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 "des_local.h" |
11 | |
12 | DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output, |
13 | long length, DES_key_schedule *schedule, |
14 | const_DES_cblock *ivec) |
15 | { |
16 | register DES_LONG tout0, tout1, tin0, tin1; |
17 | register long l = length; |
18 | DES_LONG tin[2]; |
19 | unsigned char *out = &(*output)[0]; |
20 | const unsigned char *iv = &(*ivec)[0]; |
21 | |
22 | c2l(iv, tout0); |
23 | c2l(iv, tout1); |
24 | for (; l > 0; l -= 8) { |
25 | if (l >= 8) { |
26 | c2l(in, tin0); |
27 | c2l(in, tin1); |
28 | } else |
29 | c2ln(in, tin0, tin1, l); |
30 | |
31 | tin0 ^= tout0; |
32 | tin[0] = tin0; |
33 | tin1 ^= tout1; |
34 | tin[1] = tin1; |
35 | DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT); |
36 | tout0 = tin[0]; |
37 | tout1 = tin[1]; |
38 | } |
39 | if (out != NULL) { |
40 | l2c(tout0, out); |
41 | l2c(tout1, out); |
42 | } |
43 | tout0 = tin0 = tin1 = tin[0] = tin[1] = 0; |
44 | /* |
45 | * Transform the data in tout1 so that it will match the return value |
46 | * that the MIT Kerberos mit_des_cbc_cksum API returns. |
47 | */ |
48 | tout1 = ((tout1 >> 24L) & 0x000000FF) |
49 | | ((tout1 >> 8L) & 0x0000FF00) |
50 | | ((tout1 << 8L) & 0x00FF0000) |
51 | | ((tout1 << 24L) & 0xFF000000); |
52 | return tout1; |
53 | } |
54 | |