public abstract class SecretKeyFactorySpi extends Object
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.
Constructor | Description |
---|---|
SecretKeyFactorySpi() |
Constructor for subclasses to call. |
Modifier and Type | Method | Description |
---|---|---|
protected abstract SecretKey |
engineGenerateSecret |
Generates a SecretKey object from the provided key specification (key material). |
protected abstract KeySpec |
engineGetKeySpec |
Returns a specification (key material) of the given key object in the requested format. |
protected abstract SecretKey |
engineTranslateKey |
Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this secret-key factory. |
public SecretKeyFactorySpi()
protected abstract SecretKey engineGenerateSecret(KeySpec keySpec) throws InvalidKeySpecException
SecretKey
object from the provided key specification (key material).keySpec
- the specification (key material) of the secret keyInvalidKeySpecException
- if the given key specification is inappropriate for this secret-key factory to produce a secret key.protected abstract KeySpec engineGetKeySpec(SecretKey key, Class<?> keySpec) throws InvalidKeySpecException
key
- the keykeySpec
- the requested format in which the key material shall be returnedInvalidKeySpecException
- 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).protected abstract SecretKey engineTranslateKey(SecretKey key) throws InvalidKeyException
key
- the key whose provider is unknown or untrustedInvalidKeyException
- if the given key cannot be processed by this secret-key factory.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/javax/crypto/SecretKeyFactorySpi.html