OpenSolaris_b135/grub/grub-0.97/stage2/md5.c
/* md5.c - an implementation of the MD5 algorithm and MD5 crypt */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
*
* This program 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.
*
* This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* See RFC 1321 for a description of the MD5 algorithm.
*/
#include <md5.h>
#ifndef TEST
# include <shared.h>
#endif
#ifdef TEST
# include <string.h>
# define USE_MD5_PASSWORDS
# define USE_MD5
#endif
#ifdef USE_MD5_PASSWORDS
# define USE_MD5
#endif
#ifdef USE_MD5
#define cpu_to_le32(x) (x)
#define le32_to_cpu(x) cpu_to_le32(x)
typedef unsigned int UINT4;
/* F, G, H and I are basic MD5 functions.
*/
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))
/* ROTATE_LEFT rotates x left n bits.
*/
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x >> (32 - (n)))))
static UINT4 initstate[4] =
{
0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476
};
static char s1[4] = { 7, 12, 17, 22 };
static char s2[4] = { 5, 9, 14, 20 };
static char s3[4] = { 4, 11, 16, 23 };
static char s4[4] = { 6, 10, 15, 21 };
static UINT4 T[64] =
{
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
};
static const char *b64t =
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
static UINT4 state[4];
static unsigned int length;
static unsigned char buffer[64];
static void
md5_transform (const unsigned char block[64])
{
int i, j;
UINT4 a,b,c,d,tmp;
const UINT4 *x = (UINT4 *) block;
a = state[0];
b = state[1];
c = state[2];
d = state[3];
/* Round 1 */
for (i = 0; i < 16; i++)
{
tmp = a + F (b, c, d) + le32_to_cpu (x[i]) + T[i];
tmp = ROTATE_LEFT (tmp, s1[i & 3]);
tmp += b;
a = d; d = c; c = b; b = tmp;
}
/* Round 2 */
for (i = 0, j = 1; i < 16; i++, j += 5)
{
tmp = a + G (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+16];
tmp = ROTATE_LEFT (tmp, s2[i & 3]);
tmp += b;
a = d; d = c; c = b; b = tmp;
}
/* Round 3 */
for (i = 0, j = 5; i < 16; i++, j += 3)
{
tmp = a + H (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+32];
tmp = ROTATE_LEFT (tmp, s3[i & 3]);
tmp += b;
a = d; d = c; c = b; b = tmp;
}
/* Round 4 */
for (i = 0, j = 0; i < 16; i++, j += 7)
{
tmp = a + I (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+48];
tmp = ROTATE_LEFT (tmp, s4[i & 3]);
tmp += b;
a = d; d = c; c = b; b = tmp;
}
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
}
static void
md5_init(void)
{
memcpy ((char *) state, (char *) initstate, sizeof (initstate));
length = 0;
}
static void
md5_update (const char *input, int inputlen)
{
int buflen = length & 63;
length += inputlen;
if (buflen + inputlen < 64)
{
memcpy (buffer + buflen, input, inputlen);
buflen += inputlen;
return;
}
memcpy (buffer + buflen, input, 64 - buflen);
md5_transform (buffer);
input += 64 - buflen;
inputlen -= 64 - buflen;
while (inputlen >= 64)
{
md5_transform (input);
input += 64;
inputlen -= 64;
}
memcpy (buffer, input, inputlen);
buflen = inputlen;
}
static unsigned char *
md5_final()
{
int i, buflen = length & 63;
buffer[buflen++] = 0x80;
memset (buffer+buflen, 0, 64 - buflen);
if (buflen > 56)
{
md5_transform (buffer);
memset (buffer, 0, 64);
buflen = 0;
}
*(UINT4 *) (buffer + 56) = cpu_to_le32 (8 * length);
*(UINT4 *) (buffer + 60) = 0;
md5_transform (buffer);
for (i = 0; i < 4; i++)
state[i] = cpu_to_le32 (state[i]);
return (unsigned char *) state;
}
#ifdef USE_MD5_PASSWORDS
/* If CHECK is true, check a password for correctness. Returns 0
if password was correct, and a value != 0 for error, similarly
to strcmp.
If CHECK is false, crypt KEY and save the result in CRYPTED.
CRYPTED must have a salt. */
int
md5_password (const char *key, char *crypted, int check)
{
int keylen = strlen (key);
char *salt = crypted + 3; /* skip $1$ header */
char *p;
int saltlen;
int i, n;
unsigned char alt_result[16];
unsigned char *digest;
if (check)
{
/* If our crypted password isn't 3 chars, then it can't be md5
crypted. So, they don't match. */
if (strlen(crypted) <= 3)
return 1;
saltlen = strstr (salt, "$") - salt;
}
else
{
char *end = strstr (salt, "$");
if (end && end - salt < 8)
saltlen = end - salt;
else
saltlen = 8;
salt[saltlen] = '$';
}
md5_init ();
md5_update (key, keylen);
md5_update (salt, saltlen);
md5_update (key, keylen);
digest = md5_final ();
memcpy (alt_result, digest, 16);
memcpy ((char *) state, (char *) initstate, sizeof (initstate));
length = 0;
md5_update (key, keylen);
md5_update (crypted, 3 + saltlen); /* include the $1$ header */
for (i = keylen; i > 16; i -= 16)
md5_update (alt_result, 16);
md5_update (alt_result, i);
for (i = keylen; i > 0; i >>= 1)
md5_update (key + ((i & 1) ? keylen : 0), 1);
digest = md5_final ();
for (i = 0; i < 1000; i++)
{
memcpy (alt_result, digest, 16);
memcpy ((char *) state, (char *) initstate, sizeof (initstate));
length = 0;
if ((i & 1) != 0)
md5_update (key, keylen);
else
md5_update (alt_result, 16);
if (i % 3 != 0)
md5_update (salt, saltlen);
if (i % 7 != 0)
md5_update (key, keylen);
if ((i & 1) != 0)
md5_update (alt_result, 16);
else
md5_update (key, keylen);
digest = md5_final ();
}
p = salt + saltlen + 1;
for (i = 0; i < 5; i++)
{
unsigned int w =
digest[i == 4 ? 5 : 12+i] | (digest[6+i] << 8) | (digest[i] << 16);
for (n = 4; n-- > 0;)
{
if (check)
{
if (*p++ != b64t[w & 0x3f])
return 1;
}
else
{
*p++ = b64t[w & 0x3f];
}
w >>= 6;
}
}
{
unsigned int w = digest[11];
for (n = 2; n-- > 0;)
{
if (check)
{
if (*p++ != b64t[w & 0x3f])
return 1;
}
else
{
*p++ = b64t[w & 0x3f];
}
w >>= 6;
}
}
if (! check)
*p = '\0';
return *p;
}
#endif
#ifdef TEST
static char *
md5 (const char *input)
{
memcpy ((char *) state, (char *) initstate, sizeof (initstate));
length = 0;
md5_update (input, strlen (input));
return md5_final ();
}
static void
test (char *buffer, char *expected)
{
char result[16 * 3 +1];
unsigned char* digest = md5 (buffer);
int i;
for (i=0; i < 16; i++)
sprintf (result+2*i, "%02x", digest[i]);
if (strcmp (result, expected))
printf ("MD5(%s) failed: %s\n", buffer, result);
else
printf ("MD5(%s) OK\n", buffer);
}
int
main (void)
{
test ("", "d41d8cd98f00b204e9800998ecf8427e");
test ("a", "0cc175b9c0f1b6a831c399e269772661");
test ("abc", "900150983cd24fb0d6963f7d28e17f72");
test ("message digest", "f96b697d7cb7938d525a2f31aaf161d0");
test ("abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b");
test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
"d174ab98d277d9f5a5611c2c9f419d9f");
test ("12345678901234567890123456789012345678901234567890123456789012345678901234567890",
"57edf4a22be3c955ac49da2e2107b67a");
test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz3456",
"6831fa90115bb9a54fbcd4f9fee0b5c4");
test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz345",
"bc40505cc94a43b7ff3e2ac027325233");
test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz34567",
"fa94b73a6f072a0239b52acacfbcf9fa");
test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz345678901234",
"bd201eae17f29568927414fa326f1267");
test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz34567890123",
"80063db1e6b70a2e91eac903f0e46b85");
if (check_md5_password ("Hello world!",
"$1$saltstri$YMyguxXMBpd2TEZ.vS/3q1"))
printf ("Password differs\n");
else
printf ("Password OK\n");
return 0;
}
#endif
#endif