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Class javax.crypto.SecretKeyFactorySpi

java.lang.Object
    |
    +----javax.crypto.SecretKeyFactorySpi

public abstract class SecretKeyFactorySpi
extends java.lang.Object
This class defines the Service Provider Interface (SPI) for the SecretKeyFactory class. All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a secret-key factory for a particular algorithm.

A provider should document all the key specifications supported by its secret key factory. For example, the Sun provider SecretKeyFactory for DES keys supports DESKeySpec as a transparent representation of DES keys, and the SecretKeyFactory for Triple DES keys supports DESedeKeySpec as a transparent representation of Triple DES keys.

See Also:
SecretKey, java.security.Key, java.security.KeyFactory, java.security.spec.KeySpec, DESKeySpec, DESedeKeySpec

Constructor Summary
 SecretKeyFactorySpi()
 
 

Method Summary
SecretKey  engineGenerateSecret(java.security.spec.KeySpec keySpec)
Generates a SecretKey object from the provided key specification (key material).
java.security.spec.KeySpec  engineGetKeySpec(SecretKey key, java.lang.Class keySpec)
Returns a specification (key material) of the given key object in the requested format.
SecretKey  engineTranslateKey(SecretKey key)
Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this key factory.
 
Methods inherited from class java.lang.Object
 clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SecretKeyFactorySpi

public SecretKeyFactorySpi()
Method Detail

engineGenerateSecret

protected abstract SecretKey engineGenerateSecret(java.security.spec.KeySpec keySpec) throws java.security.spec.InvalidKeySpecException
Generates a SecretKey object from the provided key specification (key material).
Parameters:
keySpec - the specification (key material) of the secret key
Returns:
the secret key
Throws:
java.security.spec.InvalidKeySpecException - if the given key specification is inappropriate for this key factory to produce a secret key.

engineGetKeySpec

protected abstract java.security.spec.KeySpec engineGetKeySpec(SecretKey key,
                                            java.lang.Class keySpec) throws java.security.spec.InvalidKeySpecException
Returns a specification (key material) of the given key object in the requested format.
Parameters:
key - the key
keySpec - the requested format in which the key material shall be returned
Returns:
the underlying key specification (key material) in the requested format
Throws:
java.security.spec.InvalidKeySpecException - if the requested key specification is inappropriate for the given key, or the given key cannot be dealt with (e.g., the given key has an unrecognized format).

engineTranslateKey

protected abstract SecretKey engineTranslateKey(SecretKey key) throws java.security.InvalidKeyException
Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this key factory.
Parameters:
key - the key whose provider is unknown or untrusted
Returns:
the translated key
Throws:
java.security.InvalidKeyException - if the given key cannot be processed by this key factory.

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