ExemptionMechanism (GNU Classpath 0.94-pre Documentation)

Class ExemptionMechanism

public class ExemptionMechanism extends Object

An exemption mechanism, which will conditionally allow cryptography where it is not normally allowed, implements things such as key recovery, key weakening, or key escrow.

Implementation note: this class is present for API-compatibility only; it is not actually used anywhere in this library and this library does not, in general, support crypto weakening.

Since: 1.4

Constructor Summary
protected	ExemptionMechanism(ExemptionMechanismSpi emSpi, Provider provider, String mechanism)

Constructor Summary

protected

ExemptionMechanism(ExemptionMechanismSpi emSpi, Provider provider, String mechanism)

Method Summary
protected void	finalize()
byte[]	genExemptionBlob()
int	genExemptionBlob(byte[] output)
int	genExemptionBlob(byte[] output, int outputOffset)
static ExemptionMechanism	getInstance(String mechanism) Create an instance of `ExemptionMechanism` for a designated `mechanism` from the first Security Provider offering it.
static ExemptionMechanism	getInstance(String mechanism, String provider) Create an instance of `ExemptionMechanism` for a designated `mechanism` from a named `provider`.
static ExemptionMechanism	getInstance(String mechanism, Provider provider) Create an instance of `ExemptionMechanism` for a designated `mechanism` from a designated `provider`.
String	getName()
int	getOutputSize(int inputLength)
Provider	getProvider()
void	init(Key key)
void	init(Key key, AlgorithmParameters params)
void	init(Key key, AlgorithmParameterSpec params)
boolean	isCryptoAllowed(Key key)

Method Summary

protected void

finalize()

byte[]

genExemptionBlob()

int

genExemptionBlob(byte[] output)

int

genExemptionBlob(byte[] output, int outputOffset)

static ExemptionMechanism

getInstance(String mechanism)

Create an instance of ExemptionMechanism for a designated mechanism from the first Security Provider offering it.

static ExemptionMechanism

getInstance(String mechanism, String provider)

Create an instance of ExemptionMechanism for a designated mechanism from a named provider.

static ExemptionMechanism

getInstance(String mechanism, Provider provider)

Create an instance of ExemptionMechanism for a designated mechanism from a designated provider.

String

getName()

int

getOutputSize(int inputLength)

Provider

getProvider()

void

init(Key key)

void

init(Key key, AlgorithmParameters params)

void

init(Key key, AlgorithmParameterSpec params)

boolean

isCryptoAllowed(Key key)

Create an instance of ExemptionMechanism for a designated mechanism from the first Security Provider offering it.

Parameters: mechanism the name of the exemption mechanism to create.

Returns: a newly created instance of ExemptionMechanism.

Throws: IllegalArgumentException if the provider is null. NoSuchAlgorithmException if no such exemption mechanism is available from any known Security Provider. IllegalArgumentException if mechanism is null or is an empty string.

getInstance

Create an instance of ExemptionMechanism for a designated mechanism from a named provider.

Parameters: mechanism the name of the exemption mechanism to create. provider the security provider to provide the exemption mechanism.

Returns: a newly created instance of ExemptionMechanism.

Throws: NoSuchAlgorithmException if no such exemption mechanism is available from the named provider. NoSuchProviderException if no Security Provider with the designated name is known to the underlying JVM. IllegalArgumentException if either mechanism or provider is null, or if mechanism is an empty string.

getInstance

Create an instance of ExemptionMechanism for a designated mechanism from a designated provider.

Parameters: mechanism the name of the exemption mechanism to create. provider the security provider to provide the exemption mechanism.

Returns: a newly created instance of ExemptionMechanism.

Throws: NoSuchAlgorithmException if an exemption mechanism could not be created. IllegalArgumentException if either mechanism or provider is null, or if mechanism is an empty string.