mbedtls/programs/pkey/pk_verify.c
2015-07-28 17:11:58 +02:00

148 lines
3.9 KiB
C

/*
* Public key-based signature verification program
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_snprintf snprintf
#define mbedtls_printf printf
#endif
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
!defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_PK_PARSE_C) || \
!defined(MBEDTLS_FS_IO)
int main( void )
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
"MBEDTLS_SHA256_C and/or MBEDTLS_PK_PARSE_C and/or "
"MBEDTLS_FS_IO not defined.\n");
return( 0 );
}
#else
#include "mbedtls/error.h"
#include "mbedtls/md.h"
#include "mbedtls/pk.h"
#include <stdio.h>
#include <string.h>
int main( int argc, char *argv[] )
{
FILE *f;
int ret = 1;
size_t i;
mbedtls_pk_context pk;
unsigned char hash[20];
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
char filename[512];
mbedtls_pk_init( &pk );
if( argc != 3 )
{
mbedtls_printf( "usage: mbedtls_pk_verify <key_file> <filename>\n" );
#if defined(_WIN32)
mbedtls_printf( "\n" );
#endif
goto exit;
}
mbedtls_printf( "\n . Reading public key from '%s'", argv[1] );
fflush( stdout );
if( ( ret = mbedtls_pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n", -ret );
goto exit;
}
/*
* Extract the signature from the text file
*/
ret = 1;
mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
mbedtls_printf( "\n ! Could not open %s\n\n", filename );
goto exit;
}
i = fread( buf, 1, sizeof(buf), f );
fclose( f );
/*
* Compute the SHA-256 hash of the input file and compare
* it with the hash decrypted from the signature.
*/
mbedtls_printf( "\n . Verifying the SHA-256 signature" );
fflush( stdout );
if( ( ret = mbedtls_md_file(
mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ),
argv[2], hash ) ) != 0 )
{
mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
goto exit;
}
if( ( ret = mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256, hash, 0,
buf, i ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_pk_verify returned -0x%04x\n", -ret );
goto exit;
}
mbedtls_printf( "\n . OK (the decrypted SHA-256 hash matches)\n\n" );
ret = 0;
exit:
mbedtls_pk_free( &pk );
#if defined(MBEDTLS_ERROR_C)
mbedtls_strerror( ret, (char *) buf, sizeof(buf) );
mbedtls_printf( " ! Last error was: %s\n", buf );
#endif
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_SHA256_C &&
MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */