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Commit | Line | Data |
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b1322259 | 1 | /* |
33388b44 | 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
0f113f3e | 3 | * |
8b00b7b8 | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
b1322259 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 | ||
03047e7b MC |
10 | /* |
11 | * BF low level APIs are deprecated for public use, but still ok for internal | |
12 | * use. | |
13 | */ | |
14 | #include "internal/deprecated.h" | |
15 | ||
ec577822 | 16 | #include <openssl/blowfish.h> |
706457b7 | 17 | #include "bf_local.h" |
d02b48c6 | 18 | |
0f113f3e MC |
19 | /* |
20 | * The input and output encrypted as though 64bit cfb mode is being used. | |
21 | * The extra state information to record how much of the 64bit block we have | |
22 | * used is contained in *num; | |
d02b48c6 RE |
23 | */ |
24 | ||
0f113f3e MC |
25 | void BF_cfb64_encrypt(const unsigned char *in, unsigned char *out, |
26 | long length, const BF_KEY *schedule, | |
27 | unsigned char *ivec, int *num, int encrypt) | |
28 | { | |
29 | register BF_LONG v0, v1, t; | |
30 | register int n = *num; | |
31 | register long l = length; | |
32 | BF_LONG ti[2]; | |
33 | unsigned char *iv, c, cc; | |
d02b48c6 | 34 | |
0f113f3e MC |
35 | iv = (unsigned char *)ivec; |
36 | if (encrypt) { | |
37 | while (l--) { | |
38 | if (n == 0) { | |
39 | n2l(iv, v0); | |
40 | ti[0] = v0; | |
41 | n2l(iv, v1); | |
42 | ti[1] = v1; | |
43 | BF_encrypt((BF_LONG *)ti, schedule); | |
44 | iv = (unsigned char *)ivec; | |
45 | t = ti[0]; | |
46 | l2n(t, iv); | |
47 | t = ti[1]; | |
48 | l2n(t, iv); | |
49 | iv = (unsigned char *)ivec; | |
50 | } | |
51 | c = *(in++) ^ iv[n]; | |
52 | *(out++) = c; | |
53 | iv[n] = c; | |
54 | n = (n + 1) & 0x07; | |
55 | } | |
56 | } else { | |
57 | while (l--) { | |
58 | if (n == 0) { | |
59 | n2l(iv, v0); | |
60 | ti[0] = v0; | |
61 | n2l(iv, v1); | |
62 | ti[1] = v1; | |
63 | BF_encrypt((BF_LONG *)ti, schedule); | |
64 | iv = (unsigned char *)ivec; | |
65 | t = ti[0]; | |
66 | l2n(t, iv); | |
67 | t = ti[1]; | |
68 | l2n(t, iv); | |
69 | iv = (unsigned char *)ivec; | |
70 | } | |
71 | cc = *(in++); | |
72 | c = iv[n]; | |
73 | iv[n] = cc; | |
74 | *(out++) = c ^ cc; | |
75 | n = (n + 1) & 0x07; | |
76 | } | |
77 | } | |
78 | v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; | |
79 | *num = n; | |
80 | } |