package com.taover.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public class UtilEncrypt {	
	
	public static String MD5Lower32(String sourceStr) {
        String result = "";
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            result = buf.toString();
        } catch (NoSuchAlgorithmException e) {
            System.out.println(e);
        }
        return result;
	}
	
	private static final String HMAC_SHA1_ALGORITHM = "HmacSHA1";
	/**
	 * hmac sha1
	 * @param src
	 * @param key
	 * @return
	 */
	public static byte[] hmacSha1(byte[] key, byte[] src) {
        try {
            SecretKeySpec signingKey = new SecretKeySpec(key, HMAC_SHA1_ALGORITHM);
            Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
            mac.init(signingKey);
            return mac.doFinal(src);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
	
	public static void main(String[] args) {
		System.out.println(MD5Lower32("Lexi@1799")+"6591");
		System.out.println(MD5Lower32("adf8d8f44072dfae10ca8d11d060bf406591"));
	}
}