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* accompanied this code).
*
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package java.security;
import java.security.spec.AlgorithmParameterSpec;
/**
* <p> This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
* for the <code>KeyPairGenerator</code> class, which is used to generate
* pairs of public and private keys.
*
* <p> All the abstract methods in this class must be implemented by each
* cryptographic service provider who wishes to supply the implementation
* of a key pair generator for a particular algorithm.
*
* <p> In case the client does not explicitly initialize the KeyPairGenerator
* (via a call to an <code>initialize</code> method), each provider must
* supply (and document) a default initialization.
* For example, the <i>Sun</i> provider uses a default modulus size (keysize)
* of 1024 bits.
*
* @author Benjamin Renaud
*
*
* @see KeyPairGenerator
* @see java.security.spec.AlgorithmParameterSpec
*/
public abstract class KeyPairGeneratorSpi {
/**
* Initializes the key pair generator for a certain keysize, using
* the default parameter set.
*
* @param keysize the keysize. This is an
* algorithm-specific metric, such as modulus length, specified in
* number of bits.
*
* @param random the source of randomness for this generator.
*
* @exception InvalidParameterException if the <code>keysize</code> is not
* supported by this KeyPairGeneratorSpi object.
*/
public abstract void initialize(int keysize, SecureRandom random);
/**
* Initializes the key pair generator using the specified parameter
* set and user-provided source of randomness.
*
* <p>This concrete method has been added to this previously-defined
* abstract class. (For backwards compatibility, it cannot be abstract.)
* It may be overridden by a provider to initialize the key pair
* generator. Such an override
* is expected to throw an InvalidAlgorithmParameterException if
* a parameter is inappropriate for this key pair generator.
* If this method is not overridden, it always throws an
* UnsupportedOperationException.
*
* @param params the parameter set used to generate the keys.
*
* @param random the source of randomness for this generator.
*
* @exception InvalidAlgorithmParameterException if the given parameters
* are inappropriate for this key pair generator.
*
* @since 1.2
*/
public void initialize(AlgorithmParameterSpec params,
SecureRandom random)
throws InvalidAlgorithmParameterException {
throw new UnsupportedOperationException();
}
/**
* Generates a key pair. Unless an initialization method is called
* using a KeyPairGenerator interface, algorithm-specific defaults
* will be used. This will generate a new key pair every time it
* is called.
*
* @return the newly generated <tt>KeyPair</tt>
*/
public abstract KeyPair generateKeyPair();
}