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/*-------------------------------------------------------------------------
*
* MD5Digest.java
* MD5-based utility function to obfuscate passwords before network
* transmission
*
* Copyright (c) 2003, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/jdbc/org/postgresql/util/Attic/MD5Digest.java,v 1.5 2003/03/07 18:39:46 barry Exp $
*
*-------------------------------------------------------------------------
*/
package org.postgresql.util;
/*
* @author Jeremy Wohl
*/
import java.security.*;
public class MD5Digest
{
private MD5Digest()
{}
/*
* Encodes user/password/salt information in the following way:
* MD5(MD5(password + user) + salt)
*
* @param user The connecting user.
* @param password The connecting user's password.
* @param salt A four-salt sent by the server.
*
* @return A 35-byte array, comprising the string "md5" and an MD5 digest.
*/
public static byte[] encode(String user, String password, byte []salt)
{
MessageDigest md;
byte[] temp_digest, pass_digest;
byte[] hex_digest = new byte[35];
try
{
md = MessageDigest.getInstance("MD5");
md.update(password.getBytes());
md.update(user.getBytes());
temp_digest = md.digest();
bytesToHex(temp_digest, hex_digest, 0);
md.update(hex_digest, 0, 32);
md.update(salt);
pass_digest = md.digest();
bytesToHex(pass_digest, hex_digest, 3);
hex_digest[0] = (byte) 'm';
hex_digest[1] = (byte) 'd';
hex_digest[2] = (byte) '5';
}
catch (Exception e)
{
; // "MessageDigest failure; " + e
}
return hex_digest;
}
/*
* Turn 16-byte stream into a human-readable 32-byte hex string
*/
private static void bytesToHex(byte[] bytes, byte[] hex, int offset)
{
final char lookup[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f' };
int i, c, j, pos = offset;
for (i = 0; i < 16; i++)
{
c = bytes[i] & 0xFF;
j = c >> 4;
hex[pos++] = (byte) lookup[j];
j = (c & 0xF);
hex[pos++] = (byte) lookup[j];
}
}
}
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