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 ofb 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 | void BF_ofb64_encrypt(const unsigned char *in, unsigned char *out, |
19 | long length, const BF_KEY *schedule, |
20 | unsigned char *ivec, int *num) |
21 | { |
22 | register BF_LONG v0, v1, t; |
23 | register int n = *num; |
24 | register long l = length; |
25 | unsigned char d[8]; |
26 | register char *dp; |
27 | BF_LONG ti[2]; |
28 | unsigned char *iv; |
29 | int save = 0; |
30 | |
31 | iv = (unsigned char *)ivec; |
32 | n2l(iv, v0); |
33 | n2l(iv, v1); |
34 | ti[0] = v0; |
35 | ti[1] = v1; |
36 | dp = (char *)d; |
37 | l2n(v0, dp); |
38 | l2n(v1, dp); |
39 | while (l--) { |
40 | if (n == 0) { |
41 | BF_encrypt((BF_LONG *)ti, schedule); |
42 | dp = (char *)d; |
43 | t = ti[0]; |
44 | l2n(t, dp); |
45 | t = ti[1]; |
46 | l2n(t, dp); |
47 | save++; |
48 | } |
49 | *(out++) = *(in++) ^ d[n]; |
50 | n = (n + 1) & 0x07; |
51 | } |
52 | if (save) { |
53 | v0 = ti[0]; |
54 | v1 = ti[1]; |
55 | iv = (unsigned char *)ivec; |
56 | l2n(v0, iv); |
57 | l2n(v1, iv); |
58 | } |
59 | t = v0 = v1 = ti[0] = ti[1] = 0; |
60 | *num = n; |
61 | } |
62 | |