155 lines
4.6 KiB
C
155 lines
4.6 KiB
C
/*
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* Public key-based signature creation program
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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#include "mbedtls/build_info.h"
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#include "mbedtls/platform.h"
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/* md.h is included this early since MD_CAN_XXX macros are defined there. */
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#include "mbedtls/md.h"
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_MD_C) || \
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!defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
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!defined(MBEDTLS_CTR_DRBG_C)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_MD_C and/or "
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"MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
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"MBEDTLS_CTR_DRBG_C not defined.\n");
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mbedtls_exit(0);
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}
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#else
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#include "mbedtls/error.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/pk.h"
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char *argv[])
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{
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FILE *f;
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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mbedtls_pk_context pk;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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unsigned char hash[32];
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unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
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char filename[512];
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const char *pers = "mbedtls_pk_sign";
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size_t olen = 0;
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mbedtls_entropy_init(&entropy);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_pk_init(&pk);
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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psa_status_t status = psa_crypto_init();
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if (status != PSA_SUCCESS) {
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mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
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(int) status);
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goto exit;
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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if (argc != 3) {
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mbedtls_printf("usage: mbedtls_pk_sign <key_file> <filename>\n");
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#if defined(_WIN32)
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mbedtls_printf("\n");
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#endif
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goto exit;
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}
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mbedtls_printf("\n . Seeding the random number generator...");
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fflush(stdout);
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if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen(pers))) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
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(unsigned int) -ret);
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goto exit;
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}
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mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
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fflush(stdout);
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if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
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mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
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mbedtls_printf(" failed\n ! Could not parse '%s'\n", argv[1]);
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goto exit;
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}
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/*
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* Compute the SHA-256 hash of the input file,
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* then calculate the signature of the hash.
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*/
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mbedtls_printf("\n . Generating the SHA-256 signature");
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fflush(stdout);
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if ((ret = mbedtls_md_file(
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mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
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argv[2], hash)) != 0) {
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mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
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goto exit;
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}
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if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
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buf, sizeof(buf), &olen,
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mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret);
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goto exit;
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}
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/*
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* Write the signature into <filename>.sig
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*/
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mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[2]);
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if ((f = fopen(filename, "wb+")) == NULL) {
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mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
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goto exit;
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}
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if (fwrite(buf, 1, olen, f) != olen) {
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mbedtls_printf("failed\n ! fwrite failed\n\n");
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fclose(f);
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goto exit;
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}
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fclose(f);
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mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_pk_free(&pk);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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mbedtls_psa_crypto_free();
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_ERROR_C)
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if (exit_code != MBEDTLS_EXIT_SUCCESS) {
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mbedtls_strerror(ret, (char *) buf, sizeof(buf));
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mbedtls_printf(" ! Last error was: %s\n", buf);
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}
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#endif
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
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MBEDTLS_MD_CAN_SHA256 && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
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MBEDTLS_CTR_DRBG_C */
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