/*      $NetBSD: md5_dgst.c,v 1.1.1.1 2009/04/12 15:33:31 christos Exp $        */

/* crypto/md/md5_dgst.c */
/* Copyright (C) 1995-1997 Eric Young ([email protected])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([email protected]).
* 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 ([email protected]).
*
* 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 ([email protected])"
*    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 ([email protected])"
*
* 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.]
*/

#ifdef USE_MD5 /*%< Added by [email protected] 1998/1/26 */
#include <port_before.h>
#ifndef HAVE_MD5
#include <stdio.h>
#include "md5_locl.h"
#include <port_after.h>

const char *MD5_version="MD5 part of SSLeay 0.8.1 19-Jul-1997";

/*! \file
* \brief
*  Implemented from RFC1321 The MD5 Message-Digest Algorithm
*/

#define INIT_DATA_A (unsigned long)0x67452301L
#define INIT_DATA_B (unsigned long)0xefcdab89L
#define INIT_DATA_C (unsigned long)0x98badcfeL
#define INIT_DATA_D (unsigned long)0x10325476L

#ifndef NOPROTO
static void md5_block(MD5_CTX *c, unsigned long *p);
#else
static void md5_block();
#endif

void MD5_Init(c)
MD5_CTX *c;
       {
       c->A=INIT_DATA_A;
       c->B=INIT_DATA_B;
       c->C=INIT_DATA_C;
       c->D=INIT_DATA_D;
       c->Nl=0;
       c->Nh=0;
       c->num=0;
       }

void MD5_Update(c, data, len)
MD5_CTX *c;
register const unsigned char *data;
unsigned long len;
       {
       register ULONG *p;
       int sw,sc;
       ULONG l;

       if (len == 0U) return;

       l=(c->Nl+(len<<3))&0xffffffffL;
       /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
        * Wei Dai <[email protected]> for pointing it out. */
       if (l < c->Nl) /*%< overflow */
               c->Nh++;
       c->Nh+=(len>>29);
       c->Nl=l;

       if (c->num != 0)
               {
               p=c->data;
               sw=c->num>>2;
               sc=c->num&0x03;

               if ((c->num+len) >= (size_t)MD5_CBLOCK)
                       {
                       l= p[sw];
                       p_c2l(data,l,sc);
                       p[sw++]=l;
                       for (; sw<MD5_LBLOCK; sw++)
                               {
                               c2l(data,l);
                               p[sw]=l;
                               }
                       len-=(MD5_CBLOCK-c->num);

                       md5_block(c,p);
                       c->num=0;
                       /* drop through and do the rest */
                       }
               else
                       {
                       int ew,ec;

                       c->num+=(int)len;
                       if ((sc+len) < 4U) /*%< ugly, add char's to a word */
                               {
                               l= p[sw];
                               p_c2l_p(data,l,sc,len);
                               p[sw]=l;
                               }
                       else
                               {
                               ew=(c->num>>2);
                               ec=(c->num&0x03);
                               l= p[sw];
                               p_c2l(data,l,sc);
                               p[sw++]=l;
                               for (; sw < ew; sw++)
                                       { c2l(data,l); p[sw]=l; }
                               if (ec)
                                       {
                                       c2l_p(data,l,ec);
                                       p[sw]=l;
                                       }
                               }
                       return;
                       }
               }
       /* we now can process the input data in blocks of MD5_CBLOCK
        * chars and save the leftovers to c->data. */
       p=c->data;
       while (len >= (size_t)MD5_CBLOCK)
               {
#if defined(L_ENDIAN) || defined(B_ENDIAN)
               memcpy(p,data,MD5_CBLOCK);
               data+=MD5_CBLOCK;
#ifdef B_ENDIAN
               for (sw=(MD5_LBLOCK/4); sw; sw--)
                       {
                       Endian_Reverse32(p[0]);
                       Endian_Reverse32(p[1]);
                       Endian_Reverse32(p[2]);
                       Endian_Reverse32(p[3]);
                       p+=4;
                       }
#endif
#else
               for (sw=(MD5_LBLOCK/4); sw; sw--)
                       {
                       c2l(data,l); *(p++)=l;
                       c2l(data,l); *(p++)=l;
                       c2l(data,l); *(p++)=l;
                       c2l(data,l); *(p++)=l;
                       }
#endif
               p=c->data;
               md5_block(c,p);
               len-=MD5_CBLOCK;
               }
       sc=(int)len;
       c->num=sc;
       if (sc)
               {
               sw=sc>>2;       /*%< words to copy */
#ifdef L_ENDIAN
               p[sw]=0;
               memcpy(p,data,sc);
#else
               sc&=0x03;
               for ( ; sw; sw--)
                       { c2l(data,l); *(p++)=l; }
               c2l_p(data,l,sc);
               *p=l;
#endif
               }
       }

static void md5_block(c, X)
MD5_CTX *c;
register ULONG *X;
       {
       register ULONG A,B,C,D;

       A=c->A;
       B=c->B;
       C=c->C;
       D=c->D;

       /* Round 0 */
       R0(A,B,C,D,X[ 0], 7,0xd76aa478L);
       R0(D,A,B,C,X[ 1],12,0xe8c7b756L);
       R0(C,D,A,B,X[ 2],17,0x242070dbL);
       R0(B,C,D,A,X[ 3],22,0xc1bdceeeL);
       R0(A,B,C,D,X[ 4], 7,0xf57c0fafL);
       R0(D,A,B,C,X[ 5],12,0x4787c62aL);
       R0(C,D,A,B,X[ 6],17,0xa8304613L);
       R0(B,C,D,A,X[ 7],22,0xfd469501L);
       R0(A,B,C,D,X[ 8], 7,0x698098d8L);
       R0(D,A,B,C,X[ 9],12,0x8b44f7afL);
       R0(C,D,A,B,X[10],17,0xffff5bb1L);
       R0(B,C,D,A,X[11],22,0x895cd7beL);
       R0(A,B,C,D,X[12], 7,0x6b901122L);
       R0(D,A,B,C,X[13],12,0xfd987193L);
       R0(C,D,A,B,X[14],17,0xa679438eL);
       R0(B,C,D,A,X[15],22,0x49b40821L);
       /* Round 1 */
       R1(A,B,C,D,X[ 1], 5,0xf61e2562L);
       R1(D,A,B,C,X[ 6], 9,0xc040b340L);
       R1(C,D,A,B,X[11],14,0x265e5a51L);
       R1(B,C,D,A,X[ 0],20,0xe9b6c7aaL);
       R1(A,B,C,D,X[ 5], 5,0xd62f105dL);
       R1(D,A,B,C,X[10], 9,0x02441453L);
       R1(C,D,A,B,X[15],14,0xd8a1e681L);
       R1(B,C,D,A,X[ 4],20,0xe7d3fbc8L);
       R1(A,B,C,D,X[ 9], 5,0x21e1cde6L);
       R1(D,A,B,C,X[14], 9,0xc33707d6L);
       R1(C,D,A,B,X[ 3],14,0xf4d50d87L);
       R1(B,C,D,A,X[ 8],20,0x455a14edL);
       R1(A,B,C,D,X[13], 5,0xa9e3e905L);
       R1(D,A,B,C,X[ 2], 9,0xfcefa3f8L);
       R1(C,D,A,B,X[ 7],14,0x676f02d9L);
       R1(B,C,D,A,X[12],20,0x8d2a4c8aL);
       /* Round 2 */
       R2(A,B,C,D,X[ 5], 4,0xfffa3942L);
       R2(D,A,B,C,X[ 8],11,0x8771f681L);
       R2(C,D,A,B,X[11],16,0x6d9d6122L);
       R2(B,C,D,A,X[14],23,0xfde5380cL);
       R2(A,B,C,D,X[ 1], 4,0xa4beea44L);
       R2(D,A,B,C,X[ 4],11,0x4bdecfa9L);
       R2(C,D,A,B,X[ 7],16,0xf6bb4b60L);
       R2(B,C,D,A,X[10],23,0xbebfbc70L);
       R2(A,B,C,D,X[13], 4,0x289b7ec6L);
       R2(D,A,B,C,X[ 0],11,0xeaa127faL);
       R2(C,D,A,B,X[ 3],16,0xd4ef3085L);
       R2(B,C,D,A,X[ 6],23,0x04881d05L);
       R2(A,B,C,D,X[ 9], 4,0xd9d4d039L);
       R2(D,A,B,C,X[12],11,0xe6db99e5L);
       R2(C,D,A,B,X[15],16,0x1fa27cf8L);
       R2(B,C,D,A,X[ 2],23,0xc4ac5665L);
       /* Round 3 */
       R3(A,B,C,D,X[ 0], 6,0xf4292244L);
       R3(D,A,B,C,X[ 7],10,0x432aff97L);
       R3(C,D,A,B,X[14],15,0xab9423a7L);
       R3(B,C,D,A,X[ 5],21,0xfc93a039L);
       R3(A,B,C,D,X[12], 6,0x655b59c3L);
       R3(D,A,B,C,X[ 3],10,0x8f0ccc92L);
       R3(C,D,A,B,X[10],15,0xffeff47dL);
       R3(B,C,D,A,X[ 1],21,0x85845dd1L);
       R3(A,B,C,D,X[ 8], 6,0x6fa87e4fL);
       R3(D,A,B,C,X[15],10,0xfe2ce6e0L);
       R3(C,D,A,B,X[ 6],15,0xa3014314L);
       R3(B,C,D,A,X[13],21,0x4e0811a1L);
       R3(A,B,C,D,X[ 4], 6,0xf7537e82L);
       R3(D,A,B,C,X[11],10,0xbd3af235L);
       R3(C,D,A,B,X[ 2],15,0x2ad7d2bbL);
       R3(B,C,D,A,X[ 9],21,0xeb86d391L);

       c->A+=A&0xffffffffL;
       c->B+=B&0xffffffffL;
       c->C+=C&0xffffffffL;
       c->D+=D&0xffffffffL;
       }

void MD5_Final(md, c)
unsigned char *md;
MD5_CTX *c;
       {
       register int i,j;
       register ULONG l;
       register ULONG *p;
       static unsigned char end[4]={0x80,0x00,0x00,0x00};
       unsigned char *cp=end;

       /* c->num should definitly have room for at least one more byte. */
       p=c->data;
       j=c->num;
       i=j>>2;

       /* purify often complains about the following line as an
        * Uninitialized Memory Read.  While this can be true, the
        * following p_c2l macro will reset l when that case is true.
        * This is because j&0x03 contains the number of 'valid' bytes
        * already in p[i].  If and only if j&0x03 == 0, the UMR will
        * occur but this is also the only time p_c2l will do
        * l= *(cp++) instead of l|= *(cp++)
        * Many thanks to Alex Tang <[email protected]> for pickup this
        * 'potential bug' */
#ifdef PURIFY
       if ((j&0x03) == 0) p[i]=0;
#endif
       l=p[i];
       p_c2l(cp,l,j&0x03);
       p[i]=l;
       i++;
       /* i is the next 'undefined word' */
       if (c->num >= MD5_LAST_BLOCK)
               {
               for (; i<MD5_LBLOCK; i++)
                       p[i]=0;
               md5_block(c,p);
               i=0;
               }
       for (; i<(MD5_LBLOCK-2); i++)
               p[i]=0;
       p[MD5_LBLOCK-2]=c->Nl;
       p[MD5_LBLOCK-1]=c->Nh;
       md5_block(c,p);
       cp=md;
       l=c->A; l2c(l,cp);
       l=c->B; l2c(l,cp);
       l=c->C; l2c(l,cp);
       l=c->D; l2c(l,cp);

       /* clear stuff, md5_block may be leaving some stuff on the stack
        * but I'm not worried :-) */
       c->num=0;
/*      memset((char *)&c,0,sizeof(c));*/
       }

#ifdef undef
int printit(l)
unsigned long *l;
       {
       int i,ii;

       for (i=0; i<2; i++)
               {
               for (ii=0; ii<8; ii++)
                       {
                       fprintf(stderr,"%08lx ",l[i*8+ii]);
                       }
               fprintf(stderr,"\n");
               }
       }
#endif
#endif /* HAVE_MD5 */
#endif /* USE_MD5 */

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