/* crypto/aes/aes_cbc.c -*- mode:C; c-file-style: "eay" -*- */
/* ====================================================================
* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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* "This product includes software developed by the OpenSSL Project
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* ====================================================================
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*/
#include
#include
#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) {
int n;
unsigned long len = length;
unsigned char tmp[16];
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 < 16; ++n)
tmp[n] = in[n] ^ ivec[n];
AES_encrypt(tmp, out, key);
memcpy(ivec, out, 16);
len -= 16;
in += 16;
out += 16;
}
if (len) {
for(n=0; n < len; ++n)
tmp[n] = in[n] ^ ivec[n];
for(n=len; n < AES_BLOCK_SIZE; ++n)
tmp[n] = ivec[n];
AES_encrypt(tmp, tmp, key);
memcpy(out, tmp, len);
memcpy(ivec, tmp, 16);
}
} else {
while (len >= AES_BLOCK_SIZE) {
memcpy(tmp, in, 16);
AES_decrypt(in, out, key);
for(n=0; n < 16; ++n)
out[n] ^= ivec[n];
memcpy(ivec, tmp, 16);
len -= 16;
in += 16;
out += 16;
}
if (len) {
memcpy(tmp, in, 16);
AES_decrypt(tmp, tmp, key);
for(n=0; n < len; ++n)
out[n] ^= ivec[n];
memcpy(ivec, tmp, 16);
}
}
}