142 lines
3.8 KiB
C
142 lines
3.8 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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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_snprintf snprintf
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#define mbedtls_printf printf
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#define mbedtls_exit exit
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif /* MBEDTLS_PLATFORM_C */
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
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!defined(MBEDTLS_SHA256_C) || !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_SHA256_C 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/md.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( argc != 3 )
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{
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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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{
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mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", (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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{
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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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{
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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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{
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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_ERROR_C)
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if( exit_code != MBEDTLS_EXIT_SUCCESS )
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{
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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_SHA256_C &&
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MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */
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