java.security.KeyPairGeneratorSpi Maven / Gradle / Ivy
/*
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This work corresponds to the API signatures of JSR 219: Foundation
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*/
package java.security;
import java.security.spec.AlgorithmParameterSpec;
/**
*
This class defines the Service Provider Interface (SPI)
* for the KeyPairGenerator class, which is used to generate
* pairs of public and private keys.
*
*
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.
*
*
In case the client does not explicitly initialize the KeyPairGenerator
* (via a call to an initialize method), each provider must
* supply (and document) a default initialization.
* For example, the Sun provider uses a default modulus size (keysize)
* of 1024 bits.
*
* @author Benjamin Renaud
*
* @version 1.11, 02/02/00
*
* @see KeyPairGenerator
* @see java.security.spec.AlgorithmParameterSpec
*/
public abstract class KeyPairGeneratorSpi
{
public 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 keysize 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.
*
*
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
{ }
/**
* 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 KeyPair
*/
public abstract KeyPair generateKeyPair();
}