1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "des_local.h"
11
12void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
13 long length, DES_key_schedule *schedule,
14 DES_cblock *ivec, int enc)
15{
16 register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1;
17 DES_LONG tin[2];
18 const unsigned char *in;
19 unsigned char *out, *iv;
20
21 in = input;
22 out = output;
23 iv = &(*ivec)[0];
24
25 if (enc) {
26 c2l(iv, xor0);
27 c2l(iv, xor1);
28 for (; length > 0; length -= 8) {
29 if (length >= 8) {
30 c2l(in, sin0);
31 c2l(in, sin1);
32 } else
33 c2ln(in, sin0, sin1, length);
34 tin[0] = sin0 ^ xor0;
35 tin[1] = sin1 ^ xor1;
36 DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
37 tout0 = tin[0];
38 tout1 = tin[1];
39 xor0 = sin0 ^ tout0;
40 xor1 = sin1 ^ tout1;
41 l2c(tout0, out);
42 l2c(tout1, out);
43 }
44 } else {
45 c2l(iv, xor0);
46 c2l(iv, xor1);
47 for (; length > 0; length -= 8) {
48 c2l(in, sin0);
49 c2l(in, sin1);
50 tin[0] = sin0;
51 tin[1] = sin1;
52 DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT);
53 tout0 = tin[0] ^ xor0;
54 tout1 = tin[1] ^ xor1;
55 if (length >= 8) {
56 l2c(tout0, out);
57 l2c(tout1, out);
58 } else
59 l2cn(tout0, tout1, out, length);
60 xor0 = tout0 ^ sin0;
61 xor1 = tout1 ^ sin1;
62 }
63 }
64 tin[0] = tin[1] = 0;
65 sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0;
66}
67