RSA OAEP Label

[letisoft]

Hello,

I have noticed two things:

1. static Future encryptOAEP(String message, String label, Hash hash, String publicKey)
   lable must be optional as it is changing the result and becuase in the undelying EncryptOaeprequestObjectBuilder it is optional. I have modified it as otherwise it is not working if no lable in use
2. static Future encryptOAEP(String message, String label, Hash hash, String publicKey)
   can we have the public key as binary instead of parsing it on every operation?

Best regards:
V