Class EcdhKeyGenBuilder

java.lang.Object

zeroecho.core.alg.ecdh.EcdhKeyGenBuilder

All Implemented Interfaces:

AsymmetricKeyPairGenerator<EcdhCurveSpec>

public final class EcdhKeyGenBuilder
extends Object
implements AsymmetricKeyPairGenerator<EcdhCurveSpec>

ECDH Key Pair Generator

Implementation of AsymmetricKeyPairGenerator for elliptic curve Diffie-Hellman (ECDH) key pairs.

This builder generates fresh EC key pairs suitable for ECDH key agreement. It accepts an EcdhCurveSpec that defines the named curve to use (e.g., P-256, P-384, P-521).

Usage

// Generate a key pair on P-256
KeyPair kp = new EcdhKeyGenBuilder().generateKeyPair(EcdhCurveSpec.P256);

Import of existing keys is not supported by this builder. Instead, use EcdsaPublicKeyBuilder and EcdsaPrivateKeyBuilder together with EcdsaPublicKeySpec or EcdsaPrivateKeySpec when importing encoded elliptic curve keys.

Since:

1.0

Constructor Summary

Constructors

Constructor	Description
EcdhKeyGenBuilder()	Creates a stateless ECDH key-pair generator.

Method Summary

Modifier and Type	Method	Description
KeyPair	generateKeyPair(EcdhCurveSpec spec)	Generates a new elliptic curve key pair for use in ECDH key agreement.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

EcdhKeyGenBuilder

public EcdhKeyGenBuilder()

Creates a stateless ECDH key-pair generator.

Method Details

generateKeyPair

public KeyPair generateKeyPair(EcdhCurveSpec spec)
                        throws GeneralSecurityException

Generates a new elliptic curve key pair for use in ECDH key agreement.

The curve is determined from the provided EcdhCurveSpec. Internally, a standard JCA KeyPairGenerator for "EC" is initialized with the corresponding ECGenParameterSpec.

Specified by:

generateKeyPair in interface AsymmetricKeyPairGenerator<EcdhCurveSpec>

Parameters:

spec - curve specification selecting the named curve

Returns:

a freshly generated KeyPair suitable for ECDH

Throws:

GeneralSecurityException - if the curve is not supported by the underlying JCA provider or if key generation fails