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- /*
- * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (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
- */
- /*-
- * #included by:
- * cbc_enc.c (DES_cbc_encrypt)
- * des_enc.c (DES_ncbc_encrypt)
- */
- #include "des_locl.h"
- #ifdef CBC_ENC_C__DONT_UPDATE_IV
- void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
- DES_key_schedule *_schedule, DES_cblock *ivec, int enc)
- #else
- void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out,
- long length, DES_key_schedule *_schedule,
- DES_cblock *ivec, int enc)
- #endif
- {
- register DES_LONG tin0, tin1;
- register DES_LONG tout0, tout1, xor0, xor1;
- register long l = length;
- DES_LONG tin[2];
- unsigned char *iv;
- iv = &(*ivec)[0];
- if (enc) {
- c2l(iv, tout0);
- c2l(iv, tout1);
- for (l -= 8; l >= 0; l -= 8) {
- c2l(in, tin0);
- c2l(in, tin1);
- tin0 ^= tout0;
- tin[0] = tin0;
- tin1 ^= tout1;
- tin[1] = tin1;
- DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
- tout0 = tin[0];
- l2c(tout0, out);
- tout1 = tin[1];
- l2c(tout1, out);
- }
- if (l != -8) {
- c2ln(in, tin0, tin1, l + 8);
- tin0 ^= tout0;
- tin[0] = tin0;
- tin1 ^= tout1;
- tin[1] = tin1;
- DES_encrypt1((DES_LONG *)tin, _schedule, DES_ENCRYPT);
- tout0 = tin[0];
- l2c(tout0, out);
- tout1 = tin[1];
- l2c(tout1, out);
- }
- #ifndef CBC_ENC_C__DONT_UPDATE_IV
- iv = &(*ivec)[0];
- l2c(tout0, iv);
- l2c(tout1, iv);
- #endif
- } else {
- c2l(iv, xor0);
- c2l(iv, xor1);
- for (l -= 8; l >= 0; l -= 8) {
- c2l(in, tin0);
- tin[0] = tin0;
- c2l(in, tin1);
- tin[1] = tin1;
- DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
- tout0 = tin[0] ^ xor0;
- tout1 = tin[1] ^ xor1;
- l2c(tout0, out);
- l2c(tout1, out);
- xor0 = tin0;
- xor1 = tin1;
- }
- if (l != -8) {
- c2l(in, tin0);
- tin[0] = tin0;
- c2l(in, tin1);
- tin[1] = tin1;
- DES_encrypt1((DES_LONG *)tin, _schedule, DES_DECRYPT);
- tout0 = tin[0] ^ xor0;
- tout1 = tin[1] ^ xor1;
- l2cn(tout0, tout1, out, l + 8);
- #ifndef CBC_ENC_C__DONT_UPDATE_IV
- xor0 = tin0;
- xor1 = tin1;
- #endif
- }
- #ifndef CBC_ENC_C__DONT_UPDATE_IV
- iv = &(*ivec)[0];
- l2c(xor0, iv);
- l2c(xor1, iv);
- #endif
- }
- tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
- tin[0] = tin[1] = 0;
- }
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