131 lines
3.4 KiB
C
131 lines
3.4 KiB
C
/*
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* RSA/SHA-256 signature verification 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_RSA_C) || \
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!defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_MD_C) || \
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!defined(MBEDTLS_FS_IO)
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int main(void)
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
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"MBEDTLS_MD_C and/or "
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"MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_FS_IO 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/rsa.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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unsigned c;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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size_t i;
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mbedtls_rsa_context rsa;
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unsigned char hash[32];
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unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
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char filename[512];
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mbedtls_rsa_init(&rsa);
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if (argc != 2) {
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mbedtls_printf("usage: rsa_verify <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 . Reading public key from rsa_pub.txt");
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fflush(stdout);
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if ((f = fopen("rsa_pub.txt", "rb")) == NULL) {
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mbedtls_printf(" failed\n ! Could not open rsa_pub.txt\n" \
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" ! Please run rsa_genkey first\n\n");
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goto exit;
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}
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if ((ret = mbedtls_mpi_read_file(&rsa.MBEDTLS_PRIVATE(N), 16, f)) != 0 ||
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(ret = mbedtls_mpi_read_file(&rsa.MBEDTLS_PRIVATE(E), 16, f)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret);
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fclose(f);
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goto exit;
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}
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rsa.MBEDTLS_PRIVATE(len) = (mbedtls_mpi_bitlen(&rsa.MBEDTLS_PRIVATE(N)) + 7) >> 3;
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fclose(f);
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/*
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* Extract the RSA signature from the text file
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*/
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mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[1]);
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if ((f = fopen(filename, "rb")) == NULL) {
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mbedtls_printf("\n ! Could not open %s\n\n", filename);
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goto exit;
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}
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i = 0;
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while (fscanf(f, "%02X", (unsigned int *) &c) > 0 &&
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i < (int) sizeof(buf)) {
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buf[i++] = (unsigned char) c;
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}
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fclose(f);
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if (i != rsa.MBEDTLS_PRIVATE(len)) {
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mbedtls_printf("\n ! Invalid RSA signature format\n\n");
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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 and
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* verify the signature
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*/
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mbedtls_printf("\n . Verifying the RSA/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[1], hash)) != 0) {
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mbedtls_printf(" failed\n ! Could not open or read %s\n\n", argv[1]);
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goto exit;
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}
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if ((ret = mbedtls_rsa_pkcs1_verify(&rsa, MBEDTLS_MD_SHA256,
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32, hash, buf)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\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 . OK (the signature is valid)\n\n");
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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mbedtls_rsa_free(&rsa);
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mbedtls_exit(exit_code);
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA256 &&
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MBEDTLS_FS_IO */
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