Java 类org.bouncycastle.crypto.params.IESWithCipherParameters 实例源码

public static byte[] decryptMessage(PrivateKey key, ECIESMessage message) throws ECIESException {

        try {

            // check key algorithm
            if (!key.getAlgorithm().equals(ASYMMETRIC_ALGORITHM))
                throw new ECIESException("Wrong key algorithm");

            // IES engine
            IESEngine ies = getIESEngine();

            // initialize engine
            Curve25519DecryptionParameter ep = new Curve25519DecryptionParameter(key.getEncoded(), message.getR());
            ParametersWithIV p = new ParametersWithIV(new IESWithCipherParameters(message.getSh1(), message.getSh2(), MAC_KEY_SIZE_BITS, AES_KEY_SIZE_BITS), message.getIv());
            ies.init(false, null, ep, p);

            // decrypt and return data
            return ies.processBlock(message.getCd(), 0, message.getCd().length);

        } catch (InvalidCipherTextException ex) {

            throw new ECIESException("Message corrupted or wrong key", ex);
        }
    }

private static ECIESMessage encryptData(PublicKey key, byte[] data, boolean binary, SecureRandom random) throws ECIESException {

        try {

            // check key algorithm
            if (!key.getAlgorithm().equals(ASYMMETRIC_ALGORITHM))
                throw new ECIESException("Wrong key algorithm");

            // generate shared information
            byte[] sh1 = new byte[SHARED_INFORMATION_SIZE_BYTES];
            random.nextBytes(sh1);
            byte[] sh2 = new byte[SHARED_INFORMATION_SIZE_BYTES];
            random.nextBytes(sh2);
            byte[] iv = new byte[IV_SIZE_BYTES];
            random.nextBytes(iv);

            // generate R
            byte[] r = new byte[Curve25519.KEY_SIZE];
            random.nextBytes(r);
            byte[] R = new byte[Curve25519.KEY_SIZE];
            Curve25519.curve(R, r, null);

            // IES engine
            IESEngine ies = getIESEngine();

            // initialize engine
            Curve25519EncryptionParameter ep = new Curve25519EncryptionParameter(key.getEncoded(), r);
            ParametersWithIV p = new ParametersWithIV(new IESWithCipherParameters(sh1, sh2, MAC_KEY_SIZE_BITS, AES_KEY_SIZE_BITS), iv);
            ies.init(true, null, ep, p);

            // encrypt data
            byte[] cd = ies.processBlock(data, 0, data.length);

            // return message
            return new ECIESMessage(sh1, sh2, iv, R, cd, binary);

        } catch (InvalidCipherTextException ex) {

            throw new ECIESException("Message corrupted or wrong key", ex);
        }
    }