GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/des/qud_cksm.c Lines: 21 21 100.0 %
Date: 2017-11-13 Branches: 8 12 66.7 %

Line Branch Exec Source
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/* $OpenBSD: qud_cksm.c,v 1.7 2014/06/12 15:49:28 deraadt 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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/* From "Message Authentication"  R.R. Jueneman, S.M. Matyas, C.H. Meyer
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 * IEEE Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40
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 * This module in only based on the code in this paper and is
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 * almost definitely not the same as the MIT implementation.
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 */
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#include "des_locl.h"
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/* bug fix for dos - 7/6/91 - Larry hughes@logos.ucs.indiana.edu */
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#define Q_B0(a)	(((DES_LONG)(a)))
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#define Q_B1(a)	(((DES_LONG)(a))<<8)
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#define Q_B2(a)	(((DES_LONG)(a))<<16)
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#define Q_B3(a)	(((DES_LONG)(a))<<24)
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/* used to scramble things a bit */
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/* Got the value MIT uses via brute force :-) 2/10/90 eay */
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#define NOISE	((DES_LONG)83653421L)
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DES_LONG DES_quad_cksum(const unsigned char *input, DES_cblock output[],
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	     long length, int out_count, DES_cblock *seed)
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	{
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	DES_LONG z0,z1,t0,t1;
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	int i;
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	long l;
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	const unsigned char *cp;
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	DES_LONG *lp;
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	if (out_count < 1) out_count=1;
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	lp = (DES_LONG *) &(output[0])[0];
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	z0=Q_B0((*seed)[0])|Q_B1((*seed)[1])|Q_B2((*seed)[2])|Q_B3((*seed)[3]);
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	z1=Q_B0((*seed)[4])|Q_B1((*seed)[5])|Q_B2((*seed)[6])|Q_B3((*seed)[7]);
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	for (i=0; ((i<4)&&(i<out_count)); i++)
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		{
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		cp=input;
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		l=length;
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		while (l > 0)
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			{
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			if (l > 1)
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				{
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				t0= (DES_LONG)(*(cp++));
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				t0|=(DES_LONG)Q_B1(*(cp++));
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				l--;
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				}
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			else
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				t0= (DES_LONG)(*(cp++));
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			l--;
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			/* add */
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			t0+=z0;
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			t0&=0xffffffffL;
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			t1=z1;
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			/* square, well sort of square */
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			z0=((((t0*t0)&0xffffffffL)+((t1*t1)&0xffffffffL))
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				&0xffffffffL)%0x7fffffffL;
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			z1=((t0*((t1+NOISE)&0xffffffffL))&0xffffffffL)%0x7fffffffL;
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			}
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		if (lp != NULL)
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			{
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			/* The MIT library assumes that the checksum is
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			 * composed of 2*out_count 32 bit ints */
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			*lp++ = z0;
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			*lp++ = z1;
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			}
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		}
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	return(z0);
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	}
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