org.bouncycastle.pqc.crypto.hqc

Class HQCPrivateKeyParameters

java.lang.Object

org.bouncycastle.crypto.params.AsymmetricKeyParameter

org.bouncycastle.pqc.crypto.hqc.HQCKeyParameters

org.bouncycastle.pqc.crypto.hqc.HQCPrivateKeyParameters

All Implemented Interfaces:

CipherParameters

public class HQCPrivateKeyParameters
extends HQCKeyParameters

An HQC decapsulation key. Its encoding is dkKEM = seedKEM, the 32-byte seed from which the HQC specification of 2026-10-12 derives the whole key pair (Section 3.7, Table 9); the expanded form decapsulation works on - ekPKE, seedPKE.dk and sigma - is derived from it on first use and kept, the caching the specification allows to offset the cost of re-deriving it on every decapsulation.

Constructor Summary

Constructors

Constructor and Description
HQCPrivateKeyParameters(HQCParameters params, byte[] sk)

Method Summary

Modifier and Type	Method and Description
byte[]	getEncoded()
byte[]	getPrivateKey()
HQCPublicKeyParameters	getPublicKeyParameters() Return the encapsulation key this decapsulation key pairs with, derived from the seed.

Methods inherited from class org.bouncycastle.pqc.crypto.hqc.HQCKeyParameters

getParameters

Methods inherited from class org.bouncycastle.crypto.params.AsymmetricKeyParameter

isPrivate

Methods inherited from class java.lang.Object

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

Constructor Detail

HQCPrivateKeyParameters

public HQCPrivateKeyParameters(HQCParameters params,
                               byte[] sk)

Parameters:

params - the parameter set.

sk - the 32-byte seedKEM.

Method Detail

getPublicKeyParameters

public HQCPublicKeyParameters getPublicKeyParameters()

Return the encapsulation key this decapsulation key pairs with, derived from the seed.

Returns:

the matching public key parameters.

getPrivateKey

public byte[] getPrivateKey()

Returns:

a copy of the 32-byte seedKEM.

getEncoded

public byte[] getEncoded()

Returns:

the key's encoding, the 32-byte seedKEM.