C# Applepay ECDSA decrypter
This code basically trying to convert JAVA code, which we got from Apple
Attaching actual JAVA code in the same repository in seperate folder (JavaCodeFromApple)
Actually getting error at the last line of the decrypt.
Error Details: http://stackoverflow.com/questions/39822191/c-sharp-aes-decryption-mac-check-in-gcm-failed