140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*
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* Public key-based 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
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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_MD_C) || \
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!defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_PK_PARSE_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_MD_C and/or "
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"MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_PK_PARSE_C and/or "
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"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/error.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_PK_SIGNATURE_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: mbedtls_pk_verify <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 ! mbedtls_pk_parse_public_keyfile 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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/*
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* Extract the signature from the file
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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, "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, sizeof(buf), 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 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 -0x%04x\n", (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_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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#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_MD_CAN_SHA256 &&
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MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
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