Package org.bouncycastle.crypto.params

Class ECCSIKeyGenerationParameters

java.lang.Object

org.bouncycastle.crypto.KeyGenerationParameters

org.bouncycastle.crypto.params.ECCSIKeyGenerationParameters

public class ECCSIKeyGenerationParameters
extends KeyGenerationParameters

Parameters for ECCSI key generation.

This class encapsulates the parameters required for ECCSI (Elliptic Curve Certificateless Signatures for Identity-based encryption) key generation. It holds the elliptic curve domain parameters and computes the key pair components used in ECCSI.

The secret component ksak is generated randomly and reduced modulo q, while kpak is derived from ksak by multiplying the generator point.

Constructor Summary

Constructors

Constructor	Description
ECCSIKeyGenerationParameters(SecureRandom random, X9ECParameters params, Digest digest, byte[] id)	Constructs an instance of ECCSIKeyGenerationParameters with the specified source of randomness, elliptic curve parameters, digest algorithm, and identifier.

Method Summary

Modifier and Type	Method	Description
BigInteger	computeSSK(BigInteger hs_v)	Computes the session secret key (SSK) by adding the provided value to the secret key component and reducing modulo the curve order.
Digest	getDigest()	Returns the digest algorithm used for key generation.
ECPoint	getG()	Returns the generator (base point) of the elliptic curve.
byte[]	getId()	Returns a copy of the identifier used in these parameters.
ECPoint	getKPAK()	Returns the public key component (kpak) corresponding to the secret key.
int	getN()	Returns the bit length used in key generation.
BigInteger	getQ()	Returns the order of the elliptic curve.

Methods inherited from class org.bouncycastle.crypto.KeyGenerationParameters

getRandom, getStrength

Methods inherited from class java.lang.Object

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

Constructor Details

ECCSIKeyGenerationParameters

public ECCSIKeyGenerationParameters(SecureRandom random,
 X9ECParameters params,
 Digest digest,
 byte[] id)

Constructs an instance of ECCSIKeyGenerationParameters with the specified source of randomness, elliptic curve parameters, digest algorithm, and identifier.

Parameters:

random - the source of randomness.

params - the elliptic curve parameters (in X9.62 format) providing the curve, order, and generator.

digest - the digest algorithm to be used.

id - the identifier associated with the key generation (e.g. a user or device ID).

Method Details

getId

public byte[] getId()

Returns a copy of the identifier used in these parameters.

Returns:

a byte array containing the identifier.

getKPAK

public ECPoint getKPAK()

Returns the public key component (kpak) corresponding to the secret key.

Returns:

the public key point.

computeSSK

public BigInteger computeSSK(BigInteger hs_v)

Computes the session secret key (SSK) by adding the provided value to the secret key component and reducing modulo the curve order.

Parameters:

hs_v - a BigInteger value (typically derived from a hash) to be added to the secret.

Returns:

the computed session secret key.

getQ

public BigInteger getQ()

Returns the order of the elliptic curve.

Returns:

the curve order.

getG

public ECPoint getG()

Returns the generator (base point) of the elliptic curve.

Returns:

the generator point.

getDigest

public Digest getDigest()

Returns the digest algorithm used for key generation.

Returns:

the digest.

getN

public int getN()

Returns the bit length used in key generation.

Returns:

the bit length.