I am writing a JavaScript Client Application that needs to communicate with Server. I tried to implement the API, but i stuck on one method and I need help.

Infect i don't know how to translate this from Java to JavaScript (I don't know where to find analog libraries written in javascript that are used in this method):

import java.security.SignatureException;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;



/**

* This class defines common routines for generating

* authentication signatures for AWS requests.

*/

public class Signature {

 private static final String HMAC_SHA1_ALGORITHM = HmacSHA1;





/**

* Computes RFC 2104-compliant HMAC signature.

* * @param data

* The data to be signed.

* @param key

* The signing key.

* @return

* The Base64-encoded RFC 2104-compliant HMAC signature.

* @throws

* java.security.SignatureException when signature generation fails

*/

public static String calculateRFC2104HMAC(String data, String key)

throws java.security.SignatureException

{

   String result;

   try {



     // get an hmac_sha1 key from the raw key bytes

    SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), HMAC_SHA1_ALGORITHM);



   // get an hmac_sha1 Mac instance and initialize with the signing key

   Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);

   mac.init(signingKey);



   // compute the hmac on input data bytes

   byte[] rawHmac = mac.doFinal(data.getBytes());



   // base64-encode the hmac

   result = Encoding.EncodeBase64(rawHmac);



   } catch (Exception e) {

     throw new SignatureException(Failed to generate HMAC :  + e.getMessage());

   }

  return result;

 }

}

This method is from AWS Documentations:
Java Sample Code for Calculating HMAC-SHA1 Signatures

I am asking if someone can give me some references (websites) where I can find solution or analog libraries, written in javascript.

I searched AWS Documentation and SDK for JavaScript and I couldn't find translation in JS.

Thanks very much in advance.