java 11 实现RFC7539中指定的ChaCha20和Poly1305两种加密算法, 代替RC4

实现 RFC 7539的ChaCha20 and ChaCha20-Poly1305加密算法

RFC7748定义的秘钥协商方案更高效, 更安全. JDK增加两个新的接口

XECPublicKey 和 XECPrivateKey

KeyPairGenerator kpg = KeyPairGenerator.getInstance(“XDH”);

NamedParameterSpec paramSpec = new NamedParameterSpec(“X25519”);

kpg.initialize(paramSpec);

KeyPair kp = kgp.generateKeyPair();

KeyFactory kf = KeyFactory.getInstance(“XDH”);

BigInteger u = new BigInteger(“xxx”);

XECPublicKeySpec pubSpec = new XECPublicKeySpec(paramSpec, u);

PublicKey pubKey = kf.generatePublic(pubSpec);

KeyAgreement ka = KeyAgreement.getInstance(“XDH”);

ka.init(kp.getPrivate());

ka.doPhase(pubKey, true);

byte[] secret = ka.generateSecret();