Top Description Fields Constructors Methods
org.bouncycastle.crypto.agreement

public Class ECDHCBasicAgreement

extends Object
implements BasicAgreement
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.BasicAgreement
Imports
java.math.BigInteger, org.bouncycastle.crypto.BasicAgreement, .CipherParameters, .CryptoServicesRegistrar, org.bouncycastle.crypto.params.ECDomainParameters, .ECPrivateKeyParameters, .ECPublicKeyParameters, org.bouncycastle.math.ec.ECAlgorithms, .ECPoint
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!).

Field Summary

Modifier and TypeField and Description
pack-priv ECPrivateKeyParameters
key

Constructor Summary

AccessConstructor and Description
public
ECDHCBasicAgreement()

Method Summary

Modifier and TypeMethod and Description
public BigInteger
calculateAgreement(CipherParameters pubKey)

Implements org.bouncycastle.crypto.BasicAgreement.calculateAgreement.

given a public key from a given party calculate the next message in the agreement sequence.

public int
getFieldSize()

Implements org.bouncycastle.crypto.BasicAgreement.getFieldSize.

return the field size for the agreement algorithm in bytes.

public void
init(CipherParameters key)

Implements org.bouncycastle.crypto.BasicAgreement.init.

initialise the agreement engine.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

keyback to summary
pack-priv ECPrivateKeyParameters key

Constructor Detail

ECDHCBasicAgreementback to summary
public ECDHCBasicAgreement()

Method Detail

calculateAgreementback to summary
public BigInteger calculateAgreement(CipherParameters pubKey)

Implements org.bouncycastle.crypto.BasicAgreement.calculateAgreement.

Doc from org.bouncycastle.crypto.BasicAgreement.calculateAgreement.

given a public key from a given party calculate the next message in the agreement sequence.

getFieldSizeback to summary
public int getFieldSize()

Implements org.bouncycastle.crypto.BasicAgreement.getFieldSize.

Doc from org.bouncycastle.crypto.BasicAgreement.getFieldSize.

return the field size for the agreement algorithm in bytes.

initback to summary
public void init(CipherParameters key)

Implements org.bouncycastle.crypto.BasicAgreement.init.

Doc from org.bouncycastle.crypto.BasicAgreement.init.

initialise the agreement engine.