crypto/heimdal-0.6.3/lib/des/qud_cksm.c

   1 /* crypto/des/qud_cksm.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@mincom.oz.au).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@mincom.oz.au).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@mincom.oz.au)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@mincom.oz.au)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 /* From "Message Authentication"  R.R. Jueneman, S.M. Matyas, C.H. Meyer
  60  * IEEE Communications Magazine Sept 1985 Vol. 23 No. 9 p 29-40
  61  * This module in only based on the code in this paper and is
  62  * almost definitely not the same as the MIT implementation.
  63  */
  64 #include "des_locl.h"
  65
  66 /* bug fix for dos - 7/6/91 - Larry hughes@logos.ucs.indiana.edu */
  67 #define Q_B0(a) (((DES_LONG)(a)))
  68 #define Q_B1(a) (((DES_LONG)(a))<<8)
  69 #define Q_B2(a) (((DES_LONG)(a))<<16)
  70 #define Q_B3(a) (((DES_LONG)(a))<<24)
  71
  72 /* used to scramble things a bit */
  73 /* Got the value MIT uses via brute force :-) 2/10/90 eay */
  74 #define NOISE   ((DES_LONG)83653421L)
  75
  76 DES_LONG des_quad_cksum(input, output, length, out_count, seed)
  77      des_cblock (*input);
  78      des_cblock (*output);
  79      long length;
  80      int out_count;
  81      des_cblock (*seed);
  82 {
  83     DES_LONG z0,z1,t0,t1;
  84     int i;
  85     long l;
  86 #ifdef _CRAY
  87     typedef struct {
  88         unsigned int a:32;
  89         unsigned int b:32;
  90     } XXX;
  91 #else
  92     typedef DES_LONG XXX;
  93 #endif
  94     unsigned char *cp;
  95     XXX *lp;
  96
  97     if (out_count < 1) out_count=1;
  98     lp=(XXX*)output;
  99
 100     z0=Q_B0((*seed)[0])|Q_B1((*seed)[1])|Q_B2((*seed)[2])|Q_B3((*seed)[3]);
 101     z1=Q_B0((*seed)[4])|Q_B1((*seed)[5])|Q_B2((*seed)[6])|Q_B3((*seed)[7]);
 102
 103     for (i=0; ((i<4)&&(i<out_count)); i++)
 104         {
 105             cp=(unsigned char *)input;
 106             l=length;
 107             while (l > 0)
 108                 {
 109                     if (l > 1)
 110                         {
 111                             t0= (DES_LONG)(*(cp++));
 112                             t0|=(DES_LONG)Q_B1(*(cp++));
 113                             l--;
 114                         }
 115                     else
 116                         t0= (DES_LONG)(*(cp++));
 117                     l--;
 118                     /* add */
 119                     t0+=z0;
 120                     t0&=0xffffffffL;
 121                     t1=z1;
 122                     /* square, well sort of square */
 123                     z0=((((t0*t0)&0xffffffffL)+((t1*t1)&0xffffffffL))
 124                         &0xffffffffL)%0x7fffffffL;
 125                     z1=((t0*((t1+NOISE)&0xffffffffL))&0xffffffffL)%0x7fffffffL;
 126                 }
 127             if (lp != NULL)
 128                 {
 129                     /* The MIT library assumes that the checksum is
 130                      * composed of 2*out_count 32 bit ints */
 131 #ifdef _CRAY
 132                     lp->a = z0;
 133                     lp->b = z1;
 134                     lp++;
 135 #else
 136                     *lp++ = (XXX)z0;
 137                     *lp++ = (XXX)z1;
 138 #endif
 139                 }
 140         }
 141     return(z0);
 142 }
 143