import org.bouncycastle.crypto.params.IESWithCipherParameters; //导入依赖的package包/类
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);
		}
	}
 

import org.bouncycastle.crypto.params.IESWithCipherParameters; //导入依赖的package包/类
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);
		}
	}