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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.security.KeyFactorySpi
public abstract class KeyFactorySpi
This class defines the Service Provider Interface (SPI)
for the KeyFactory
class.
All the abstract methods in this class must be implemented by each
cryptographic service provider who wishes to supply the implementation
of a key factory for a particular algorithm.
Key factories are used to convert keys (opaque
cryptographic keys of type Key
) into key specifications
(transparent representations of the underlying key material), and vice
versa.
Key factories are bi-directional. That is, they allow you to build an opaque key object from a given key specification (key material), or to retrieve the underlying key material of a key object in a suitable format.
Multiple compatible key specifications may exist for the same key.
For example, a DSA public key may be specified using
DSAPublicKeySpec
or
X509EncodedKeySpec
. A key factory can be used to translate
between compatible key specifications.
A provider should document all the key specifications supported by its key factory.
KeyFactory
,
Key
,
PublicKey
,
PrivateKey
,
KeySpec
,
DSAPublicKeySpec
,
X509EncodedKeySpec
Constructor Summary | |
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KeyFactorySpi()
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Method Summary | ||
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protected abstract PrivateKey |
engineGeneratePrivate(KeySpec keySpec)
Generates a private key object from the provided key specification (key material). |
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protected abstract PublicKey |
engineGeneratePublic(KeySpec keySpec)
Generates a public key object from the provided key specification (key material). |
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protected abstract
|
engineGetKeySpec(Key key,
Class<T> keySpec)
Returns a specification (key material) of the given key object. |
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protected abstract Key |
engineTranslateKey(Key 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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public KeyFactorySpi()
Method Detail |
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protected abstract PublicKey engineGeneratePublic(KeySpec keySpec) throws InvalidKeySpecException
keySpec
- the specification (key material) of the public key.
InvalidKeySpecException
- if the given key specification
is inappropriate for this key factory to produce a public key.protected abstract PrivateKey engineGeneratePrivate(KeySpec keySpec) throws InvalidKeySpecException
keySpec
- the specification (key material) of the private key.
InvalidKeySpecException
- if the given key specification
is inappropriate for this key factory to produce a private key.protected abstract <T extends KeySpec> T engineGetKeySpec(Key key, Class<T> keySpec) throws InvalidKeySpecException
keySpec
identifies the specification class in which
the key material should be returned. It could, for example, be
DSAPublicKeySpec.class
, to indicate that the
key material should be returned in an instance of the
DSAPublicKeySpec
class.
key
- the key.keySpec
- the specification class in which
the key material should be returned.
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).protected abstract Key engineTranslateKey(Key key) throws InvalidKeyException
key
- the key whose provider is unknown or untrusted.
InvalidKeyException
- if the given key cannot be processed
by this key factory.
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Java™ Platform Standard Ed. 6 |
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