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
12/*
13 * The input and output encrypted as though 64bit ofb mode is being used.
14 * The extra state information to record how much of the 64bit block we have
15 * used is contained in *num;
16 */
17void DES_ede3_ofb64_encrypt(register const unsigned char *in,
18 register unsigned char *out, long length,
19 DES_key_schedule *k1, DES_key_schedule *k2,
20 DES_key_schedule *k3, DES_cblock *ivec, int *num)
21{
22 register DES_LONG v0, v1;
23 register int n = *num;
24 register long l = length;
25 DES_cblock d;
26 register char *dp;
27 DES_LONG ti[2];
28 unsigned char *iv;
29 int save = 0;
30
31 iv = &(*ivec)[0];
32 c2l(iv, v0);
33 c2l(iv, v1);
34 ti[0] = v0;
35 ti[1] = v1;
36 dp = (char *)d;
37 l2c(v0, dp);
38 l2c(v1, dp);
39 while (l--) {
40 if (n == 0) {
41 /* ti[0]=v0; */
42 /* ti[1]=v1; */
43 DES_encrypt3(ti, k1, k2, k3);
44 v0 = ti[0];
45 v1 = ti[1];
46
47 dp = (char *)d;
48 l2c(v0, dp);
49 l2c(v1, dp);
50 save++;
51 }
52 *(out++) = *(in++) ^ d[n];
53 n = (n + 1) & 0x07;
54 }
55 if (save) {
56 iv = &(*ivec)[0];
57 l2c(v0, iv);
58 l2c(v1, iv);
59 }
60 v0 = v1 = ti[0] = ti[1] = 0;
61 *num = n;
62}
63