Hash 32 String
/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: lobochief@users.sourceforge.net
*/
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
public class Strings
{
private static final MessageDigest MESSAGE_DIGEST;
public static final String[] EMPTY_ARRAY = new String[0];
static {
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch(NoSuchAlgorithmException err) {
throw new IllegalStateException();
}
MESSAGE_DIGEST = md;
}
private static final String HEX_CHARS = "0123456789ABCDEF";
public static String getMD5(String source) {
byte[] bytes;
try {
bytes = source.getBytes("UTF-8");
} catch(java.io.UnsupportedEncodingException ue) {
throw new IllegalStateException(ue);
}
byte[] result;
synchronized(MESSAGE_DIGEST) {
MESSAGE_DIGEST.update(bytes);
result = MESSAGE_DIGEST.digest();
}
char[] resChars = new char[32];
int len = result.length;
for(int i = 0; i < len; i++) {
byte b = result[i];
int lo4 = b & 0x0F;
int hi4 = (b & 0xF0) >> 4;
resChars[i*2] = HEX_CHARS.charAt(hi4);
resChars[i*2 + 1] = HEX_CHARS.charAt(lo4);
}
return new String(resChars);
}
public static String getHash32(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 8);
}
public static String getHash64(String source) throws UnsupportedEncodingException {
String md5 = getMD5(source);
return md5.substring(0, 16);
}
}
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