1 /*
2 * RSASSA-PSS/SHA-256 signature creation program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 */
7
8 #define MBEDTLS_DECLARE_PRIVATE_IDENTIFIERS
9
10 #include "tf-psa-crypto/build_info.h"
11
12 #include "mbedtls/platform.h"
13 /* md.h is included this early since MD_CAN_XXX macros are defined there. */
14 #include "mbedtls/md.h"
15
16 #if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
17 !defined(MBEDTLS_RSA_C) || !defined(PSA_WANT_ALG_SHA_256) || \
18 !defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
19 !defined(MBEDTLS_CTR_DRBG_C)
main(void)20 int main(void)
21 {
22 mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_ENTROPY_C and/or "
23 "MBEDTLS_RSA_C and/or PSA_WANT_ALG_SHA_256 and/or "
24 "MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
25 "MBEDTLS_CTR_DRBG_C not defined.\n");
26 mbedtls_exit(0);
27 }
28 #else
29
30 #include "mbedtls/entropy.h"
31 #include "mbedtls/ctr_drbg.h"
32 #include "mbedtls/rsa.h"
33 #include "mbedtls/pk.h"
34 #if defined(MBEDTLS_PK_HAVE_PRIVATE_HEADER)
35 #include <mbedtls/private/pk_private.h>
36 #endif /* MBEDTLS_PK_HAVE_PRIVATE_HEADER */
37
38 #include <stdio.h>
39 #include <string.h>
40
41
main(int argc,char * argv[])42 int main(int argc, char *argv[])
43 {
44 FILE *f;
45 int ret = 1;
46 int exit_code = MBEDTLS_EXIT_FAILURE;
47 mbedtls_pk_context pk;
48 mbedtls_entropy_context entropy;
49 mbedtls_ctr_drbg_context ctr_drbg;
50 unsigned char hash[32];
51 unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
52 char filename[512];
53 const char *pers = "rsa_sign_pss";
54 size_t olen = 0;
55
56 mbedtls_entropy_init(&entropy);
57 mbedtls_pk_init(&pk);
58 mbedtls_ctr_drbg_init(&ctr_drbg);
59
60 psa_status_t status = psa_crypto_init();
61 if (status != PSA_SUCCESS) {
62 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
63 (int) status);
64 goto exit;
65 }
66
67 if (argc != 3) {
68 mbedtls_printf("usage: rsa_sign_pss <key_file> <filename>\n");
69
70 #if defined(_WIN32)
71 mbedtls_printf("\n");
72 #endif
73
74 goto exit;
75 }
76
77 mbedtls_printf("\n . Seeding the random number generator...");
78 fflush(stdout);
79
80 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
81 (const unsigned char *) pers,
82 strlen(pers))) != 0) {
83 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret);
84 goto exit;
85 }
86
87 mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
88 fflush(stdout);
89
90 if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "")) != 0) {
91 mbedtls_printf(" failed\n ! Could not read key from '%s'\n", argv[1]);
92 mbedtls_printf(" ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret);
93 goto exit;
94 }
95
96 if (!mbedtls_pk_can_do(&pk, MBEDTLS_PK_RSA)) {
97 mbedtls_printf(" failed\n ! Key is not an RSA key\n");
98 goto exit;
99 }
100
101 if ((ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk),
102 MBEDTLS_RSA_PKCS_V21,
103 MBEDTLS_MD_SHA256)) != 0) {
104 mbedtls_printf(" failed\n ! Padding not supported\n");
105 goto exit;
106 }
107
108 /*
109 * Compute the SHA-256 hash of the input file,
110 * then calculate the RSA signature of the hash.
111 */
112 mbedtls_printf("\n . Generating the RSA/SHA-256 signature");
113 fflush(stdout);
114
115 if ((ret = mbedtls_md_file(
116 mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
117 argv[2], hash)) != 0) {
118 mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
119 goto exit;
120 }
121
122 if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
123 buf, sizeof(buf), &olen)) != 0) {
124 mbedtls_printf(" failed\n ! mbedtls_pk_sign returned %d\n\n", ret);
125 goto exit;
126 }
127
128 /*
129 * Write the signature into <filename>.sig
130 */
131 mbedtls_snprintf(filename, 512, "%s.sig", argv[2]);
132
133 if ((f = fopen(filename, "wb+")) == NULL) {
134 mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
135 goto exit;
136 }
137
138 if (fwrite(buf, 1, olen, f) != olen) {
139 mbedtls_printf("failed\n ! fwrite failed\n\n");
140 fclose(f);
141 goto exit;
142 }
143
144 fclose(f);
145
146 mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
147
148 exit_code = MBEDTLS_EXIT_SUCCESS;
149
150 exit:
151 mbedtls_pk_free(&pk);
152 mbedtls_ctr_drbg_free(&ctr_drbg);
153 mbedtls_entropy_free(&entropy);
154 mbedtls_psa_crypto_free();
155
156 mbedtls_exit(exit_code);
157 }
158 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
159 PSA_WANT_ALG_SHA_256 && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
160 MBEDTLS_CTR_DRBG_C */
161