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/*
* Public key-based signature creation program
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
#include "mbedtls/md.h"
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_MD_C) || \
!defined(MBEDTLS_PK_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
!defined(MBEDTLS_CTR_DRBG_C)
int main(void)
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
"MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_MD_C and/or "
"MBEDTLS_PK_PARSE_C and/or MBEDTLS_FS_IO and/or "
"MBEDTLS_CTR_DRBG_C not defined.\n");
mbedtls_exit(0);
}
#else
#include "mbedtls/error.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/pk.h"
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
FILE *f;
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_pk_context pk;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
unsigned char hash[32];
unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
char filename[512];
const char *pers = "mbedtls_pk_sign";
size_t olen = 0;
mbedtls_entropy_init(&entropy);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_pk_init(&pk);
if (argc != 3) {
mbedtls_printf("usage: mbedtls_pk_sign <key_file> <filename>\n");
#if defined(_WIN32)
mbedtls_printf("\n");
#endif
goto exit;
}
mbedtls_printf("\n . Seeding the random number generator...");
fflush(stdout);
if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen(pers))) != 0) {
mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
(unsigned int) -ret);
goto exit;
}
mbedtls_printf("\n . Reading private key from '%s'", argv[1]);
fflush(stdout);
if ((ret = mbedtls_pk_parse_keyfile(&pk, argv[1], "",
mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
mbedtls_printf(" failed\n ! Could not parse '%s'\n", argv[1]);
goto exit;
}
/*
* Compute the SHA-256 hash of the input file,
* then calculate the signature of the hash.
*/
mbedtls_printf("\n . Generating the SHA-256 signature");
fflush(stdout);
if ((ret = mbedtls_md_file(
mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
argv[2], hash)) != 0) {
mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[2]);
goto exit;
}
if ((ret = mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256, hash, 0,
buf, sizeof(buf), &olen,
mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_pk_sign returned -0x%04x\n", (unsigned int) -ret);
goto exit;
}
/*
* Write the signature into <filename>.sig
*/
mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[2]);
if ((f = fopen(filename, "wb+")) == NULL) {
mbedtls_printf(" failed\n ! Could not create %s\n\n", filename);
goto exit;
}
if (fwrite(buf, 1, olen, f) != olen) {
mbedtls_printf("failed\n ! fwrite failed\n\n");
fclose(f);
goto exit;
}
fclose(f);
mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_pk_free(&pk);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
#if defined(MBEDTLS_ERROR_C)
if (exit_code != MBEDTLS_EXIT_SUCCESS) {
mbedtls_strerror(ret, (char *) buf, sizeof(buf));
mbedtls_printf(" ! Last error was: %s\n", buf);
}
#endif
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
MBEDTLS_MD_CAN_SHA256 && MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO &&
MBEDTLS_CTR_DRBG_C */
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