org.postgresql.util.MD5Digest Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of postgresql Show documentation
Show all versions of postgresql Show documentation
PostgreSQL JDBC Driver JDBC4
/*-------------------------------------------------------------------------
*
* Copyright (c) 2003-2014, PostgreSQL Global Development Group
*
*
*-------------------------------------------------------------------------
*/
package org.postgresql.util;
/**
* MD5-based utility function to obfuscate passwords before network
* transmission.
*
* @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(byte user[], byte password[], byte salt[])
{
MessageDigest md;
byte[] temp_digest, pass_digest;
byte[] hex_digest = new byte[35];
try
{
md = MessageDigest.getInstance("MD5");
md.update(password);
md.update(user);
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];
}
}
}