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.

            BigInteger p = bar.readBigInteger();
            RSAPrivateKeySpec prvSpec = new RSAPrivateKeySpec(n, p);
            RSAPublicKeySpec pubSpec = new RSAPublicKeySpec(n, e);
            KeyFactory kf = KeyFactory.getInstance("RSA");
            prvKey = (RSAPrivateKey) kf.generatePrivate(prvSpec);
            pubKey = (RSAPublicKey) kf.generatePublic(pubSpec);
        } catch (Exception e) {
            throw new InvalidKeyException();
        }
    }

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            BigInteger y = bar.readBigInteger();
            dsaKey = new DSAPublicKeySpec(y, p, q, g);


            KeyFactory kf = KeyFactory.getInstance("DSA");
            
            pubkey = (DSAPublicKey) kf.generatePublic(dsaKey);
        } catch (Exception e) {
            throw new InvalidKeyException();
        }
    }

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            DSAPublicKeySpec spec = new DSAPublicKeySpec(getY(),
                    prvkey.getParams().getP(), prvkey.getParams().getQ(),
                    prvkey.getParams().getG());
            KeyFactory kf = KeyFactory.getInstance("DSA");


            return new SshDssPublicKey((DSAPublicKey) kf.generatePublic(spec));
        } catch (Exception e) {
            return null;
        }
    }

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            X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(encKey);
            
            KeyFactory keyFactory = KeyFactory.getInstance(
                    SOSKeyGenerator.keyAlgorithmName, SOSKeyGenerator.provider);
            
            pubKey = keyFactory.generatePublic(pubKeySpec);


        } catch (NoClassDefFoundError e) {
            throw new Exception("no such Definition : " + e);
        } catch (IOException e) {
            throw new Exception("Public Key File " + keyFile + " not found : "

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  protected static byte[] getSharedSecret(byte[] otherPublicKeyBytes, KeyAgreement agreement) {
    BigInteger otherPublicKeyInt = new BigInteger(1, otherPublicKeyBytes);
    try {
      KeyFactory keyFactory = KeyFactory.getInstance("DH");
      KeySpec otherPublicKeySpec = new DHPublicKeySpec(otherPublicKeyInt, RTMPHandshake.DH_MODULUS, RTMPHandshake.DH_BASE);
      PublicKey otherPublicKey = keyFactory.generatePublic(otherPublicKeySpec);
      agreement.doPhase(otherPublicKey, true);
    } catch (Exception e) {
      JFLog.log("Exception getting the shared secret", e);
    }
    byte[] sharedSecret = agreement.generateSecret();

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            kspec = new RSAPublicKeySpec(new BigInteger(RSA_MOD), 
                    new BigInteger(RSA_PUB));
        } else {
            throw new RuntimeException("Unsupported key algorithm " + algo);
        }
        return kf.generatePublic(kspec);
    }


    private void checkSignatureToken(
        TestSecurityEventListener securityEventListener,
        Key key,

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    private PublicKey loadPublicKey(String filePath, String algorithm) throws Exception {
        String fileData = new String(JavaUtils.getBytesFromFile(getControlFilePath(filePath)));
        byte[] keyBytes = Base64.decode(fileData);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        return kf.generatePublic(keySpec);
    }


    private X509Certificate loadCertificate(String fileName) throws Exception {
        FileInputStream fis = new FileInputStream(getControlFilePath(fileName));
        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");

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    private PublicKey loadPublicKey(String filePath, String algorithm) throws Exception {
        String fileData = new String(JavaUtils.getBytesFromFile(getControlFilePath(filePath)));
        byte[] keyBytes = Base64.decode(fileData);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        return kf.generatePublic(keySpec);
    }


}

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     */
    public static PublicKey getPublicKeyObject(SubjectPublicKeyInfo pubKeyInfo) throws Exception{
        RSAPublicKeyStructure pubkeyStruct = new RSAPublicKeyStructure((ASN1Sequence)pubKeyInfo.getPublicKey());
        RSAPublicKeySpec pubkeySpec = new RSAPublicKeySpec(pubkeyStruct.getModulus(), pubkeyStruct.getPublicExponent());
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey pubKey = keyFactory.generatePublic(pubkeySpec);
        return pubKey;
    }
    
    /**
     * This method returns a X509Name object corresponding to the subject in a given certificate

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            com.trilead.ssh2.signature.DSAPrivateKey x = (com.trilead.ssh2.signature.DSAPrivateKey)key;
            KeyFactory kf = KeyFactory.getInstance("DSA");
//            System.out.println("ssh-dsa " + new String(Base64.encode(DSASHA1Verify.encodeSSHDSAPublicKey(x.getPublicKey()))));


            return new KeyPair(
                    kf.generatePublic(new DSAPublicKeySpec(x.getY(), x.getP(), x.getQ(), x.getG())),
                    kf.generatePrivate(new DSAPrivateKeySpec(x.getX(), x.getP(), x.getQ(), x.getG())));
        }


        throw new UnsupportedOperationException("Unrecognizable key format: "+key);
    }

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