/* LibTomCrypt, modular cryptographic library -- Tom St Denis
 *
 * LibTomCrypt is a library that provides various cryptographic
 * algorithms in a highly modular and flexible manner.
 *
 * The library is free for all purposes without any express
 * guarantee it works.
 *
 * Tom St Denis, [email protected], http://libtomcrypt.org
 */

/* Implementation of RIPEMD-160 based on the source by Antoon Bosselaers, ESAT-COSIC
 *
 * This source has been radically overhauled to be portable and work within
 * the LibTomCrypt API by Tom St Denis
 */
#include "mycrypt.h"

#ifdef RIPEMD160

const struct _hash_descriptor rmd160_desc =
{
    "rmd160",
    9,
    20,
    64,

    /* DER identifier */
    { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x24, 
      0x03, 0x02, 0x01, 0x05, 0x00, 0x04, 0x14 },
    15,

    &rmd160_init,
    &rmd160_process,
    &rmd160_done,
    &rmd160_test
};

/* the five basic functions F(), G() and H() */
#define F(x, y, z)        ((x) ^ (y) ^ (z)) 
#define G(x, y, z)        (((x) & (y)) | (~(x) & (z))) 
#define H(x, y, z)        (((x) | ~(y)) ^ (z))
#define I(x, y, z)        (((x) & (z)) | ((y) & ~(z))) 
#define J(x, y, z)        ((x) ^ ((y) | ~(z)))
  
/* the ten basic operations FF() through III() */
#define FF(a, b, c, d, e, x, s)        \
      (a) += F((b), (c), (d)) + (x);\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define GG(a, b, c, d, e, x, s)        \
      (a) += G((b), (c), (d)) + (x) + 0x5a827999UL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define HH(a, b, c, d, e, x, s)        \
      (a) += H((b), (c), (d)) + (x) + 0x6ed9eba1UL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define II(a, b, c, d, e, x, s)        \
      (a) += I((b), (c), (d)) + (x) + 0x8f1bbcdcUL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define JJ(a, b, c, d, e, x, s)        \
      (a) += J((b), (c), (d)) + (x) + 0xa953fd4eUL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define FFF(a, b, c, d, e, x, s)        \
      (a) += F((b), (c), (d)) + (x);\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define GGG(a, b, c, d, e, x, s)        \
      (a) += G((b), (c), (d)) + (x) + 0x7a6d76e9UL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define HHH(a, b, c, d, e, x, s)        \
      (a) += H((b), (c), (d)) + (x) + 0x6d703ef3UL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define III(a, b, c, d, e, x, s)        \
      (a) += I((b), (c), (d)) + (x) + 0x5c4dd124UL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);

#define JJJ(a, b, c, d, e, x, s)        \
      (a) += J((b), (c), (d)) + (x) + 0x50a28be6UL;\
      (a) = ROL((a), (s)) + (e);\
      (c) = ROL((c), 10);


#ifdef CLEAN_STACK
static void _rmd160_compress(hash_state *md, unsigned char *buf)
#else
static void rmd160_compress(hash_state *md, unsigned char *buf)
#endif
{
   ulong32 aa,bb,cc,dd,ee,aaa,bbb,ccc,ddd,eee,X[16];
   int i;

   /* load words X */
   for (i = 0; i < 16; i++){
      LOAD32L(X[i], buf + (4 * i));
   }

   /* load state */
   aa = aaa = md->rmd160.state[0];
   bb = bbb = md->rmd160.state[1];
   cc = ccc = md->rmd160.state[2];
   dd = ddd = md->rmd160.state[3];
   ee = eee = md->rmd160.state[4];

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

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

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

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

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

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

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

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

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

   /* combine results */
   ddd += cc + md->rmd160.state[1];               /* final result for md->rmd160.state[0] */
   md->rmd160.state[1] = md->rmd160.state[2] + dd + eee;
   md->rmd160.state[2] = md->rmd160.state[3] + ee + aaa;
   md->rmd160.state[3] = md->rmd160.state[4] + aa + bbb;
   md->rmd160.state[4] = md->rmd160.state[0] + bb + ccc;
   md->rmd160.state[0] = ddd;
}

#ifdef CLEAN_STACK
static void rmd160_compress(hash_state *md, unsigned char *buf)
{
   _rmd160_compress(md, buf);
   burn_stack(sizeof(ulong32) * 26 + sizeof(int));
}
#endif

void rmd160_init(hash_state * md)
{
   _ARGCHK(md != NULL);
   md->rmd160.state[0] = 0x67452301UL;
   md->rmd160.state[1] = 0xefcdab89UL;
   md->rmd160.state[2] = 0x98badcfeUL;
   md->rmd160.state[3] = 0x10325476UL;
   md->rmd160.state[4] = 0xc3d2e1f0UL;
   md->rmd160.curlen   = 0;
   md->rmd160.length   = 0;
}

HASH_PROCESS(rmd160_process, rmd160_compress, rmd160, 64)

int rmd160_done(hash_state * md, unsigned char *hash)
{
    int i;

    _ARGCHK(md != NULL);
    _ARGCHK(hash != NULL);

    if (md->rmd160.curlen >= sizeof(md->rmd160.buf)) {
       return CRYPT_INVALID_ARG;
    }


    /* increase the length of the message */
    md->rmd160.length += md->rmd160.curlen * 8;

    /* append the '1' bit */
    md->rmd160.buf[md->rmd160.curlen++] = (unsigned char)0x80;

    /* if the length is currently above 56 bytes we append zeros
     * then compress.  Then we can fall back to padding zeros and length
     * encoding like normal.
     */
    if (md->rmd160.curlen > 56) {
        while (md->rmd160.curlen < 64) {
            md->rmd160.buf[md->rmd160.curlen++] = (unsigned char)0;
        }
        rmd160_compress(md, md->rmd160.buf);
        md->rmd160.curlen = 0;
    }

    /* pad upto 56 bytes of zeroes */
    while (md->rmd160.curlen < 56) {
        md->rmd160.buf[md->rmd160.curlen++] = (unsigned char)0;
    }

    /* store length */
    STORE64L(md->rmd160.length, md->rmd160.buf+56);
    rmd160_compress(md, md->rmd160.buf);

    /* copy output */
    for (i = 0; i < 5; i++) {
        STORE32L(md->rmd160.state[i], hash+(4*i));
    }
#ifdef CLEAN_STACK
    zeromem(md, sizeof(hash_state));
#endif
    return CRYPT_OK;
}

int rmd160_test(void)
{
#ifndef LTC_TEST
   return CRYPT_NOP;
#else
   static const struct {
        char *msg;
        unsigned char md[20];
   } tests[] = {
   { "",
     { 0x9c, 0x11, 0x85, 0xa5, 0xc5, 0xe9, 0xfc, 0x54, 0x61, 0x28,
       0x08, 0x97, 0x7e, 0xe8, 0xf5, 0x48, 0xb2, 0x25, 0x8d, 0x31 }
   },
   { "a",
     { 0x0b, 0xdc, 0x9d, 0x2d, 0x25, 0x6b, 0x3e, 0xe9, 0xda, 0xae,
       0x34, 0x7b, 0xe6, 0xf4, 0xdc, 0x83, 0x5a, 0x46, 0x7f, 0xfe }
   },
   { "abc",
     { 0x8e, 0xb2, 0x08, 0xf7, 0xe0, 0x5d, 0x98, 0x7a, 0x9b, 0x04,
       0x4a, 0x8e, 0x98, 0xc6, 0xb0, 0x87, 0xf1, 0x5a, 0x0b, 0xfc }
   },
   { "message digest",
     { 0x5d, 0x06, 0x89, 0xef, 0x49, 0xd2, 0xfa, 0xe5, 0x72, 0xb8,
       0x81, 0xb1, 0x23, 0xa8, 0x5f, 0xfa, 0x21, 0x59, 0x5f, 0x36 }
   },
   { "abcdefghijklmnopqrstuvwxyz",
     { 0xf7, 0x1c, 0x27, 0x10, 0x9c, 0x69, 0x2c, 0x1b, 0x56, 0xbb,
       0xdc, 0xeb, 0x5b, 0x9d, 0x28, 0x65, 0xb3, 0x70, 0x8d, 0xbc }
   },
   { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
     { 0x12, 0xa0, 0x53, 0x38, 0x4a, 0x9c, 0x0c, 0x88, 0xe4, 0x05,
       0xa0, 0x6c, 0x27, 0xdc, 0xf4, 0x9a, 0xda, 0x62, 0xeb, 0x2b }
   }
   };
   int x;
   unsigned char buf[20];
   hash_state md;

   for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
       rmd160_init(&md);
       rmd160_process(&md, (unsigned char *)tests[x].msg, strlen(tests[x].msg));
       rmd160_done(&md, buf);
       if (memcmp(buf, tests[x].md, 20) != 0) {
#if 0
          printf("Failed test %d\n", x);
#endif
          return CRYPT_FAIL_TESTVECTOR;
       }
   }
   return CRYPT_OK;
#endif
}

#endif