]>
Commit | Line | Data |
---|---|---|
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 <openssl/blowfish.h> | |
11 | #include "bf_local.h" | |
12 | ||
13 | /* | |
14 | * The input and output encrypted as though 64bit cfb mode is being used. | |
15 | * The extra state information to record how much of the 64bit block we have | |
16 | * used is contained in *num; | |
17 | */ | |
18 | ||
19 | void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out, | |
20 | long length, const BF_KEY *schedule, | |
21 | unsigned char *ivec, int *num, int encrypt) | |
22 | { | |
23 | register BF_LONG v0, v1, t; | |
24 | register int n = *num; | |
25 | register long l = length; | |
26 | BF_LONG ti[2]; | |
27 | unsigned char *iv, c, cc; | |
28 | ||
29 | iv = (unsigned char *)ivec; | |
30 | if (encrypt) { | |
31 | while (l--) { | |
32 | if (n == 0) { | |
33 | n2l(iv, v0); | |
34 | ti[0] = v0; | |
35 | n2l(iv, v1); | |
36 | ti[1] = v1; | |
37 | BF_encrypt((BF_LONG *)ti, schedule); | |
38 | iv = (unsigned char *)ivec; | |
39 | t = ti[0]; | |
40 | l2n(t, iv); | |
41 | t = ti[1]; | |
42 | l2n(t, iv); | |
43 | iv = (unsigned char *)ivec; | |
44 | } | |
45 | c = *(in++) ^ iv[n]; | |
46 | *(out++) = c; | |
47 | iv[n] = c; | |
48 | n = (n + 1) & 0x07; | |
49 | } | |
50 | } else { | |
51 | while (l--) { | |
52 | if (n == 0) { | |
53 | n2l(iv, v0); | |
54 | ti[0] = v0; | |
55 | n2l(iv, v1); | |
56 | ti[1] = v1; | |
57 | BF_encrypt((BF_LONG *)ti, schedule); | |
58 | iv = (unsigned char *)ivec; | |
59 | t = ti[0]; | |
60 | l2n(t, iv); | |
61 | t = ti[1]; | |
62 | l2n(t, iv); | |
63 | iv = (unsigned char *)ivec; | |
64 | } | |
65 | cc = *(in++); | |
66 | c = iv[n]; | |
67 | iv[n] = cc; | |
68 | *(out++) = c ^ cc; | |
69 | n = (n + 1) & 0x07; | |
70 | } | |
71 | } | |
72 | v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; | |
73 | *num = n; | |
74 | } |