text: /* crypto/mdc2/mdc2dgst.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/des.h>
  #include <openssl/mdc2.h>
  #include <openssl/crypto.h>
  
  #undef c2l
  #define c2l(c,l)	(l =((DES_LONG)(*((c)++)))    , \
  			 l|=((DES_LONG)(*((c)++)))<< 8L, \
  			 l|=((DES_LONG)(*((c)++)))<<16L, \
  			 l|=((DES_LONG)(*((c)++)))<<24L)
  
  #undef l2c
  #define l2c(l,c)	(*((c)++)=(unsigned char)(((l)     )&0xff), \
  			*((c)++)=(unsigned char)(((l)>> 8L)&0xff), \
  			*((c)++)=(unsigned char)(((l)>>16L)&0xff), \
  			*((c)++)=(unsigned char)(((l)>>24L)&0xff))
  
  static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len);
  fips_md_init(MDC2)
  	{
  	c->num=0;
  	c->pad_type=1;
  	memset(&(c->h[0]),0x52,MDC2_BLOCK);
  	memset(&(c->hh[0]),0x25,MDC2_BLOCK);
  	return 1;
  	}
  
  int MDC2_Update(MDC2_CTX *c, const unsigned char *in, size_t len)
  	{
  	size_t i,j;
  
  	i=c->num;
  	if (i != 0)
  		{
  		if (i+len < MDC2_BLOCK)
  			{
  			/* partial block */
  			memcpy(&(c->data[i]),in,len);
  			c->num+=(int)len;
  			return 1;
  			}
  		else
  			{
  			/* filled one */
  			j=MDC2_BLOCK-i;
  			memcpy(&(c->data[i]),in,j);
  			len-=j;
  			in+=j;
  			c->num=0;
  			mdc2_body(c,&(c->data[0]),MDC2_BLOCK);
  			}
  		}
  	i=len&~((size_t)MDC2_BLOCK-1);
  	if (i > 0) mdc2_body(c,in,i);
  	j=len-i;
  	if (j > 0)
  		{
  		memcpy(&(c->data[0]),&(in[i]),j);
  		c->num=(int)j;
  		}
  	return 1;
  	}
  
  static void mdc2_body(MDC2_CTX *c, const unsigned char *in, size_t len)
  	{
  	register DES_LONG tin0,tin1;
  	register DES_LONG ttin0,ttin1;
  	DES_LONG d[2],dd[2];
  	DES_key_schedule k;
  	unsigned char *p;
  	size_t i;
  
  	for (i=0; i<len; i+=8)
  		{
  		c2l(in,tin0); d[0]=dd[0]=tin0;
  		c2l(in,tin1); d[1]=dd[1]=tin1;
  		c->h[0]=(c->h[0]&0x9f)|0x40;
  		c->hh[0]=(c->hh[0]&0x9f)|0x20;
  
  		DES_set_odd_parity(&c->h);
  		DES_set_key_unchecked(&c->h,&k);
  		DES_encrypt1(d,&k,1);
  
  		DES_set_odd_parity(&c->hh);
  		DES_set_key_unchecked(&c->hh,&k);
  		DES_encrypt1(dd,&k,1);
  
  		ttin0=tin0^dd[0];
  		ttin1=tin1^dd[1];
  		tin0^=d[0];
  		tin1^=d[1];
  
  		p=c->h;
  		l2c(tin0,p);
  		l2c(ttin1,p);
  		p=c->hh;
  		l2c(ttin0,p);
  		l2c(tin1,p);
  		}
  	}
  
  int MDC2_Final(unsigned char *md, MDC2_CTX *c)
  	{
  	unsigned int i;
  	int j;
  
  	i=c->num;
  	j=c->pad_type;
  	if ((i > 0) || (j == 2))
  		{
  		if (j == 2)
  			c->data[i++]=0x80;
  		memset(&(c->data[i]),0,MDC2_BLOCK-i);
  		mdc2_body(c,c->data,MDC2_BLOCK);
  		}
  	memcpy(md,(char *)c->h,MDC2_BLOCK);
  	memcpy(&(md[MDC2_BLOCK]),(char *)c->hh,MDC2_BLOCK);
  	return 1;
  	}
  
  #undef TEST
  
  #ifdef TEST
  main()
  	{
  	unsigned char md[MDC2_DIGEST_LENGTH];
  	int i;
  	MDC2_CTX c;
  	static char *text="Now is the time for all ";
  
  	MDC2_Init(&c);
  	MDC2_Update(&c,text,strlen(text));
  	MDC2_Final(&(md[0]),&c);
  
  	for (i=0; i<MDC2_DIGEST_LENGTH; i++)
  		printf("%02X",md[i]);
  	printf("\n");
  	}
  
  #endif
  