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d2e9e320 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
0f113f3e | 3 | * |
2d48d5dd | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
d2e9e320 RS |
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 | ||
706457b7 | 10 | #include "des_local.h" |
d02b48c6 | 11 | |
0f113f3e MC |
12 | /* |
13 | * The input and output encrypted as though 64bit cfb 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 RE |
16 | */ |
17 | ||
c2e4f17c | 18 | void DES_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
0f113f3e MC |
19 | long length, DES_key_schedule *schedule, |
20 | DES_cblock *ivec, int *num, int enc) | |
21 | { | |
22 | register DES_LONG v0, v1; | |
23 | register long l = length; | |
24 | register int n = *num; | |
25 | DES_LONG ti[2]; | |
26 | unsigned char *iv, c, cc; | |
d02b48c6 | 27 | |
0f113f3e MC |
28 | iv = &(*ivec)[0]; |
29 | if (enc) { | |
30 | while (l--) { | |
31 | if (n == 0) { | |
32 | c2l(iv, v0); | |
33 | ti[0] = v0; | |
34 | c2l(iv, v1); | |
35 | ti[1] = v1; | |
36 | DES_encrypt1(ti, schedule, DES_ENCRYPT); | |
37 | iv = &(*ivec)[0]; | |
38 | v0 = ti[0]; | |
39 | l2c(v0, iv); | |
40 | v0 = ti[1]; | |
41 | l2c(v0, iv); | |
42 | iv = &(*ivec)[0]; | |
43 | } | |
44 | c = *(in++) ^ iv[n]; | |
45 | *(out++) = c; | |
46 | iv[n] = c; | |
47 | n = (n + 1) & 0x07; | |
48 | } | |
49 | } else { | |
50 | while (l--) { | |
51 | if (n == 0) { | |
52 | c2l(iv, v0); | |
53 | ti[0] = v0; | |
54 | c2l(iv, v1); | |
55 | ti[1] = v1; | |
56 | DES_encrypt1(ti, schedule, DES_ENCRYPT); | |
57 | iv = &(*ivec)[0]; | |
58 | v0 = ti[0]; | |
59 | l2c(v0, iv); | |
60 | v0 = ti[1]; | |
61 | l2c(v0, iv); | |
62 | iv = &(*ivec)[0]; | |
63 | } | |
64 | cc = *(in++); | |
65 | c = iv[n]; | |
66 | iv[n] = cc; | |
67 | *(out++) = c ^ cc; | |
68 | n = (n + 1) & 0x07; | |
69 | } | |
70 | } | |
71 | v0 = v1 = ti[0] = ti[1] = c = cc = 0; | |
72 | *num = n; | |
73 | } |