66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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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_locl.h"
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void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
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long length, DES_key_schedule *schedule,
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DES_cblock *ivec, int enc)
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{
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register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1;
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DES_LONG tin[2];
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const unsigned char *in;
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unsigned char *out, *iv;
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in = input;
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out = output;
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iv = &(*ivec)[0];
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if (enc) {
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c2l(iv, xor0);
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c2l(iv, xor1);
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for (; length > 0; length -= 8) {
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if (length >= 8) {
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c2l(in, sin0);
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c2l(in, sin1);
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} else
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c2ln(in, sin0, sin1, length);
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tin[0] = sin0 ^ xor0;
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tin[1] = sin1 ^ xor1;
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DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
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tout0 = tin[0];
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tout1 = tin[1];
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xor0 = sin0 ^ tout0;
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xor1 = sin1 ^ tout1;
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l2c(tout0, out);
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l2c(tout1, out);
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}
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} else {
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c2l(iv, xor0);
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c2l(iv, xor1);
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for (; length > 0; length -= 8) {
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c2l(in, sin0);
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c2l(in, sin1);
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tin[0] = sin0;
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tin[1] = sin1;
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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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if (length >= 8) {
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l2c(tout0, out);
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l2c(tout1, out);
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} else
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l2cn(tout0, tout1, out, length);
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xor0 = tout0 ^ sin0;
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xor1 = tout1 ^ sin1;
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}
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}
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tin[0] = tin[1] = 0;
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sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0;
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}
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