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/*
* Implementation of RIPEMD-160.
*
* Copyright (C) 2014 Legimet <legimet.calc@gmail.com>
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL I LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL,
* INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS
* SOFTWARE AND ITS DOCUMENTATION, EVEN IF I HAVE BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* I SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
* I HAVE NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
* ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <stdint.h>
#include <string.h>
#include "rmdcommon.h"
#include "rmd160.h"
void ripemd160_MDinit(dword *MDbuf) {
MDbuf[0] = initvals[0];
MDbuf[1] = initvals[1];
MDbuf[2] = initvals[2];
MDbuf[3] = initvals[3];
MDbuf[4] = initvals[4];
}
static inline void ripemd160_round1(dword *a, dword *b, dword *c, dword *d, dword *e,
dword *ap, dword *bp, dword *cp, dword *dp, dword *ep, int i, dword *X) {
*a = rmd_rol(*a + rmd_f1(*b, *c, *d) + X[r[i]], s[i]) + *e;
*c = rmd_rol(*c, 10);
*ap = rmd_rol(*ap + rmd_f5(*bp, *cp, *dp) + X[rprime[i]] + kprime[0], sprime[i]) + *ep;
*cp = rmd_rol(*cp, 10);
}
static inline void ripemd160_round2(dword *a, dword *b, dword *c, dword *d, dword *e,
dword *ap, dword *bp, dword *cp, dword *dp, dword *ep, int i, dword *X) {
*a = rmd_rol(*a + rmd_f2(*b, *c, *d) + X[r[i]] + k[0], s[i]) + *e;
*c = rmd_rol(*c, 10);
*ap = rmd_rol(*ap + rmd_f4(*bp, *cp, *dp) + X[rprime[i]] + kprime[1], sprime[i]) + *ep;
*cp = rmd_rol(*cp, 10);
}
static inline void ripemd160_round3(dword *a, dword *b, dword *c, dword *d, dword *e,
dword *ap, dword *bp, dword *cp, dword *dp, dword *ep, int i, dword *X) {
*a = rmd_rol(*a + rmd_f3(*b, *c, *d) + X[r[i]] + k[1], s[i]) + *e;
*c = rmd_rol(*c, 10);
*ap = rmd_rol(*ap + rmd_f3(*bp, *cp, *dp) + X[rprime[i]] + kprime[2], sprime[i]) + *ep;
*cp = rmd_rol(*cp, 10);
}
static inline void ripemd160_round4(dword *a, dword *b, dword *c, dword *d, dword *e,
dword *ap, dword *bp, dword *cp, dword *dp, dword *ep, int i, dword *X) {
*a = rmd_rol(*a + rmd_f4(*b, *c, *d) + X[r[i]] + k[2], s[i]) + *e;
*c = rmd_rol(*c, 10);
*ap = rmd_rol(*ap + rmd_f2(*bp, *cp, *dp) + X[rprime[i]] + kprime[3], sprime[i]) + *ep;
*cp = rmd_rol(*cp, 10);
}
static inline void ripemd160_round5(dword *a, dword *b, dword *c, dword *d, dword *e,
dword *ap, dword *bp, dword *cp, dword *dp, dword *ep, int i, dword *X) {
*a = rmd_rol(*a + rmd_f5(*b, *c, *d) + X[r[i]] + k[3], s[i]) + *e;
*c = rmd_rol(*c, 10);
*ap = rmd_rol(*ap + rmd_f1(*bp, *cp, *dp) + X[rprime[i]], sprime[i]) + *ep;
*cp = rmd_rol(*cp, 10);
}
void ripemd160_compress(dword *MDbuf, dword *X) {
dword a = MDbuf[0], b = MDbuf[1], c = MDbuf[2], d = MDbuf[3], e = MDbuf[4];
dword ap = MDbuf[0], bp = MDbuf[1], cp = MDbuf[2], dp = MDbuf[3], ep = MDbuf[4];
int i;
for (i = 0; i < 15;) {
ripemd160_round1(&a, &b, &c, &d, &e, &ap, &bp, &cp, &dp, &ep, i++, X);
ripemd160_round1(&e, &a, &b, &c, &d, &ep, &ap, &bp, &cp, &dp, i++, X);
ripemd160_round1(&d, &e, &a, &b, &c, &dp, &ep, &ap, &bp, &cp, i++, X);
ripemd160_round1(&c, &d, &e, &a, &b, &cp, &dp, &ep, &ap, &bp, i++, X);
ripemd160_round1(&b, &c, &d, &e, &a, &bp, &cp, &dp, &ep, &ap, i++, X);
}
ripemd160_round1(&a, &b, &c, &d, &e, &ap, &bp, &cp, &dp, &ep, i++, X);
for (i = 16; i < 31;) {
ripemd160_round2(&e, &a, &b, &c, &d, &ep, &ap, &bp, &cp, &dp, i++, X);
ripemd160_round2(&d, &e, &a, &b, &c, &dp, &ep, &ap, &bp, &cp, i++, X);
ripemd160_round2(&c, &d, &e, &a, &b, &cp, &dp, &ep, &ap, &bp, i++, X);
ripemd160_round2(&b, &c, &d, &e, &a, &bp, &cp, &dp, &ep, &ap, i++, X);
ripemd160_round2(&a, &b, &c, &d, &e, &ap, &bp, &cp, &dp, &ep, i++, X);
}
ripemd160_round2(&e, &a, &b, &c, &d, &ep, &ap, &bp, &cp, &dp, i++, X);
for (i = 32; i < 47;) {
ripemd160_round3(&d, &e, &a, &b, &c, &dp, &ep, &ap, &bp, &cp, i++, X);
ripemd160_round3(&c, &d, &e, &a, &b, &cp, &dp, &ep, &ap, &bp, i++, X);
ripemd160_round3(&b, &c, &d, &e, &a, &bp, &cp, &dp, &ep, &ap, i++, X);
ripemd160_round3(&a, &b, &c, &d, &e, &ap, &bp, &cp, &dp, &ep, i++, X);
ripemd160_round3(&e, &a, &b, &c, &d, &ep, &ap, &bp, &cp, &dp, i++, X);
}
ripemd160_round3(&d, &e, &a, &b, &c, &dp, &ep, &ap, &bp, &cp, i++, X);
for (i = 48; i < 63;) {
ripemd160_round4(&c, &d, &e, &a, &b, &cp, &dp, &ep, &ap, &bp, i++, X);
ripemd160_round4(&b, &c, &d, &e, &a, &bp, &cp, &dp, &ep, &ap, i++, X);
ripemd160_round4(&a, &b, &c, &d, &e, &ap, &bp, &cp, &dp, &ep, i++, X);
ripemd160_round4(&e, &a, &b, &c, &d, &ep, &ap, &bp, &cp, &dp, i++, X);
ripemd160_round4(&d, &e, &a, &b, &c, &dp, &ep, &ap, &bp, &cp, i++, X);
}
ripemd160_round4(&c, &d, &e, &a, &b, &cp, &dp, &ep, &ap, &bp, i++, X);
for (i = 64; i < 79;) {
ripemd160_round5(&b, &c, &d, &e, &a, &bp, &cp, &dp, &ep, &ap, i++, X);
ripemd160_round5(&a, &b, &c, &d, &e, &ap, &bp, &cp, &dp, &ep, i++, X);
ripemd160_round5(&e, &a, &b, &c, &d, &ep, &ap, &bp, &cp, &dp, i++, X);
ripemd160_round5(&d, &e, &a, &b, &c, &dp, &ep, &ap, &bp, &cp, i++, X);
ripemd160_round5(&c, &d, &e, &a, &b, &cp, &dp, &ep, &ap, &bp, i++, X);
}
ripemd160_round5(&b, &c, &d, &e, &a, &bp, &cp, &dp, &ep, &ap, i, X);
c += MDbuf[1] + dp;
MDbuf[1] = MDbuf[2] + d + ep;
MDbuf[2] = MDbuf[3] + e + ap;
MDbuf[3] = MDbuf[4] + a + bp;
MDbuf[4] = MDbuf[0] + b + cp;
MDbuf[0] = c;
}
void ripemd160_MDfinish(dword *MDbuf, byte *strptr, dword lswlen, dword mswlen) {
dword X[16] = {0}; /* Initialize to all 0 */
dword i;
/* Copy bytes from strptr into X */
for (i = 0; i < (lswlen & 63); i++) {
X[i >> 2] |= (dword)strptr[i] << ((i & 3) << 3);
}
/* Add a 1 bit for padding */
X[i >> 2] |= 128 << ((i & 3) << 3);
/* length in bits is at least 448 mod 512, second block needed */
if ((lswlen & 63) >= 56) {
ripemd160_compress(MDbuf, X);
memset(X, 0, 64);
}
/* Append the 64-bit length in the last 2 words, low-order word first */
X[14] = lswlen << 3;
X[15] = (mswlen << 3) + (lswlen >> 29);
ripemd160_compress(MDbuf, X); /* Compress the final block */
}