mirror of
https://github.com/Mbed-TLS/mbedtls.git
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148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/*
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* Public key-based signature verification program
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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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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#define mbedtls_snprintf snprintf
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#define mbedtls_printf printf
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#endif
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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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return( 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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size_t i;
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mbedtls_pk_context pk;
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unsigned char hash[20];
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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( 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", -ret );
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goto exit;
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}
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/*
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* Extract the signature from the text file
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*/
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ret = 1;
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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 compare
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* it with the hash decrypted from 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", -ret );
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goto exit;
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}
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mbedtls_printf( "\n . OK (the decrypted SHA-256 hash matches)\n\n" );
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ret = 0;
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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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mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
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mbedtls_printf( " ! Last error was: %s\n", buf );
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#endif
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#if defined(_WIN32)
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mbedtls_printf( " + Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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return( ret );
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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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