Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

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

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

    public static String encryptHmacMD5ToString(String data, String key) {
        return encryptHmacMD5ToString(data.getBytes(), key.getBytes());
    }

    public static String encryptHmacMD5ToString(byte[] data, byte[] key) {
        return bytes2HexString(encryptHmacMD5(data, key));
    }

    private static String bytes2HexString(byte[] bytes) {
        if (bytes == null)
            return null;
        int len = bytes.length;
        if (len <= 0)
            return null;
        char[] ret = new char[len << 1];
        for (int i = 0, j = 0; i < len; i++) {
            ret[j++] = hexDigits[bytes[i] >>> 4 & 0x0f];
            ret[j++] = hexDigits[bytes[i] & 0x0f];
        }
        return new String(ret);
    }

    public static byte[] encryptHmacMD5(byte[] data, byte[] key) {
        return hmacTemplate(data, key, "HmacMD5");
    }

    private static byte[] hmacTemplate(byte[] data, byte[] key, String algorithm) {
        if (data == null || data.length == 0 || key == null || key.length == 0)
            return null;
        try {
            SecretKeySpec secretKey = new SecretKeySpec(key, algorithm);
            Mac mac = Mac.getInstance(algorithm);
            mac.init(secretKey);
            return mac.doFinal(data);
        } catch (InvalidKeyException | NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}