Class LMSPrivateKeyParameters

java.lang.Object

org.bouncycastle.crypto.params.AsymmetricKeyParameter

org.bouncycastle.crypto.params.LMSKeyParameters

org.bouncycastle.crypto.params.LMSPrivateKeyParameters

All Implemented Interfaces:

Destroyable, CipherParameters, LMSContextBasedSigner, Encodable

public class LMSPrivateKeyParameters
extends LMSKeyParameters
implements LMSContextBasedSigner, Destroyable

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LMSPrivateKeyParameters(LMSigParameters lmsParameter, LMOtsParameters otsParameters, int maxQ)	A key with no position, identifier or seed of its own - the placeholder an HSS hierarchy is built with for the levels below the root, each of which resetKeyToIndex replaces from the level above before the key is used.
	LMSPrivateKeyParameters(LMSigParameters lmsParameter, LMOtsParameters otsParameters, int q, byte[] I, int maxQ, byte[] masterSecret)

Method Summary

Modifier and Type	Method	Description
void	destroy()	Destroy this key, zeroizing the master secret it holds.
boolean	equals(Object o)
LMSPrivateKeyParameters	extractKeyShard(int usageCount)	Return a key that can be used usageCount times.
LMSContext	generateLMSContext()
byte[]	generateSignature(LMSContext context)
byte[]	getEncoded()	Return a byte array representing the implementing object.
byte[]	getI()
int	getIndex()	Return the key index (the q value).
int	getIndexLimit()
static LMSPrivateKeyParameters	getInstance(byte[] privEnc, byte[] pubEnc)
static LMSPrivateKeyParameters	getInstance(Object src)
byte[]	getMasterSecret()
LMOtsParameters	getOtsParameters()
LMSPublicKeyParameters	getPublicKey()
LMSigParameters	getSigParameters()
long	getUsagesRemaining()
int	hashCode()
boolean	isDestroyed()

Methods inherited from class AsymmetricKeyParameter

isPrivate

Methods inherited from class Object

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

Constructor Details

LMSPrivateKeyParameters

public LMSPrivateKeyParameters(LMSigParameters lmsParameter,
 LMOtsParameters otsParameters,
 int q,
 byte[] I,
 int maxQ,
 byte[] masterSecret)

LMSPrivateKeyParameters

protected LMSPrivateKeyParameters(LMSigParameters lmsParameter,
 LMOtsParameters otsParameters,
 int maxQ)

A key with no position, identifier or seed of its own - the placeholder an HSS hierarchy is built with for the levels below the root, each of which resetKeyToIndex replaces from the level above before the key is used. The sentinel values are deliberately ones the public constructor refuses, so a placeholder can never be mistaken for a key that was merely built carelessly; a subclass using this must not present the result as a usable key.

Method Details

getInstance

public static LMSPrivateKeyParameters getInstance(byte[] privEnc,
 byte[] pubEnc)
                                           throws IOException

Throws:

IOException

getInstance

public static LMSPrivateKeyParameters getInstance(Object src)
                                           throws IOException

Throws:

IOException

getIndex

public int getIndex()

Return the key index (the q value).

Returns:

private key index number.

generateLMSContext

public LMSContext generateLMSContext()

Specified by:

generateLMSContext in interface LMSContextBasedSigner

generateSignature

public byte[] generateSignature(LMSContext context)

Specified by:

generateSignature in interface LMSContextBasedSigner

extractKeyShard

public LMSPrivateKeyParameters extractKeyShard(int usageCount)

Return a key that can be used usageCount times.

Note: this will use the range [index...index + usageCount) for the current key.

Parameters:

usageCount - the number of usages the key should have.

Returns:

a key based on the current key that can be used usageCount times.

getSigParameters

public LMSigParameters getSigParameters()

getOtsParameters

public LMOtsParameters getOtsParameters()

getI

public byte[] getI()

getMasterSecret

public byte[] getMasterSecret()

destroy

public void destroy()

Destroy this key, zeroizing the master secret it holds.

The key identifier I, the parameter sets, the index and the cached Merkle tree nodes are retained - none of them is secret, and the public key stays derivable where the tree's root is already cached. After destruction isDestroyed() returns true and getMasterSecret(), getEncoded(), generateLMSContext() and the derivation of child trees throw IllegalStateException; a signature attempt fails before its one-time index is claimed. Note: keys repositioned within this tree or split off it with extractKeyShard(int) share its master secret array, so destroying this key invalidates them too.

Specified by:

destroy in interface Destroyable

isDestroyed

public boolean isDestroyed()

Specified by:

isDestroyed in interface Destroyable

getIndexLimit

public int getIndexLimit()

getUsagesRemaining

public long getUsagesRemaining()

Specified by:

getUsagesRemaining in interface LMSContextBasedSigner

getPublicKey

public LMSPublicKeyParameters getPublicKey()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getEncoded

public byte[] getEncoded()
                  throws IOException

Description copied from interface: Encodable

Return a byte array representing the implementing object.

Specified by:

getEncoded in interface Encodable

Specified by:

getEncoded in class LMSKeyParameters

Returns:

a byte array representing the encoding.

Throws:

IOException - if an issue arises generation the encoding.