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141 lines
5.1 KiB
C
141 lines
5.1 KiB
C
/* crypto/des/qud_cksm.c */
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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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unsigned char *lp;
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if (out_count < 1) out_count=1;
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lp = &(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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/* 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 DES_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])[0];
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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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