136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* RSASSA-PSS/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_MD_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_MD_CAN_SHA256) || \
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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_MD_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_RSA_C and/or MBEDTLS_MD_CAN_SHA256 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/md.h"
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#include "mbedtls/pem.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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size_t i;
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mbedtls_pk_context pk;
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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_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: rsa_verify_pss <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 . Reading public key from '%s'", argv[1]);
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fflush(stdout);
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if ((ret = mbedtls_pk_parse_public_keyfile(&pk, argv[1])) != 0) {
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mbedtls_printf(" failed\n ! Could not read key from '%s'\n", argv[1]);
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mbedtls_printf(" ! mbedtls_pk_parse_public_keyfile returned %d\n\n", ret);
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goto exit;
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}
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if (!mbedtls_pk_can_do(&pk, MBEDTLS_PK_RSA)) {
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mbedtls_printf(" failed\n ! Key is not an RSA key\n");
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goto exit;
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}
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if ((ret = mbedtls_rsa_set_padding(mbedtls_pk_rsa(pk),
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MBEDTLS_RSA_PKCS_V21,
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MBEDTLS_MD_SHA256)) != 0) {
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mbedtls_printf(" failed\n ! Invalid padding\n");
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goto exit;
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}
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/*
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* Extract the RSA signature from the file
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*/
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mbedtls_snprintf(filename, 512, "%s.sig", argv[2]);
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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 = fread(buf, 1, MBEDTLS_MPI_MAX_SIZE, f);
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fclose(f);
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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[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_verify(&pk, MBEDTLS_MD_SHA256, hash, 0,
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buf, i)) != 0) {
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mbedtls_printf(" failed\n ! mbedtls_pk_verify returned %d\n\n", 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_pk_free(&pk);
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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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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_PK_PARSE_C && MBEDTLS_FS_IO */
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