Examples of java.security.KeyFactory.generatePublic()

java.security.KeyFactory.generatePublic()
Generates a public key object from the provided key specification (key material). @param keySpec the specification (key material) of the public key. @return the public key. @exception InvalidKeySpecException if the given key specificationis inappropriate for this key factory to produce a public key.

        // public key encoding test
        //
        byte[]              pubEnc = vKey.getEncoded();
        KeyFactory          keyFac = KeyFactory.getInstance("ECGOST3410", "BC");
        X509EncodedKeySpec  pubX509 = new X509EncodedKeySpec(pubEnc);
        ECPublicKey         pubKey = (ECPublicKey)keyFac.generatePublic(pubX509);


        if (!pubKey.getW().equals(((ECPublicKey)vKey).getW()))
        {
            fail("public key encoding (Q test) failed");
        }

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      PublicKey           pubKey;


      KeyFactory  fact = KeyFactory.getInstance("RSA", "BC");


      privKey = fact.generatePrivate(privKeySpec);
      pubKey = fact.generatePublic(pubKeySpec);


      //
      // distinguished name table.
      //
      Vector                      ord = new Vector();

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        // key encoding test - BC decoding Sun keys
        //
        KeyFactory          f = KeyFactory.getInstance("DSA", "BC");
        X509EncodedKeySpec  x509s = new X509EncodedKeySpec(vKey.getEncoded());


        DSAPublicKey        k1 = (DSAPublicKey)f.generatePublic(x509s);


        checkPublic(k1, vKey);
        
        PKCS8EncodedKeySpec  pkcs8 = new PKCS8EncodedKeySpec(sKey.getEncoded());

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        // key decoding test - SUN decoding BC keys
        // 
        f = KeyFactory.getInstance("DSA", "SUN");
        x509s = new X509EncodedKeySpec(k1.getEncoded());
        
        vKey = (DSAPublicKey)f.generatePublic(x509s);


        checkPublic(k1, vKey);
        
        pkcs8 = new PKCS8EncodedKeySpec(k2.getEncoded());
        sKey = f.generatePrivate(pkcs8);

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                spec);
        
        Signature           sgr = Signature.getInstance("ECDSA", "BC");
        KeyFactory          f = KeyFactory.getInstance("ECDSA", "BC");
        PrivateKey          sKey = f.generatePrivate(priKey);
        PublicKey           vKey = f.generatePublic(pubKey);
        
        sgr.initSign(sKey, k);
        
        byte[] message = new byte[] { (byte)'a', (byte)'b', (byte)'c' };

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                spec);


        Signature           sgr = Signature.getInstance("NONEwithECDSA", "BC");
        KeyFactory          f = KeyFactory.getInstance("ECDSA", "BC");
        PrivateKey          sKey = f.generatePrivate(priKey);
        PublicKey           vKey = f.generatePublic(pubKey);


        byte[] message = "abc".getBytes();
        byte[] sig = Hex.decode("3040021e2cb7f36803ebb9c427c58d8265f11fc5084747133078fc279de874fbecb0021e64cb19604be06c57e761b3de5518f71de0f6e0cd2df677cec8a6ffcb690d");


        checkMessage(sgr, sKey, vKey, message, sig);

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            params);
    
        Signature   sgr = Signature.getInstance("ECDSA", "BC");
        KeyFactory  f = KeyFactory.getInstance("ECDSA", "BC");
        PrivateKey  sKey = f.generatePrivate(priKeySpec);
        PublicKey   vKey = f.generatePublic(pubKeySpec);
        byte[]      message = new byte[] { (byte)'a', (byte)'b', (byte)'c' };
       
        sgr.initSign(sKey, k);


        sgr.update(message);

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            params);


        Signature   sgr = Signature.getInstance(algorithm, "BC");
        KeyFactory  f = KeyFactory.getInstance("ECDSA", "BC");
        PrivateKey  sKey = f.generatePrivate(priKeySpec);
        PublicKey   vKey = f.generatePublic(pubKeySpec);
        byte[]      message = new byte[] { (byte)'a', (byte)'b', (byte)'c' };


        sgr.initSign(sKey, k);


        sgr.update(message);

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    byte[] publicByte = Base64.decode(keyValue);
    EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicByte);


    KeyFactory keyFactory = KeyFactory.getInstance(idAlg);


    return keyFactory.generatePublic(publicKeySpec);
  }


  public String getIdHash() {
    return idHash;
  }

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            String keyAlg = getString();
            if (KeyPairProvider.SSH_RSA.equals(keyAlg)) {
                BigInteger e = getMPInt();
                BigInteger n = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
                key = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
            } else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
                BigInteger p = getMPInt();
                BigInteger q = getMPInt();
                BigInteger g = getMPInt();
                BigInteger y = getMPInt();

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