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/*
* RSA/SHA-256 signature creation program
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
/* md.h is included this early since MD_CAN_XXX macros are defined there. */
#include "mbedtls/md.h"
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
!defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_MD_C) || \
!defined(MBEDTLS_FS_IO)
int main(void)
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
"MBEDTLS_MD_C and/or "
"MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_FS_IO not defined.\n");
mbedtls_exit(0);
}
#else
#include "mbedtls/rsa.h"
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
FILE *f;
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
size_t i;
mbedtls_rsa_context rsa;
unsigned char hash[32];
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
char filename[512];
mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
mbedtls_rsa_init(&rsa);
mbedtls_mpi_init(&N); mbedtls_mpi_init(&P); mbedtls_mpi_init(&Q);
mbedtls_mpi_init(&D); mbedtls_mpi_init(&E); mbedtls_mpi_init(&DP);
mbedtls_mpi_init(&DQ); mbedtls_mpi_init(&QP);
if (argc != 2) {
mbedtls_printf("usage: rsa_sign <filename>\n");
#if defined(_WIN32)
mbedtls_printf("\n");
#endif
goto exit;
}
mbedtls_printf("\n . Reading private key from rsa_priv.txt");
fflush(stdout);
if ((f = fopen("rsa_priv.txt", "rb")) == NULL) {
mbedtls_printf(" failed\n ! Could not open rsa_priv.txt\n" \
" ! Please run rsa_genkey first\n\n");
goto exit;
}
if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&E, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&D, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&P, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&Q, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&DP, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&DQ, 16, f)) != 0 ||
(ret = mbedtls_mpi_read_file(&QP, 16, f)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret);
fclose(f);
goto exit;
}
fclose(f);
if ((ret = mbedtls_rsa_import(&rsa, &N, &P, &Q, &D, &E)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_rsa_import returned %d\n\n",
ret);
goto exit;
}
if ((ret = mbedtls_rsa_complete(&rsa)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_rsa_complete returned %d\n\n",
ret);
goto exit;
}
mbedtls_printf("\n . Checking the private key");
fflush(stdout);
if ((ret = mbedtls_rsa_check_privkey(&rsa)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n",
(unsigned int) -ret);
goto exit;
}
/*
* Compute the SHA-256 hash of the input file,
* then calculate the RSA signature of the hash.
*/
mbedtls_printf("\n . Generating the RSA/SHA-256 signature");
fflush(stdout);
if ((ret = mbedtls_md_file(
mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
argv[1], hash)) != 0) {
mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[1]);
goto exit;
}
if ((ret = mbedtls_rsa_pkcs1_sign(&rsa, NULL, NULL, MBEDTLS_MD_SHA256,
32, hash, buf)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n",
(unsigned int) -ret);
goto exit;
}
/*
* Write the signature into <filename>.sig
*/
mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[1]);
if ((f = fopen(filename, "wb+")) == NULL) {
mbedtls_printf(" failed\n ! Could not create %s\n\n", argv[1]);
goto exit;
}
for (i = 0; i < mbedtls_rsa_get_len(&rsa); i++) {
mbedtls_fprintf(f, "%02X%s", buf[i],
(i + 1) % 16 == 0 ? "\r\n" : " ");
}
fclose(f);
mbedtls_printf("\n . Done (created \"%s\")\n\n", filename);
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_rsa_free(&rsa);
mbedtls_mpi_free(&N); mbedtls_mpi_free(&P); mbedtls_mpi_free(&Q);
mbedtls_mpi_free(&D); mbedtls_mpi_free(&E); mbedtls_mpi_free(&DP);
mbedtls_mpi_free(&DQ); mbedtls_mpi_free(&QP);
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA256 &&
MBEDTLS_FS_IO */
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