MD5 algorithm RFC 1321
/***
* jwma Java WebMail
* Copyright (c) 2000-2003 jwma team
*
* jwma is free software; you can distribute and use this source
* under the terms of the BSD-style license received along with
* the distribution.
***/
/**
* This class implements the MD5 algorithm.
* <p>
* The specification is available from RFC 1321, and there are numerous
* implementations out there, this one was tuned specifically for hashing short
* strings (i.e. passwords).
* <p>
* I do not recommend to use this implementation for anything else but that, and
* if anybody feels that this code is to "close" to something available on the
* net, please contact me, and I will certainly take steps to clear up the
* situation.
*/
public final class MD5 {
/**
* Returns the MD5 hash digest transformed into a hex
* representation as <tt>String</tt>.
*
* @return the MD5 hash of the input as <tt>String</tt>.
*/
public static final String hash(String str) {
return MD5.asHex(MD5.digest(str.getBytes()));
}//hash
/**
* Returns the MD5 hash of the input data.
* <p>
* Following the the MD5 standard specification, the result
* is returned least significant byte first, however,
* many applications use the most significant byte first (more conventional).
*
* @param msg the <tt>byte[]</tt> to be digested.
*
* @return the MD5 hash of the data as <tt>String</tt>.
*/
public static final byte[] digest(byte[] msg) {
int padsize = (120 - (msg.length % 64)) % 64;
int i;
long l = msg.length * 8;
//MD5 registers
int a = 0x67452301, aa,
b = 0xefcdab89, bb,
c = 0x98badcfe, cc,
d = 0x10325476, dd;
byte[] src = new byte[msg.length + padsize + 8];
//padding
try {
System.arraycopy(msg, 0, src, 0, msg.length);
} catch (Exception ex) {
//should not happen, but calm's the compiler
}
src[msg.length] = (byte) 0x80;
for (i = msg.length + 1; i < msg.length + padsize; i++) src[i] = 0;
//append length
for (i = src.length - 8; i < src.length; i++) {
src[i] = (byte) l;
l >>>= 8;
}
int[] x = new int[16];
//prcess the data 16-word blocks
for (i = 0; i < src.length; i += 64) {
//construct block
for (int j = 0; j < 16; j++) {
x[j] = 0;
for (int k = 3; k >= 0; k--) {
x[j] <<= 8;
x[j] += src[i + j * 4 + k] & 0xff;
}
}
aa = a;
bb = b;
cc = c;
dd = d;
a = round1(a, b, c, d, 0, 7, 1, x);
d = round1(d, a, b, c, 1, 12, 2, x);
c = round1(c, d, a, b, 2, 17, 3, x);
b = round1(b, c, d, a, 3, 22, 4, x);
a = round1(a, b, c, d, 4, 7, 5, x);
d = round1(d, a, b, c, 5, 12, 6, x);
c = round1(c, d, a, b, 6, 17, 7, x);
b = round1(b, c, d, a, 7, 22, 8, x);
a = round1(a, b, c, d, 8, 7, 9, x);
d = round1(d, a, b, c, 9, 12, 10, x);
c = round1(c, d, a, b, 10, 17, 11, x);
b = round1(b, c, d, a, 11, 22, 12, x);
a = round1(a, b, c, d, 12, 7, 13, x);
d = round1(d, a, b, c, 13, 12, 14, x);
c = round1(c, d, a, b, 14, 17, 15, x);
b = round1(b, c, d, a, 15, 22, 16, x);
a = round2(a, b, c, d, 1, 5, 17, x);
d = round2(d, a, b, c, 6, 9, 18, x);
c = round2(c, d, a, b, 11, 14, 19, x);
b = round2(b, c, d, a, 0, 20, 20, x);
a = round2(a, b, c, d, 5, 5, 21, x);
d = round2(d, a, b, c, 10, 9, 22, x);
c = round2(c, d, a, b, 15, 14, 23, x);
b = round2(b, c, d, a, 4, 20, 24, x);
a = round2(a, b, c, d, 9, 5, 25, x);
d = round2(d, a, b, c, 14, 9, 26, x);
c = round2(c, d, a, b, 3, 14, 27, x);
b = round2(b, c, d, a, 8, 20, 28, x);
a = round2(a, b, c, d, 13, 5, 29, x);
d = round2(d, a, b, c, 2, 9, 30, x);
c = round2(c, d, a, b, 7, 14, 31, x);
b = round2(b, c, d, a, 12, 20, 32, x);
a = round3(a, b, c, d, 5, 4, 33, x);
d = round3(d, a, b, c, 8, 11, 34, x);
c = round3(c, d, a, b, 11, 16, 35, x);
b = round3(b, c, d, a, 14, 23, 36, x);
a = round3(a, b, c, d, 1, 4, 37, x);
d = round3(d, a, b, c, 4, 11, 38, x);
c = round3(c, d, a, b, 7, 16, 39, x);
b = round3(b, c, d, a, 10, 23, 40, x);
a = round3(a, b, c, d, 13, 4, 41, x);
d = round3(d, a, b, c, 0, 11, 42, x);
c = round3(c, d, a, b, 3, 16, 43, x);
b = round3(b, c, d, a, 6, 23, 44, x);
a = round3(a, b, c, d, 9, 4, 45, x);
d = round3(d, a, b, c, 12, 11, 46, x);
c = round3(c, d, a, b, 15, 16, 47, x);
b = round3(b, c, d, a, 2, 23, 48, x);
a = round4(a, b, c, d, 0, 6, 49, x);
d = round4(d, a, b, c, 7, 10, 50, x);
c = round4(c, d, a, b, 14, 15, 51, x);
b = round4(b, c, d, a, 5, 21, 52, x);
a = round4(a, b, c, d, 12, 6, 53, x);
d = round4(d, a, b, c, 3, 10, 54, x);
c = round4(c, d, a, b, 10, 15, 55, x);
b = round4(b, c, d, a, 1, 21, 56, x);
a = round4(a, b, c, d, 8, 6, 57, x);
d = round4(d, a, b, c, 15, 10, 58, x);
c = round4(c, d, a, b, 6, 15, 59, x);
b = round4(b, c, d, a, 13, 21, 60, x);
a = round4(a, b, c, d, 4, 6, 61, x);
d = round4(d, a, b, c, 11, 10, 62, x);
c = round4(c, d, a, b, 2, 15, 63, x);
b = round4(b, c, d, a, 9, 21, 64, x);
a += aa;
b += bb;
c += cc;
d += dd;
}
byte[] ret = new byte[16];
for (i = 0; i < 4; i++) {
ret[i] = (byte) a;
a >>>= 8;
}
for (; i < 8; i++) {
ret[i] = (byte) b;
b >>>= 8;
}
for (; i < 12; i++) {
ret[i] = (byte) c;
c >>>= 8;
}
for (; i < 16; i++) {
ret[i] = (byte) d;
d >>>= 8;
}
return ret;
}//digest
/** MD5 Transformation routines *********************************************/
private static final int rot(int x, int s) {
return x << s | x >>> (32 - s);
}//rot
private static final int F(int x, int y, int z) {
return (x & y) | (~x & z);
}//F
private static final int G(int x, int y, int z) {
return (x & z) | (y & ~z);
}//G
private static final int H(int x, int y, int z) {
return x ^ y ^ z;
}//H
private static final int I(int x, int y, int z) {
return y ^ (x | ~z);
}//I
private static final int round1(int a, int b, int c,
int d, int k, int s,
int i, int[] x) {
return b + rot((a + F(b, c, d) + x[k] + T[i - 1]), s);
}//round1
private static final int round2(int a, int b, int c,
int d, int k, int s,
int i, int[] x) {
return b + rot((a + G(b, c, d) + x[k] + T[i - 1]), s);
}//round2
private static final int round3(int a, int b, int c,
int d, int k, int s,
int i, int[] x) {
return b + rot((a + H(b, c, d) + x[k] + T[i - 1]), s);
}//round3
private static final int round4(int a, int b, int c,
int d, int k, int s,
int i, int[] x) {
return b + rot((a + I(b, c, d) + x[k] + T[i - 1]), s);
}//round4
private static final int T[] = {
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
};
/** END MD5 Transformation routines *****************************************/
/**
* Returns a <tt>String</tt> containing unsigned hexadecimal
* numbers as digits.
* <p>
* Contains two hex digit characters for each byte from the passed in
* <tt>byte[]</tt>.
*
* @param data the array of bytes to be converted into a hex-string.
* @return the generated hexadecimal representation as
* <tt>String</tt>.
*/
public static final String asHex(byte[] data) {
//double size, two bytes (hex range) for one byte
StringBuffer buf = new StringBuffer(data.length * 2);
for (int i = 0; i < data.length; i++) {
//don't forget the second hex digit
if (((int) data[i] & 0xff) < 0x10) {
buf.append("0");
}
buf.append(Long.toString((int) data[i] & 0xff, 16));
}
return buf.toString();
}//asHex
/**
* A main, to allow using this class from the command line.
*/
public static void main(String[] args) {
try {
if (args == null || args.length == 0) {
System.out.println("Usage: java dtw.webmail.util.MD5 <password>");
}
System.out.println("Hash=" + hash(args[0]));
} catch (Exception ex) {
ex.printStackTrace();
}
}//main
}//class MD5
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