pgpripemd160.c

来自「著名的加密软件的应用于电子邮件中」· C语言 代码 · 共 681 行 · 第 1/2 页

/*
* pgpRIPEMD160.c - European RIPE Message Digest, 160 bit (RIPEMD-160)
*
* The algorithm is by Hans Dobbertin, Antoon Bosselaers, and Bart Preneel.
*
* The code below is based on the reference implementation by Bosselaers.
* It is available at the time of writing from
* http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
*
* $Id: pgpRIPEMD160.c,v 1.1.2.3 1997/05/22 22:53:50 hal Exp $
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <string.h>

#include "pgpHash.h"
#include "pgpRIPEMD160.h"
#include "pgpUsuals.h"

#define RIPEMD160_BLOCKBYTES 64
#define RIPEMD160_BLOCKWORDS 16

#define RIPEMD160_HASHBYTES 20
#define RIPEMD160_HASHWORDS 5

struct RIPEMD160Context {
 word32 key[RIPEMD160_BLOCKWORDS];
 word32 iv[RIPEMD160_HASHWORDS];
 word32 bytesHi, bytesLo;
};


/* Define types used in the reference code based on PGP library types */

/* typedef byte byte;  [* unsigned 8-bit integer *] */
typedef word16  word;  /* unsigned 16-bit integer */
typedef word32  dword;  /* unsigned 32-bit integer */


/************************ File rmd160.h **********************/
/* Extracted from rmd160.h in the reference implementation */

/* macro definitions */

/* ROL(x, n) cyclically rotates x over n bits to the left */
/* x must be of an unsigned 32 bits type and 0 <= n < 32. */
#define ROL(x, n) (((x) << (n)) | ((x) >> (32-(n))))

/* the three 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 eight 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);\
}



/************************ File rmd160.c **********************/
/* Extracted from rmd160.c in the reference implementation */


/*
* initializes MDbuffer to "magic constants"
*/
static void RMDinit(dword *MDbuf)
{
MDbuf[0] = 0x67452301UL;
MDbuf[1] = 0xefcdab89UL;
MDbuf[2] = 0x98badcfeUL;
MDbuf[3] = 0x10325476UL;
MDbuf[4] = 0xc3d2e1f0UL;

return;
}


/*
* the compression function.
* transforms MDbuf using message bytes X[0] through X[15]
*/
static void RMDcompress(dword *MDbuf, dword *X)
{
	dword aa = MDbuf[0], bb = MDbuf[1], cc = MDbuf[2],
		dd = MDbuf[3], ee = MDbuf[4];
	dword aaa = MDbuf[0], bbb = MDbuf[1], ccc = MDbuf[2],
		ddd = MDbuf[3], eee = MDbuf[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 + MDbuf[1];	/* final result for MDbuf[0] */
	MDbuf[1] = MDbuf[2] + dd + eee;
	MDbuf[2] = MDbuf[3] + ee + aaa;
	MDbuf[3] = MDbuf[4] + aa + bbb;
	MDbuf[4] = MDbuf[0] + bb + ccc;
	MDbuf[0] = ddd;

	return;
}


/*
* puts bytes from strptr into X and pad out; appends length
* and finally, compresses the last block(s)
* note: length in bits == 8 * (lswlen + 2^32 mswlen).
* note: there are (lswlen mod 64) bytes left in strptr.
*/
static void RMDfinish(dword *MDbuf, byte *strptr, dword lswlen, dword mswlen)