| andrzej semeniuk 2004-04-25, 4:38 pm |
| hi,
i've been trying unsuccessfully to log in to yahoo from a java
application using an insecure connection
("http://login.yahoo.com/config/login") by mimicking the action of the
login web page javascript, that is hashing the password using md5
algorithm. i transcribed yahoo's md5 implementation from its web page
into java, and it appears to give me different results than java's md5
algorithm (i'm outputting the byte[] array from java's md5 and the
output of yahoo's md5 and their outputs are different). in either case
i would appreciate any help in finding what i'm doing wrong. below is
the code using java's md5 algorithm:
java.security.MessageDigest t_md5 =
java.security.MessageDigest.getInstance("MD5");
// composed hash=md5(md5(password)+challenge)
String t_password = "mypassword";
String t_challenge = "anychallengestring";
byte[] t_hash1 = t_md5.digest(t_password.getBytes());
byte[] t_hash2 = t_challenge.getBytes();
byte[] t_hash3 = new byte[t_hash1.length + t_hash2.length];
System.arraycopy(t_hash1,0,t_hash3,0,t_hash1.length);
System.arraycopy(t_hash2,0,t_hash3,t_hash1.length,t_hash2.length);
byte[] t_hash = t_md5.digest(t_hash3);
System.out.println(t_hash);
using yahoo's md5 algorithm (see below);
String t_hash = MD5(MD5(t_password)+t_challenge);
System.out.println(t_hash);
yahoo md5 algorithm from their web page:
/*
* A JavaScript implementation of the RSA Data Security, Inc. MD5
Message
* Digest Algorithm, as defined in RFC 1321.
* Copyright (C) Paul Johnston 1999 - 2000.
* Updated by Greg Holt 2000 - 2001.
* See http://pajhome.org.uk/site/legal.html for details.
*/
/*
* Convert a 32-bit number to a hex string with ls-byte first
*/
static public String hex_chr = "0123456789abcdef";
static public String rhex( int num )
{
String str = "";
for(int j = 0; j <= 3; j++)
str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) +
hex_chr.charAt((num >> (j * 8)) & 0x0F);
return str;
}
/*
* Convert a string to a sequence of 16-word blocks, stored as an
array.
* Append padding bits and the length, as described in the MD5
standard.
*/
static public int[] str2blks_MD5(String str)
{
int nblk = ((str.length() + 8) >> 6) + 1;
int[] blks = new int[nblk * 16];
for(int i = 0; i < nblk * 16; i++)
blks[i] = 0;
int i;
for(i = 0; i < str.length(); i++)
blks[i >> 2] |= str.charAt(i) << ((i % 4) * 8);
blks[i >> 2] |= 0x80 << ((i % 4) * 8);
blks[nblk * 16 - 2] = str.length() * 8;
return blks;
}
/*
* Add integers, wrapping at 2^32. This uses 16-bit operations
internally
* to work around bugs in some JS interpreters.
*/
static public int add(int x, int y)
{
int lsw = (x & 0xFFFF) + (y & 0xFFFF);
int msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left
*/
static public int rol(int num, int cnt)
{
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* These functions implement the basic operation for each round of
the
* algorithm.
*/
static public int cmn(int q, int a, int b, int x, int s, int t)
{
return add(rol(add(add(a, q), add(x, t)), s), b);
}
static public int ff(int a, int b, int c, int d, int x, int s, int
t)
{
return cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
static public int gg(int a, int b, int c, int d, int x, int s, int
t)
{
return cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
static public int hh(int a, int b, int c, int d, int x, int s, int
t)
{
return cmn(b ^ c ^ d, a, b, x, s, t);
}
static public int ii(int a, int b, int c, int d, int x, int s, int
t)
{
return cmn(c ^ (b | (~d)), a, b, x, s, t);
}
/*
* Take a string and return the hex representation of its MD5.
*/
static public String MD5(String str)
{
int[] x = str2blks_MD5(str);
int a = 1732584193;
int b = -271733879;
int c = -1732584194;
int d = 271733878;
for(int i = 0; i < x.length; i += 16)
{
int olda = a;
int oldb = b;
int oldc = c;
int oldd = d;
a = ff(a, b, c, d, x[i+ 0], 7 , -680876936);
d = ff(d, a, b, c, x[i+ 1], 12, -389564586);
c = ff(c, d, a, b, x[i+ 2], 17, 606105819);
b = ff(b, c, d, a, x[i+ 3], 22, -1044525330);
a = ff(a, b, c, d, x[i+ 4], 7 , -176418897);
d = ff(d, a, b, c, x[i+ 5], 12, 1200080426);
c = ff(c, d, a, b, x[i+ 6], 17, -1473231341);
b = ff(b, c, d, a, x[i+ 7], 22, -45705983);
a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
d = ff(d, a, b, c, x[i+ 9], 12, -1958414417);
c = ff(c, d, a, b, x[i+10], 17, -42063);
b = ff(b, c, d, a, x[i+11], 22, -1990404162);
a = ff(a, b, c, d, x[i+12], 7 , 1804603682);
d = ff(d, a, b, c, x[i+13], 12, -40341101);
c = ff(c, d, a, b, x[i+14], 17, -1502002290);
b = ff(b, c, d, a, x[i+15], 22, 1236535329);
a = gg(a, b, c, d, x[i+ 1], 5 , -165796510);
d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
c = gg(c, d, a, b, x[i+11], 14, 643717713);
b = gg(b, c, d, a, x[i+ 0], 20, -373897302);
a = gg(a, b, c, d, x[i+ 5], 5 , -701558691);
d = gg(d, a, b, c, x[i+10], 9 , 38016083);
c = gg(c, d, a, b, x[i+15], 14, -660478335);
b = gg(b, c, d, a, x[i+ 4], 20, -405537848);
a = gg(a, b, c, d, x[i+ 9], 5 , 568446438);
d = gg(d, a, b, c, x[i+14], 9 , -1019803690);
c = gg(c, d, a, b, x[i+ 3], 14, -187363961);
b = gg(b, c, d, a, x[i+ 8], 20, 1163531501);
a = gg(a, b, c, d, x[i+13], 5 , -1444681467);
d = gg(d, a, b, c, x[i+ 2], 9 , -51403784);
c = gg(c, d, a, b, x[i+ 7], 14, 1735328473);
b = gg(b, c, d, a, x[i+12], 20, -1926607734);
a = hh(a, b, c, d, x[i+ 5], 4 , -378558);
d = hh(d, a, b, c, x[i+ 8], 11, -2022574463);
c = hh(c, d, a, b, x[i+11], 16, 1839030562);
b = hh(b, c, d, a, x[i+14], 23, -35309556);
a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
d = hh(d, a, b, c, x[i+ 4], 11, 1272893353);
c = hh(c, d, a, b, x[i+ 7], 16, -155497632);
b = hh(b, c, d, a, x[i+10], 23, -1094730640);
a = hh(a, b, c, d, x[i+13], 4 , 681279174);
d = hh(d, a, b, c, x[i+ 0], 11, -358537222);
c = hh(c, d, a, b, x[i+ 3], 16, -722521979);
b = hh(b, c, d, a, x[i+ 6], 23, 76029189);
a = hh(a, b, c, d, x[i+ 9], 4 , -640364487);
d = hh(d, a, b, c, x[i+12], 11, -421815835);
c = hh(c, d, a, b, x[i+15], 16, 530742520);
b = hh(b, c, d, a, x[i+ 2], 23, -995338651);
a = ii(a, b, c, d, x[i+ 0], 6 , -198630844);
d = ii(d, a, b, c, x[i+ 7], 10, 1126891415);
c = ii(c, d, a, b, x[i+14], 15, -1416354905);
b = ii(b, c, d, a, x[i+ 5], 21, -57434055);
a = ii(a, b, c, d, x[i+12], 6 , 1700485571);
d = ii(d, a, b, c, x[i+ 3], 10, -1894986606);
c = ii(c, d, a, b, x[i+10], 15, -1051523);
b = ii(b, c, d, a, x[i+ 1], 21, -2054922799);
a = ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
d = ii(d, a, b, c, x[i+15], 10, -30611744);
c = ii(c, d, a, b, x[i+ 6], 15, -1560198380);
b = ii(b, c, d, a, x[i+13], 21, 1309151649);
a = ii(a, b, c, d, x[i+ 4], 6 , -145523070);
d = ii(d, a, b, c, x[i+11], 10, -1120210379);
c = ii(c, d, a, b, x[i+ 2], 15, 718787259);
b = ii(b, c, d, a, x[i+ 9], 21, -343485551);
a = add(a, olda);
b = add(b, oldb);
c = add(c, oldc);
d = add(d, oldd);
}
return rhex(a) + rhex(b) + rhex(c) + rhex(d);
}
}
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