public final class

RSAKeyPairGenerator

extends KeyPairGeneratorSpi
java.lang.Object
   ↳ java.security.KeyPairGeneratorSpi
     ↳ sun.security.rsa.RSAKeyPairGenerator

Class Overview

RSA keypair generation. Standard algorithm, minimum key length 512 bit. We generate two random primes until we find two where phi is relative prime to the public exponent. Default exponent is 65537. It has only bit 0 and bit 4 set, which makes it particularly efficient.

Summary

Public Constructors
RSAKeyPairGenerator()
Public Methods
KeyPair generateKeyPair()
Generates a key pair.
void initialize(AlgorithmParameterSpec params, SecureRandom random)
Initializes the key pair generator using the specified parameter set and user-provided source of randomness.
void initialize(int keySize, SecureRandom random)
Initializes the key pair generator for a certain keysize, using the default parameter set.
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Inherited Methods
From class java.security.KeyPairGeneratorSpi
From class java.lang.Object

Public Constructors

public RSAKeyPairGenerator ()

Public Methods

public KeyPair generateKeyPair ()

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.

Returns
  • the newly generated KeyPair

public void initialize (AlgorithmParameterSpec params, 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.

Parameters
params the parameter set used to generate the keys.
random the source of randomness for this generator.

public void initialize (int keySize, SecureRandom random)

Initializes the key pair generator for a certain keysize, using the default parameter set.

Parameters
keySize the keysize. This is an algorithm-specific metric, such as modulus length, specified in number of bits.
random the source of randomness for this generator.