crypto/mdc2/mdc2dgst.c

   1 /* crypto/mdc2/mdc2dgst.c */
   2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   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@cryptsoft.com).
  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@cryptsoft.com)"
  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@cryptsoft.com)"
  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 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include "des.h"
  63 #include "mdc2.h"
  64
  65 #undef c2l
  66 #define c2l(c,l)        (l =((DES_LONG)(*((c)++)))    , \
  67                          l|=((DES_LONG)(*((c)++)))<< 8L, \
  68                          l|=((DES_LONG)(*((c)++)))<<16L, \
  69                          l|=((DES_LONG)(*((c)++)))<<24L)
  70
  71 #undef l2c
  72 #define l2c(l,c)        (*((c)++)=(unsigned char)(((l)     )&0xff), \
  73                         *((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  74                         *((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  75                         *((c)++)=(unsigned char)(((l)>>24L)&0xff))
  76
  77 #ifndef NOPROTO
  78 static void mdc2_body(MDC2_CTX *c, unsigned char *in, unsigned int len);
  79 #else
  80 static void mdc2_body();
  81 #endif
  82
  83 void MDC2_Init(c)
  84 MDC2_CTX *c;
  85         {
  86         c->num=0;
  87         c->pad_type=1;
  88         memset(&(c->h[0]),0x52,MDC2_BLOCK);
  89         memset(&(c->hh[0]),0x25,MDC2_BLOCK);
  90         }
  91
  92 void MDC2_Update(c,in,len)
  93 MDC2_CTX *c;
  94 register unsigned char *in;
  95 unsigned long len;
  96         {
  97         int i,j;
  98
  99         i=c->num;
 100         if (i != 0)
 101                 {
 102                 if (i+len < MDC2_BLOCK)
 103                         {
 104                         /* partial block */
 105                         memcpy(&(c->data[i]),in,(int)len);
 106                         c->num+=(int)len;
 107                         return;
 108                         }
 109                 else
 110                         {
 111                         /* filled one */
 112                         j=MDC2_BLOCK-i;
 113                         memcpy(&(c->data[i]),in,j);
 114                         len-=j;
 115                         in+=j;
 116                         c->num=0;
 117                         mdc2_body(c,&(c->data[0]),MDC2_BLOCK);
 118                         }
 119                 }
 120         i=(int)(len&(unsigned long)~(MDC2_BLOCK-1));
 121         if (i > 0) mdc2_body(c,in,i);
 122         j=(int)len-i;
 123         if (j > 0)
 124                 {
 125                 memcpy(&(c->data[0]),&(in[i]),j);
 126                 c->num=j;
 127                 }
 128         }
 129
 130 static void mdc2_body(c,in,len)
 131 MDC2_CTX *c;
 132 unsigned char *in;
 133 unsigned int len;
 134         {
 135         register DES_LONG tin0,tin1;
 136         register DES_LONG ttin0,ttin1;
 137         DES_LONG d[2],dd[2];
 138         des_cblock *h,*hh;
 139         des_key_schedule k;
 140         unsigned char *p;
 141         unsigned int i;
 142
 143         h= (des_cblock *)&(c->h[0]);
 144         hh= (des_cblock *)&(c->hh[0]);
 145
 146         for (i=0; i<len; i+=8)
 147                 {
 148                 c2l(in,tin0); d[0]=dd[0]=tin0;
 149                 c2l(in,tin1); d[1]=dd[1]=tin1;
 150                 (*h)[0]=((*h)[0]&0x9f)|0x40;
 151                 (*hh)[0]=((*hh)[0]&0x9f)|0x20;
 152
 153                 des_set_key(h,k);
 154                 des_encrypt((DES_LONG *)d,k,1);
 155
 156                 des_set_key(hh,k);
 157                 des_encrypt((DES_LONG *)dd,k,1);
 158
 159                 ttin0=tin0^dd[0];
 160                 ttin1=tin1^dd[1];
 161                 tin0^=d[0];
 162                 tin1^=d[1];
 163
 164                 p=(unsigned char *)h;
 165                 l2c(tin0,p);
 166                 l2c(ttin1,p);
 167                 p=(unsigned char *)hh;
 168                 l2c(ttin0,p);
 169                 l2c(tin1,p);
 170                 }
 171         }
 172
 173 void MDC2_Final(md,c)
 174 unsigned char *md;
 175 MDC2_CTX *c;
 176         {
 177         int i,j;
 178
 179         i=c->num;
 180         j=c->pad_type;
 181         if ((i > 0) || (j == 2))
 182                 {
 183                 if (j == 2)
 184                         c->data[i++]=0x80;
 185                 memset(&(c->data[i]),0,MDC2_BLOCK-i);
 186                 mdc2_body(c,c->data,MDC2_BLOCK);
 187                 }
 188         memcpy(md,(char *)c->h,MDC2_BLOCK);
 189         memcpy(&(md[MDC2_BLOCK]),(char *)c->hh,MDC2_BLOCK);
 190         }
 191
 192 #undef TEST
 193
 194 #ifdef TEST
 195 main()
 196         {
 197         unsigned char md[MDC2_DIGEST_LENGTH];
 198         int i;
 199         MDC2_CTX c;
 200         static char *text="Now is the time for all ";
 201
 202         MDC2_Init(&c);
 203         MDC2_Update(&c,text,strlen(text));
 204         MDC2_Final(&(md[0]),&c);
 205
 206         for (i=0; i<MDC2_DIGEST_LENGTH; i++)
 207                 printf("%02X",md[i]);
 208         printf("\n");
 209         }
 210
 211 #endif