parse_der(csr, wpabuf_head(req), wpabuf_len(req)) == 0 && (md_info = mbedtls_md_info_from_type(csr->MBEDTLS_PRIVATE(sig_md))) != NULL && mbedtls_md(md_info, csr->cri.p, csr->cri.len, digest) == 0) { switch (mbedtls_pk_verify(&csr->pk, csr->MBEDTLS_PRIVATE(sig_md), digest, mbedtls_md_get_size(md_info), csr->MBEDTLS_PRIVATE(sig).p, csr->MBEDTLS_PRIVATE(sig).len)) { case 0: /*case MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH:*/ /* XXX: allow? */ return (struct crypto_csr *)((uintptr_t)csr | 1uL); default: break; } } mbedtls_x509_csr_free(csr); os_free(csr); return NULL; } void crypto_csr_deinit(struct crypto_csr *csr) { if ((uintptr_t)csr & 1uL) { csr = (struct crypto_csr *)((uintptr_t)csr & ~1uL); mbedtls_x509_csr_free((mbedtls_x509_csr *)csr); } else mbedtls_x509write_csr_free((mbedtls_x509write_csr *)csr); os_free(csr); } int crypto_csr_set_ec_public_key(struct crypto_csr *csr, struct crypto_ec_key *key) { mbedtls_x509write_csr_set_key((mbedtls_x509write_csr *)csr, (mbedtls_pk_context *)key); return 0; } int crypto_csr_set_name(struct crypto_csr *csr, enum crypto_csr_name type, const char *name) { /* specialized for src/common/dpp_crypto.c */ /* sole caller src/common/dpp_crypto.c:dpp_build_csr() * calls this function only once, using type == CSR_NAME_CN * (If called more than once, this code would need to append * components to the subject name, which we could do by * appending to (mbedtls_x509write_csr *) private member * mbedtls_asn1_named_data *MBEDTLS_PRIVATE(subject)) */ const char *label; switch (type) { case CSR_NAME_CN: label = "CN="; break; case CSR_NAME_SN: label = "SN="; break; case CSR_NAME_C: label = "C="; break; case CSR_NAME_O: label = "O="; break; case CSR_NAME_OU: label = "OU="; break; default: return -1; } size_t len = strlen(name); struct wpabuf *buf = wpabuf_alloc(3 + len + 1); if (buf == NULL) return -1; wpabuf_put_data(buf, label, strlen(label)); wpabuf_put_data(buf, name, len + 1); /*(include trailing '\0')*/ /* Note: 'name' provided is set as given and should be backslash-escaped * by caller when necessary, e.g. literal ',' which are not separating * components should be backslash-escaped */ int ret = mbedtls_x509write_csr_set_subject_name((mbedtls_x509write_csr *)csr, wpabuf_head(buf)) ? -1 : 0; wpabuf_free(buf); return ret; } /* OBJ_pkcs9_challengePassword 1 2 840 113549 1 9 7 */ static const char OBJ_pkcs9_challengePassword[] = MBEDTLS_OID_PKCS9 "\x07"; int crypto_csr_set_attribute( struct crypto_csr *csr, enum crypto_csr_attr attr, int attr_type, const u8 *value, size_t len) { /* specialized for src/common/dpp_crypto.c */ /* sole caller src/common/dpp_crypto.c:dpp_build_csr() passes * attr == CSR_ATTR_CHALLENGE_PASSWORD * attr_type == ASN1_TAG_UTF8STRING */ const char *oid; size_t oid_len; switch (attr) { case CSR_ATTR_CHALLENGE_PASSWORD: oid = OBJ_pkcs9_challengePassword; oid_len = sizeof(OBJ_pkcs9_challengePassword) - 1; break; default: return -1; } (void)oid; (void)oid_len; /* mbedtls does not currently provide way to set an attribute in a CSR: * https://github.com/Mbed-TLS/mbedtls/issues/4886 */ wpa_printf(MSG_ERROR, "mbedtls does not currently support setting challengePassword " "attribute in CSR"); return -1; } const u8 *mbedtls_x509_csr_attr_oid_value( mbedtls_x509_csr *csr, const char *oid, size_t oid_len, size_t *vlen, int *vtype) { /* Note: mbedtls_x509_csr_parse_der() has parsed and validated CSR, * so validation checks are not repeated here * * It would be nicer if (mbedtls_x509_csr *) had an mbedtls_x509_buf of * Attributes (or at least a pointer) since mbedtls_x509_csr_parse_der() * already parsed the rest of CertificationRequestInfo, some of which is * repeated here to step to Attributes. Since csr->subject_raw.p points * into csr->cri.p, which points into csr->raw.p, step over version and * subject of CertificationRequestInfo (SEQUENCE) */ unsigned char *p = csr->subject_raw.p + csr->subject_raw.len; unsigned char *end = csr->cri.p + csr->cri.len, *ext; size_t len; /* step over SubjectPublicKeyInfo */ mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE); p += len; /* Attributes * { ATTRIBUTE:IOSet } ::= SET OF { SEQUENCE { OID, value } } */ if (mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC) != 0) { return NULL; } while (p < end) { if (mbedtls_asn1_get_tag(&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE) != 0) { return NULL; } ext = p; p += len; if (mbedtls_asn1_get_tag(&ext, end, &len, MBEDTLS_ASN1_OID) != 0) return NULL; if (oid_len != len || 0 != memcmp(ext, oid, oid_len)) continue; /* found oid; return value */ *vtype = *ext++; /* tag */ return (mbedtls_asn1_get_len(&ext, end, vlen) == 0) ? ext : NULL; } return NULL; } const u8 *crypto_csr_get_attribute(struct crypto_csr *csr, enum crypto_csr_attr attr, size_t *len, int *type) { /* specialized for src/common/dpp_crypto.c */ /* sole caller src/common/dpp_crypto.c:dpp_build_csr() passes * attr == CSR_ATTR_CHALLENGE_PASSWORD */ const char *oid; size_t oid_len; switch (attr) { case CSR_ATTR_CHALLENGE_PASSWORD: oid = OBJ_pkcs9_challengePassword; oid_len = sizeof(OBJ_pkcs9_challengePassword) - 1; break; default: return NULL; } /* see crypto_csr_verify(); expecting (mbedtls_x509_csr *) tagged |=1 */ if (!((uintptr_t)csr & 1uL)) return NULL; csr = (struct crypto_csr *)((uintptr_t)csr & ~1uL); return mbedtls_x509_csr_attr_oid_value((mbedtls_x509_csr *)csr, oid, oid_len, len, type); } struct wpabuf *crypto_csr_sign(struct crypto_csr *csr, struct crypto_ec_key *key, enum crypto_hash_alg algo) { mbedtls_md_type_t sig_md; switch (algo) { case CRYPTO_HASH_ALG_SHA256: sig_md = MBEDTLS_MD_SHA256; break; case CRYPTO_HASH_ALG_SHA384: sig_md = MBEDTLS_MD_SHA384; break; case CRYPTO_HASH_ALG_SHA512: sig_md = MBEDTLS_MD_SHA512; break; default: return NULL; } mbedtls_x509write_csr_set_md_alg((mbedtls_x509write_csr *)csr, sig_md); unsigned char buf[4096]; /* XXX: large enough? too large? */ int len = mbedtls_x509write_csr_der((mbedtls_x509write_csr *)csr, buf, sizeof(buf), hostap_rng_fn, hostap_rng_ctx()); if (len < 0) return NULL; /* Note: data is written at the end of the buffer! Use the * return value to determine where you should start * using the buffer */ return wpabuf_alloc_copy(buf + sizeof(buf) - len, (size_t)len); } #endif /* CRYPTO_MBEDTLS_CRYPTO_CSR */ #ifdef CRYPTO_MBEDTLS_CRYPTO_PKCS7 struct wpabuf *crypto_pkcs7_get_certificates(const struct wpabuf *pkcs7) { return NULL; } #endif /* CRYPTO_MBEDTLS_CRYPTO_PKCS7 */ #endif