Java HMAC hmac(String hash, String data, String key)

Description

hmac

License

Apache License

Declaration

public static String hmac(String hash, String data, String key) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.UnsupportedEncodingException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;

public class Main {

    public static String hmac(String hash, String data, String key) {
        byte[] byteHMAC = null;
        try {//  w w  w.j a  v a2  s  . c  o  m
            Mac mac = Mac.getInstance("Hmac" + hash);
            SecretKeySpec spec = new SecretKeySpec(key.getBytes(), "Hmac" + hash);
            mac.init(spec);
            byteHMAC = mac.doFinal(data.getBytes("UTF-8"));
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException ignore) {
            ignore.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        if (byteHMAC != null) {
            try {
                String hexMac = bytes2hex(byteHMAC);
                return hexMac;
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
        return null;
    }

    public static String bytes2hex(byte[] bts) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        int j = bts.length;
        char str[] = new char[j * 2];
        int k = 0;
        for (int i = 0; i < j; i++) {
            byte byte0 = bts[i];
            str[k++] = hexDigits[byte0 >>> 4 & 0xf];
            str[k++] = hexDigits[byte0 & 0xf];
        }
        return new String(str);
    }
}

Related

1. hmac(byte key[], byte text[])
2. hmac(String msg, String keyString)
3. HMAC(String username, BigInteger nonce, String hashedPassword)
4. hmac_sha(String crypto, byte[] keyBytes, byte[] text)
5. hmac_sha(String crypto, byte[] keyBytes, byte[] text)