Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Java™ Platform Standard Ed. 6
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## javax.crypto
Class 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.

Since:
  1.4
See Also:
  `SecretKey`, `DESKeySpec`, `DESedeKeySpec`

Constructor Summary
`SecretKeyFactorySpi()`

Method Summary
`protected abstract SecretKey` | `engineGenerateSecret(KeySpec keySpec)` Generates a `SecretKey` object from the provided key specification (key material).
`protected abstract KeySpec` | `engineGetKeySpec(SecretKey key, Class keySpec)` Returns a specification (key material) of the given key object in the requested format.
`protected abstract SecretKey` | `engineTranslateKey(SecretKey key)` Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this secret-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(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 secret-key factory to produce a secret key.

### 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:
    the underlying key specification (key material) in the requested format
  Throws:
    `InvalidKeySpecException` - if the requested key specification is inappropriate for the given key (e.g., the algorithms associated with `key` and `keySpec` do not match, or `key` references a key on a cryptographic hardware device whereas `keySpec` is the specification of a software-based key), or the given key cannot be dealt with (e.g., the given key has an algorithm or format not supported by this secret-key factory).

### 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 secret-key factory.

  Parameters:
    `key` - the key whose provider is unknown or untrusted
  Returns:
    the translated key
  Throws:
    `InvalidKeyException` - if the given key cannot be processed by this secret-key factory.

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Java™ Platform Standard Ed. 6
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2009 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.