Overview  Package   Class  Use  Deprecated  Index
Home >> All >> javax >> [ crypto overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

javax.crypto
Class ExemptionMechanism  

java.lang.Object
  javax.crypto.ExemptionMechanism

---

public class ExemptionMechanism

extends java.lang.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

---

Field Summary
private  ExemptionMechanismSpi	emSpi
private  java.lang.String	mechanism
private  java.security.Provider	provider
private static java.lang.String	SERVICE
private  boolean	virgin

 

Constructor Summary
protected	ExemptionMechanism(ExemptionMechanismSpi emSpi, java.security.Provider provider, java.lang.String mechanism)

 

Method Summary
protected  void	finalize()           Called on an object by the Virtual Machine at most once, at some point after the Object is determined unreachable but before it is destroyed.
byte[]	genExemptionBlob()
int	genExemptionBlob(byte[] output)
int	genExemptionBlob(byte[] output, int outputOffset)
static ExemptionMechanism	getInstance(java.lang.String mechanism)
static ExemptionMechanism	getInstance(java.lang.String mechanism, java.security.Provider provider)
static ExemptionMechanism	getInstance(java.lang.String mechanism, java.lang.String provider)
java.lang.String	getName()
int	getOutputSize(int inputLength)
java.security.Provider	getProvider()
void	init(java.security.Key key)
void	init(java.security.Key key, java.security.AlgorithmParameters params)
void	init(java.security.Key key, java.security.spec.AlgorithmParameterSpec params)
boolean	isCryptoAllowed(java.security.Key key)

 

Methods inherited from class java.lang.Object

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

 

Field Detail

SERVICE

private static final java.lang.String SERVICE

See Also:

Constant Field Values

---

emSpi

private ExemptionMechanismSpi emSpi

---

provider

private java.security.Provider provider

---

mechanism

private java.lang.String mechanism

---

virgin

private boolean virgin

Constructor Detail

ExemptionMechanism

protected ExemptionMechanism(ExemptionMechanismSpi emSpi,
                             java.security.Provider provider,
                             java.lang.String mechanism)

Method Detail

getInstance

public static final ExemptionMechanism getInstance(java.lang.String mechanism)
                                            throws java.security.NoSuchAlgorithmException

---

getInstance

public static final ExemptionMechanism getInstance(java.lang.String mechanism,
                                                   java.lang.String provider)
                                            throws java.security.NoSuchAlgorithmException,
                                                   java.security.NoSuchProviderException

---

getInstance

public static final ExemptionMechanism getInstance(java.lang.String mechanism,
                                                   java.security.Provider provider)
                                            throws java.security.NoSuchAlgorithmException

---

genExemptionBlob

public final byte[] genExemptionBlob()
                              throws java.lang.IllegalStateException,
                                     ExemptionMechanismException

---

genExemptionBlob

public final int genExemptionBlob(byte[] output)
                           throws java.lang.IllegalStateException,
                                  ExemptionMechanismException,
                                  ShortBufferException

---

genExemptionBlob

public final int genExemptionBlob(byte[] output,
                                  int outputOffset)
                           throws java.lang.IllegalStateException,
                                  ExemptionMechanismException,
                                  ShortBufferException

---

getName

public final java.lang.String getName()

---

getOutputSize

public final int getOutputSize(int inputLength)
                        throws java.lang.IllegalStateException

---

getProvider

public final java.security.Provider getProvider()

---

init

public final void init(java.security.Key key)
                throws ExemptionMechanismException,
                       java.security.InvalidKeyException

---

init

public final void init(java.security.Key key,
                       java.security.AlgorithmParameters params)
                throws ExemptionMechanismException,
                       java.security.InvalidAlgorithmParameterException,
                       java.security.InvalidKeyException

---

init

public final void init(java.security.Key key,
                       java.security.spec.AlgorithmParameterSpec params)
                throws ExemptionMechanismException,
                       java.security.InvalidAlgorithmParameterException,
                       java.security.InvalidKeyException

---

isCryptoAllowed

public final boolean isCryptoAllowed(java.security.Key key)
                              throws ExemptionMechanismException

---

finalize

protected void finalize()

Description copied from class: java.lang.Object

Called on an object by the Virtual Machine at most once, at some point after the Object is determined unreachable but before it is destroyed. You would think that this means it eventually is called on every Object, but this is not necessarily the case. If execution terminates abnormally, garbage collection does not always happen. Thus you cannot rely on this method to always work. For finer control over garbage collection, use references from the java.lang.ref package.

Virtual Machines are free to not call this method if they can determine that it does nothing important; for example, if your class extends Object and overrides finalize to do simply super.finalize().

finalize() will be called by a java.lang.Thread that has no locks on any Objects, and may be called concurrently. There are no guarantees on the order in which multiple objects are finalized. This means that finalize() is usually unsuited for performing actions that must be thread-safe, and that your implementation must be use defensive programming if it is to always work.

If an Exception is thrown from finalize() during garbage collection, it will be patently ignored and the Object will still be destroyed.

It is allowed, although not typical, for user code to call finalize() directly. User invocation does not affect whether automatic invocation will occur. It is also permitted, although not recommended, for a finalize() method to "revive" an object by making it reachable from normal code again.

Unlike constructors, finalize() does not get called for an object's superclass unless the implementation specifically calls super.finalize().

The default implementation does nothing.

---

Overview  Package   Class  Use  Deprecated  Index
Home >> All >> javax >> [ crypto overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---