* The 128 bit MD5 hash is converted into a 32 character long String. * Each character of the String is the hexadecimal representation of 4 bits * of the digest. * * @author Remy Maucherat * @version $Revision: 515 $ $Date: 2008-03-17 22:02:23 +0100 (Mon, 17 Mar 2008) $ */ public final class MD5Encoder { // ----------------------------------------------------- Instance Variables private static final char[] hexadecimal = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; // --------------------------------------------------------- Public Methods /** * Encodes the 128 bit (16 bytes) MD5 into a 32 character String. * * @param binaryData Array containing the digest * @return Encoded MD5, or null if encoding failed */ public String encode( byte[] binaryData ) { if (binaryData.length != 16) return null; char[] buffer = new char[32]; for (int i=0; i<16; i++) { int low = (int) (binaryData[i] & 0x0f); int high = (int) ((binaryData[i] & 0xf0) >> 4); buffer[i*2] = hexadecimal[high]; buffer[i*2 + 1] = hexadecimal[low]; } return new String(buffer); } }