1 /*
2 * Copyright 1995-2020 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 /*
11 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14 #include "internal/deprecated.h"
15
16 #include "des_local.h"
17
18 /*
19 * The input and output encrypted as though 64bit ofb mode is being used.
20 * The extra state information to record how much of the 64bit block we have
21 * used is contained in *num;
22 */
DES_ede3_ofb64_encrypt(register const unsigned char * in,register unsigned char * out,long length,DES_key_schedule * k1,DES_key_schedule * k2,DES_key_schedule * k3,DES_cblock * ivec,int * num)23 void DES_ede3_ofb64_encrypt(register const unsigned char *in,
24 register unsigned char *out, long length,
25 DES_key_schedule *k1, DES_key_schedule *k2,
26 DES_key_schedule *k3, DES_cblock *ivec, int *num)
27 {
28 register DES_LONG v0, v1;
29 register int n = *num;
30 register long l = length;
31 DES_cblock d;
32 register char *dp;
33 DES_LONG ti[2];
34 unsigned char *iv;
35 int save = 0;
36
37 iv = &(*ivec)[0];
38 c2l(iv, v0);
39 c2l(iv, v1);
40 ti[0] = v0;
41 ti[1] = v1;
42 dp = (char *)d;
43 l2c(v0, dp);
44 l2c(v1, dp);
45 while (l--) {
46 if (n == 0) {
47 /* ti[0]=v0; */
48 /* ti[1]=v1; */
49 DES_encrypt3(ti, k1, k2, k3);
50 v0 = ti[0];
51 v1 = ti[1];
52
53 dp = (char *)d;
54 l2c(v0, dp);
55 l2c(v1, dp);
56 save++;
57 }
58 *(out++) = *(in++) ^ d[n];
59 n = (n + 1) & 0x07;
60 }
61 if (save) {
62 iv = &(*ivec)[0];
63 l2c(v0, iv);
64 l2c(v1, iv);
65 }
66 v0 = v1 = ti[0] = ti[1] = 0;
67 *num = n;
68 }
69
