[TOC] ### crypto 加密实例代码 ``` "use strict"; //引用crypto模块 const crypto = require("crypto"); //-------------MD5 可以任意多次调用update(),update()默认字符串编码是UTF-8 const hash = crypto.createHash("md5"); hash.update("hello, world!"); console.log(hash.digest("hex")); //--------------SHA1 const sha1 = crypto.createHash("sha1"); sha1.update("hello,world!"); console.log(sha1.digest("hex")); //-------------SHA256 const sha256 = crypto.createHash("sha256"); sha256.update("hello,world!"); console.log(sha256.digest("hex")); //------------SHA512 const sha512 = crypto.createHash("sha512"); sha512.update("hello,world!"); console.log(sha512.digest("hex")); //------------Hmac const hmac = crypto.createHash("sha256","secret-key"); hmac.update("hello world!"); console.log(hmac.digest("hex")); //-----------AES function aesEncrypt(data, key) { const cipher = crypto.createCipher("aes192", key); var crypted = cipher.update(data, "utf8", "hex"); crypted += cipher.final("hex"); return crypted; } function aesDecrypt(encrypted, key) { const decipher = crypto.createDecipher("aes192", key); var decrypted = decipher.update(encrypted, "hex", "utf8"); decrypted += decipher.final("utf8"); return decrypted; } var data = "hello this a secret message!"; var key = "password"; var encrypted = aesEncrypt(data,key); var decrypted = aesDecrypt(encrypted, key); console.log("plain text:" + data); console.log("Encrypted text:" +encrypted); console.log(("Decrypted text:" + decrypted)); //------------------diffie-hellman var ming = crypto.createDiffieHellman(512); var ming_keys = ming.generateKeys(); var prime = ming.getPrime(); var generator = ming.getGenerator(); console.log("Prime:" + prime.toString("hex")); console.log("Generator:" + generator.toString("hex") ); var hong = crypto.createDiffieHellman(prime, generator); var hong_keys = hong.generateKeys(); var ming_secret = ming.computeSecret(hong_keys); var hong_secret = hong.computeSecret(ming_keys); console.log("Secret of xiao ming:" + ming_secret.toString("hex")); console.log("Secret of xiao hong:" + hong_secret.toString("hex")); //----------RSA const fs = require("fs"); //从文件加载key function loadKey(file) { return fs.readFileSync(file,"utf8"); }; let prvKey = loadKey("./rsa-prv.pem"); let pubKey = loadKey("./rsa-pub.pem"); let message = "hello world!"; //使用私钥加密公钥解密 let enc_by_prv = crypto.privateEncrypt(prvKey,Buffer.from(message,"utf8")); console.log("encrypted by private key:" + enc_by_prv.toString("hex")); let dec_by_pub = crypto.publicDecrypt(pubKey, enc_by_prv); console.log("decrypted by public key:" + dec_by_pub.toString("utf8")); //使用公钥进行加密私钥解密 let enc_by_pub = crypto.publicEncrypt(pubKey,Buffer.from(message,"utf8")); console.log("encrypted by public key:" + enc_by_pub.toString("hex")); let dec_by_prv = crypto.privateDecrypt(prvKey,enc_by_pub); console.log("decrypted by private key:" + dec_by_prv.toString("utf8")); ```