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/*
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* Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/crypto.h>
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#include "modes_local.h"
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#include <string.h>
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#if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC)
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# define STRICT_ALIGNMENT 0
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#endif
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void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], block128_f block)
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{
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size_t n;
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const unsigned char *iv = ivec;
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if (len == 0)
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return;
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#if !defined(OPENSSL_SMALL_FOOTPRINT)
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if (STRICT_ALIGNMENT &&
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((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
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while (len >= 16) {
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for (n = 0; n < 16; ++n)
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out[n] = in[n] ^ iv[n];
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(*block) (out, out, key);
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iv = out;
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len -= 16;
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in += 16;
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out += 16;
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}
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} else {
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while (len >= 16) {
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for (n = 0; n < 16; n += sizeof(size_t))
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*(size_t *)(out + n) =
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*(size_t *)(in + n) ^ *(size_t *)(iv + n);
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(*block) (out, out, key);
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iv = out;
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len -= 16;
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in += 16;
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out += 16;
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}
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}
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#endif
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while (len) {
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for (n = 0; n < 16 && n < len; ++n)
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out[n] = in[n] ^ iv[n];
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for (; n < 16; ++n)
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out[n] = iv[n];
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(*block) (out, out, key);
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iv = out;
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if (len <= 16)
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break;
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len -= 16;
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in += 16;
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out += 16;
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}
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memcpy(ivec, iv, 16);
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}
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void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out,
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size_t len, const void *key,
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unsigned char ivec[16], block128_f block)
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{
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size_t n;
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union {
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size_t t[16 / sizeof(size_t)];
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unsigned char c[16];
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} tmp;
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if (len == 0)
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return;
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#if !defined(OPENSSL_SMALL_FOOTPRINT)
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if (in != out) {
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const unsigned char *iv = ivec;
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if (STRICT_ALIGNMENT &&
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((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
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while (len >= 16) {
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(*block) (in, out, key);
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for (n = 0; n < 16; ++n)
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out[n] ^= iv[n];
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iv = in;
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len -= 16;
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in += 16;
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out += 16;
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}
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} else if (16 % sizeof(size_t) == 0) { /* always true */
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while (len >= 16) {
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size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv;
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(*block) (in, out, key);
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for (n = 0; n < 16 / sizeof(size_t); n++)
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out_t[n] ^= iv_t[n];
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iv = in;
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len -= 16;
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in += 16;
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out += 16;
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}
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}
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memcpy(ivec, iv, 16);
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} else {
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if (STRICT_ALIGNMENT &&
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((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
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unsigned char c;
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while (len >= 16) {
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(*block) (in, tmp.c, key);
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for (n = 0; n < 16; ++n) {
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c = in[n];
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out[n] = tmp.c[n] ^ ivec[n];
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ivec[n] = c;
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}
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len -= 16;
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in += 16;
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out += 16;
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}
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} else if (16 % sizeof(size_t) == 0) { /* always true */
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while (len >= 16) {
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size_t c, *out_t = (size_t *)out, *ivec_t = (size_t *)ivec;
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const size_t *in_t = (const size_t *)in;
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(*block) (in, tmp.c, key);
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for (n = 0; n < 16 / sizeof(size_t); n++) {
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c = in_t[n];
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out_t[n] = tmp.t[n] ^ ivec_t[n];
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ivec_t[n] = c;
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}
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len -= 16;
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in += 16;
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out += 16;
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}
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}
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}
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#endif
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while (len) {
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unsigned char c;
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(*block) (in, tmp.c, key);
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for (n = 0; n < 16 && n < len; ++n) {
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c = in[n];
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out[n] = tmp.c[n] ^ ivec[n];
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ivec[n] = c;
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}
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if (len <= 16) {
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for (; n < 16; ++n)
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ivec[n] = in[n];
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break;
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}
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len -= 16;
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in += 16;
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out += 16;
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}
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}
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