A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* DES low level APIs are deprecated for public use, but still ok for internal
* use.
*/
#include "internal/deprecated.h"
#include "des_local.h"
DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output,
long length, DES_key_schedule *schedule,
const_DES_cblock *ivec)
{
register DES_LONG tout0, tout1, tin0, tin1;
register long l = length;
DES_LONG tin[2];
unsigned char *out = &(*output)[0];
const unsigned char *iv = &(*ivec)[0];
c2l(iv, tout0);
c2l(iv, tout1);
for (; l > 0; l -= 8) {
if (l >= 8) {
c2l(in, tin0);
c2l(in, tin1);
} else
c2ln(in, tin0, tin1, l);
tin0 ^= tout0;
tin[0] = tin0;
tin1 ^= tout1;
tin[1] = tin1;
DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
tout0 = tin[0];
tout1 = tin[1];
}
if (out != NULL) {
l2c(tout0, out);
l2c(tout1, out);
}
tout0 = tin0 = tin1 = tin[0] = tin[1] = 0;
/*
* Transform the data in tout1 so that it will match the return value
* that the MIT Kerberos mit_des_cbc_cksum API returns.
*/
tout1 = ((tout1 >> 24L) & 0x000000FF)
| ((tout1 >> 8L) & 0x0000FF00)
| ((tout1 << 8L) & 0x00FF0000)
| ((tout1 << 24L) & 0xFF000000);
return tout1;
}