/********************************************************************\
 *
 *      FILE:     rmd128.c
 *
 *      CONTENTS: A sample C-implementation of the RIPEMD-128
 *                hash-function. This function is a plug-in substitute 
 *                for RIPEMD. A 160-bit hash result is obtained using
 *                RIPEMD-160.
 *      TARGET:   any computer with an ANSI C compiler
 *
 *      AUTHOR:   Antoon Bosselaers, ESAT-COSIC
 *      DATE:     1 March 1996
 *      VERSION:  1.0
 *
 *      Copyright (c) Katholieke Universiteit Leuven
 *      1996, All Rights Reserved
 *
\********************************************************************/

/*  header files */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rmd128.h"      

/********************************************************************/

void
ripemd128_MDinit (MDbuf)
     dword *MDbuf;
{
   MDbuf[0] = 0x67452301UL;
   MDbuf[1] = 0xefcdab89UL;
   MDbuf[2] = 0x98badcfeUL;
   MDbuf[3] = 0x10325476UL;

   return;
}

/********************************************************************/

void
ripemd128_compress (MDbuf, X)
     dword* MDbuf;
     dword* X;
{
   dword aa = MDbuf[0],  bb = MDbuf[1],  cc = MDbuf[2],  dd = MDbuf[3];
   dword aaa = MDbuf[0], bbb = MDbuf[1], ccc = MDbuf[2], ddd = MDbuf[3];

   /* round 1 */
   FF(aa, bb, cc, dd, X[ 0], 11);
   FF(dd, aa, bb, cc, X[ 1], 14);
   FF(cc, dd, aa, bb, X[ 2], 15);
   FF(bb, cc, dd, aa, X[ 3], 12);
   FF(aa, bb, cc, dd, X[ 4],  5);
   FF(dd, aa, bb, cc, X[ 5],  8);
   FF(cc, dd, aa, bb, X[ 6],  7);
   FF(bb, cc, dd, aa, X[ 7],  9);
   FF(aa, bb, cc, dd, X[ 8], 11);
   FF(dd, aa, bb, cc, X[ 9], 13);
   FF(cc, dd, aa, bb, X[10], 14);
   FF(bb, cc, dd, aa, X[11], 15);
   FF(aa, bb, cc, dd, X[12],  6);
   FF(dd, aa, bb, cc, X[13],  7);
   FF(cc, dd, aa, bb, X[14],  9);
   FF(bb, cc, dd, aa, X[15],  8);
                             
   /* round 2 */
   GG(aa, bb, cc, dd, X[ 7],  7);
   GG(dd, aa, bb, cc, X[ 4],  6);
   GG(cc, dd, aa, bb, X[13],  8);
   GG(bb, cc, dd, aa, X[ 1], 13);
   GG(aa, bb, cc, dd, X[10], 11);
   GG(dd, aa, bb, cc, X[ 6],  9);
   GG(cc, dd, aa, bb, X[15],  7);
   GG(bb, cc, dd, aa, X[ 3], 15);
   GG(aa, bb, cc, dd, X[12],  7);
   GG(dd, aa, bb, cc, X[ 0], 12);
   GG(cc, dd, aa, bb, X[ 9], 15);
   GG(bb, cc, dd, aa, X[ 5],  9);
   GG(aa, bb, cc, dd, X[ 2], 11);
   GG(dd, aa, bb, cc, X[14],  7);
   GG(cc, dd, aa, bb, X[11], 13);
   GG(bb, cc, dd, aa, X[ 8], 12);

   /* round 3 */
   HH(aa, bb, cc, dd, X[ 3], 11);
   HH(dd, aa, bb, cc, X[10], 13);
   HH(cc, dd, aa, bb, X[14],  6);
   HH(bb, cc, dd, aa, X[ 4],  7);
   HH(aa, bb, cc, dd, X[ 9], 14);
   HH(dd, aa, bb, cc, X[15],  9);
   HH(cc, dd, aa, bb, X[ 8], 13);
   HH(bb, cc, dd, aa, X[ 1], 15);
   HH(aa, bb, cc, dd, X[ 2], 14);
   HH(dd, aa, bb, cc, X[ 7],  8);
   HH(cc, dd, aa, bb, X[ 0], 13);
   HH(bb, cc, dd, aa, X[ 6],  6);
   HH(aa, bb, cc, dd, X[13],  5);
   HH(dd, aa, bb, cc, X[11], 12);
   HH(cc, dd, aa, bb, X[ 5],  7);
   HH(bb, cc, dd, aa, X[12],  5);

   /* round 4 */
   II(aa, bb, cc, dd, X[ 1], 11);
   II(dd, aa, bb, cc, X[ 9], 12);
   II(cc, dd, aa, bb, X[11], 14);
   II(bb, cc, dd, aa, X[10], 15);
   II(aa, bb, cc, dd, X[ 0], 14);
   II(dd, aa, bb, cc, X[ 8], 15);
   II(cc, dd, aa, bb, X[12],  9);
   II(bb, cc, dd, aa, X[ 4],  8);
   II(aa, bb, cc, dd, X[13],  9);
   II(dd, aa, bb, cc, X[ 3], 14);
   II(cc, dd, aa, bb, X[ 7],  5);
   II(bb, cc, dd, aa, X[15],  6);
   II(aa, bb, cc, dd, X[14],  8);
   II(dd, aa, bb, cc, X[ 5],  6);
   II(cc, dd, aa, bb, X[ 6],  5);
   II(bb, cc, dd, aa, X[ 2], 12);

   /* parallel round 1 */
   III(aaa, bbb, ccc, ddd, X[ 5],  8); 
   III(ddd, aaa, bbb, ccc, X[14],  9);
   III(ccc, ddd, aaa, bbb, X[ 7],  9);
   III(bbb, ccc, ddd, aaa, X[ 0], 11);
   III(aaa, bbb, ccc, ddd, X[ 9], 13);
   III(ddd, aaa, bbb, ccc, X[ 2], 15);
   III(ccc, ddd, aaa, bbb, X[11], 15);
   III(bbb, ccc, ddd, aaa, X[ 4],  5);
   III(aaa, bbb, ccc, ddd, X[13],  7);
   III(ddd, aaa, bbb, ccc, X[ 6],  7);
   III(ccc, ddd, aaa, bbb, X[15],  8);
   III(bbb, ccc, ddd, aaa, X[ 8], 11);
   III(aaa, bbb, ccc, ddd, X[ 1], 14);
   III(ddd, aaa, bbb, ccc, X[10], 14);
   III(ccc, ddd, aaa, bbb, X[ 3], 12);
   III(bbb, ccc, ddd, aaa, X[12],  6);

   /* parallel round 2 */
   HHH(aaa, bbb, ccc, ddd, X[ 6],  9);
   HHH(ddd, aaa, bbb, ccc, X[11], 13);
   HHH(ccc, ddd, aaa, bbb, X[ 3], 15);
   HHH(bbb, ccc, ddd, aaa, X[ 7],  7);
   HHH(aaa, bbb, ccc, ddd, X[ 0], 12);
   HHH(ddd, aaa, bbb, ccc, X[13],  8);
   HHH(ccc, ddd, aaa, bbb, X[ 5],  9);
   HHH(bbb, ccc, ddd, aaa, X[10], 11);
   HHH(aaa, bbb, ccc, ddd, X[14],  7);
   HHH(ddd, aaa, bbb, ccc, X[15],  7);
   HHH(ccc, ddd, aaa, bbb, X[ 8], 12);
   HHH(bbb, ccc, ddd, aaa, X[12],  7);
   HHH(aaa, bbb, ccc, ddd, X[ 4],  6);
   HHH(ddd, aaa, bbb, ccc, X[ 9], 15);
   HHH(ccc, ddd, aaa, bbb, X[ 1], 13);
   HHH(bbb, ccc, ddd, aaa, X[ 2], 11);

   /* parallel round 3 */   
   GGG(aaa, bbb, ccc, ddd, X[15],  9);
   GGG(ddd, aaa, bbb, ccc, X[ 5],  7);
   GGG(ccc, ddd, aaa, bbb, X[ 1], 15);
   GGG(bbb, ccc, ddd, aaa, X[ 3], 11);
   GGG(aaa, bbb, ccc, ddd, X[ 7],  8);
   GGG(ddd, aaa, bbb, ccc, X[14],  6);
   GGG(ccc, ddd, aaa, bbb, X[ 6],  6);
   GGG(bbb, ccc, ddd, aaa, X[ 9], 14);
   GGG(aaa, bbb, ccc, ddd, X[11], 12);
   GGG(ddd, aaa, bbb, ccc, X[ 8], 13);
   GGG(ccc, ddd, aaa, bbb, X[12],  5);
   GGG(bbb, ccc, ddd, aaa, X[ 2], 14);
   GGG(aaa, bbb, ccc, ddd, X[10], 13);
   GGG(ddd, aaa, bbb, ccc, X[ 0], 13);
   GGG(ccc, ddd, aaa, bbb, X[ 4],  7);
   GGG(bbb, ccc, ddd, aaa, X[13],  5);

   /* parallel round 4 */
   FFF(aaa, bbb, ccc, ddd, X[ 8], 15);
   FFF(ddd, aaa, bbb, ccc, X[ 6],  5);
   FFF(ccc, ddd, aaa, bbb, X[ 4],  8);
   FFF(bbb, ccc, ddd, aaa, X[ 1], 11);
   FFF(aaa, bbb, ccc, ddd, X[ 3], 14);
   FFF(ddd, aaa, bbb, ccc, X[11], 14);
   FFF(ccc, ddd, aaa, bbb, X[15],  6);
   FFF(bbb, ccc, ddd, aaa, X[ 0], 14);
   FFF(aaa, bbb, ccc, ddd, X[ 5],  6);
   FFF(ddd, aaa, bbb, ccc, X[12],  9);
   FFF(ccc, ddd, aaa, bbb, X[ 2], 12);
   FFF(bbb, ccc, ddd, aaa, X[13],  9);
   FFF(aaa, bbb, ccc, ddd, X[ 9], 12);
   FFF(ddd, aaa, bbb, ccc, X[ 7],  5);
   FFF(ccc, ddd, aaa, bbb, X[10], 15);
   FFF(bbb, ccc, ddd, aaa, X[14],  8);

   /* combine results */
   ddd += cc + MDbuf[1];               /* final result for MDbuf[0] */
   MDbuf[1] = MDbuf[2] + dd + aaa;
   MDbuf[2] = MDbuf[3] + aa + bbb;
   MDbuf[3] = MDbuf[0] + bb + ccc;
   MDbuf[0] = ddd;

   return;
}

/********************************************************************/

void
ripemd128_MDfinish (MDbuf, strptr, lswlen, mswlen)
     dword* MDbuf;
     byte*  strptr;
     dword  lswlen;
     dword  mswlen;
{
   dword        i;                                 /* counter       */
   dword        X[16];                             /* message words */

   memset(X, 0, 16*sizeof(dword));

   /* put bytes from strptr into X */
   for (i=0; i<(lswlen&63); i++) {
      /* byte i goes into word X[i div 4] at pos.  8*(i mod 4)  */
      X[i>>2] ^= (dword) *strptr++ << (8 * (i&3));
   }

   /* append the bit m_n == 1 */
   X[(lswlen>>2)&15] ^= (dword)1 << (8*(lswlen&3) + 7);

   if ((lswlen & 63) > 55) {
      /* length goes to next block */
      ripemd128_compress(MDbuf, X);
      memset(X, 0, 16*sizeof(dword));
   }

   /* append length in bits*/
   X[14] = lswlen << 3;
   X[15] = (lswlen >> 29) | (mswlen << 3);
   ripemd128_compress(MDbuf, X);

   return;
}

/************************ end of file rmd128.c **********************/

