Bouncy Castle Cryptography 1.11 API Specification: Class ECDHCBasicAgreement
Bouncy Castle Cryptography 1.11

Class ECDHCBasicAgreement

All Implemented Interfaces:

public class ECDHCBasicAgreement
extends java.lang.Object
implements BasicAgreement

P1363 7.2.2 ECSVDP-DHC ECSVDP-DHC is Elliptic Curve Secret Value Derivation Primitive, Diffie-Hellman version with cofactor multiplication. It is based on the work of [DH76], [Mil86], [Kob87], [LMQ98] and [Kal98a]. This primitive derives a shared secret value from one party's private key and another party's public key, where both have the same set of EC domain parameters. If two parties correctly execute this primitive, they will produce the same output. This primitive can be invoked by a scheme to derive a shared secret key; specifically, it may be used with the schemes ECKAS-DH1 and DL/ECKAS-DH2. It does not assume the validity of the input public key (see also Section 7.2.1).

Note: As stated P1363 compatability mode with ECDH can be preset, and in this case the implementation doesn't have a ECDH compatability mode (if you want that just use ECDHBasicAgreement and note they both implement BasicAgreement!).

Constructor Summary
Method Summary
 java.math.BigInteger calculateAgreement(CipherParameters pubKey)
          given a public key from a given party calculate the next message in the agreement sequence.
 void init(CipherParameters key)
          initialise the agreement engine.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail


public ECDHCBasicAgreement()
Method Detail


public void init(CipherParameters key)
Description copied from interface: BasicAgreement
initialise the agreement engine.
Specified by:
init in interface BasicAgreement


public java.math.BigInteger calculateAgreement(CipherParameters pubKey)
Description copied from interface: BasicAgreement
given a public key from a given party calculate the next message in the agreement sequence.
Specified by:
calculateAgreement in interface BasicAgreement

Bouncy Castle Cryptography 1.11