This abstract class defines the service-provider interface for KeyAgreement. A cryptographic provider must implement a concrete subclass of this class for each encryption algorithm it supports. Applications never need to use or subclass this class.

public abstract class KeyAgreementSpi {
// Public Constructors
     public KeyAgreementSpi( );  
// Protected Instance Methods
     protected abstract java.security.Key engineDoPhase(java.security.Key key, 
        boolean lastPhase) throws java.security.InvalidKeyException, 
        IllegalStateException;  
     protected abstract byte[ ] engineGenerateSecret( ) throws IllegalStateException;  
     protected abstract SecretKey engineGenerateSecret(String algorithm) 
        throws IllegalStateException, 
        java.security.NoSuchAlgorithmException, 
        java.security.InvalidKeyException;  
     protected abstract int engineGenerateSecret(byte[ ] sharedSecret, int offset) 
        throws IllegalStateException, ShortBufferException;  
     protected abstract void engineInit(java.security.Key key, 
        java.security.SecureRandom random) 
        throws java.security.InvalidKeyException;  
     protected abstract void engineInit(java.security.Key key, 
        java.security.spec.AlgorithmParameterSpec params, 
        java.security.SecureRandom random) 
        throws java.security.InvalidKeyException, 
        java.security.InvalidAlgorithmParameterException;  
}

Passed To

KeyAgreement.KeyAgreement( )