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/*
* lib/crypto/md4/md4.c
*/
/*
**********************************************************************
** md4.c **
** RSA Data Security, Inc. MD4 Message Digest Algorithm **
** Created: 2/17/90 RLR **
** Revised: 1/91 SRD,AJ,BSK,JT Reference C Version **
**********************************************************************
*/
/*
**********************************************************************
** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved. **
** **
** License to copy and use this software is granted provided that **
** it is identified as the "RSA Data Security, Inc. MD4 Message **
** Digest Algorithm" in all material mentioning or referencing this **
** software or this function. **
** **
** License is also granted to make and use derivative works **
** provided that such works are identified as "derived from the RSA **
** Data Security, Inc. MD4 Message Digest Algorithm" in all **
** material mentioning or referencing the derived work. **
** **
** RSA Data Security, Inc. makes no representations concerning **
** either the merchantability of this software or the suitability **
** of this software for any particular purpose. It is provided "as **
** is" without express or implied warranty of any kind. **
** **
** These notices must be retained in any copies of any part of this **
** documentation and/or software. **
**********************************************************************
*/
#include "k5-int.h"
#include "rsa-md4.h"
/* forward declaration */
static void Transform (krb5_ui_4 FAR *, krb5_ui_4 FAR *);
static const unsigned char PADDING[64] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
/* F, G and H are basic MD4 functions: selection, majority, parity */
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
/* ROTATE_LEFT rotates x left n bits */
#define ROTATE_LEFT(x, n) ((((x) << (n)) & 0xffffffff) | ((x) >> (32-(n))))
/* FF, GG and HH are MD4 transformations for rounds 1, 2 and 3 */
/* Rotation is separate from addition to prevent recomputation */
#define FF(a, b, c, d, x, s) \
{(a) += F ((b), (c), (d)) + (x); \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s));}
#define GG(a, b, c, d, x, s) \
{(a) += G ((b), (c), (d)) + (x) + 013240474631UL; \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s));}
#define HH(a, b, c, d, x, s) \
{(a) += H ((b), (c), (d)) + (x) + 015666365641UL; \
(a) &= 0xffffffff; \
(a) = ROTATE_LEFT ((a), (s));}
void
krb5_MD4Init (mdContext)
krb5_MD4_CTX FAR *mdContext;
{
mdContext->i[0] = mdContext->i[1] = (krb5_ui_4)0;
/* Load magic initialization constants.
*/
mdContext->buf[0] = 0x67452301UL;
mdContext->buf[1] = 0xefcdab89UL;
mdContext->buf[2] = 0x98badcfeUL;
mdContext->buf[3] = 0x10325476UL;
}
void
krb5_MD4Update (mdContext, inBuf, inLen)
krb5_MD4_CTX FAR *mdContext;
const unsigned char FAR *inBuf;
unsigned int inLen;
{
krb5_ui_4 in[16];
int mdi;
unsigned int i, ii;
/* compute number of bytes mod 64 */
mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
/* update number of bits */
if ((mdContext->i[0] + ((krb5_ui_4)inLen << 3)) < mdContext->i[0])
mdContext->i[1]++;
mdContext->i[0] += ((krb5_ui_4)inLen << 3);
mdContext->i[1] += ((krb5_ui_4)inLen >> 29);
while (inLen--) {
/* add new character to buffer, increment mdi */
mdContext->in[mdi++] = *inBuf++;
/* transform if necessary */
if (mdi == 0x40) {
for (i = 0, ii = 0; i < 16; i++, ii += 4)
in[i] = (((krb5_ui_4)mdContext->in[ii+3]) << 24) |
(((krb5_ui_4)mdContext->in[ii+2]) << 16) |
(((krb5_ui_4)mdContext->in[ii+1]) << 8) |
((krb5_ui_4)mdContext->in[ii]);
Transform (mdContext->buf, in);
mdi = 0;
}
}
}
void
krb5_MD4Final (mdContext)
krb5_MD4_CTX FAR *mdContext;
{
krb5_ui_4 in[16];
int mdi;
unsigned int i, ii;
unsigned int padLen;
/* save number of bits */
in[14] = mdContext->i[0];
in[15] = mdContext->i[1];
/* compute number of bytes mod 64 */
mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
/* pad out to 56 mod 64 */
padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
krb5_MD4Update (mdContext, PADDING, padLen);
/* append length in bits and transform */
for (i = 0, ii = 0; i < 14; i++, ii += 4)
in[i] = (((krb5_ui_4)mdContext->in[ii+3]) << 24) |
(((krb5_ui_4)mdContext->in[ii+2]) << 16) |
(((krb5_ui_4)mdContext->in[ii+1]) << 8) |
((krb5_ui_4)mdContext->in[ii]);
Transform (mdContext->buf, in);
/* store buffer in digest */
for (i = 0, ii = 0; i < 4; i++, ii += 4) {
mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
mdContext->digest[ii+1] =
(unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
mdContext->digest[ii+2] =
(unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
mdContext->digest[ii+3] =
(unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
}
}
/* Basic MD4 step. Transform buf based on in.
*/
static void Transform (buf, in)
krb5_ui_4 FAR *buf;
krb5_ui_4 FAR *in;
{
register krb5_ui_4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
/* Round 1 */
FF (a, b, c, d, in[ 0], 3);
FF (d, a, b, c, in[ 1], 7);
FF (c, d, a, b, in[ 2], 11);
FF (b, c, d, a, in[ 3], 19);
FF (a, b, c, d, in[ 4], 3);
FF (d, a, b, c, in[ 5], 7);
FF (c, d, a, b, in[ 6], 11);
FF (b, c, d, a, in[ 7], 19);
FF (a, b, c, d, in[ 8], 3);
FF (d, a, b, c, in[ 9], 7);
FF (c, d, a, b, in[10], 11);
FF (b, c, d, a, in[11], 19);
FF (a, b, c, d, in[12], 3);
FF (d, a, b, c, in[13], 7);
FF (c, d, a, b, in[14], 11);
FF (b, c, d, a, in[15], 19);
/* Round 2 */
GG (a, b, c, d, in[ 0], 3);
GG (d, a, b, c, in[ 4], 5);
GG (c, d, a, b, in[ 8], 9);
GG (b, c, d, a, in[12], 13);
GG (a, b, c, d, in[ 1], 3);
GG (d, a, b, c, in[ 5], 5);
GG (c, d, a, b, in[ 9], 9);
GG (b, c, d, a, in[13], 13);
GG (a, b, c, d, in[ 2], 3);
GG (d, a, b, c, in[ 6], 5);
GG (c, d, a, b, in[10], 9);
GG (b, c, d, a, in[14], 13);
GG (a, b, c, d, in[ 3], 3);
GG (d, a, b, c, in[ 7], 5);
GG (c, d, a, b, in[11], 9);
GG (b, c, d, a, in[15], 13);
/* Round 3 */
HH (a, b, c, d, in[ 0], 3);
HH (d, a, b, c, in[ 8], 9);
HH (c, d, a, b, in[ 4], 11);
HH (b, c, d, a, in[12], 15);
HH (a, b, c, d, in[ 2], 3);
HH (d, a, b, c, in[10], 9);
HH (c, d, a, b, in[ 6], 11);
HH (b, c, d, a, in[14], 15);
HH (a, b, c, d, in[ 1], 3);
HH (d, a, b, c, in[ 9], 9);
HH (c, d, a, b, in[ 5], 11);
HH (b, c, d, a, in[13], 15);
HH (a, b, c, d, in[ 3], 3);
HH (d, a, b, c, in[11], 9);
HH (c, d, a, b, in[ 7], 11);
HH (b, c, d, a, in[15], 15);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
/*
**********************************************************************
** End of md4.c **
******************************* (cut) ********************************
*/
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