Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

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 computeHmacSha1(String value, String keyString) throws InvalidKeyException,
            IllegalStateException, UnsupportedEncodingException, NoSuchAlgorithmException {
        SecretKeySpec key = new SecretKeySpec((keyString).getBytes("UTF-8"), "HmacSHA1");
        Mac mac = Mac.getInstance("HmacSHA1");
        mac.init(key);

        byte[] bytes = mac.doFinal(value.getBytes("UTF-8"));

        return convToHex(bytes);
    }

    private static String convToHex(byte[] data) {
        StringBuilder buf = new StringBuilder();
        for (int i = 0; i < data.length; i++) {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do {
                if ((0 <= halfbyte) && (halfbyte <= 9))
                    buf.append((char) ('0' + halfbyte));
                else
                    buf.append((char) ('a' + (halfbyte - 10)));
                halfbyte = data[i] & 0x0F;
            } while (two_halfs++ < 1);
        }
        return buf.toString();
    }
}