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md2_dgst.c
/* crypto/md2/md2_dgst.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/md2.h>
#include <openssl/opensslv.h>
#include <openssl/crypto.h>

const char MD2_version[]="MD2" OPENSSL_VERSION_PTEXT;

/* Implemented from RFC1319 The MD2 Message-Digest Algorithm
 */

#define UCHAR     unsigned char

static void md2_block(MD2_CTX *c, const unsigned char *d);
/* The magic S table - I have converted it to hex since it is
 * basically just a random byte string. */
static const MD2_INT S[256]={
      0x29, 0x2E, 0x43, 0xC9, 0xA2, 0xD8, 0x7C, 0x01,
      0x3D, 0x36, 0x54, 0xA1, 0xEC, 0xF0, 0x06, 0x13,
      0x62, 0xA7, 0x05, 0xF3, 0xC0, 0xC7, 0x73, 0x8C,
      0x98, 0x93, 0x2B, 0xD9, 0xBC, 0x4C, 0x82, 0xCA,
      0x1E, 0x9B, 0x57, 0x3C, 0xFD, 0xD4, 0xE0, 0x16,
      0x67, 0x42, 0x6F, 0x18, 0x8A, 0x17, 0xE5, 0x12,
      0xBE, 0x4E, 0xC4, 0xD6, 0xDA, 0x9E, 0xDE, 0x49,
      0xA0, 0xFB, 0xF5, 0x8E, 0xBB, 0x2F, 0xEE, 0x7A,
      0xA9, 0x68, 0x79, 0x91, 0x15, 0xB2, 0x07, 0x3F,
      0x94, 0xC2, 0x10, 0x89, 0x0B, 0x22, 0x5F, 0x21,
      0x80, 0x7F, 0x5D, 0x9A, 0x5A, 0x90, 0x32, 0x27,
      0x35, 0x3E, 0xCC, 0xE7, 0xBF, 0xF7, 0x97, 0x03,
      0xFF, 0x19, 0x30, 0xB3, 0x48, 0xA5, 0xB5, 0xD1,
      0xD7, 0x5E, 0x92, 0x2A, 0xAC, 0x56, 0xAA, 0xC6,
      0x4F, 0xB8, 0x38, 0xD2, 0x96, 0xA4, 0x7D, 0xB6,
      0x76, 0xFC, 0x6B, 0xE2, 0x9C, 0x74, 0x04, 0xF1,
      0x45, 0x9D, 0x70, 0x59, 0x64, 0x71, 0x87, 0x20,
      0x86, 0x5B, 0xCF, 0x65, 0xE6, 0x2D, 0xA8, 0x02,
      0x1B, 0x60, 0x25, 0xAD, 0xAE, 0xB0, 0xB9, 0xF6,
      0x1C, 0x46, 0x61, 0x69, 0x34, 0x40, 0x7E, 0x0F,
      0x55, 0x47, 0xA3, 0x23, 0xDD, 0x51, 0xAF, 0x3A,
      0xC3, 0x5C, 0xF9, 0xCE, 0xBA, 0xC5, 0xEA, 0x26,
      0x2C, 0x53, 0x0D, 0x6E, 0x85, 0x28, 0x84, 0x09,
      0xD3, 0xDF, 0xCD, 0xF4, 0x41, 0x81, 0x4D, 0x52,
      0x6A, 0xDC, 0x37, 0xC8, 0x6C, 0xC1, 0xAB, 0xFA,
      0x24, 0xE1, 0x7B, 0x08, 0x0C, 0xBD, 0xB1, 0x4A,
      0x78, 0x88, 0x95, 0x8B, 0xE3, 0x63, 0xE8, 0x6D,
      0xE9, 0xCB, 0xD5, 0xFE, 0x3B, 0x00, 0x1D, 0x39,
      0xF2, 0xEF, 0xB7, 0x0E, 0x66, 0x58, 0xD0, 0xE4,
      0xA6, 0x77, 0x72, 0xF8, 0xEB, 0x75, 0x4B, 0x0A,
      0x31, 0x44, 0x50, 0xB4, 0x8F, 0xED, 0x1F, 0x1A,
      0xDB, 0x99, 0x8D, 0x33, 0x9F, 0x11, 0x83, 0x14,
      };

const char *MD2_options(void)
      {
      if (sizeof(MD2_INT) == 1)
            return("md2(char)");
      else
            return("md2(int)");
      }

int MD2_Init(MD2_CTX *c)
      {
      c->num=0;
      memset(c->state,0,sizeof c->state);
      memset(c->cksm,0,sizeof c->cksm);
      memset(c->data,0,sizeof c->data);
      return 1;
      }

int MD2_Update(MD2_CTX *c, const unsigned char *data, size_t len)
      {
      register UCHAR *p;

      if (len == 0) return 1;

      p=c->data;
      if (c->num != 0)
            {
            if ((c->num+len) >= MD2_BLOCK)
                  {
                  memcpy(&(p[c->num]),data,MD2_BLOCK-c->num);
                  md2_block(c,c->data);
                  data+=(MD2_BLOCK - c->num);
                  len-=(MD2_BLOCK - c->num);
                  c->num=0;
                  /* drop through and do the rest */
                  }
            else
                  {
                  memcpy(&(p[c->num]),data,len);
                  /* data+=len; */
                  c->num+=(int)len;
                  return 1;
                  }
            }
      /* we now can process the input data in blocks of MD2_BLOCK
       * chars and save the leftovers to c->data. */
      while (len >= MD2_BLOCK)
            {
            md2_block(c,data);
            data+=MD2_BLOCK;
            len-=MD2_BLOCK;
            }
      memcpy(p,data,len);
      c->num=(int)len;
      return 1;
      }

static void md2_block(MD2_CTX *c, const unsigned char *d)
      {
      register MD2_INT t,*sp1,*sp2;
      register int i,j;
      MD2_INT state[48];

      sp1=c->state;
      sp2=c->cksm;
      j=sp2[MD2_BLOCK-1];
      for (i=0; i<16; i++)
            {
            state[i]=sp1[i];
            state[i+16]=t=d[i];
            state[i+32]=(t^sp1[i]);
            j=sp2[i]^=S[t^j];
            }
      t=0;
      for (i=0; i<18; i++)
            {
            for (j=0; j<48; j+=8)
                  {
                  t= state[j+ 0]^=S[t];
                  t= state[j+ 1]^=S[t];
                  t= state[j+ 2]^=S[t];
                  t= state[j+ 3]^=S[t];
                  t= state[j+ 4]^=S[t];
                  t= state[j+ 5]^=S[t];
                  t= state[j+ 6]^=S[t];
                  t= state[j+ 7]^=S[t];
                  }
            t=(t+i)&0xff;
            }
      memcpy(sp1,state,16*sizeof(MD2_INT));
      OPENSSL_cleanse(state,48*sizeof(MD2_INT));
      }

int MD2_Final(unsigned char *md, MD2_CTX *c)
      {
      int i,v;
      register UCHAR *cp;
      register MD2_INT *p1,*p2;

      cp=c->data;
      p1=c->state;
      p2=c->cksm;
      v=MD2_BLOCK-c->num;
      for (i=c->num; i<MD2_BLOCK; i++)
            cp[i]=(UCHAR)v;

      md2_block(c,cp);

      for (i=0; i<MD2_BLOCK; i++)
            cp[i]=(UCHAR)p2[i];
      md2_block(c,cp);

      for (i=0; i<16; i++)
            md[i]=(UCHAR)(p1[i]&0xff);
      memset((char *)&c,0,sizeof(c));
      return 1;
      }


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