157 lines
4.2 KiB
C
157 lines
4.2 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
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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_printf printf
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#define mbedtls_snprintf snprintf
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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_RSA_C) || \
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!defined(MBEDTLS_SHA256_C) || !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_SHA256_C 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 "mbedtls/md.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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{
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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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{
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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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{
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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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{
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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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fclose( f );
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if( i != rsa.MBEDTLS_PRIVATE(len) )
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{
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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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{
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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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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\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_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_SHA256_C &&
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MBEDTLS_FS_IO */
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