Java MD5 String md5(String txt)

Description

License

Open Source License

Parameter

Parameter	Description
txt	a parameter

Return

MD5 hash of txt (32 hex digits). MD5 has known security flaws. But it is fast & good for non-security uses.<br> See http://www.javamex.com/tutorials/cryptography/ hash_functions_algorithms.shtml

Declaration

public static String md5(String txt)

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.UnsupportedEncodingException;

public class Main {
    public static final String ENCODING_UTF8 = "UTF8";

    /**/*from  www. ja va 2  s .  c  om*/
     * @param txt
     * @return MD5 hash of txt (32 hex digits). MD5 has known security flaws. But it is fast &
     *         good for non-security uses.<br>
     * 
     *         See http://www.javamex.com/tutorials/cryptography/
     *         hash_functions_algorithms.shtml
     * @see #sha1(String)
     */
    public static String md5(String txt) {
        return hash("MD5", txt);
    }

    /**
     * 
     * @param hashAlgorithm e.g. "MD5"
     * @param txt
     * @return
     */
    public static String hash(String hashAlgorithm, String txt) {
        if ("SHA256".equals(hashAlgorithm))
            hashAlgorithm = "SHA-256";
        try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance(hashAlgorithm);
            StringBuilder result = new StringBuilder();
            try {
                for (byte b : md.digest(txt.getBytes(ENCODING_UTF8))) {
                    result.append(Integer.toHexString((b & 0xf0) >>> 4));
                    result.append(Integer.toHexString(b & 0x0f));
                }
            } catch (UnsupportedEncodingException e) {
                for (byte b : md.digest(txt.getBytes())) {
                    result.append(Integer.toHexString((b & 0xf0) >>> 4));
                    result.append(Integer.toHexString(b & 0x0f));
                }
            }
            return result.toString();
        } catch (java.security.NoSuchAlgorithmException ex) {
            throw new RuntimeException(ex);
        }
    }
}