Java Doc for DSAKeyPairGenerator.java in  » 6.0-JDK-Modules » j2me » java » security » interfaces » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.security.interfaces 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.security.interfaces.DSAKeyPairGenerator

All known Subclasses:   sun.security.provider.DSAKeyPairGenerator,
DSAKeyPairGenerator
public interface DSAKeyPairGenerator (Code)
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:   java.security.KeyPairGenerator





Method Summary
public  voidinitialize(DSAParams params, SecureRandom random)
     Initializes the key pair generator using p, q and g, the DSA family parameters.
public  voidinitialize(int modlen, boolean genParams, SecureRandom random)
     Initializes the key pair generator for a given modulus length, without parameters.



Method Detail
initialize
public void initialize(DSAParams params, SecureRandom random) throws InvalidParameterException(Code)
Initializes the key pair generator using p, q and g, the DSA family parameters.
Parameters:
  params - the parameters to use to generate the keys.
Parameters:
  random - the random bit source to use to generate key bits.
exception:
  InvalidParameterException - if the parameters passed areinvalid or null.



initialize
public void initialize(int modlen, boolean genParams, SecureRandom random) throws InvalidParameterException(Code)
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 anymultiple of 8 between 512 and 1024, inclusive.
Parameters:
  random - the random bit source to use to generate key bits.
Parameters:
  genParams - whether or not to generate new parameters forthe modulus length requested.
exception:
  InvalidParameterException - if the modulus length is notbetween 512 and 1024, or if genParams is false and there arenot precomputed parameters for the modulus length requested.




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