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/* rmd160.c - RIPE-MD160
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "util.h"
#include "memory.h"
#include "rmd.h"
/*********************************
* RIPEMD-160 is not patented, see (as of 25.10.97)
* http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
* Note that the code uses Little Endian byteorder, which is good for
* 386 etc, but we must add some conversion when used on a big endian box.
*
*
* Pseudo-code for RIPEMD-160
*
* RIPEMD-160 is an iterative hash function that operates on 32-bit words.
* The round function takes as input a 5-word chaining variable and a 16-word
* message block and maps this to a new chaining variable. All operations are
* defined on 32-bit words. Padding is identical to that of MD4.
*
*
* RIPEMD-160: definitions
*
*
* nonlinear functions at bit level: exor, mux, -, mux, -
*
* f(j, x, y, z) = x XOR y XOR z (0 <= j <= 15)
* f(j, x, y, z) = (x AND y) OR (NOT(x) AND z) (16 <= j <= 31)
* f(j, x, y, z) = (x OR NOT(y)) XOR z (32 <= j <= 47)
* f(j, x, y, z) = (x AND z) OR (y AND NOT(z)) (48 <= j <= 63)
* f(j, x, y, z) = x XOR (y OR NOT(z)) (64 <= j <= 79)
*
*
* added constants (hexadecimal)
*
* K(j) = 0x00000000 (0 <= j <= 15)
* K(j) = 0x5A827999 (16 <= j <= 31) int(2**30 x sqrt(2))
* K(j) = 0x6ED9EBA1 (32 <= j <= 47) int(2**30 x sqrt(3))
* K(j) = 0x8F1BBCDC (48 <= j <= 63) int(2**30 x sqrt(5))
* K(j) = 0xA953FD4E (64 <= j <= 79) int(2**30 x sqrt(7))
* K'(j) = 0x50A28BE6 (0 <= j <= 15) int(2**30 x cbrt(2))
* K'(j) = 0x5C4DD124 (16 <= j <= 31) int(2**30 x cbrt(3))
* K'(j) = 0x6D703EF3 (32 <= j <= 47) int(2**30 x cbrt(5))
* K'(j) = 0x7A6D76E9 (48 <= j <= 63) int(2**30 x cbrt(7))
* K'(j) = 0x00000000 (64 <= j <= 79)
*
*
* selection of message word
*
* r(j) = j (0 <= j <= 15)
* r(16..31) = 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8
* r(32..47) = 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12
* r(48..63) = 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2
* r(64..79) = 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
* r0(0..15) = 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12
* r0(16..31)= 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2
* r0(32..47)= 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13
* r0(48..63)= 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14
* r0(64..79)= 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
*
*
* amount for rotate left (rol)
*
* s(0..15) = 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8
* s(16..31) = 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12
* s(32..47) = 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5
* s(48..63) = 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12
* s(64..79) = 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
* s'(0..15) = 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6
* s'(16..31)= 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11
* s'(32..47)= 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5
* s'(48..63)= 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8
* s'(64..79)= 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
*
*
* initial value (hexadecimal)
*
* h0 = 0x67452301; h1 = 0xEFCDAB89; h2 = 0x98BADCFE; h3 = 0x10325476;
* h4 = 0xC3D2E1F0;
*
*
* RIPEMD-160: pseudo-code
*
* It is assumed that the message after padding consists of t 16-word blocks
* that will be denoted with X[i][j], with 0 <= i <= t-1 and 0 <= j <= 15.
* The symbol [+] denotes addition modulo 2**32 and rol_s denotes cyclic left
* shift (rotate) over s positions.
*
*
* for i := 0 to t-1 {
* A := h0; B := h1; C := h2; D = h3; E = h4;
* A' := h0; B' := h1; C' := h2; D' = h3; E' = h4;
* for j := 0 to 79 {
* T := rol_s(j)(A [+] f(j, B, C, D) [+] X[i][r(j)] [+] K(j)) [+] E;
* A := E; E := D; D := rol_10(C); C := B; B := T;
* T := rol_s'(j)(A' [+] f(79-j, B', C', D') [+] X[i][r'(j)]
[+] K'(j)) [+] E';
* A' := E'; E' := D'; D' := rol_10(C'); C' := B'; B' := T;
* }
* T := h1 [+] C [+] D'; h1 := h2 [+] D [+] E'; h2 := h3 [+] E [+] A';
* h3 := h4 [+] A [+] B'; h4 := h0 [+] B [+] C'; h0 := T;
* }
*/
/* Some examples:
* "" 9c1185a5c5e9fc54612808977ee8f548b2258d31
* "a" 0bdc9d2d256b3ee9daae347be6f4dc835a467ffe
* "abc" 8eb208f7e05d987a9b044a8e98c6b087f15a0bfc
* "message digest" 5d0689ef49d2fae572b881b123a85ffa21595f36
* "a...z" f71c27109c692c1b56bbdceb5b9d2865b3708dbc
* "abcdbcde...nopq" 12a053384a9c0c88e405a06c27dcf49ada62eb2b
* "A...Za...z0...9" b0e20b6e3116640286ed3a87a5713079b21f5189
* 8 times "1234567890" 9b752e45573d4b39f4dbd3323cab82bf63326bfb
* 1 million times "a" 52783243c1697bdbe16d37f97f68f08325dc1528
*/
void
rmd160_init( RMD160_CONTEXT *hd )
{
hd->h0 = 0x67452301;
hd->h1 = 0xEFCDAB89;
hd->h2 = 0x98BADCFE;
hd->h3 = 0x10325476;
hd->h4 = 0xC3D2E1F0;
hd->nblocks = 0;
hd->count = 0;
}
#if defined(__GNUC__) && defined(__i386__)
static inline u32
rol(int n, u32 x)
{
__asm__("roll %%cl,%0"
:"=r" (x)
:"0" (x),"c" (n));
return x;
}
#else
#define rol(n,x) ( ((x) << (n)) | ((x) >> (32-(n))) )
#endif
/****************
* Transform the message X which consists of 16 32-bit-words
*/
static void
transform( RMD160_CONTEXT *hd, byte *data )
{
static int r[80] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13 };
static int rr[80] = {
5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11 };
static int s[80] = {
11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6 };
static int ss[80] = {
8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11 };
u32 a,b,c,d,e,aa,bb,cc,dd,ee,t;
int rbits, j;
#ifdef BIG_ENDIAN_HOST
u32 x[16];
#else
u32 *x;
#endif
#define K(a) ( (a) < 16 ? 0x00000000 : \
(a) < 32 ? 0x5A827999 : \
(a) < 48 ? 0x6ED9EBA1 : \
(a) < 64 ? 0x8F1BBCDC : 0xA953FD4E )
#define KK(a) ( (a) < 16 ? 0x50A28BE6 : \
(a) < 32 ? 0x5C4DD124 : \
(a) < 48 ? 0x6D703EF3 : \
(a) < 64 ? 0x7A6D76E9 : 0x00000000 )
#define F0(x,y,z) ( (x) ^ (y) ^ (z) )
#define F1(x,y,z) ( ((x) & (y)) | (~(x) & (z)) )
#define F2(x,y,z) ( ((x) | ~(y)) ^ (z) )
#define F3(x,y,z) ( ((x) & (z)) | ((y) & ~(z)) )
#define F4(x,y,z) ( (x) ^ ((y) | ~(z)) )
#define F(a,x,y,z) ( (a) < 16 ? F0((x),(y),(z)) : \
(a) < 32 ? F1((x),(y),(z)) : \
(a) < 48 ? F2((x),(y),(z)) : \
(a) < 64 ? F3((x),(y),(z)) : \
F4((x),(y),(z)) )
#ifdef BIG_ENDIAN_HOST
{ int i;
byte *p2, *p1;
for(i=0, p1=data, p2=(byte*)x; i < 16; i++, p2 += 4 ) {
p2[3] = *p1++;
p2[2] = *p1++;
p2[1] = *p1++;
p2[0] = *p1++;
}
}
#else
x = (u32*)data;
#endif
a = aa = hd->h0;
b = bb = hd->h1;
c = cc = hd->h2;
d = dd = hd->h3;
e = ee = hd->h4;
for(j=0; j < 80; j++ ) {
t = a + F( j, b, c, d ) + x[ r[j] ] + K(j);
rbits = s[j];
a = rol(rbits, t) + e;
c = rol(10,c);
t = a; a = e; e = d; d = c; c = b; b = t;
t = aa + F(79-j, bb, cc, dd ) + x[ rr[j] ] + KK(j);
rbits = ss[j];
aa = rol(rbits, t) + ee;
cc = rol(10,cc);
t = aa; aa = ee; ee = dd; dd = cc; cc = bb; bb = t;
}
t = hd->h1 + c + dd;
hd->h1 = hd->h2 + d + ee;
hd->h2 = hd->h3 + e + aa;
hd->h3 = hd->h4 + a + bb;
hd->h4 = hd->h0 + b + cc;
hd->h0 = t;
}
/* Update the message digest with the contents
* of INBUF with length INLEN.
*/
void
rmd160_write( RMD160_CONTEXT *hd, byte *inbuf, size_t inlen)
{
if( hd->count == 64 ) { /* flush the buffer */
transform( hd, hd->buf );
hd->count = 0;
hd->nblocks++;
}
if( !inbuf )
return;
if( hd->count ) {
for( ; inlen && hd->count < 64; inlen-- )
hd->buf[hd->count++] = *inbuf++;
rmd160_write( hd, NULL, 0 );
if( !inlen )
return;
}
while( inlen >= 64 ) {
transform( hd, inbuf );
hd->count = 0;
hd->nblocks++;
inlen -= 64;
inbuf += 64;
}
for( ; inlen && hd->count < 64; inlen-- )
hd->buf[hd->count++] = *inbuf++;
}
/****************
* Apply the rmd160 transform function on the buffer which must have
* a length 64 bytes. Do not use this function together with the
* other functions, use rmd160_init to initialize intzernal variables.
* Returns: 16 bytes in buffer with the mixed contentes of buffer.
*/
void
rmd160_mixblock( RMD160_CONTEXT *hd, char *buffer )
{
char *p = buffer;
transform( hd, buffer );
#define X(a) do { *(u32*)p = hd->h##a ; p += 4; } while(0)
X(0);
X(1);
X(2);
X(3);
X(4);
#undef X
}
/* The routine terminates the computation
*/
void
rmd160_final( RMD160_CONTEXT *hd )
{
u32 t, msb, lsb;
byte *p;
rmd160_write(hd, NULL, 0); /* flush */;
msb = 0;
t = hd->nblocks;
if( (lsb = t << 6) < t ) /* multiply by 64 to make a byte count */
msb++;
msb += t >> 26;
t = lsb;
if( (lsb = t + hd->count) < t ) /* add the count */
msb++;
t = lsb;
if( (lsb = t << 3) < t ) /* multiply by 8 to make a bit count */
msb++;
msb += t >> 29;
if( hd->count < 56 ) { /* enough room */
hd->buf[hd->count++] = 0x80; /* pad */
while( hd->count < 56 )
hd->buf[hd->count++] = 0; /* pad */
}
else { /* need one extra block */
hd->buf[hd->count++] = 0x80; /* pad character */
while( hd->count < 64 )
hd->buf[hd->count++] = 0;
rmd160_write(hd, NULL, 0); /* flush */;
memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
}
/* append the 64 bit count */
hd->buf[56] = lsb ;
hd->buf[57] = lsb >> 8;
hd->buf[58] = lsb >> 16;
hd->buf[59] = lsb >> 24;
hd->buf[60] = msb ;
hd->buf[61] = msb >> 8;
hd->buf[62] = msb >> 16;
hd->buf[63] = msb >> 24;
transform( hd, hd->buf );
p = hd->buf;
#ifdef BIG_ENDIAN_HOST
#define X(a) do { *p++ = hd->h##a ; *p++ = hd->h##a >> 8; \
*p++ = hd->h##a >> 16; *p++ = hd->h##a >> 24; } while(0)
#else /* little endian */
#define X(a) do { *(u32*)p = hd->h##a ; p += 4; } while(0)
#endif
X(0);
X(1);
X(2);
X(3);
X(4);
#undef X
}

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