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53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "des_locl.h"
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DES_LONG DES_cbc_cksum(const unsigned char *in, DES_cblock *output,
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long length, DES_key_schedule *schedule,
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const_DES_cblock *ivec)
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{
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register DES_LONG tout0, tout1, tin0, tin1;
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register long l = length;
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DES_LONG tin[2];
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unsigned char *out = &(*output)[0];
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const unsigned char *iv = &(*ivec)[0];
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c2l(iv, tout0);
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c2l(iv, tout1);
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for (; l > 0; l -= 8) {
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if (l >= 8) {
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c2l(in, tin0);
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c2l(in, tin1);
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} else
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c2ln(in, tin0, tin1, l);
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tin0 ^= tout0;
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tin[0] = tin0;
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tin1 ^= tout1;
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tin[1] = tin1;
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DES_encrypt1((DES_LONG *)tin, schedule, DES_ENCRYPT);
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tout0 = tin[0];
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tout1 = tin[1];
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}
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if (out != NULL) {
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l2c(tout0, out);
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l2c(tout1, out);
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}
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tout0 = tin0 = tin1 = tin[0] = tin[1] = 0;
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/*
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* Transform the data in tout1 so that it will match the return value
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* that the MIT Kerberos mit_des_cbc_cksum API returns.
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*/
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tout1 = ((tout1 >> 24L) & 0x000000FF)
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| ((tout1 >> 8L) & 0x0000FF00)
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| ((tout1 << 8L) & 0x00FF0000)
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| ((tout1 << 24L) & 0xFF000000);
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return tout1;
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}
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