1 /*
2 * RSASSA-PSS/SHA-256 signature verification program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 */
7
8 #include "mbedtls/build_info.h"
9
10 #include "mbedtls/platform.h"
11 /* md.h is included this early since MD_CAN_XXX macros are defined there. */
12 #include "mbedtls/md.h"
13
14 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
15 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_MD_CAN_SHA256) || \
16 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
17 !defined(MBEDTLS_CTR_DRBG_C)
main(void)18 int main(void)
19 {
20 mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_ENTROPY_C and/or "
21 "MBEDTLS_RSA_C and/or MBEDTLS_MD_CAN_SHA256 and/or "
22 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
23 "MBEDTLS_CTR_DRBG_C not defined.\n");
24 mbedtls_exit(0);
25 }
26 #else
27
28 #include "mbedtls/md.h"
29 #include "mbedtls/pem.h"
30 #include "mbedtls/pk.h"
31
32 #include <stdio.h>
33 #include <string.h>
34
35
main(int argc,char * argv[])36 int main(int argc, char *argv[])
37 {
38 FILE *f;
39 int ret = 1;
40 int exit_code = MBEDTLS_EXIT_FAILURE;
41 size_t i;
42 mbedtls_pk_context pk;
43 unsigned char hash[32];
44 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
45 char filename[512];
46
47 mbedtls_pk_init(&pk);
48
49 #if defined(MBEDTLS_USE_PSA_CRYPTO)
50 psa_status_t status = psa_crypto_init();
51 if (status != PSA_SUCCESS) {
52 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
53 (int) status);
54 goto exit;
55 }
56 #endif /* MBEDTLS_USE_PSA_CRYPTO */
57
58 if (argc != 3) {
59 mbedtls_printf("usage: rsa_verify_pss <key_file> <filename>\n");
60
61 #if defined(_WIN32)
62 mbedtls_printf("\n");
63 #endif
64
65 goto exit;
66 }
67
68 mbedtls_printf("\n . Reading public key from '%s'", argv[1]);
69 fflush(stdout);
70
71 if ((ret = mbedtls_pk_parse_public_keyfile(&pk, argv[1])) != 0) {
72 mbedtls_printf(" failed\n ! Could not read key from '%s'\n", argv[1]);
73 mbedtls_printf(" ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret);
74 goto exit;
75 }
76
77 if (!mbedtls_pk_can_do(&pk, MBEDTLS_PK_RSA)) {
78 mbedtls_printf(" failed\n ! Key is not an RSA key\n");
79 goto exit;
80 }
81
82 if ((ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk),
83 MBEDTLS_RSA_PKCS_V21,
84 MBEDTLS_MD_SHA256)) != 0) {
85 mbedtls_printf(" failed\n ! Invalid padding\n");
86 goto exit;
87 }
88
89 /*
90 * Extract the RSA signature from the file
91 */
92 mbedtls_snprintf(filename, 512, "%s.sig", argv[2]);
93
94 if ((f = fopen(filename, "rb")) == NULL) {
95 mbedtls_printf("\n ! Could not open %s\n\n", filename);
96 goto exit;
97 }
98
99 i = fread(buf, 1, MBEDTLS_MPI_MAX_SIZE, f);
100
101 fclose(f);
102
103 /*
104 * Compute the SHA-256 hash of the input file and
105 * verify the signature
106 */
107 mbedtls_printf("\n . Verifying the RSA/SHA-256 signature");
108 fflush(stdout);
109
110 if ((ret = mbedtls_md_file(
111 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
112 argv[2], hash)) != 0) {
113 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
114 goto exit;
115 }
116
117 if ((ret = mbedtls_pk_verify(&pk, MBEDTLS_MD_SHA256, hash, 0,
118 buf, i)) != 0) {
119 mbedtls_printf(" failed\n ! mbedtls_pk_verify returned %d\n\n", ret);
120 goto exit;
121 }
122
123 mbedtls_printf("\n . OK (the signature is valid)\n\n");
124
125 exit_code = MBEDTLS_EXIT_SUCCESS;
126
127 exit:
128 mbedtls_pk_free(&pk);
129 #if defined(MBEDTLS_USE_PSA_CRYPTO)
130 mbedtls_psa_crypto_free();
131 #endif /* MBEDTLS_USE_PSA_CRYPTO */
132
133 mbedtls_exit(exit_code);
134 }
135 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA256 &&
136 MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
137
