/* crypto/aes/aes_cbc.c -*- mode:C; c-file-style: "eay" -*- *//* ==================================================================== * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer.  * * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in *    the documentation and/or other materials provided with the *    distribution. * * 3. All advertising materials mentioning features or use of this *    software must display the following acknowledgment: *    "This product includes software developed by the OpenSSL Project *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to *    endorse or promote products derived from this software without *    prior written permission. For written permission, please contact *    openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" *    nor may "OpenSSL" appear in their names without prior written *    permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following *    acknowledgment: *    "This product includes software developed by the OpenSSL Project *    for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * */#ifndef AES_DEBUG# ifndef NDEBUG#  define NDEBUG# endif#endif#include <assert.h>#include <openssl/aes.h>#include "aes_locl.h"void AES_cbc_encrypt(const unsigned char *in, unsigned char *out,		     const unsigned long length, const AES_KEY *key,		     unsigned char *ivec, const int enc) {	unsigned long n;	unsigned long len = length;	unsigned char tmp[AES_BLOCK_SIZE];	const unsigned char *iv = ivec;	assert(in && out && key && ivec);	assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));	if (AES_ENCRYPT == enc) {		while (len >= AES_BLOCK_SIZE) {			for(n=0; n < AES_BLOCK_SIZE; ++n)				out[n] = in[n] ^ iv[n];			AES_encrypt(out, out, key);			iv = out;			len -= AES_BLOCK_SIZE;			in += AES_BLOCK_SIZE;			out += AES_BLOCK_SIZE;		}		if (len) {			for(n=0; n < len; ++n)				out[n] = in[n] ^ iv[n];			for(n=len; n < AES_BLOCK_SIZE; ++n)				out[n] = iv[n];			AES_encrypt(out, out, key);			iv = out;		}		memcpy(ivec,iv,AES_BLOCK_SIZE);	} else if (in != out) {		while (len >= AES_BLOCK_SIZE) {			AES_decrypt(in, out, key);			for(n=0; n < AES_BLOCK_SIZE; ++n)				out[n] ^= iv[n];			iv = in;			len -= AES_BLOCK_SIZE;			in  += AES_BLOCK_SIZE;			out += AES_BLOCK_SIZE;		}		if (len) {			AES_decrypt(in,tmp,key);			for(n=0; n < len; ++n)				out[n] = tmp[n] ^ iv[n];			iv = in;		}		memcpy(ivec,iv,AES_BLOCK_SIZE);	} else {		while (len >= AES_BLOCK_SIZE) {			memcpy(tmp, in, AES_BLOCK_SIZE);			AES_decrypt(in, out, key);			for(n=0; n < AES_BLOCK_SIZE; ++n)				out[n] ^= ivec[n];			memcpy(ivec, tmp, AES_BLOCK_SIZE);			len -= AES_BLOCK_SIZE;			in += AES_BLOCK_SIZE;			out += AES_BLOCK_SIZE;		}		if (len) {			memcpy(tmp, in, AES_BLOCK_SIZE);			AES_decrypt(tmp, out, key);			for(n=0; n < len; ++n)				out[n] ^= ivec[n];			for(n=len; n < AES_BLOCK_SIZE; ++n)				out[n] = tmp[n];			memcpy(ivec, tmp, AES_BLOCK_SIZE);		}	}}