java.security

Class KeyFactorySpi

Contents

  • public abstract class KeyFactorySpi
extends Object
    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.

    Since:
    1.2
    See Also:
    KeyFactory, Key, PublicKey, PrivateKey, KeySpec, DSAPublicKeySpec, X509EncodedKeySpec

    • Constructor Detail

      • KeyFactorySpi

        public KeyFactorySpi()

    • Method Detail

      • engineGeneratePublic

        protected abstract PublicKey engineGeneratePublic(KeySpec keySpec)
                                           throws InvalidKeySpecException
        Generates a public key object from the provided key specification (key material).
        Parameters:
        keySpec - the specification (key material) of the public key.
        Returns:
        the public key.
        Throws:
        InvalidKeySpecException - if the given key specification is inappropriate for this key factory to produce a public key.

      • engineGeneratePrivate

        protected abstract PrivateKey engineGeneratePrivate(KeySpec keySpec)
                                             throws InvalidKeySpecException
        Generates a private key object from the provided key specification (key material).
        Parameters:
        keySpec - the specification (key material) of the private key.
        Returns:
        the private key.
        Throws:
        InvalidKeySpecException - if the given key specification is inappropriate for this key factory to produce a private key.

      • engineGetKeySpec

        protected abstract <T extends KeySpec> T engineGetKeySpec(Key key,
                                     Class<T> keySpec)
                                               throws InvalidKeySpecException
        Returns a specification (key material) of the given key object. 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.
        Parameters:
        key - the key.
        keySpec - the specification class in which the key material should be returned.
        Returns:
        the underlying key specification (key material) in an instance of the requested specification class.
        Throws:
        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).

      • engineTranslateKey

        protected abstract Key engineTranslateKey(Key key)
                                   throws InvalidKeyException
        Translates a key object, whose provider may be unknown or potentially untrusted, into a corresponding key object of this 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 key factory.

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/security/keyfactoryspi.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut