crypto/mdc2/mdc2dgst.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <openssl/crypto.h>
  62 #include <openssl/des.h>
  63 #include <openssl/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 static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
  78 int MDC2_Init(MDC2_CTX *c)
  79 {
  80     c->num = 0;
  81     c->pad_type = 1;
  82     memset(&(c->h[0]), 0x52, MDC2_BLOCK);
  83     memset(&(c->hh[0]), 0x25, MDC2_BLOCK);
  84     return 1;
  85 }
  86
  87 int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
  88 {
  89     size_t i, j;
  90
  91     i = c->num;
  92     if (i != 0) {
  93         if (i + len < MDC2_BLOCK) {
  94             /* partial block */
  95             memcpy(&(c->data[i]), in, len);
  96             c->num += (int)len;
  97             return 1;
  98         } else {
  99             /* filled one */
 100             j = MDC2_BLOCK - i;
 101             memcpy(&(c->data[i]), in, j);
 102             len -= j;
 103             in += j;
 104             c->num = 0;
 105             mdc2_body(c, &(c->data[0]), MDC2_BLOCK);
 106         }
 107     }
 108     i = len & ~((size_t)MDC2_BLOCK - 1);
 109     if (i > 0)
 110         mdc2_body(c, in, i);
 111     j = len - i;
 112     if (j > 0) {
 113         memcpy(&(c->data[0]), &(in[i]), j);
 114         c->num = (int)j;
 115     }
 116     return 1;
 117 }
 118
 119 static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
 120 {
 121     register DES_LONG tin0, tin1;
 122     register DES_LONG ttin0, ttin1;
 123     DES_LONG d[2], dd[2];
 124     DES_key_schedule k;
 125     unsigned char *p;
 126     size_t i;
 127
 128     for (i = 0; i < len; i += 8) {
 129         c2l(in, tin0);
 130         d[0] = dd[0] = tin0;
 131         c2l(in, tin1);
 132         d[1] = dd[1] = tin1;
 133         c->h[0] = (c->h[0] & 0x9f) | 0x40;
 134         c->hh[0] = (c->hh[0] & 0x9f) | 0x20;
 135
 136         DES_set_odd_parity(&c->h);
 137         DES_set_key_unchecked(&c->h, &k);
 138         DES_encrypt1(d, &k, 1);
 139
 140         DES_set_odd_parity(&c->hh);
 141         DES_set_key_unchecked(&c->hh, &k);
 142         DES_encrypt1(dd, &k, 1);
 143
 144         ttin0 = tin0 ^ dd[0];
 145         ttin1 = tin1 ^ dd[1];
 146         tin0 ^= d[0];
 147         tin1 ^= d[1];
 148
 149         p = c->h;
 150         l2c(tin0, p);
 151         l2c(ttin1, p);
 152         p = c->hh;
 153         l2c(ttin0, p);
 154         l2c(tin1, p);
 155     }
 156 }
 157
 158 int MDC2_Final(unsigned char *md, MDC2_CTX *c)
 159 {
 160     unsigned int i;
 161     int j;
 162
 163     i = c->num;
 164     j = c->pad_type;
 165     if ((i > 0) || (j == 2)) {
 166         if (j == 2)
 167             c->data[i++] = 0x80;
 168         memset(&(c->data[i]), 0, MDC2_BLOCK - i);
 169         mdc2_body(c, c->data, MDC2_BLOCK);
 170     }
 171     memcpy(md, (char *)c->h, MDC2_BLOCK);
 172     memcpy(&(md[MDC2_BLOCK]), (char *)c->hh, MDC2_BLOCK);
 173     return 1;
 174 }
 175
 176 #undef TEST
 177
 178 #ifdef TEST
 179 main()
 180 {
 181     unsigned char md[MDC2_DIGEST_LENGTH];
 182     int i;
 183     MDC2_CTX c;
 184     static char *text = "Now is the time for all ";
 185
 186     MDC2_Init(&c);
 187     MDC2_Update(&c, text, strlen(text));
 188     MDC2_Final(&(md[0]), &c);
 189
 190     for (i = 0; i < MDC2_DIGEST_LENGTH; i++)
 191         printf("%02X", md[i]);
 192     printf("\n");
 193 }
 194
 195 #endif