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