iaik.security.dsa

Class SHA224withDSAParameterGenerator

java.lang.Object

java.security.AlgorithmParameterGeneratorSpi

iaik.security.dsa.SHA2withDSAParameterGenerator

iaik.security.dsa.SHA224withDSAParameterGenerator

public class SHA224withDSAParameterGenerator
extends SHA2withDSAParameterGenerator

SHA-224 based DSA parameter generator.

This class represents a DSA parameter generator that uses the SHA-224 hash algorithm for generating DSA parameters p, q and r (prime modulus, prime divisor and generator, respectively) according to DSA FIPS 186-3.

This generator may be initialized with the desired prime modulus and prime divisor length (L and N, respectively). Notice that FIPS 186-3 (June 2009) allows the following (L,N) pairs to may be used:

• L = 1024, N = 160
• L = 2048, N = 224
• L = 2048, N = 256
• L = 3072, N = 256

AlgorithmIdentfiers for DSA with SHA-224 and SHA-256 are specified in draft-ietf-pkix-sha2-dsa-ecdsa-06.txt. SHA-224 may be used only with (1024,160) and (2048,224) L,N pairs.

If this generator is used without explicit initialization by default 2048 is used as the bit length of the prime modulus L. The default length of the prime divisor N is set to the output length of the SHA-224 hash algorithm (224 bits).

For explictly specifying prime modulus and prime divisor length when initializing this DSA parameter generator use a SHA2withDSAGenParameterSpec object, e.g.:

 int L = 2048;
 int N = 224;
 SHA2withDSAGenParameterSpec genParamSpec = new SHA2withDSAGenParameterSpec(L, N);
 AlgorithmParameterGenerator generator = 
   AlgorithmParameterGenerator.getInstance("SHA224withDSA", "IAIK");
 SecureRandom random = ...;
 generator.init(genParamSpec, random);
 AlgortithmParameters params = generator.generateParameters(); 
 

Version:

File Revision 2

See Also:

SHA2withDSAGenParameterSpec, SHA256withDSAParameterGenerator

Constructor Summary

Constructors

Constructor and Description
SHA224withDSAParameterGenerator() Default constructor.

Method Summary

Methods inherited from class iaik.security.dsa.SHA2withDSAParameterGenerator

engineGenerateParameters, engineInit, engineInit, validateParameters

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SHA224withDSAParameterGenerator

public SHA224withDSAParameterGenerator()

Default constructor.