545 lines
16 KiB
C
545 lines
16 KiB
C
/*
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* \brief Generic file encryption program using generic wrappers for configured
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* security.
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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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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* This file is part of mbed TLS (https://tls.mbed.org)
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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_fprintf fprintf
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#define mbedtls_printf printf
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#endif
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#if defined(MBEDTLS_CIPHER_C) && defined(MBEDTLS_MD_C) && \
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defined(MBEDTLS_FS_IO)
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#include "mbedtls/cipher.h"
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#include "mbedtls/md.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#endif
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#if defined(_WIN32)
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#include <windows.h>
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#if !defined(_WIN32_WCE)
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#include <io.h>
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#endif
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#else
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#define MODE_ENCRYPT 0
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#define MODE_DECRYPT 1
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#define USAGE \
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"\n crypt_and_hash <mode> <input filename> <output filename> <cipher> <mbedtls_md> <key>\n" \
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"\n <mode>: 0 = encrypt, 1 = decrypt\n" \
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"\n example: crypt_and_hash 0 file file.aes AES-128-CBC SHA1 hex:E76B2413958B00E193\n" \
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"\n"
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#if !defined(MBEDTLS_CIPHER_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_CIPHER_C and/or MBEDTLS_MD_C and/or 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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int main( int argc, char *argv[] )
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{
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int ret = 1, i, n;
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int mode, lastn;
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size_t keylen, ilen, olen;
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FILE *fkey, *fin = NULL, *fout = NULL;
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char *p;
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unsigned char IV[16];
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unsigned char key[512];
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unsigned char digest[MBEDTLS_MD_MAX_SIZE];
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unsigned char buffer[1024];
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unsigned char output[1024];
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unsigned char diff;
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const mbedtls_cipher_info_t *cipher_info;
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const mbedtls_md_info_t *md_info;
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mbedtls_cipher_context_t cipher_ctx;
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mbedtls_md_context_t md_ctx;
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#if defined(_WIN32_WCE)
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long filesize, offset;
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#elif defined(_WIN32)
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LARGE_INTEGER li_size;
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__int64 filesize, offset;
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#else
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off_t filesize, offset;
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#endif
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mbedtls_cipher_init( &cipher_ctx );
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mbedtls_md_init( &md_ctx );
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/*
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* Parse the command-line arguments.
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*/
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if( argc != 7 )
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{
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const int *list;
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mbedtls_printf( USAGE );
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mbedtls_printf( "Available ciphers:\n" );
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list = mbedtls_cipher_list();
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while( *list )
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{
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cipher_info = mbedtls_cipher_info_from_type( *list );
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mbedtls_printf( " %s\n", cipher_info->name );
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list++;
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}
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mbedtls_printf( "\nAvailable message digests:\n" );
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list = mbedtls_md_list();
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while( *list )
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{
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md_info = mbedtls_md_info_from_type( *list );
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mbedtls_printf( " %s\n", mbedtls_md_get_name( md_info ) );
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list++;
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}
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#if defined(_WIN32)
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mbedtls_printf( "\n Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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goto exit;
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}
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mode = atoi( argv[1] );
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if( mode != MODE_ENCRYPT && mode != MODE_DECRYPT )
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{
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mbedtls_fprintf( stderr, "invalid operation mode\n" );
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goto exit;
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}
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if( strcmp( argv[2], argv[3] ) == 0 )
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{
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mbedtls_fprintf( stderr, "input and output filenames must differ\n" );
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goto exit;
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}
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if( ( fin = fopen( argv[2], "rb" ) ) == NULL )
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{
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mbedtls_fprintf( stderr, "fopen(%s,rb) failed\n", argv[2] );
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goto exit;
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}
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if( ( fout = fopen( argv[3], "wb+" ) ) == NULL )
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{
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mbedtls_fprintf( stderr, "fopen(%s,wb+) failed\n", argv[3] );
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goto exit;
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}
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/*
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* Read the Cipher and MD from the command line
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*/
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cipher_info = mbedtls_cipher_info_from_string( argv[4] );
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if( cipher_info == NULL )
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{
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mbedtls_fprintf( stderr, "Cipher '%s' not found\n", argv[4] );
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goto exit;
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}
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if( ( ret = mbedtls_cipher_setup( &cipher_ctx, cipher_info) ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_setup failed\n" );
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goto exit;
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}
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md_info = mbedtls_md_info_from_string( argv[5] );
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if( md_info == NULL )
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{
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mbedtls_fprintf( stderr, "Message Digest '%s' not found\n", argv[5] );
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goto exit;
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}
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mbedtls_md_setup( &md_ctx, md_info, 1 );
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/*
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* Read the secret key and clean the command line.
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*/
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if( ( fkey = fopen( argv[6], "rb" ) ) != NULL )
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{
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keylen = fread( key, 1, sizeof( key ), fkey );
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fclose( fkey );
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}
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else
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{
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if( memcmp( argv[6], "hex:", 4 ) == 0 )
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{
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p = &argv[6][4];
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keylen = 0;
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while( sscanf( p, "%02X", &n ) > 0 &&
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keylen < (int) sizeof( key ) )
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{
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key[keylen++] = (unsigned char) n;
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p += 2;
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}
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}
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else
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{
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keylen = strlen( argv[6] );
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if( keylen > (int) sizeof( key ) )
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keylen = (int) sizeof( key );
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memcpy( key, argv[6], keylen );
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}
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}
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memset( argv[6], 0, strlen( argv[6] ) );
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#if defined(_WIN32_WCE)
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filesize = fseek( fin, 0L, SEEK_END );
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#else
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#if defined(_WIN32)
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/*
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* Support large files (> 2Gb) on Win32
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*/
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li_size.QuadPart = 0;
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li_size.LowPart =
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SetFilePointer( (HANDLE) _get_osfhandle( _fileno( fin ) ),
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li_size.LowPart, &li_size.HighPart, FILE_END );
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if( li_size.LowPart == 0xFFFFFFFF && GetLastError() != NO_ERROR )
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{
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mbedtls_fprintf( stderr, "SetFilePointer(0,FILE_END) failed\n" );
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goto exit;
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}
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filesize = li_size.QuadPart;
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#else
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if( ( filesize = lseek( fileno( fin ), 0, SEEK_END ) ) < 0 )
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{
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perror( "lseek" );
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goto exit;
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}
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#endif
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#endif
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if( fseek( fin, 0, SEEK_SET ) < 0 )
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{
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mbedtls_fprintf( stderr, "fseek(0,SEEK_SET) failed\n" );
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goto exit;
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}
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if( mode == MODE_ENCRYPT )
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{
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/*
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* Generate the initialization vector as:
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* IV = SHA-256( filesize || filename )[0..15]
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*/
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for( i = 0; i < 8; i++ )
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buffer[i] = (unsigned char)( filesize >> ( i << 3 ) );
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p = argv[2];
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mbedtls_md_starts( &md_ctx );
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mbedtls_md_update( &md_ctx, buffer, 8 );
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mbedtls_md_update( &md_ctx, (unsigned char *) p, strlen( p ) );
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mbedtls_md_finish( &md_ctx, digest );
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memcpy( IV, digest, 16 );
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/*
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* The last four bits in the IV are actually used
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* to store the file size modulo the AES block size.
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*/
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lastn = (int)( filesize & 0x0F );
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IV[15] = (unsigned char)
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( ( IV[15] & 0xF0 ) | lastn );
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/*
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* Append the IV at the beginning of the output.
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*/
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if( fwrite( IV, 1, 16, fout ) != 16 )
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{
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mbedtls_fprintf( stderr, "fwrite(%d bytes) failed\n", 16 );
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goto exit;
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}
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/*
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* Hash the IV and the secret key together 8192 times
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* using the result to setup the AES context and HMAC.
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*/
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memset( digest, 0, 32 );
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memcpy( digest, IV, 16 );
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for( i = 0; i < 8192; i++ )
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{
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mbedtls_md_starts( &md_ctx );
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mbedtls_md_update( &md_ctx, digest, 32 );
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mbedtls_md_update( &md_ctx, key, keylen );
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mbedtls_md_finish( &md_ctx, digest );
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}
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memset( key, 0, sizeof( key ) );
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if( mbedtls_cipher_setkey( &cipher_ctx, digest, cipher_info->key_bitlen,
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MBEDTLS_ENCRYPT ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_setkey() returned error\n");
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goto exit;
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}
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if( mbedtls_cipher_set_iv( &cipher_ctx, IV, 16 ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_set_iv() returned error\n");
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goto exit;
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}
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if( mbedtls_cipher_reset( &cipher_ctx ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_reset() returned error\n");
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goto exit;
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}
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mbedtls_md_hmac_starts( &md_ctx, digest, 32 );
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/*
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* Encrypt and write the ciphertext.
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*/
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for( offset = 0; offset < filesize; offset += mbedtls_cipher_get_block_size( &cipher_ctx ) )
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{
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ilen = ( (unsigned int) filesize - offset > mbedtls_cipher_get_block_size( &cipher_ctx ) ) ?
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mbedtls_cipher_get_block_size( &cipher_ctx ) : (unsigned int) ( filesize - offset );
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if( fread( buffer, 1, ilen, fin ) != ilen )
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{
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mbedtls_fprintf( stderr, "fread(%ld bytes) failed\n", (long) ilen );
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goto exit;
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}
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if( mbedtls_cipher_update( &cipher_ctx, buffer, ilen, output, &olen ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_update() returned error\n");
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goto exit;
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}
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mbedtls_md_hmac_update( &md_ctx, output, olen );
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if( fwrite( output, 1, olen, fout ) != olen )
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{
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mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
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goto exit;
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}
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}
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if( mbedtls_cipher_finish( &cipher_ctx, output, &olen ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_finish() returned error\n" );
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goto exit;
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}
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mbedtls_md_hmac_update( &md_ctx, output, olen );
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if( fwrite( output, 1, olen, fout ) != olen )
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{
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mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
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goto exit;
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}
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/*
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* Finally write the HMAC.
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*/
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mbedtls_md_hmac_finish( &md_ctx, digest );
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if( fwrite( digest, 1, mbedtls_md_get_size( md_info ), fout ) != mbedtls_md_get_size( md_info ) )
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{
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mbedtls_fprintf( stderr, "fwrite(%d bytes) failed\n", mbedtls_md_get_size( md_info ) );
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goto exit;
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}
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}
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if( mode == MODE_DECRYPT )
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{
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/*
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* The encrypted file must be structured as follows:
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*
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* 00 .. 15 Initialization Vector
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* 16 .. 31 AES Encrypted Block #1
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* ..
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* N*16 .. (N+1)*16 - 1 AES Encrypted Block #N
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* (N+1)*16 .. (N+1)*16 + 32 HMAC-SHA-256(ciphertext)
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*/
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if( filesize < 16 + mbedtls_md_get_size( md_info ) )
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{
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mbedtls_fprintf( stderr, "File too short to be encrypted.\n" );
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goto exit;
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}
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if( ( ( filesize - mbedtls_md_get_size( md_info ) ) %
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mbedtls_cipher_get_block_size( &cipher_ctx ) ) != 0 )
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{
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mbedtls_fprintf( stderr, "File content not a multiple of the block size (%d).\n",
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mbedtls_cipher_get_block_size( &cipher_ctx ));
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goto exit;
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}
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/*
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* Subtract the IV + HMAC length.
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*/
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filesize -= ( 16 + mbedtls_md_get_size( md_info ) );
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/*
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* Read the IV and original filesize modulo 16.
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*/
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if( fread( buffer, 1, 16, fin ) != 16 )
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{
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mbedtls_fprintf( stderr, "fread(%d bytes) failed\n", 16 );
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goto exit;
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}
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memcpy( IV, buffer, 16 );
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lastn = IV[15] & 0x0F;
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/*
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* Hash the IV and the secret key together 8192 times
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* using the result to setup the AES context and HMAC.
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*/
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memset( digest, 0, 32 );
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memcpy( digest, IV, 16 );
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for( i = 0; i < 8192; i++ )
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{
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mbedtls_md_starts( &md_ctx );
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mbedtls_md_update( &md_ctx, digest, 32 );
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mbedtls_md_update( &md_ctx, key, keylen );
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mbedtls_md_finish( &md_ctx, digest );
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}
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memset( key, 0, sizeof( key ) );
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if( mbedtls_cipher_setkey( &cipher_ctx, digest, cipher_info->key_bitlen,
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MBEDTLS_DECRYPT ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_setkey() returned error\n" );
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goto exit;
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}
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if( mbedtls_cipher_set_iv( &cipher_ctx, IV, 16 ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_set_iv() returned error\n" );
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goto exit;
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}
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if( mbedtls_cipher_reset( &cipher_ctx ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_reset() returned error\n" );
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goto exit;
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}
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mbedtls_md_hmac_starts( &md_ctx, digest, 32 );
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/*
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* Decrypt and write the plaintext.
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*/
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for( offset = 0; offset < filesize; offset += mbedtls_cipher_get_block_size( &cipher_ctx ) )
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{
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if( fread( buffer, 1, mbedtls_cipher_get_block_size( &cipher_ctx ), fin ) !=
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(size_t) mbedtls_cipher_get_block_size( &cipher_ctx ) )
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{
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mbedtls_fprintf( stderr, "fread(%d bytes) failed\n",
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mbedtls_cipher_get_block_size( &cipher_ctx ) );
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goto exit;
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}
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mbedtls_md_hmac_update( &md_ctx, buffer, mbedtls_cipher_get_block_size( &cipher_ctx ) );
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if( mbedtls_cipher_update( &cipher_ctx, buffer,
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mbedtls_cipher_get_block_size( &cipher_ctx ),
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output, &olen ) != 0 )
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{
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mbedtls_fprintf( stderr, "mbedtls_cipher_update() returned error\n" );
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goto exit;
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}
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if( fwrite( output, 1, olen, fout ) != olen )
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{
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mbedtls_fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
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goto exit;
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}
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}
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/*
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* Verify the message authentication code.
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*/
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mbedtls_md_hmac_finish( &md_ctx, digest );
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if( fread( buffer, 1, mbedtls_md_get_size( md_info ), fin ) != mbedtls_md_get_size( md_info ) )
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{
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mbedtls_fprintf( stderr, "fread(%d bytes) failed\n", mbedtls_md_get_size( md_info ) );
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goto exit;
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}
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/* Use constant-time buffer comparison */
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diff = 0;
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for( i = 0; i < mbedtls_md_get_size( md_info ); i++ )
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diff |= digest[i] ^ buffer[i];
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if( diff != 0 )
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{
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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;
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
exit:
|
|
if( fin )
|
|
fclose( fin );
|
|
if( fout )
|
|
fclose( fout );
|
|
|
|
memset( buffer, 0, sizeof( buffer ) );
|
|
memset( digest, 0, sizeof( digest ) );
|
|
|
|
mbedtls_cipher_free( &cipher_ctx );
|
|
mbedtls_md_free( &md_ctx );
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_C && MBEDTLS_MD_C && MBEDTLS_FS_IO */
|