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ECDHBasicAgreement.javaAPI DocAzureus 3.0.3.41508Mon Mar 20 04:56:46 GMT 2006org.bouncycastle.crypto.agreement

ECDHBasicAgreement

public class ECDHBasicAgreement extends Object implements org.bouncycastle.crypto.BasicAgreement
P1363 7.2.1 ECSVDP-DH ECSVDP-DH is Elliptic Curve Secret Value Derivation Primitive, Diffie-Hellman version. It is based on the work of [DH76], [Mil86], and [Kob87]. 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 assumes that the input keys are valid (see also Section 7.2.2).

Fields Summary
private org.bouncycastle.crypto.params.ECPrivateKeyParameters
key
Constructors Summary
Methods Summary
public java.math.BigIntegercalculateAgreement(org.bouncycastle.crypto.CipherParameters pubKey)

        ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey;
		ECPoint P = pub.getQ().multiply(key.getD());

		// if ( p.isInfinity() ) throw new RuntimeException("d*Q == infinity");

		return P.getX().toBigInteger();
public voidinit(org.bouncycastle.crypto.CipherParameters key)

		this.key = (ECPrivateKeyParameters)key;