Flex 4.0 HMAC.hash binary data

[richardchristie]

I am trying to replicate a function I have in php, in my flex code:

If PHP:

$mac = base64_encode(hash_hmac('sha256', $message, $secret, true));

If the last element is a true the hash_hmac is outputted as raw binary data, if it is false outputs lowercase hexits.

I have the following code written in Flex:

encryptedString = HMAC.hash(tempString,message,algorithm); 

In flex I am using the following imports:

     import com.adobe.crypto.HMAC;

     import com.adobe.crypto.SHA256;

However, it outputs it as lowercase hexit. I can not find out how to convert the Flex output to binary data to match the PHP.

Does anyone know?

[Yuriy_Belenko]

I've solved this problem by adding self-made function in HMAC Class:

/**
* Performs the HMAC hash algorithm using string.
* This function equals php "hash_hmac" function when "raw_output" parameter is set to true.
* @param secret The secret key
* @param message The message to hash
* @param algorithm Hash object to use
* @return raw binary data as ByteArray
*/
public static function getRawHash(secret:String, message:String, algorithm:Object = null):ByteArray {
          var hexHash:String = hash(secret, message, algorithm); 
          var hashBinary:ByteArray = new ByteArray();
          for (var i:uint = 0; i < hexHash.length; i += 2) {
               var c:String = hexHash.charAt(i) + hexHash.charAt(i + 1);
               hashBinary.writeByte(parseInt(c, 16));
          }
          return hashBinary; 
}

After, if you neen "base64" string you can do something like that:

private function createHashForSign(secretKey:String, message:String):String {
          var hash:ByteArray = HMAC.getRawHash(secretKey, message, SHA1); 
          var baseEncoder:Base64Encoder = new Base64Encoder();
          baseEncoder.encodeBytes(hash, 0, hash.length); 
          return baseEncoder.toString(); 
}