I have written javascript to for RSASHA256 but gettitng error crypto.js is not defined.

 function aaa(message,secret) {

     <script src=http://crypto-

      js.googlecode.com/svn/tags/3.0.2/build/rollups/hmac-sha256.js></script>;

     <script src=http://crypto-

      js.googlecode.com/svn/tags/3.0.2/build/components/enc-base64-min.js></script>;

     var hash = CryptoJS.HmacSHA256(Message, secret);

     var hashInBase64 = CryptoJS.enc.Base64.stringify(hash);

     document.write(hashInBase64);

}