104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
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/*
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* Copyright 1995-2016 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 "des_local.h"
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/* RSA's DESX */
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void DES_xcbc_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, const_DES_cblock *inw,
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const_DES_cblock *outw, int enc)
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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 DES_LONG inW0, inW1, outW0, outW1;
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register const unsigned char *in2;
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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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in2 = &(*inw)[0];
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c2l(in2, inW0);
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c2l(in2, inW1);
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in2 = &(*outw)[0];
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c2l(in2, outW0);
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c2l(in2, outW1);
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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 ^ inW0;
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tin[0] = tin0;
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tin1 ^= tout1 ^ inW1;
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tin[1] = tin1;
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DES_encrypt1(tin, schedule, DES_ENCRYPT);
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tout0 = tin[0] ^ outW0;
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l2c(tout0, out);
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tout1 = tin[1] ^ outW1;
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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 ^ inW0;
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tin[0] = tin0;
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tin1 ^= tout1 ^ inW1;
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tin[1] = tin1;
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DES_encrypt1(tin, schedule, DES_ENCRYPT);
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tout0 = tin[0] ^ outW0;
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l2c(tout0, out);
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tout1 = tin[1] ^ outW1;
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l2c(tout1, out);
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}
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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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} 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 ^ outW0;
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c2l(in, tin1);
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tin[1] = tin1 ^ outW1;
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DES_encrypt1(tin, schedule, DES_DECRYPT);
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tout0 = tin[0] ^ xor0 ^ inW0;
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tout1 = tin[1] ^ xor1 ^ inW1;
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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 ^ outW0;
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c2l(in, tin1);
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tin[1] = tin1 ^ outW1;
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DES_encrypt1(tin, schedule, DES_DECRYPT);
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tout0 = tin[0] ^ xor0 ^ inW0;
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tout1 = tin[1] ^ xor1 ^ inW1;
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l2cn(tout0, tout1, out, l + 8);
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xor0 = tin0;
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xor1 = tin1;
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}
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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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}
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tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
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inW0 = inW1 = outW0 = outW1 = 0;
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tin[0] = tin[1] = 0;
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}
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