Examples of javax.crypto.KeyAgreement

javax.crypto.KeyAgreement
This class provides the functionality for a key exchange protocol. This enables two or more parties to agree on a secret key for symmetric cryptography.


    private void testExceptions()
    {
        try
        {
            KeyAgreement aKeyAgree = KeyAgreement.getInstance("DH", "BC");


            aKeyAgree.generateSecret("DES");
        }
        catch (IllegalStateException e)
        {
            // okay
        }

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        //
        // a side
        //
        KeyPair aKeyPair = g.generateKeyPair();


        KeyAgreement aKeyAgree = KeyAgreement.getInstance("ECDHC", "BC");


        aKeyAgree.init(aKeyPair.getPrivate());


        //
        // b side
        //
        KeyPair bKeyPair = g.generateKeyPair();


        KeyAgreement bKeyAgree = KeyAgreement.getInstance("ECDHC", "BC");


        bKeyAgree.init(bKeyPair.getPrivate());


        //
        // agreement
        //
        aKeyAgree.doPhase(bKeyPair.getPublic(), true);
        bKeyAgree.doPhase(aKeyPair.getPublic(), true);


        BigInteger  k1 = new BigInteger(aKeyAgree.generateSecret());
        BigInteger  k2 = new BigInteger(bKeyAgree.generateSecret());


        if (!k1.equals(k2))
        {
            fail("2-way test failed");
        }

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            OriginatorPublicKey origK = _info.getOriginator().getOriginatorKey();
            PrivateKeyInfo privInfo = PrivateKeyInfo.getInstance(ASN1Object.fromByteArray(key.getEncoded()));
            SubjectPublicKeyInfo pubInfo = new SubjectPublicKeyInfo(privInfo.getAlgorithmId(), origK.getPublicKey().getBytes());
            X509EncodedKeySpec pubSpec = new X509EncodedKeySpec(pubInfo.getEncoded());
            KeyFactory fact = KeyFactory.getInstance(_keyEncAlg.getObjectId().getId(), prov);
            KeyAgreement agreement = KeyAgreement.getInstance(_keyEncAlg.getObjectId().getId(), prov);
                            
            agreement.init(key);


            agreement.doPhase(fact.generatePublic(pubSpec), true);


            String wrapAlg = DERObjectIdentifier.getInstance(
                                   ASN1Sequence.getInstance(_keyEncAlg.getParameters()).getObjectAt(0)).getId();


            Key wKey = agreement.generateSecret(wrapAlg);


            Cipher keyCipher = Cipher.getInstance(wrapAlg, prov);


            keyCipher.init(Cipher.UNWRAP_MODE, wKey);

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        X509Certificate  recipientCert,
        String           cekWrapAlgorithm,
        String           provider)
        throws NoSuchProviderException, NoSuchAlgorithmException, InvalidKeyException
    {
        KeyAgreement agreement = KeyAgreement.getInstance(agreementAlgorithm, provider);


        agreement.init(senderPrivateKey, rand);


        agreement.doPhase(recipientCert.getPublicKey(), true);


        try
        {
            SubjectPublicKeyInfo oPubKeyInfo = SubjectPublicKeyInfo.getInstance(ASN1Object.fromByteArray(senderPublicKey.getEncoded()));
            OriginatorIdentifierOrKey originator = new OriginatorIdentifierOrKey(
                                                       new OriginatorPublicKey(
                                                            new AlgorithmIdentifier(oPubKeyInfo.getAlgorithmId().getObjectId(), new DERNull()),
                                                            oPubKeyInfo.getPublicKeyData().getBytes()));


            recipientInfs.add(new RecipientInf(agreement.generateSecret(cekWrapAlgorithm), agreementAlgorithm, cekWrapAlgorithm, originator, recipientCert));
        }
        catch (IOException e)
        {
            throw new InvalidKeyException("cannot extract originator public key: " + e);
        }

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        publicKey = decode(key);
        return this;
    }


    public Key generateSecret() throws NoSuchAlgorithmException, InvalidKeyException {
        KeyAgreement ka = KeyAgreement.getInstance("DH");
        ka.init(keyPair.getPrivate());
        ka.doPhase(publicKey, true);
        return ka.generateSecret("DESede");
    }

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        try {
            KeyFactory kf = JsseJce.getKeyFactory("DiffieHellman");
            DHPublicKeySpec spec =
                        new DHPublicKeySpec(peerPublicValue, modulus, base);
            PublicKey publicKey = kf.generatePublic(spec);
            KeyAgreement ka = JsseJce.getKeyAgreement("DiffieHellman");
            ka.init(privateKey);
            ka.doPhase(publicKey, true);
            return ka.generateSecret("TlsPremasterSecret");
        } catch (GeneralSecurityException e) {
            throw new RuntimeException("Could not generate secret", e);
        }
    }

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    }


    // called by ClientHandshaker with either the server's static or ephemeral public key
    SecretKey getAgreedSecret(PublicKey peerPublicKey) {
        try {
            KeyAgreement ka = JsseJce.getKeyAgreement("ECDH");
            ka.init(privateKey);
            ka.doPhase(peerPublicKey, true);
            return ka.generateSecret("TlsPremasterSecret");
        } catch (GeneralSecurityException e) {
            throw new RuntimeException("Could not generate secret", e);
        }
    }

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        try {
            KeyFactory kf = JsseJce.getKeyFactory("DiffieHellman");
            DHPublicKeySpec spec =
                        new DHPublicKeySpec(peerPublicValue, modulus, base);
            PublicKey publicKey = kf.generatePublic(spec);
            KeyAgreement ka = JsseJce.getKeyAgreement("DiffieHellman");


            // validate the Diffie-Hellman public key
            if (!keyIsValidated &&
                    !KeyUtil.isOracleJCEProvider(ka.getProvider().getName())) {
                try {
                    KeyUtil.validate(spec);
                } catch (InvalidKeyException ike) {
                    // prefer handshake_failure alert to internal_error alert
                    throw new SSLHandshakeException(ike.getMessage());
                }
            }


            ka.init(privateKey);
            ka.doPhase(publicKey, true);
            return ka.generateSecret("TlsPremasterSecret");
        } catch (GeneralSecurityException e) {
            throw new RuntimeException("Could not generate secret", e);
        }
    }

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