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d2e9e320 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
0f113f3e | 3 | * |
d2e9e320 RS |
4 | * Licensed under the OpenSSL license (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 | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include "des_locl.h" | |
11 | ||
0f113f3e MC |
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; | |
d02b48c6 | 16 | */ |
c2e4f17c | 17 | void DES_ofb64_encrypt(register const unsigned char *in, |
0f113f3e MC |
18 | register unsigned char *out, long length, |
19 | DES_key_schedule *schedule, DES_cblock *ivec, int *num) | |
20 | { | |
21 | register DES_LONG v0, v1, t; | |
22 | register int n = *num; | |
23 | register long l = length; | |
24 | DES_cblock d; | |
25 | register unsigned char *dp; | |
26 | DES_LONG ti[2]; | |
27 | unsigned char *iv; | |
28 | int save = 0; | |
d02b48c6 | 29 | |
0f113f3e MC |
30 | iv = &(*ivec)[0]; |
31 | c2l(iv, v0); | |
32 | c2l(iv, v1); | |
33 | ti[0] = v0; | |
34 | ti[1] = v1; | |
35 | dp = d; | |
36 | l2c(v0, dp); | |
37 | l2c(v1, dp); | |
38 | while (l--) { | |
39 | if (n == 0) { | |
40 | DES_encrypt1(ti, schedule, DES_ENCRYPT); | |
41 | dp = d; | |
42 | t = ti[0]; | |
43 | l2c(t, dp); | |
44 | t = ti[1]; | |
45 | l2c(t, dp); | |
46 | save++; | |
47 | } | |
48 | *(out++) = *(in++) ^ d[n]; | |
49 | n = (n + 1) & 0x07; | |
50 | } | |
51 | if (save) { | |
52 | v0 = ti[0]; | |
53 | v1 = ti[1]; | |
54 | iv = &(*ivec)[0]; | |
55 | l2c(v0, iv); | |
56 | l2c(v1, iv); | |
57 | } | |
58 | t = v0 = v1 = ti[0] = ti[1] = 0; | |
59 | *num = n; | |
60 | } |