Class SM9SigMasterPrivateKeyParameters

java.lang.Object

org.bouncycastle.crypto.params.AsymmetricKeyParameter

org.bouncycastle.crypto.params.SM9SigMasterPrivateKeyParameters

All Implemented Interfaces:

Destroyable, CipherParameters, SM9SigUserKeyParametersGenerator

public class SM9SigMasterPrivateKeyParameters
extends AsymmetricKeyParameter
implements Destroyable, SM9SigUserKeyParametersGenerator

SM9 signature master private key ks (GM/T 0044.2-2016). Held by the Key Generation Center (KGC); derives the master public key P_pub-s = [ks]P2 and users' signature private keys from their identities.

Field Summary

Fields

Modifier and Type	Field	Description
static final byte	HID	The signature private-key generation function identifier hid, fixed to 0x01 for the SM9 signature algorithm (GM/T 0044.2-2016, Annex A).

Constructor Summary

Constructors

Constructor	Description
SM9SigMasterPrivateKeyParameters(BigInteger ks)

Method Summary

Modifier and Type	Method	Description
void	destroy()	Destroy this object, dropping its reference to the master secret ks.
static SM9SigMasterPrivateKeyParameters	fromEncoded(byte[] enc)
SM9SigPrivateKeyParameters	generateUserKey(byte[] identity)	Derive the signature private key for the user identified by identity (GM/T 0044.2-2016, 5.3): t1 = H1(identity||hid, N) + ks; if t1 = 0 the master key must be regenerated; otherwise t2 = ks*t1^-1 and ds = [t2]P1.
byte[]	getEncoded()	The master private key ks as a 32-byte big-endian scalar.
SM9SigMasterPublicKeyParameters	getPublicKeyParameters()
boolean	isDestroyed()

Methods inherited from class AsymmetricKeyParameter

isPrivate

Methods inherited from class Object

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

Field Details

HID

public static final byte HID

The signature private-key generation function identifier hid, fixed to 0x01 for the SM9 signature algorithm (GM/T 0044.2-2016, Annex A).

See Also:

• Constant Field Values

Constructor Details

SM9SigMasterPrivateKeyParameters

public SM9SigMasterPrivateKeyParameters(BigInteger ks)

Method Details

getPublicKeyParameters

public SM9SigMasterPublicKeyParameters getPublicKeyParameters()

getEncoded

public byte[] getEncoded()

The master private key ks as a 32-byte big-endian scalar.

fromEncoded

public static SM9SigMasterPrivateKeyParameters fromEncoded(byte[] enc)

generateUserKey

public SM9SigPrivateKeyParameters generateUserKey(byte[] identity)

Derive the signature private key for the user identified by identity (GM/T 0044.2-2016, 5.3): t1 = H1(identity||hid, N) + ks; if t1 = 0 the master key must be regenerated; otherwise t2 = ks*t1^-1 and ds = [t2]P1.

Specified by:

generateUserKey in interface SM9SigUserKeyParametersGenerator

Parameters:

identity - the user's identity.

Returns:

the user's signature private key.

destroy

public void destroy()

Destroy this object, dropping its reference to the master secret ks.

As BigInteger is immutable the secret value cannot be zeroized in place; destruction drops the reference and marks the key destroyed, after which getEncoded() and generateUserKey(byte[]) throw IllegalStateException. The public key parameters remain available.

Specified by:

destroy in interface Destroyable

isDestroyed

public boolean isDestroyed()

Specified by:

isDestroyed in interface Destroyable