173 lines
4.8 KiB
C
173 lines
4.8 KiB
C
/*
|
|
* Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include <openssl/crypto.h>
|
|
#include "crypto/modes.h"
|
|
|
|
#if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC)
|
|
# define STRICT_ALIGNMENT 0
|
|
#endif
|
|
|
|
#if defined(__GNUC__) && !STRICT_ALIGNMENT
|
|
typedef size_t size_t_aX __attribute((__aligned__(1)));
|
|
#else
|
|
typedef size_t size_t_aX;
|
|
#endif
|
|
|
|
void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
|
|
size_t len, const void *key,
|
|
unsigned char ivec[16], block128_f block)
|
|
{
|
|
size_t n;
|
|
const unsigned char *iv = ivec;
|
|
|
|
if (len == 0)
|
|
return;
|
|
|
|
#if !defined(OPENSSL_SMALL_FOOTPRINT)
|
|
if (STRICT_ALIGNMENT &&
|
|
((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
|
|
while (len >= 16) {
|
|
for (n = 0; n < 16; ++n)
|
|
out[n] = in[n] ^ iv[n];
|
|
(*block) (out, out, key);
|
|
iv = out;
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
} else {
|
|
while (len >= 16) {
|
|
for (n = 0; n < 16; n += sizeof(size_t))
|
|
*(size_t_aX *)(out + n) =
|
|
*(size_t_aX *)(in + n) ^ *(size_t_aX *)(iv + n);
|
|
(*block) (out, out, key);
|
|
iv = out;
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
}
|
|
#endif
|
|
while (len) {
|
|
for (n = 0; n < 16 && n < len; ++n)
|
|
out[n] = in[n] ^ iv[n];
|
|
for (; n < 16; ++n)
|
|
out[n] = iv[n];
|
|
(*block) (out, out, key);
|
|
iv = out;
|
|
if (len <= 16)
|
|
break;
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
if (ivec != iv)
|
|
memcpy(ivec, iv, 16);
|
|
}
|
|
|
|
void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
|
|
size_t len, const void *key,
|
|
unsigned char ivec[16], block128_f block)
|
|
{
|
|
size_t n;
|
|
union {
|
|
size_t t[16 / sizeof(size_t)];
|
|
unsigned char c[16];
|
|
} tmp;
|
|
|
|
if (len == 0)
|
|
return;
|
|
|
|
#if !defined(OPENSSL_SMALL_FOOTPRINT)
|
|
if (in != out) {
|
|
const unsigned char *iv = ivec;
|
|
|
|
if (STRICT_ALIGNMENT &&
|
|
((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
|
|
while (len >= 16) {
|
|
(*block) (in, out, key);
|
|
for (n = 0; n < 16; ++n)
|
|
out[n] ^= iv[n];
|
|
iv = in;
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
} else if (16 % sizeof(size_t) == 0) { /* always true */
|
|
while (len >= 16) {
|
|
size_t_aX *out_t = (size_t_aX *)out;
|
|
size_t_aX *iv_t = (size_t_aX *)iv;
|
|
|
|
(*block) (in, out, key);
|
|
for (n = 0; n < 16 / sizeof(size_t); n++)
|
|
out_t[n] ^= iv_t[n];
|
|
iv = in;
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
}
|
|
if (ivec != iv)
|
|
memcpy(ivec, iv, 16);
|
|
} else {
|
|
if (STRICT_ALIGNMENT &&
|
|
((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
|
|
unsigned char c;
|
|
while (len >= 16) {
|
|
(*block) (in, tmp.c, key);
|
|
for (n = 0; n < 16; ++n) {
|
|
c = in[n];
|
|
out[n] = tmp.c[n] ^ ivec[n];
|
|
ivec[n] = c;
|
|
}
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
} else if (16 % sizeof(size_t) == 0) { /* always true */
|
|
while (len >= 16) {
|
|
size_t c;
|
|
size_t_aX *out_t = (size_t_aX *)out;
|
|
size_t_aX *ivec_t = (size_t_aX *)ivec;
|
|
const size_t_aX *in_t = (const size_t_aX *)in;
|
|
|
|
(*block) (in, tmp.c, key);
|
|
for (n = 0; n < 16 / sizeof(size_t); n++) {
|
|
c = in_t[n];
|
|
out_t[n] = tmp.t[n] ^ ivec_t[n];
|
|
ivec_t[n] = c;
|
|
}
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
while (len) {
|
|
unsigned char c;
|
|
(*block) (in, tmp.c, key);
|
|
for (n = 0; n < 16 && n < len; ++n) {
|
|
c = in[n];
|
|
out[n] = tmp.c[n] ^ ivec[n];
|
|
ivec[n] = c;
|
|
}
|
|
if (len <= 16) {
|
|
for (; n < 16; ++n)
|
|
ivec[n] = in[n];
|
|
break;
|
|
}
|
|
len -= 16;
|
|
in += 16;
|
|
out += 16;
|
|
}
|
|
}
|