Main.java Source code

Introduction

Here is the source code for Main.java

Source

//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 {
    private static final char[] HEX_CHARS = "0123456789abcdef".toCharArray();

    public static String hmacSha256Encode(String key, String data)
            throws NoSuchAlgorithmException, InvalidKeyException, UnsupportedEncodingException {
        Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
        SecretKeySpec secret_key = new SecretKeySpec(key.getBytes("utf-8"), "HmacSHA256");
        sha256_HMAC.init(secret_key);
        return asHex(sha256_HMAC.doFinal(data.getBytes("utf-8")));
    }

    private static String asHex(byte[] buf) {
        char[] chars = new char[2 * buf.length];
        for (int i = 0; i < buf.length; ++i) {
            chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4];
            chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F];
        }
        return new String(chars);
    }
}