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