Examples of 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.

Examples of javax.crypto.KeyAgreement

      X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(
          peerPublicKeyBytes);
      KeyFactory keyFact = KeyFactory.getInstance(ALGORITHM);
      PublicKey publicKey = keyFact.generatePublic(x509KeySpec);


      KeyAgreement ka = KeyAgreement.getInstance(ALGORITHM);
      ka.init(privateKey);
      ka.doPhase(publicKey, true);
      byte[] secret = ka.generateSecret();


      MessageDigest sha = MessageDigest.getInstance(DIGEST);
      byte[] hash = sha.digest(secret);
      byte[] symKey = new byte[keySize / 8];
      System.arraycopy(hash, 0, symKey, 0, symKey.length);

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Examples of javax.crypto.KeyAgreement


            // send a half and get a half
            writeKey(keyPair.getPublic());
        }


        KeyAgreement ka = KeyAgreement.getInstance("DH");
        ka.init(keyPair.getPrivate());
        ka.doPhase(otherHalf, true);


        return ka;
    }

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Examples of javax.crypto.KeyAgreement

     * 
     * **THE OUTPUT SHOULD ALWAYS GO THROUGH A KDF**
     */
    public byte[] getAgreedSecret(ECPublicKey pubkey) {
        try {
            KeyAgreement ka = null;
            ka = KeyAgreement.getInstance("ECDH", curve.kaProvider);
            ka.init(key.getPrivate());
            ka.doPhase(pubkey, true);


            return ka.generateSecret();
        } catch (InvalidKeyException e) {
            Logger.error(this, "InvalidKeyException : "+e.getMessage(),e);
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            Logger.error(this, "NoSuchAlgorithmException : "+e.getMessage(),e);

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Examples of javax.crypto.KeyAgreement


        KeyPairGenerator cPairGen = KeyPairGenerator.getInstance(algName, "BC");
        cPairGen.initialize(spec);
        KeyPair cPair = cPairGen.generateKeyPair();


        KeyAgreement aKeyAgree = KeyAgreement.getInstance(algName, "BC");
        aKeyAgree.init(aPair.getPrivate());


        KeyAgreement bKeyAgree = KeyAgreement.getInstance(algName, "BC");
        bKeyAgree.init(bPair.getPrivate());


        KeyAgreement cKeyAgree = KeyAgreement.getInstance(algName, "BC");
        cKeyAgree.init(cPair.getPrivate());


        Key ac = aKeyAgree.doPhase(cPair.getPublic(), false);


        Key ba = bKeyAgree.doPhase(aPair.getPublic(), false);


        Key cb = cKeyAgree.doPhase(bPair.getPublic(), false);


        aKeyAgree.doPhase(cb, true);


        bKeyAgree.doPhase(ac, true);


        cKeyAgree.doPhase(ba, true);


        BigInteger aShared = new BigInteger(aKeyAgree.generateSecret());
        BigInteger bShared = new BigInteger(bKeyAgree.generateSecret());
        BigInteger cShared = new BigInteger(cKeyAgree.generateSecret());


        if (!aShared.equals(bShared))
        {
            fail(size + " bit 3-way test failed (a and b differ)");
        }

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Examples of javax.crypto.KeyAgreement

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


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


        checkKeySize(privateValueSize, aKeyPair);


        aKeyAgree.init(aKeyPair.getPrivate());


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


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


        checkKeySize(privateValueSize, bKeyPair);


        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(size + " bit 2-way test failed");
        }

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Examples of javax.crypto.KeyAgreement

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


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


        checkKeySize(privateValueSize, aKeyPair);


        aKeyAgree.init(aKeyPair.getPrivate());


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


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


        checkKeySize(privateValueSize, bKeyPair);


        bKeyAgree.init(bKeyPair.getPrivate());


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


        SecretKey k1 = aKeyAgree.generateSecret(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId());
        SecretKey k2 = bKeyAgree.generateSecret(PKCSObjectIdentifiers.id_alg_CMS3DESwrap.getId());
        
        // TODO Compare k1 and k2?
    }

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Examples of javax.crypto.KeyAgreement


        KeyPairGenerator cPairGen = KeyPairGenerator.getInstance(algName, "BC");
        cPairGen.initialize(spec);
        KeyPair cPair = cPairGen.generateKeyPair();


        KeyAgreement aKeyAgree = KeyAgreement.getInstance(algName, "BC");
        aKeyAgree.init(aPair.getPrivate());


        KeyAgreement bKeyAgree = KeyAgreement.getInstance(algName, "BC");
        bKeyAgree.init(bPair.getPrivate());


        KeyAgreement cKeyAgree = KeyAgreement.getInstance(algName, "BC");
        cKeyAgree.init(cPair.getPrivate());


        Key ac = aKeyAgree.doPhase(cPair.getPublic(), false);


        Key ba = bKeyAgree.doPhase(aPair.getPublic(), false);


        Key cb = cKeyAgree.doPhase(bPair.getPublic(), false);


        aKeyAgree.doPhase(cb, true);


        bKeyAgree.doPhase(ac, true);


        cKeyAgree.doPhase(ba, true);


        BigInteger aShared = new BigInteger(aKeyAgree.generateSecret());
        BigInteger bShared = new BigInteger(bKeyAgree.generateSecret());
        BigInteger cShared = new BigInteger(cKeyAgree.generateSecret());


        if (!aShared.equals(bShared))
        {
            fail(size + " bit 3-way test failed (a and b differ)");
        }

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Examples of javax.crypto.KeyAgreement

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


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


        aKeyAgree.init(aKeyPair.getPrivate());


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


        KeyAgreement bKeyAgree = KeyAgreement.getInstance(algorithm, "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(algorithm + " 2-way test failed");
        }

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Examples of javax.crypto.KeyAgreement


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


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

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Examples of javax.crypto.KeyAgreement


        keyGen.initialize(dhParams);


        KeyPair kp = keyGen.generateKeyPair();


        KeyAgreement keyAgreement = KeyAgreement.getInstance("DH", "BC");


        keyAgreement.init(kp.getPrivate());
        keyAgreement.doPhase(kp.getPublic(), true);


        SecretKey key = keyAgreement.generateSecret("DES");


        if (key.getEncoded().length != 8)
        {
            fail("DES length wrong");
        }


        if (!DESKeySpec.isParityAdjusted(key.getEncoded(), 0))
        {
            fail("DES parity wrong");
        }


        key = keyAgreement.generateSecret("DESEDE");


        if (key.getEncoded().length != 24)
        {
            fail("DESEDE length wrong");
        }


        if (!DESedeKeySpec.isParityAdjusted(key.getEncoded(), 0))
        {
            fail("DESEDE parity wrong");
        }


        key = keyAgreement.generateSecret("Blowfish");


        if (key.getEncoded().length != 16)
        {
            fail("Blowfish length wrong");
        }

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