134 lines
4.5 KiB
C
134 lines
4.5 KiB
C
/* lib/des/qud_cksm.c */
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/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
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* All rights reserved.
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*
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* This file is part of an SSL implementation written
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* by Eric Young (eay@mincom.oz.au).
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* The implementation was written so as to conform with Netscapes SSL
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* specification. This library and applications are
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* FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
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* as long as the following conditions are aheared to.
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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. If this code is used in a product,
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* Eric Young should be given attribution as the author of the parts 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 software developed by Eric Young (eay@mincom.oz.au)
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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 B0(a) (((unsigned long)(a)))
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#define B1(a) (((unsigned long)(a))<<8)
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#define B2(a) (((unsigned long)(a))<<16)
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#define B3(a) (((unsigned 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 ((unsigned long)83653421L)
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unsigned long des_quad_cksum(input, output, length, out_count, seed)
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des_cblock (*input);
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des_cblock (*output);
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long length;
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int out_count;
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des_cblock (*seed);
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{
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unsigned long z0,z1,t0,t1;
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int i;
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long l=0;
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unsigned char *cp;
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unsigned char *lp;
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if (out_count < 1) out_count=1;
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lp=(unsigned char *)output;
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z0=B0((*seed)[0])|B1((*seed)[1])|B2((*seed)[2])|B3((*seed)[3]);
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z1=B0((*seed)[4])|B1((*seed)[5])|B2((*seed)[6])|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=(unsigned char *)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= (unsigned long)(*(cp++));
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t0|=(unsigned long)B1(*(cp++));
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l--;
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}
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else
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t0= (unsigned 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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/* I believe I finally have things worked out.
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* The MIT library assumes that the checksum
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* is one huge number and it is returned in a
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* host dependant byte order.
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*/
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static unsigned long ltmp=1;
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static unsigned char *c=(unsigned char *)<mp;
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if (c[0])
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{
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l2c(z0,lp);
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l2c(z1,lp);
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}
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else
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{
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lp=output[out_count-i-1];
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l2n(z1,lp);
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l2n(z0,lp);
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}
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}
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}
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return(z0);
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}
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