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Commit | Line | Data |
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4f22f405 | 1 | /* |
33388b44 | 2 | * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved. |
d02b48c6 | 3 | * |
2d48d5dd | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
4f22f405 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 | ||
c6fec81b P |
10 | /* |
11 | * DES low level APIs are deprecated for public use, but still ok for internal | |
12 | * use. | |
13 | */ | |
14 | #include "internal/deprecated.h" | |
15 | ||
706457b7 | 16 | #include "des_local.h" |
d02b48c6 | 17 | |
c2e4f17c | 18 | void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output, |
0f113f3e MC |
19 | long length, DES_key_schedule *schedule, |
20 | DES_cblock *ivec, int enc) | |
21 | { | |
22 | register DES_LONG sin0, sin1, xor0, xor1, tout0, tout1; | |
23 | DES_LONG tin[2]; | |
24 | const unsigned char *in; | |
25 | unsigned char *out, *iv; | |
d02b48c6 | 26 | |
0f113f3e MC |
27 | in = input; |
28 | out = output; | |
29 | iv = &(*ivec)[0]; | |
d02b48c6 | 30 | |
0f113f3e MC |
31 | if (enc) { |
32 | c2l(iv, xor0); | |
33 | c2l(iv, xor1); | |
34 | for (; length > 0; length -= 8) { | |
35 | if (length >= 8) { | |
36 | c2l(in, sin0); | |
37 | c2l(in, sin1); | |
38 | } else | |
39 | c2ln(in, sin0, sin1, length); | |
40 | tin[0] = sin0 ^ xor0; | |
41 | tin[1] = sin1 ^ xor1; | |
42 | DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT); | |
43 | tout0 = tin[0]; | |
44 | tout1 = tin[1]; | |
45 | xor0 = sin0 ^ tout0; | |
46 | xor1 = sin1 ^ tout1; | |
47 | l2c(tout0, out); | |
48 | l2c(tout1, out); | |
49 | } | |
50 | } else { | |
51 | c2l(iv, xor0); | |
52 | c2l(iv, xor1); | |
53 | for (; length > 0; length -= 8) { | |
54 | c2l(in, sin0); | |
55 | c2l(in, sin1); | |
56 | tin[0] = sin0; | |
57 | tin[1] = sin1; | |
58 | DES_encrypt1((DES_LONG *)tin, schedule, DES_DECRYPT); | |
59 | tout0 = tin[0] ^ xor0; | |
60 | tout1 = tin[1] ^ xor1; | |
61 | if (length >= 8) { | |
62 | l2c(tout0, out); | |
63 | l2c(tout1, out); | |
64 | } else | |
65 | l2cn(tout0, tout1, out, length); | |
66 | xor0 = tout0 ^ sin0; | |
67 | xor1 = tout1 ^ sin1; | |
68 | } | |
69 | } | |
70 | tin[0] = tin[1] = 0; | |
71 | sin0 = sin1 = xor0 = xor1 = tout0 = tout1 = 0; | |
72 | } |