decapsulate
Decapsulates a KyberCipherText and recovers the Shared Secret Key.
This method is the ML-KEM.Decaps() specified in NIST FIPS 203.
Equivalent method with KyberCipherText.decapsulate.
Return
ByteArray - The generated Shared Secret Key, which is the same one generated by the sender.
Parameters
cipher
received KyberCipherText.