Keys generated using DiffieHellman algorithm return "DH", instead of
the full name "DiffieHellman" used by KeyPairGenerator,
when Key.getAlgorithm() is called.

import java.security.*;

public class GetAlgorithmTest {
    public static void main(String[] args) throws Exception {
        String[] algorithm = {"RSA", "DiffieHellman", "RSA"};
        String[] provider = {"SunJSSE", "SunJCE", "SunRsaSign"};
        for (int i = 0; i < 3; i++) {
            System.out.println("Algorithm: " + algorithm[i] + ", Provider: " + provider[i]);
            KeyPairGenerator generator = KeyPairGenerator.getInstance(algorithm[i], provider[i]);
            KeyPair keys = generator.genKeyPair();
            PublicKey k1 = keys.getPublic();
            PrivateKey k2 = keys.getPrivate();
            String alg1 = k1.getAlgorithm();
            String alg2 = k2.getAlgorithm();
            String format1 = k1.getFormat();
            String format2 = k2.getFormat();
            if (!alg1.equals(algorithm[i])) {
                System.out.println("getAlgorithm() on public key returns " + alg1);
                System.out.println("expected is " + algorithm[i]);
            }
            if (!alg2.equals(algorithm[i])) {
                System.out.println("getAlgorithm() on public key returns " + alg2);
                System.out.println("expected is " + algorithm[i]);
            }
            if (!format1.equals("X.509")) {
                System.out.println("getFormat() on public key returns " + format1);
                System.out.println("X.509 expected");
            }
            if (!format2.equals("PKCS#8")) {
                System.out.println("getFormat() on private key returns " + format2);
                System.out.println("PKCS#8 expected");
            }
            System.out.println();
        }
    }
}

Output:

Algorithm: RSA, Provider: SunJSSE

Algorithm: DiffieHellman, Provider: SunJCE
getAlgorithm() on public key returns DH
expected is DiffieHellman
getAlgorithm() on public key returns DH
expected is DiffieHellman

Algorithm: RSA, Provider: SunRsaSign

This problem does not occur on DSA or RSA algorithm.


###@###.### 2004-12-15 19:40:35 GMT