package com.test;
 
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
 
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
 
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.binary.Base64;
 
public class SHA256 {
       
        public static void main(String[] args) throws UnsupportedEncodingException,
        EncoderException, DecoderException, MalformedURLException,
        URISyntaxException {
// encryptString();
                String strKey = "ItGjgFQB80c5WN5VT1Y9ZLZIRcR48JSvmee0e4Yu3ig%3D";
                String encStr = encodeString(strKey,"xxxx","yyyy");
                //System.out.println("encodeString: "+encStr);
                String url = "https://xxx.yyy.zzz.com/abc/def/AuthenticationToken?cred="
                                + encStr + "&key=" + strKey;
 
                //if (encStr != null)
                        //System.out.println("final url:   \t" + url);
}
 
        public static String encodeString(String key, String username, String password) throws UnsupportedEncodingException,
        EncoderException, DecoderException, MalformedURLException,
        URISyntaxException {
 
String userCred = username + (char) 30 + password;
String urlDecodedKey = URLDecoder.decode(key, "UTF-8");
System.out.println("decodedkey: "+urlDecodedKey);
byte[] simple1 = Base64.decodeBase64(urlDecodedKey);
// sha256 hash for url decoded key
byte[] sha256bytes = org.apache.commons.codec.digest.DigestUtils
                .sha256(simple1);
byte[] iv = new byte[16];
 
// remove every other char
for (int i = 0; i < 16; i++) {
        iv[i] = sha256bytes[i * 2];
}
// encrypt and base64encode
 
String encryptedString = encrypt(simple1, iv, userCred);
// uriencode the base 64 string
System.out.println("cred: "+encryptedString);
 
String Decodedurl = "https://xxx.yyy.zzz.com/abc/def/AuthenticationToken?cred="
                + encryptedString + "&key=" + urlDecodedKey;
//System.out.println("Decoded url "+Decodedurl);
encryptedString = URLEncoder.encode(encryptedString, "UTF-8");
return encryptedString;
 
}
 
public static String sha256(String base) {
try {
        MessageDigest digest = MessageDigest.getInstance("SHA-256");
        byte[] hash = digest.digest(base.getBytes("UTF-8"));
        StringBuffer hexString = new StringBuffer();
        for (int i = 0; i < hash.length; i++) {
                String hex = Integer.toHexString(0xff & hash[i]);
                if (hex.length() == 1)
                        hexString.append('0');
                hexString.append(hex);
        }
        return hexString.toString();
} catch (Exception ex) {
        throw new RuntimeException(ex);
}
}
 
public static String encrypt(byte[] key, byte[] initVector, String value) {
try {
 
        // byte [] ivTemp = initVector.getBytes("UTF-8");
 
        IvParameterSpec iv = new IvParameterSpec(initVector);
        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(value.getBytes("UTF-8"));
        // Arrays.toString(encrypted);
        return Base64.encodeBase64String(encrypted);
        // return new String(encrypted);
} catch (Exception ex) {
        ex.printStackTrace();
}
 
return null;
 
}
 
}