code conversion from java to vb.net

Question

Please help with vb.net version of below method.

 

public static String ValidateTokenSourcePassReq(String scode, String requestID, String spwd)

{

String retVal = null;

try

{

String data = requestID + scode + spwd;

MessageDigest digest = MessageDigest.getInstance("SHA-512");

byte[] hashBytes = data.getBytes("UTF-8");

byte[] messageDigest = digest.digest(hashBytes);

StringBuffer sb = new StringBuffer();

for (int i = 0; i < messageDigest.length; i++)

{

String h = Integer.toHexString(0xFF & messageDigest[i]);

while(h.length() < 2)

h = "0" + h;

sb.append(h);

}

retVal = sb.toString();

}

catch(Exception ex)

{

LoggingUtil.logError(ex);

}

return retVal ;

}