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/* $OpenBSD: cbc_cksm.c,v 1.7 2014/10/28 07:35:58 jsg Exp $ */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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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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DES_LONG tout0,tout1,tin0,tin1; |
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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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✓✓ |
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for (; l>0; l-=8) |
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{ |
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✓✓ |
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if (l >= 8) |
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{ |
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c2l(in,tin0); |
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c2l(in,tin1); |
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} |
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else |
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✗✗✗✗
✓✓✓✓
✓ |
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c2ln(in,tin0,tin1,l); |
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tin0^=tout0; tin[0]=tin0; |
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tin1^=tout1; tin[1]=tin1; |
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DES_encrypt1((DES_LONG *)tin,schedule,DES_ENCRYPT); |
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/* fix 15/10/91 eay - thanks to keithr@sco.COM */ |
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tout0=tin[0]; |
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tout1=tin[1]; |
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} |
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✓✗ |
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if (out != NULL) |
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{ |
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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 |
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match the return value that the MIT Kerberos |
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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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} |