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();