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java.lang.Object | +--javax.crypto.SecretKeyFactory
This class represents a factory for secret keys.
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. Secret key factories operate only on secret (symmetric) keys.
Key factories are bi-directional, i.e., they allow 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.
Application developers should refer to their provider's documentation to find out which key specifications are supported by the generateSecret and getKeySpec methods. 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.
SecretKey
,
DESKeySpec
,
DESedeKeySpec
,
PBEKeySpec
Constructor Summary | |
protected |
SecretKeyFactory(SecretKeyFactorySpi keyFacSpi,
java.security.Provider provider,
java.lang.String algorithm)
Creates a SecretKeyFactory object. |
Method Summary | |
SecretKey |
generateSecret(java.security.spec.KeySpec keySpec)
Generates a SecretKey object from the provided key specification (key material). |
java.lang.String |
getAlgorithm()
Returns the algorithm name of this SecretKeyFactory object. |
static SecretKeyFactory |
getInstance(java.lang.String algorithm)
Generates a SecretKeyFactory object for the specified secret key algorithm. |
static SecretKeyFactory |
getInstance(java.lang.String algorithm,
java.lang.String provider)
Generates a SecretKeyFactory object for the specified secret key algorithm from the specified provider. |
java.security.spec.KeySpec |
getKeySpec(SecretKey key,
java.lang.Class keySpec)
Returns a specification (key material) of the given key object in the requested format. |
java.security.Provider |
getProvider()
Returns the provider of this SecretKeyFactory object. |
SecretKey |
translateKey(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 |
protected SecretKeyFactory(SecretKeyFactorySpi keyFacSpi, java.security.Provider provider, java.lang.String algorithm)
keyFacSpi
- the delegateprovider
- the providerMethod Detail |
public static final SecretKeyFactory getInstance(java.lang.String algorithm) throws java.security.NoSuchAlgorithmException
algorithm
- the standard name of the requested secret key
algorithm. See Appendix A in the Java Cryptography
Extension API Specification & Reference for information
about standard algorithm names.public static final SecretKeyFactory getInstance(java.lang.String algorithm, java.lang.String provider) throws java.security.NoSuchAlgorithmException, java.security.NoSuchProviderException
algorithm
- the standard name of the requested secret key
algorithm. See Appendix A in the Java Cryptography
Extension API Specification & Reference for information
about standard algorithm names.provider
- the name of the provider.public final java.security.Provider getProvider()
public final java.lang.String getAlgorithm()
public final SecretKey generateSecret(java.security.spec.KeySpec keySpec) throws java.security.spec.InvalidKeySpecException
keySpec
- the specification (key material) of the secret keypublic final java.security.spec.KeySpec getKeySpec(SecretKey key, java.lang.Class keySpec) throws java.security.spec.InvalidKeySpecException
key
- the keykeySpec
- the requested format in which the key material
shall be returnedpublic final SecretKey translateKey(SecretKey key) throws java.security.InvalidKeyException
key
- the key whose provider is unknown or untrusted
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