| /* |
| * \brief Generic file encryption program using generic wrappers for configured |
| * security. |
| * |
| * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| * This file is part of mbed TLS (https://tls.mbed.org) |
| */ |
| |
| #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_fprintf fprintf |
| #define mbedtls_printf printf |
| #endif |
| |
| #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 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 and clean the 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 ); |
| } |
| } |
| |
| memset( argv[6], 0, strlen( argv[6] ) ); |
| |
| #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 ); |
| |
| } |
| |
| memset( key, 0, sizeof( key ) ); |
| |
| 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 ); |
| } |
| |
| memset( key, 0, sizeof( key ) ); |
| |
| 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; |
| } |
| } |
| |
| 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 */ |