org.spongycastle.crypto.agreement

Class ECDHCBasicAgreement

java.lang.Object

org.spongycastle.crypto.agreement.ECDHCBasicAgreement

All Implemented Interfaces:

BasicAgreement

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

Constructor Summary

Constructors

Constructor and Description
ECDHCBasicAgreement()

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger	calculateAgreement(CipherParameters pubKey) given a public key from a given party calculate the next message in the agreement sequence.
int	getFieldSize() return the field size for the agreement algorithm in bytes.
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

ECDHCBasicAgreement

public ECDHCBasicAgreement()

Method Detail

init

public void init(CipherParameters key)

Description copied from interface: BasicAgreement

initialise the agreement engine.

Specified by:

init in interface BasicAgreement

getFieldSize

public int getFieldSize()

Description copied from interface: BasicAgreement

return the field size for the agreement algorithm in bytes.

Specified by:

getFieldSize in interface BasicAgreement

calculateAgreement

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