Create the DSA public key from a Set of Digital Signature Algorithm (DSA) Parameters : Digital Signature Algorithm DSA « Security « Java






  1. Java
  2. Security
  3. Digital Signature Algorithm DSA

Create the DSA public key from a Set of Digital Signature Algorithm (DSA) Parameters

  
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.DSAPrivateKeySpec;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.KeySpec;

public class Main {
  public static void main(String[] argv) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    keyGen.initialize(1024);
    KeyPair keypair = keyGen.genKeyPair();
    DSAPrivateKey privateKey = (DSAPrivateKey) keypair.getPrivate();
    DSAPublicKey publicKey = (DSAPublicKey) keypair.getPublic();

    DSAParams dsaParams = privateKey.getParams();
    BigInteger p = dsaParams.getP();
    BigInteger q = dsaParams.getQ();
    BigInteger g = dsaParams.getG();
    BigInteger x = privateKey.getX();
    BigInteger y = publicKey.getY();

    KeyFactory keyFactory = KeyFactory.getInstance("DSA");
    KeySpec publicKeySpec = new DSAPublicKeySpec(y, p, q, g);
    PublicKey publicKey1 = keyFactory.generatePublic(publicKeySpec);
  }
}








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1.Getting the Digital Signature Algorithm (DSA) Parameters of a Key Pair
2.Create the DSA key factory from a Set of Digital Signature Algorithm (DSA) Parameters
3.Create the DSA private key from a Set of Digital Signature Algorithm (DSA) Parameters
4.This program demonstrates how to sign a message with a private DSA key and verify it with the matching public key