1 /*
2 * Copyright 1995-2020 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 /*
11 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14 #include "internal/deprecated.h"
15
16 #include "des_local.h"
17
DES_cbc_cksum(const unsigned char * in,DES_cblock * output,long length,DES_key_schedule * schedule,const_DES_cblock * ivec)18 DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output,
19 long length, DES_key_schedule *schedule,
20 const_DES_cblock *ivec)
21 {
22 register DES_LONG tout0, tout1, tin0, tin1;
23 register long l = length;
24 DES_LONG tin[2];
25 unsigned char *out = &(*output)[0];
26 const unsigned char *iv = &(*ivec)[0];
27
28 c2l(iv, tout0);
29 c2l(iv, tout1);
30 for (; l > 0; l -= 8) {
31 if (l >= 8) {
32 c2l(in, tin0);
33 c2l(in, tin1);
34 } else
35 c2ln(in, tin0, tin1, l);
36
37 tin0 ^= tout0;
38 tin[0] = tin0;
39 tin1 ^= tout1;
40 tin[1] = tin1;
41 DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
42 tout0 = tin[0];
43 tout1 = tin[1];
44 }
45 if (out != NULL) {
46 l2c(tout0, out);
47 l2c(tout1, out);
48 }
49 tout0 = tin0 = tin1 = tin[0] = tin[1] = 0;
50 /*
51 * Transform the data in tout1 so that it will match the return value
52 * that the MIT Kerberos mit_des_cbc_cksum API returns.
53 */
54 tout1 = ((tout1 >> 24L) & 0x000000FF)
55 | ((tout1 >> 8L) & 0x0000FF00)
56 | ((tout1 << 8L) & 0x00FF0000)
57 | ((tout1 << 24L) & 0xFF000000);
58 return tout1;
59 }
60