Use EncryptorSource::CreateEncryptor for encryptor creation. EncryptorSource no longer owns the created encryptor. Change-Id: I34d1f32262b7692bcb347d3b084fd06cbae7850f
Use AES CBC signing for now. Rsa signing is not implemented yet. Change-Id: Ife52ac098e9a82d4e40bbe0c0156f435a67c1aac