1 /**
2 * \file block_cipher.c
3 *
4 * \brief Lightweight abstraction layer for block ciphers with 128 bit blocks,
5 * for use by the GCM and CCM modules.
6 */
7 /*
8 * Copyright The Mbed TLS Contributors
9 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
10 */
11
12 #include "common.h"
13
14 #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
15 #include "psa/crypto.h"
16 #include "psa_crypto_core.h"
17 #include "psa_util_internal.h"
18 #endif
19
20 #include "block_cipher_internal.h"
21
22 #if defined(MBEDTLS_BLOCK_CIPHER_C)
23
24 #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
psa_key_type_from_block_cipher_id(mbedtls_block_cipher_id_t cipher_id)25 static psa_key_type_t psa_key_type_from_block_cipher_id(mbedtls_block_cipher_id_t cipher_id)
26 {
27 switch (cipher_id) {
28 #if defined(MBEDTLS_BLOCK_CIPHER_AES_VIA_PSA)
29 case MBEDTLS_BLOCK_CIPHER_ID_AES:
30 return PSA_KEY_TYPE_AES;
31 #endif
32 #if defined(MBEDTLS_BLOCK_CIPHER_ARIA_VIA_PSA)
33 case MBEDTLS_BLOCK_CIPHER_ID_ARIA:
34 return PSA_KEY_TYPE_ARIA;
35 #endif
36 #if defined(MBEDTLS_BLOCK_CIPHER_CAMELLIA_VIA_PSA)
37 case MBEDTLS_BLOCK_CIPHER_ID_CAMELLIA:
38 return PSA_KEY_TYPE_CAMELLIA;
39 #endif
40 default:
41 return PSA_KEY_TYPE_NONE;
42 }
43 }
44
mbedtls_cipher_error_from_psa(psa_status_t status)45 static int mbedtls_cipher_error_from_psa(psa_status_t status)
46 {
47 return PSA_TO_MBEDTLS_ERR_LIST(status, psa_to_cipher_errors,
48 psa_generic_status_to_mbedtls);
49 }
50 #endif /* MBEDTLS_BLOCK_CIPHER_SOME_PSA */
51
mbedtls_block_cipher_free(mbedtls_block_cipher_context_t * ctx)52 void mbedtls_block_cipher_free(mbedtls_block_cipher_context_t *ctx)
53 {
54 if (ctx == NULL) {
55 return;
56 }
57
58 #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
59 if (ctx->engine == MBEDTLS_BLOCK_CIPHER_ENGINE_PSA) {
60 psa_destroy_key(ctx->psa_key_id);
61 return;
62 }
63 #endif
64 switch (ctx->id) {
65 #if defined(MBEDTLS_AES_C)
66 case MBEDTLS_BLOCK_CIPHER_ID_AES:
67 mbedtls_aes_free(&ctx->ctx.aes);
68 break;
69 #endif
70 #if defined(MBEDTLS_ARIA_C)
71 case MBEDTLS_BLOCK_CIPHER_ID_ARIA:
72 mbedtls_aria_free(&ctx->ctx.aria);
73 break;
74 #endif
75 #if defined(MBEDTLS_CAMELLIA_C)
76 case MBEDTLS_BLOCK_CIPHER_ID_CAMELLIA:
77 mbedtls_camellia_free(&ctx->ctx.camellia);
78 break;
79 #endif
80 default:
81 break;
82 }
83 ctx->id = MBEDTLS_BLOCK_CIPHER_ID_NONE;
84 }
85
mbedtls_block_cipher_setup(mbedtls_block_cipher_context_t * ctx,mbedtls_cipher_id_t cipher_id)86 int mbedtls_block_cipher_setup(mbedtls_block_cipher_context_t *ctx,
87 mbedtls_cipher_id_t cipher_id)
88 {
89 ctx->id = (cipher_id == MBEDTLS_CIPHER_ID_AES) ? MBEDTLS_BLOCK_CIPHER_ID_AES :
90 (cipher_id == MBEDTLS_CIPHER_ID_ARIA) ? MBEDTLS_BLOCK_CIPHER_ID_ARIA :
91 (cipher_id == MBEDTLS_CIPHER_ID_CAMELLIA) ? MBEDTLS_BLOCK_CIPHER_ID_CAMELLIA :
92 MBEDTLS_BLOCK_CIPHER_ID_NONE;
93
94 #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
95 psa_key_type_t psa_key_type = psa_key_type_from_block_cipher_id(ctx->id);
96 if (psa_key_type != PSA_KEY_TYPE_NONE &&
97 psa_can_do_cipher(psa_key_type, PSA_ALG_ECB_NO_PADDING)) {
98 ctx->engine = MBEDTLS_BLOCK_CIPHER_ENGINE_PSA;
99 return 0;
100 }
101 ctx->engine = MBEDTLS_BLOCK_CIPHER_ENGINE_LEGACY;
102 #endif
103
104 switch (ctx->id) {
105 #if defined(MBEDTLS_AES_C)
106 case MBEDTLS_BLOCK_CIPHER_ID_AES:
107 mbedtls_aes_init(&ctx->ctx.aes);
108 return 0;
109 #endif
110 #if defined(MBEDTLS_ARIA_C)
111 case MBEDTLS_BLOCK_CIPHER_ID_ARIA:
112 mbedtls_aria_init(&ctx->ctx.aria);
113 return 0;
114 #endif
115 #if defined(MBEDTLS_CAMELLIA_C)
116 case MBEDTLS_BLOCK_CIPHER_ID_CAMELLIA:
117 mbedtls_camellia_init(&ctx->ctx.camellia);
118 return 0;
119 #endif
120 default:
121 ctx->id = MBEDTLS_BLOCK_CIPHER_ID_NONE;
122 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
123 }
124 }
125
mbedtls_block_cipher_setkey(mbedtls_block_cipher_context_t * ctx,const unsigned char * key,unsigned key_bitlen)126 int mbedtls_block_cipher_setkey(mbedtls_block_cipher_context_t *ctx,
127 const unsigned char *key,
128 unsigned key_bitlen)
129 {
130 #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
131 if (ctx->engine == MBEDTLS_BLOCK_CIPHER_ENGINE_PSA) {
132 psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
133 psa_status_t status;
134
135 psa_set_key_type(&key_attr, psa_key_type_from_block_cipher_id(ctx->id));
136 psa_set_key_bits(&key_attr, key_bitlen);
137 psa_set_key_algorithm(&key_attr, PSA_ALG_ECB_NO_PADDING);
138 psa_set_key_usage_flags(&key_attr, PSA_KEY_USAGE_ENCRYPT);
139
140 status = psa_import_key(&key_attr, key, PSA_BITS_TO_BYTES(key_bitlen), &ctx->psa_key_id);
141 if (status != PSA_SUCCESS) {
142 return mbedtls_cipher_error_from_psa(status);
143 }
144 psa_reset_key_attributes(&key_attr);
145
146 return 0;
147 }
148 #endif /* MBEDTLS_BLOCK_CIPHER_SOME_PSA */
149
150 switch (ctx->id) {
151 #if defined(MBEDTLS_AES_C)
152 case MBEDTLS_BLOCK_CIPHER_ID_AES:
153 return mbedtls_aes_setkey_enc(&ctx->ctx.aes, key, key_bitlen);
154 #endif
155 #if defined(MBEDTLS_ARIA_C)
156 case MBEDTLS_BLOCK_CIPHER_ID_ARIA:
157 return mbedtls_aria_setkey_enc(&ctx->ctx.aria, key, key_bitlen);
158 #endif
159 #if defined(MBEDTLS_CAMELLIA_C)
160 case MBEDTLS_BLOCK_CIPHER_ID_CAMELLIA:
161 return mbedtls_camellia_setkey_enc(&ctx->ctx.camellia, key, key_bitlen);
162 #endif
163 default:
164 return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
165 }
166 }
167
mbedtls_block_cipher_encrypt(mbedtls_block_cipher_context_t * ctx,const unsigned char input[16],unsigned char output[16])168 int mbedtls_block_cipher_encrypt(mbedtls_block_cipher_context_t *ctx,
169 const unsigned char input[16],
170 unsigned char output[16])
171 {
172 #if defined(MBEDTLS_BLOCK_CIPHER_SOME_PSA)
173 if (ctx->engine == MBEDTLS_BLOCK_CIPHER_ENGINE_PSA) {
174 psa_status_t status;
175 size_t olen;
176
177 status = psa_cipher_encrypt(ctx->psa_key_id, PSA_ALG_ECB_NO_PADDING,
178 input, 16, output, 16, &olen);
179 if (status != PSA_SUCCESS) {
180 return mbedtls_cipher_error_from_psa(status);
181 }
182 return 0;
183 }
184 #endif /* MBEDTLS_BLOCK_CIPHER_SOME_PSA */
185
186 switch (ctx->id) {
187 #if defined(MBEDTLS_AES_C)
188 case MBEDTLS_BLOCK_CIPHER_ID_AES:
189 return mbedtls_aes_crypt_ecb(&ctx->ctx.aes, MBEDTLS_AES_ENCRYPT,
190 input, output);
191 #endif
192 #if defined(MBEDTLS_ARIA_C)
193 case MBEDTLS_BLOCK_CIPHER_ID_ARIA:
194 return mbedtls_aria_crypt_ecb(&ctx->ctx.aria, input, output);
195 #endif
196 #if defined(MBEDTLS_CAMELLIA_C)
197 case MBEDTLS_BLOCK_CIPHER_ID_CAMELLIA:
198 return mbedtls_camellia_crypt_ecb(&ctx->ctx.camellia,
199 MBEDTLS_CAMELLIA_ENCRYPT,
200 input, output);
201 #endif
202 default:
203 return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
204 }
205 }
206
207 #endif /* MBEDTLS_BLOCK_CIPHER_C */
208