566 lines
16 KiB
C
Executable File
566 lines
16 KiB
C
Executable File
/*
|
|
* \brief Generic file encryption program using generic wrappers for configured
|
|
* security.
|
|
*
|
|
* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
|
|
* SPDX-License-Identifier: GPL-2.0
|
|
*
|
|
* 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.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
|
|
/* Enable definition of fileno() even when compiling with -std=c99. Must be
|
|
* set before config.h, which pulls in glibc's features.h indirectly.
|
|
* Harmless on other platforms. */
|
|
#define _POSIX_C_SOURCE 1
|
|
|
|
#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>
|
|
#include <stdlib.h>
|
|
#define mbedtls_fprintf fprintf
|
|
#define mbedtls_printf printf
|
|
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
|
|
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
|
|
#endif /* MBEDTLS_PLATFORM_C */
|
|
|
|
#if defined(MBEDTLS_CIPHER_C) && defined(MBEDTLS_MD_C) && \
|
|
defined(MBEDTLS_FS_IO)
|
|
#include "mbedtls/cipher.h"
|
|
#include "mbedtls/md.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#endif
|
|
|
|
#if defined(_WIN32)
|
|
#include <windows.h>
|
|
#if !defined(_WIN32_WCE)
|
|
#include <io.h>
|
|
#endif
|
|
#else
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#define MODE_ENCRYPT 0
|
|
#define MODE_DECRYPT 1
|
|
|
|
#define USAGE \
|
|
"\n crypt_and_hash <mode> <input filename> <output filename> <cipher> <mbedtls_md> <key>\n" \
|
|
"\n <mode>: 0 = encrypt, 1 = decrypt\n" \
|
|
"\n example: crypt_and_hash 0 file file.aes AES-128-CBC SHA1 hex:E76B2413958B00E193\n" \
|
|
"\n"
|
|
|
|
#if !defined(MBEDTLS_CIPHER_C) || !defined(MBEDTLS_MD_C) || \
|
|
!defined(MBEDTLS_FS_IO)
|
|
int main( void )
|
|
{
|
|
mbedtls_printf("MBEDTLS_CIPHER_C and/or MBEDTLS_MD_C and/or MBEDTLS_FS_IO not defined.\n");
|
|
return( 0 );
|
|
}
|
|
#else
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
int ret = 1, i, n;
|
|
int exit_code = MBEDTLS_EXIT_FAILURE;
|
|
int mode;
|
|
size_t keylen, ilen, olen;
|
|
FILE *fkey, *fin = NULL, *fout = NULL;
|
|
|
|
char *p;
|
|
unsigned char IV[16];
|
|
unsigned char key[512];
|
|
unsigned char digest[MBEDTLS_MD_MAX_SIZE];
|
|
unsigned char buffer[1024];
|
|
unsigned char output[1024];
|
|
unsigned char diff;
|
|
|
|
const mbedtls_cipher_info_t *cipher_info;
|
|
const mbedtls_md_info_t *md_info;
|
|
mbedtls_cipher_context_t cipher_ctx;
|
|
mbedtls_md_context_t md_ctx;
|
|
#if defined(_WIN32_WCE)
|
|
long filesize, offset;
|
|
#elif defined(_WIN32)
|
|
LARGE_INTEGER li_size;
|
|
__int64 filesize, offset;
|
|
#else
|
|
off_t filesize, offset;
|
|
#endif
|
|
|
|
mbedtls_cipher_init( &cipher_ctx );
|
|
mbedtls_md_init( &md_ctx );
|
|
|
|
/*
|
|
* Parse the command-line arguments.
|
|
*/
|
|
if( argc != 7 )
|
|
{
|
|
const int *list;
|
|
|
|
mbedtls_printf( USAGE );
|
|
|
|
mbedtls_printf( "Available ciphers:\n" );
|
|
list = mbedtls_cipher_list();
|
|
while( *list )
|
|
{
|
|
cipher_info = mbedtls_cipher_info_from_type( *list );
|
|
mbedtls_printf( " %s\n", cipher_info->name );
|
|
list++;
|
|
}
|
|
|
|
mbedtls_printf( "\nAvailable message digests:\n" );
|
|
list = mbedtls_md_list();
|
|
while( *list )
|
|
{
|
|
md_info = mbedtls_md_info_from_type( *list );
|
|
mbedtls_printf( " %s\n", mbedtls_md_get_name( md_info ) );
|
|
list++;
|
|
}
|
|
|
|
#if defined(_WIN32)
|
|
mbedtls_printf( "\n Press Enter to exit this program.\n" );
|
|
fflush( stdout ); getchar();
|
|
#endif
|
|
|
|
goto exit;
|
|
}
|
|
|
|
mode = atoi( argv[1] );
|
|
|
|
if( mode != MODE_ENCRYPT && mode != MODE_DECRYPT )
|
|
{
|
|
mbedtls_fprintf( stderr, "invalid operation mode\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( strcmp( argv[2], argv[3] ) == 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "input and output filenames must differ\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( ( fin = fopen( argv[2], "rb" ) ) == NULL )
|
|
{
|
|
mbedtls_fprintf( stderr, "fopen(%s,rb) failed\n", argv[2] );
|
|
goto exit;
|
|
}
|
|
|
|
if( ( fout = fopen( argv[3], "wb+" ) ) == NULL )
|
|
{
|
|
mbedtls_fprintf( stderr, "fopen(%s,wb+) failed\n", argv[3] );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Read the Cipher and MD from the command line
|
|
*/
|
|
cipher_info = mbedtls_cipher_info_from_string( argv[4] );
|
|
if( cipher_info == NULL )
|
|
{
|
|
mbedtls_fprintf( stderr, "Cipher '%s' not found\n", argv[4] );
|
|
goto exit;
|
|
}
|
|
if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info) ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_setup failed\n" );
|
|
goto exit;
|
|
}
|
|
|
|
md_info = mbedtls_md_info_from_string( argv[5] );
|
|
if( md_info == NULL )
|
|
{
|
|
mbedtls_fprintf( stderr, "Message Digest '%s' not found\n", argv[5] );
|
|
goto exit;
|
|
}
|
|
|
|
if( mbedtls_md_setup( &md_ctx, md_info, 1 ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_md_setup failed\n" );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Read the secret key from file or command line
|
|
*/
|
|
if( ( fkey = fopen( argv[6], "rb" ) ) != NULL )
|
|
{
|
|
keylen = fread( key, 1, sizeof( key ), fkey );
|
|
fclose( fkey );
|
|
}
|
|
else
|
|
{
|
|
if( memcmp( argv[6], "hex:", 4 ) == 0 )
|
|
{
|
|
p = &argv[6][4];
|
|
keylen = 0;
|
|
|
|
while( sscanf( p, "%02X", &n ) > 0 &&
|
|
keylen < (int) sizeof( key ) )
|
|
{
|
|
key[keylen++] = (unsigned char) n;
|
|
p += 2;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
keylen = strlen( argv[6] );
|
|
|
|
if( keylen > (int) sizeof( key ) )
|
|
keylen = (int) sizeof( key );
|
|
|
|
memcpy( key, argv[6], keylen );
|
|
}
|
|
}
|
|
|
|
#if defined(_WIN32_WCE)
|
|
filesize = fseek( fin, 0L, SEEK_END );
|
|
#else
|
|
#if defined(_WIN32)
|
|
/*
|
|
* Support large files (> 2Gb) on Win32
|
|
*/
|
|
li_size.QuadPart = 0;
|
|
li_size.LowPart =
|
|
SetFilePointer( (HANDLE) _get_osfhandle( _fileno( fin ) ),
|
|
li_size.LowPart, &li_size.HighPart, FILE_END );
|
|
|
|
if( li_size.LowPart == 0xFFFFFFFF && GetLastError() != NO_ERROR )
|
|
{
|
|
mbedtls_fprintf( stderr, "SetFilePointer(0,FILE_END) failed\n" );
|
|
goto exit;
|
|
}
|
|
|
|
filesize = li_size.QuadPart;
|
|
#else
|
|
if( ( filesize = lseek( fileno( fin ), 0, SEEK_END ) ) < 0 )
|
|
{
|
|
perror( "lseek" );
|
|
goto exit;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
if( fseek( fin, 0, SEEK_SET ) < 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "fseek(0,SEEK_SET) failed\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( mode == MODE_ENCRYPT )
|
|
{
|
|
/*
|
|
* Generate the initialization vector as:
|
|
* IV = MD( filesize || filename )[0..15]
|
|
*/
|
|
for( i = 0; i < 8; i++ )
|
|
buffer[i] = (unsigned char)( filesize >> ( i << 3 ) );
|
|
|
|
p = argv[2];
|
|
|
|
mbedtls_md_starts( &md_ctx );
|
|
mbedtls_md_update( &md_ctx, buffer, 8 );
|
|
mbedtls_md_update( &md_ctx, (unsigned char *) p, strlen( p ) );
|
|
mbedtls_md_finish( &md_ctx, digest );
|
|
|
|
memcpy( IV, digest, 16 );
|
|
|
|
/*
|
|
* Append the IV at the beginning of the output.
|
|
*/
|
|
if( fwrite( IV, 1, 16, fout ) != 16 )
|
|
{
|
|
mbedtls_fprintf( stderr, "fwrite(%d bytes) failed\n", 16 );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Hash the IV and the secret key together 8192 times
|
|
* using the result to setup the AES context and HMAC.
|
|
*/
|
|
memset( digest, 0, 32 );
|
|
memcpy( digest, IV, 16 );
|
|
|
|
for( i = 0; i < 8192; i++ )
|
|
{
|
|
mbedtls_md_starts( &md_ctx );
|
|
mbedtls_md_update( &md_ctx, digest, 32 );
|
|
mbedtls_md_update( &md_ctx, key, keylen );
|
|
mbedtls_md_finish( &md_ctx, digest );
|
|
|
|
}
|
|
|
|
if( mbedtls_cipher_setkey( &cipher_ctx, digest, cipher_info->key_bitlen,
|
|
MBEDTLS_ENCRYPT ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_setkey() returned error\n");
|
|
goto exit;
|
|
}
|
|
if( mbedtls_cipher_set_iv( &cipher_ctx, IV, 16 ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_set_iv() returned error\n");
|
|
goto exit;
|
|
}
|
|
if( mbedtls_cipher_reset( &cipher_ctx ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_reset() returned error\n");
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_md_hmac_starts( &md_ctx, digest, 32 );
|
|
|
|
/*
|
|
* Encrypt and write the ciphertext.
|
|
*/
|
|
for( offset = 0; offset < filesize; offset += mbedtls_cipher_get_block_size( &cipher_ctx ) )
|
|
{
|
|
ilen = ( (unsigned int) filesize - offset > mbedtls_cipher_get_block_size( &cipher_ctx ) ) ?
|
|
mbedtls_cipher_get_block_size( &cipher_ctx ) : (unsigned int) ( filesize - offset );
|
|
|
|
if( fread( buffer, 1, ilen, fin ) != ilen )
|
|
{
|
|
mbedtls_fprintf( stderr, "fread(%ld bytes) failed\n", (long) ilen );
|
|
goto exit;
|
|
}
|
|
|
|
if( mbedtls_cipher_update( &cipher_ctx, buffer, ilen, output, &olen ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_update() returned error\n");
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_md_hmac_update( &md_ctx, output, olen );
|
|
|
|
if( fwrite( output, 1, olen, fout ) != olen )
|
|
{
|
|
mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if( mbedtls_cipher_finish( &cipher_ctx, output, &olen ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_finish() returned error\n" );
|
|
goto exit;
|
|
}
|
|
mbedtls_md_hmac_update( &md_ctx, output, olen );
|
|
|
|
if( fwrite( output, 1, olen, fout ) != olen )
|
|
{
|
|
mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Finally write the HMAC.
|
|
*/
|
|
mbedtls_md_hmac_finish( &md_ctx, digest );
|
|
|
|
if( fwrite( digest, 1, mbedtls_md_get_size( md_info ), fout ) != mbedtls_md_get_size( md_info ) )
|
|
{
|
|
mbedtls_fprintf( stderr, "fwrite(%d bytes) failed\n", mbedtls_md_get_size( md_info ) );
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if( mode == MODE_DECRYPT )
|
|
{
|
|
/*
|
|
* The encrypted file must be structured as follows:
|
|
*
|
|
* 00 .. 15 Initialization Vector
|
|
* 16 .. 31 Encrypted Block #1
|
|
* ..
|
|
* N*16 .. (N+1)*16 - 1 Encrypted Block #N
|
|
* (N+1)*16 .. (N+1)*16 + n Hash(ciphertext)
|
|
*/
|
|
if( filesize < 16 + mbedtls_md_get_size( md_info ) )
|
|
{
|
|
mbedtls_fprintf( stderr, "File too short to be encrypted.\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( mbedtls_cipher_get_block_size( &cipher_ctx ) == 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "Invalid cipher block size: 0. \n" );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Check the file size.
|
|
*/
|
|
if( cipher_info->mode != MBEDTLS_MODE_GCM &&
|
|
( ( filesize - mbedtls_md_get_size( md_info ) ) %
|
|
mbedtls_cipher_get_block_size( &cipher_ctx ) ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "File content not a multiple of the block size (%d).\n",
|
|
mbedtls_cipher_get_block_size( &cipher_ctx ));
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Subtract the IV + HMAC length.
|
|
*/
|
|
filesize -= ( 16 + mbedtls_md_get_size( md_info ) );
|
|
|
|
/*
|
|
* Read the IV and original filesize modulo 16.
|
|
*/
|
|
if( fread( buffer, 1, 16, fin ) != 16 )
|
|
{
|
|
mbedtls_fprintf( stderr, "fread(%d bytes) failed\n", 16 );
|
|
goto exit;
|
|
}
|
|
|
|
memcpy( IV, buffer, 16 );
|
|
|
|
/*
|
|
* Hash the IV and the secret key together 8192 times
|
|
* using the result to setup the AES context and HMAC.
|
|
*/
|
|
memset( digest, 0, 32 );
|
|
memcpy( digest, IV, 16 );
|
|
|
|
for( i = 0; i < 8192; i++ )
|
|
{
|
|
mbedtls_md_starts( &md_ctx );
|
|
mbedtls_md_update( &md_ctx, digest, 32 );
|
|
mbedtls_md_update( &md_ctx, key, keylen );
|
|
mbedtls_md_finish( &md_ctx, digest );
|
|
}
|
|
|
|
if( mbedtls_cipher_setkey( &cipher_ctx, digest, cipher_info->key_bitlen,
|
|
MBEDTLS_DECRYPT ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_setkey() returned error\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( mbedtls_cipher_set_iv( &cipher_ctx, IV, 16 ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_set_iv() returned error\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( mbedtls_cipher_reset( &cipher_ctx ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_reset() returned error\n" );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_md_hmac_starts( &md_ctx, digest, 32 );
|
|
|
|
/*
|
|
* Decrypt and write the plaintext.
|
|
*/
|
|
for( offset = 0; offset < filesize; offset += mbedtls_cipher_get_block_size( &cipher_ctx ) )
|
|
{
|
|
ilen = ( (unsigned int) filesize - offset > mbedtls_cipher_get_block_size( &cipher_ctx ) ) ?
|
|
mbedtls_cipher_get_block_size( &cipher_ctx ) : (unsigned int) ( filesize - offset );
|
|
|
|
if( fread( buffer, 1, ilen, fin ) != ilen )
|
|
{
|
|
mbedtls_fprintf( stderr, "fread(%d bytes) failed\n",
|
|
mbedtls_cipher_get_block_size( &cipher_ctx ) );
|
|
goto exit;
|
|
}
|
|
|
|
mbedtls_md_hmac_update( &md_ctx, buffer, ilen );
|
|
if( mbedtls_cipher_update( &cipher_ctx, buffer, ilen, output,
|
|
&olen ) != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "mbedtls_cipher_update() returned error\n" );
|
|
goto exit;
|
|
}
|
|
|
|
if( fwrite( output, 1, olen, fout ) != olen )
|
|
{
|
|
mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Verify the message authentication code.
|
|
*/
|
|
mbedtls_md_hmac_finish( &md_ctx, digest );
|
|
|
|
if( fread( buffer, 1, mbedtls_md_get_size( md_info ), fin ) != mbedtls_md_get_size( md_info ) )
|
|
{
|
|
mbedtls_fprintf( stderr, "fread(%d bytes) failed\n", mbedtls_md_get_size( md_info ) );
|
|
goto exit;
|
|
}
|
|
|
|
/* Use constant-time buffer comparison */
|
|
diff = 0;
|
|
for( i = 0; i < mbedtls_md_get_size( md_info ); i++ )
|
|
diff |= digest[i] ^ buffer[i];
|
|
|
|
if( diff != 0 )
|
|
{
|
|
mbedtls_fprintf( stderr, "HMAC check failed: wrong key, "
|
|
"or file corrupted.\n" );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Write the final block of data
|
|
*/
|
|
mbedtls_cipher_finish( &cipher_ctx, output, &olen );
|
|
|
|
if( fwrite( output, 1, olen, fout ) != olen )
|
|
{
|
|
mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
exit_code = MBEDTLS_EXIT_SUCCESS;
|
|
|
|
exit:
|
|
if( fin )
|
|
fclose( fin );
|
|
if( fout )
|
|
fclose( fout );
|
|
|
|
/* Zeroize all command line arguments to also cover
|
|
the case when the user has missed or reordered some,
|
|
in which case the key might not be in argv[6]. */
|
|
for( i = 0; i < argc; i++ )
|
|
memset( argv[i], 0, strlen( argv[i] ) );
|
|
|
|
memset( IV, 0, sizeof( IV ) );
|
|
memset( key, 0, sizeof( key ) );
|
|
memset( buffer, 0, sizeof( buffer ) );
|
|
memset( output, 0, sizeof( output ) );
|
|
memset( digest, 0, sizeof( digest ) );
|
|
|
|
mbedtls_cipher_free( &cipher_ctx );
|
|
mbedtls_md_free( &md_ctx );
|
|
|
|
return( exit_code );
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_C && MBEDTLS_MD_C && MBEDTLS_FS_IO */
|