MD5 String : Hash Code « Development Class « Java






  1. Java
  2. Development Class
  3. Hash Code

MD5 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; publicclass Strings { privatestaticfinal MessageDigest MESSAGE_DIGEST; publicstaticfinal String[] EMPTY_ARRAY = new String[0]; static { MessageDigest md; try { md = MessageDigest.getInstance("MD5"); } catch(NoSuchAlgorithmException err) { thrownew IllegalStateException(); } MESSAGE_DIGEST = md; } privatestaticfinal String HEX_CHARS = "0123456789ABCDEF"; publicstatic String getMD5(String source) { byte[] bytes; try { bytes = source.getBytes("UTF-8"); } catch(java.io.UnsupportedEncodingException ue) { thrownew IllegalStateException(ue); } byte[] result; synchronized(MESSAGE_DIGEST) { MESSAGE_DIGEST.update(bytes); result = MESSAGE_DIGEST.digest(); } char[] resChars = newchar[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); } returnnew String(resChars); } publicstatic String getHash32(String source) throws UnsupportedEncodingException { String md5 = getMD5(source); return md5.substring(0, 8); } publicstatic String getHash64(String source) throws UnsupportedEncodingException { String md5 = getMD5(source); return md5.substring(0, 16); } }








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