2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
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
11 * DES low level APIs are deprecated for public use, but still ok for internal
14 #include "internal/deprecated.h"
16 #include "des_local.h"
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)
22 register DES_LONG tout0, tout1, tin0, tin1;
23 register long l = length;
25 unsigned char *out = &(*output)[0];
26 const unsigned char *iv = &(*ivec)[0];
30 for (; l > 0; l -= 8) {
35 c2ln(in, tin0, tin1, l);
41 DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
49 tout0 = tin0 = tin1 = tin[0] = tin[1] = 0;
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.
54 tout1 = ((tout1 >> 24L) & 0x000000FF)
55 | ((tout1 >> 8L) & 0x0000FF00)
56 | ((tout1 << 8L) & 0x00FF0000)
57 | ((tout1 << 24L) & 0xFF000000);