META-INF.modules.java.base.classes.javax.crypto.SecretKeyFactorySpi Maven / Gradle / Ivy
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package javax.crypto;
import java.security.*;
import java.security.spec.*;
/**
* 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.
*
* @author Jan Luehe
*
* @see SecretKey
* @see javax.crypto.spec.DESKeySpec
* @see javax.crypto.spec.DESedeKeySpec
* @since 1.4
*/
public abstract class SecretKeyFactorySpi {
/**
* Generates a SecretKey object from the
* provided key specification (key material).
*
* @param keySpec the specification (key material) of the secret key
*
* @return the secret key
*
* @exception InvalidKeySpecException if the given key specification
* is inappropriate for this secret-key factory to produce a secret key.
*/
protected abstract SecretKey engineGenerateSecret(KeySpec keySpec)
throws InvalidKeySpecException;
/**
* Returns a specification (key material) of the given key
* object in the requested format.
*
* @param key the key
*
* @param keySpec the requested format in which the key material shall be
* returned
*
* @return the underlying key specification (key material) in the
* requested format
*
* @exception 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).
*/
protected abstract KeySpec engineGetKeySpec(SecretKey key, Class keySpec)
throws InvalidKeySpecException;
/**
* Translates a key object, whose provider may be unknown or
* potentially untrusted, into a corresponding key object of this
* secret-key factory.
*
* @param key the key whose provider is unknown or untrusted
*
* @return the translated key
*
* @exception InvalidKeyException if the given key cannot be processed
* by this secret-key factory.
*/
protected abstract SecretKey engineTranslateKey(SecretKey key)
throws InvalidKeyException;
}