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java.security
Class KeyFactory

java.lang.Object
  java.security.KeyFactory

public class KeyFactory
extends java.lang.Object

Key factories are used to convert key specifications (transparent representations of the underlying key material) into keys (opaque cryptographic keys of type Key).

Since:

1.2

Version:

1.28, 05/07/02

Author:

Jan Luehe

See Also:

Key, PublicKey, KeySpec, X509EncodedKeySpec

Method Summary

PublicKey	generatePublic(KeySpec keySpec) Generates a public key object from the provided key specification (key material).
static KeyFactory	getInstance(java.lang.String algorithm) Generates a KeyFactory object that implements the specified algorithm.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static KeyFactory getInstance(java.lang.String algorithm)
                              throws NoSuchAlgorithmException

Generates a KeyFactory object that implements the specified algorithm.

Parameters:

algorithm - the name of the requested key algorithm. See Appendix A in the Java Cryptography Architecture API Specification & Reference for information about standard algorithm names.

Returns:

a KeyFactory object for the specified algorithm.

Throws:

NoSuchAlgorithmException - if the requested algorithm is not available

generatePublic

public final PublicKey generatePublic(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.