diff options
Diffstat (limited to 'gpxe/src/crypto/cbc.c')
-rw-r--r-- | gpxe/src/crypto/cbc.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/gpxe/src/crypto/cbc.c b/gpxe/src/crypto/cbc.c deleted file mode 100644 index 1710203c..00000000 --- a/gpxe/src/crypto/cbc.c +++ /dev/null @@ -1,101 +0,0 @@ -/* - * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>. - * - * 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -#include <string.h> -#include <assert.h> -#include <gpxe/crypto.h> -#include <gpxe/cbc.h> - -/** @file - * - * Cipher-block chaining - * - */ - -/** - * XOR data blocks - * - * @v src Input data - * @v dst Second input data and output data buffer - * @v len Length of data - */ -static void cbc_xor ( const void *src, void *dst, size_t len ) { - const uint32_t *srcl = src; - uint32_t *dstl = dst; - unsigned int i; - - /* Assume that block sizes will always be dword-aligned, for speed */ - assert ( ( len % sizeof ( *srcl ) ) == 0 ); - - for ( i = 0 ; i < ( len / sizeof ( *srcl ) ) ; i++ ) - dstl[i] ^= srcl[i]; -} - -/** - * Encrypt data - * - * @v ctx Context - * @v src Data to encrypt - * @v dst Buffer for encrypted data - * @v len Length of data - * @v raw_cipher Underlying cipher algorithm - * @v cbc_ctx CBC context - */ -void cbc_encrypt ( void *ctx, const void *src, void *dst, size_t len, - struct cipher_algorithm *raw_cipher, void *cbc_ctx ) { - size_t blocksize = raw_cipher->blocksize; - - assert ( ( len % blocksize ) == 0 ); - - while ( len ) { - cbc_xor ( src, cbc_ctx, blocksize ); - cipher_encrypt ( raw_cipher, ctx, cbc_ctx, dst, blocksize ); - memcpy ( cbc_ctx, dst, blocksize ); - dst += blocksize; - src += blocksize; - len -= blocksize; - } -} - -/** - * Decrypt data - * - * @v ctx Context - * @v src Data to decrypt - * @v dst Buffer for decrypted data - * @v len Length of data - * @v raw_cipher Underlying cipher algorithm - * @v cbc_ctx CBC context - */ -void cbc_decrypt ( void *ctx, const void *src, void *dst, size_t len, - struct cipher_algorithm *raw_cipher, void *cbc_ctx ) { - size_t blocksize = raw_cipher->blocksize; - - assert ( ( len % blocksize ) == 0 ); - - while ( len ) { - cipher_decrypt ( raw_cipher, ctx, src, dst, blocksize ); - cbc_xor ( cbc_ctx, dst, blocksize ); - memcpy ( cbc_ctx, src, blocksize ); - dst += blocksize; - src += blocksize; - len -= blocksize; - } -} |