Java MD5 String md5(String input)

Description

md

Declaration

public static String md5(String input) 

Method Source Code

//package com.java2s;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    private final static char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
            'E', 'F' };

    public static String md5(String input) {
        return code(input, 32);
    }//  www . j  a  v a  2  s.  co m

    private static String code(String input, int bit) {
        MessageDigest md = null;
        String encodeStr = null;
        try {
            md = MessageDigest.getInstance(System.getProperty("MD5.algorithm", "MD5"));
            if (bit == 16) {
                encodeStr = bytesToHex(md.digest(input.getBytes("utf-8"))).substring(8, 24);
            } else {
                encodeStr = bytesToHex(md.digest(input.getBytes("utf-8")));
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encodeStr;
    }

    private static String bytesToHex(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        int t;
        for (int i = 0; i < 16; i++) {
            t = bytes[i];
            if (t < 0) {
                t += 256;
            }
            sb.append(hexDigits[(t >>> 4)]);
            sb.append(hexDigits[(t % 16)]);
        }
        return sb.toString();
    }
}

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