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# Interface java.security.interfaces.RSAKeyPairGenerator

public interface RSAKeyPairGenerator

An interface to an object capable of generating RSA key pairs. The generator is first initialized, then used to generate one or more key pairs.

Users wishing to indicate the public exponent, and to generate a key pair suitable for use with the RSA algorithm typically

1. Get a key pair generator for the RSA algorithm by calling the KeyPairGenerator `getInstance` method with "RSA" as its argument.

2. Initialize the generator by casting the result to an RSAKeyPairGenerator and calling the `initialize` method from this RSAKeyPairGenerator interface.

3. Generate one or more key pairs by calling the `generateKeyPair` method from the KeyPairGenerator class, as often as desired.

Note: it is not always necessary to do do algorithm-specific initialization for an RSA key pair generator. That is, it is not always necessary to call the `initialize` method in this interface. Algorithm-independent initialization using the `initialize` method in the KeyPairGenerator interface is all that is needed when you accept defaults for algorithm-specific parameters.

See Also:
  KeyPairGenerator

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initialize(int, BigInteger, SecureRandom)
  Initializes the key pair generator using the specified "strength" (desired key length in bits), public exponent, and source of random bits.

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initialize

     public abstract void initialize(int strength,
                                     BigInteger publicExponent,
                                     SecureRandom random) throws InvalidParameterException

  Initializes the key pair generator using the specified "strength" (desired key length in bits), public exponent, and source of random bits. Typical values for the public exponent are the Fermat primes F4 and F0 (0x10001 and 0x11) and, less commonly, 17.

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