[Jsdsi-users] < How to generate different Keypairs correctly? >

[Feng-Shuo <fc...@an...>]

Dear Sameer, Sean, and jsdsi experts,
     I read the mail list in archive about "Sun KeyPairGeneratory" but I =
still don't really know how to generate different Keypairs through jsdsi =
API.

Following are some of ways I tried but neither one of them works well, =
could you tell me what is the correct way to generate?
 1.    java.math.BigInteger s_m =3D new java.math.BigInteger("1024");
        java.math.BigInteger s_e =3D new java.math.BigInteger("9");
        jsdsi.RSAPublicKey s_rsapk =3D new jsdsi.RSAPublicKey(s_m, s_e, =
"RSA");

        KeyPair s_pair =3D s_rsapk.create();
        PrivateKey s_priv =3D s_pair.getPrivate();
        jsdsi.PublicKey s_pub =3D (jsdsi.PublicKey) s_pair.getPublic();
      =20
 ---> This method always generate the same Keypair

 2.  KeyPairGenerator keyGen =3D KeyPairGenerator.getInstance("RSA");
      RSAKeyGenParameterSpec rsagen =3D new =
RSAKeyGenParameterSpec(1024,RSAKeyGenParameterSpec.F0);
      keyGen.initialize(rsagen);

      KeyPair s_test_pair =3D keyGen.generateKeyPair();
      PrivateKey s_priv =3D s_test_pair.getPrivate();

      //-->Class Cast Error: jsdsi.PublicKey s_pub =3D (jsdsi.PublicKey) =
s_test_pair.getPublic();
      java.security.interfaces.RSAPublicKey pub =3D =
(java.security.interfaces.RSAPublicKey)s_test_pair.getPublic();
      jsdsi.RSAPublicKey s_pub =3D new jsdsi.RSAPublicKey(pub);
       =20
 ---> Throw Class Cast Error when pass KeyPair into "create" method in =
"signature" class
       (I think error is occured in " assert(kp.getPublic() instanceof =
Principal) within signature class ")
       =20
3.  KeyPairGenerator keyGen =3D KeyPairGenerator.getInstance("RSA");
     RSAKeyGenParameterSpec rsagen =3D new =
RSAKeyGenParameterSpec(1024,RSAKeyGenParameterSpec.F0);
     keyGen.initialize(rsagen);

     KeyPair s_test_pair =3D keyGen.generateKeyPair();
     PrivateKey s_priv =3D s_test_pair.getPrivate();

     java.security.interfaces.RSAPublicKey pub =3D =
(java.security.interfaces.RSAPublicKey)s_test_pair.getPublic();
     jsdsi.RSAPublicKey s_pub =3D new jsdsi.RSAPublicKey(pub);
     /* Create another keypair from jsdsi.RSAPublicKey.create() */
     KeyPair s_pair =3D s_pub.create();
        =20
 ---> This method always generate the same Keypair

Regards,

Matt