socket programming is an used in many project. here is king of socket programming for IO works.

jsrsasign（RSA-Sign Javascr ipt库）是一个免费的开源加密库，支持RSA / RSAPSS / ECDSA / DSA签名/验证，ASN.1，PKCS＃1/5/8私钥/公钥，X.509证书，纯Javascr ipt中的CRL，OCSP，CMS SignedData，TimeStamp，CAdES JSON Web签名/令牌/密钥。 公开页面是https://kjur.github.io/jsrsasign。