1 package org.bouncycastle.crypto; 2 3 import java.math.BigInteger; 4 5 /** 6 * The basic interface that basic Diffie-Hellman implementations 7 * conforms to. 8 */ 9 public interface BasicAgreement 10 { 11 /** 12 * initialise the agreement engine. 13 */ init(CipherParameters param)14 void init(CipherParameters param); 15 16 /** 17 * return the field size for the agreement algorithm in bytes. 18 */ getFieldSize()19 int getFieldSize(); 20 21 /** 22 * given a public key from a given party calculate the next 23 * message in the agreement sequence. 24 */ calculateAgreement(CipherParameters pubKey)25 BigInteger calculateAgreement(CipherParameters pubKey); 26 } 27