/* 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
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* 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/)"
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* 5. Products derived from this software may not be called "OpenSSL"
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* 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/)"
*
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* ====================================================================
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*/
#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);
}
}
}
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