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# Interface java.security.interfaces.DSAKeyPairGenerator

public interface DSAKeyPairGenerator

An interface to an object capable of generating DSA key pairs.

The `initialize` methods may each be called any number of times. If no `initialize` method is called on a DSAKeyPairGenerator, the default is to generate 1024-bit keys, using precomputed p, q and g parameters and an instance of SecureRandom as the random bit source.

Users wishing to indicate DSA-specific parameters, and to generate a key pair suitable for use with the DSA algorithm typically

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

2. Initialize the generator by casting the result to a DSAKeyPairGenerator and calling one of the `initialize` methods from this DSAKeyPairGenerator interface.

3. Generate a key pair by calling the `generateKeyPair` method from the KeyPairGenerator class.

Note: it is not always necessary to do do algorithm-specific initialization for a DSA key pair generator. That is, it is not always necessary to call an `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

##

initialize(DSAParams, SecureRandom)
  Initializes the key pair generator using p, q and g, the DSA family parameters.
initialize(int, boolean, SecureRandom)
  Initializes the key pair generator for a given modulus length, without parameters.

##

initialize

     public abstract void initialize(DSAParams params,
                                     SecureRandom random) throws InvalidParameterException

  Initializes the key pair generator using p, q and g, the DSA family parameters.

  Parameters:
    params - the parameters to use to generate the keys.
    random - the random bit source to use to generate key bits.
  Throws: InvalidParameterException
    if the parameters passed are invalid or null.

initialize

     public abstract void initialize(int modlen,
                                     boolean genParams,
                                     SecureRandom random) throws InvalidParameterException

  Initializes the key pair generator for a given modulus length, without parameters.

  If `genParams` is true, this method will generate new p, q and g parameters. If it is false, the method will use precomputed parameters for the modulus length requested. If there are no precomputed parameters for that modulus length, an exception will be thrown. It is guaranteed that there will always be default parameters for modulus lengths of 512 and 1024 bits.

  Parameters:
    modlen - the modulus length, in bits. Valid values are any multiple of 8 between 512 and 1024, inclusive.
    random - the random bit source to use to generate key bits.
    genParams - whether or not to generate new parameters for the modulus length requested.
  Throws: InvalidParameterException
    if the modulus length is not between 512 and 1024, or if genParams is false and there are not precomputed parameters for the modulus length requested.

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