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Class javax.crypto.SecretKeyFactorySpi

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

public abstract class SecretKeyFactorySpi
extends 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 DES secret-key factory supplied by the "SunJCE" provider supports DESKeySpec as a transparent representation of DES keys, and that provider's secret-key factory for Triple DES keys supports DESedeKeySpec as a transparent representation of Triple DES keys.

See Also:
SecretKey, DESKeySpec, DESedeKeySpec

Constructor Index

 o SecretKeyFactorySpi()

Method Index

 o engineGenerateSecret(KeySpec)
Generates a SecretKey object from the provided key specification (key material).
 o engineGetKeySpec(SecretKey, Class)
Returns a specification (key material) of the given key object in the requested format.
 o engineTranslateKey(SecretKey)
Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this key factory.

Constructors

 o SecretKeyFactorySpi
 public SecretKeyFactorySpi()

Methods

 o engineGenerateSecret
 protected abstract SecretKey engineGenerateSecret(KeySpec keySpec) throws 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: InvalidKeySpecException
if the given key specification is inappropriate for this key factory to produce a secret key.
 o engineGetKeySpec
 protected abstract KeySpec engineGetKeySpec(SecretKey key,
                                             Class keySpec) throws 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:
s the underlying key specification (key material) in the requested format
Throws: 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 unrecognised format).
 o engineTranslateKey
 protected abstract SecretKey engineTranslateKey(SecretKey key) throws 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:
s the translated key
Throws: InvalidKeyException
if the given key cannot be processed by this key factory.

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