random-encrypt
Version:
encrypt base openssl
206 lines (199 loc) • 7.72 kB
JavaScript
;
let CryptoJS = require('crypto-js');
let md5 = require('js-md5');
let RandomEncrypt = {
tool: function (config) {
this.timezone = -480;
this.timeInterval = 5;
this.keyLength = 16;
this.secondRedundancy = 2;
this.salt = "";
this.timestamp = 0;
this.map = {
"1": '#',
"2": '0',
"3": '*',
"4": '9',
"5": '8',
"6": '7',
"7": '6',
"8": '5',
"9": '4',
"*": '3',
"0": '2',
"#": '1',
};
// 获取当前时间戳
this.getTimezoneTimestamp = function (timestamp = 0) {
return Date.now();
};
this.getTimeGroup = function (time) {
return Math.ceil(Math.floor(time / 1000) / this.timeInterval) * this.timeInterval * 1000;
};
// 加密
this.encrypt = function (str) {
let keyArr = this.key();
// console.log("加密：key:", JSON.stringify(keyArr));
let key = CryptoJS.enc.Utf8.parse(keyArr[0]);
let iv = CryptoJS.enc.Utf8.parse(keyArr[1]);
let encrypted = CryptoJS.AES.encrypt(str, key, {
iv: iv,
mode: CryptoJS.mode.CBC,
padding: CryptoJS.pad.Pkcs7
});
return [encrypted.toString(), ...keyArr, this.timestamp];
};
this.decryptByKeyIv = function (str, key, iv) {
key = CryptoJS.enc.Utf8.parse(key);
iv = CryptoJS.enc.Utf8.parse(iv);
let decrypted = CryptoJS.AES.decrypt(str, key, {iv: iv, padding: CryptoJS.pad.Pkcs7});
return decrypted.toString(CryptoJS.enc.Utf8);
};
this.doDecrypt = function (str, timestamp) {
// console.log("解密：timestamp: ", timestamp);
let keyArr = this.key(timestamp);
// console.log("解密：key:", JSON.stringify(keyArr));
let key = CryptoJS.enc.Utf8.parse(keyArr[0]);
let iv = CryptoJS.enc.Utf8.parse(keyArr[1]);
try {
let decrypted = CryptoJS.AES.decrypt(str, key, {iv: iv, padding: CryptoJS.pad.Pkcs7});
return decrypted.toString(CryptoJS.enc.Utf8);
} catch (e) {
console.warn('字符串有问题')
return "";
// let decrypted = CryptoJS.AES.decrypt(JSON.stringify({str}), key, {iv: iv, padding: CryptoJS.pad.Pkcs7});
// console.warn(decrypted);
// return decrypted.toString(CryptoJS.enc.Utf8);
}
};
this.isReDecrypt = function (timestamp) {
return timestamp % this.timeInterval <= this.secondRedundancy
};
// 解密
this.decrypt = function (str) {
let current = this.getTimezoneTimestamp();
let rs = this.doDecrypt(str, current);
if (rs.trim().length === 0 && this.isReDecrypt(current)) {
rs = this.doDecrypt(str, current - this.timeInterval * 1000);
}
return rs;
};
// 获取加/解密key
this.key = function (timestamp = 0) {
if (timestamp === 0) timestamp = this.getTimezoneTimestamp();
this.timestamp = timestamp;
// console.log(time / 1000)
timestamp = this.getTimeGroup(timestamp);
let datetime = this.formatDateTime(timestamp);
// console.log(datetime)
let key = datetime.split("").map(v => this.map[v]).join("");
let index = parseInt(datetime) % this.keyLength;
let passphrase = datetime + key + datetime;
let iv = key + datetime + key;
return [this.getEncryptKey(passphrase, index), this.getEncryptKey(iv, index)];
};
this.formatDateTime = function(timestamp){
let date = new Date();
let zone = date.getTimezoneOffset()
let second = (zone - this.timezone) * 60 * 1000;
timestamp += second;
return this.CurrentTime("YmdHis", timestamp);
};
this.getEncryptKey = function (str, index) {
if (this.salt === "") throw new Error("the salt can not be empty.");
return md5(str + this.salt).substr(index, this.keyLength).toLowerCase();
};
/**
* 获取当前日期 YYYYMMDDhis
* @returns {string}
*/
this.CurrentTime = function (format = 'YmdHis', timestamp = 0) {
let now = null;
if (timestamp > 0) {
now = new Date(timestamp);
} else {
now = new Date();
}
let year = now.getFullYear(); //年
let month = now.getMonth() + 1; //月
let day = now.getDate(); //日
let h = now.getHours(); //时
let i = now.getMinutes(); //分
let s = now.getSeconds(); //秒
if (month < 10) month = "0" + month;
if (day < 10) day = "0" + day;
if (h < 10) h = "0" + h;
if (i < 10) i = '0' + i;
if (s < 10) s = '0' + s;
format = format.replace("Y", year.toString());
format = format.replace("m", month.toString());
format = format.replace("d", day.toString());
format = format.replace("H", h.toString());
format = format.replace("i", i.toString());
format = format.replace("s", s.toString());
return format;
};
/**
* 自定义盐值 加密时不能为空
* @param salt
* @returns this
*/
this.setSalt = function (salt) {
this.salt = salt;
return this;
};
/**
* 自定义对齐时区 默认东八区 8
* @return this
* @param offset
*/
this.setTimezoneOffset = function (offset) {
this.timezone = (0 - parseInt(offset)) * 60;
return this;
};
/**
* 自定义加密key有效时间 默认5秒
* key有效期为 timeInterval + secondRedundancy
* @return this
* @param timeInterval
*/
this.setTimeInterval = function (timeInterval) {
this.timeInterval = timeInterval;
return this;
};
// 返回指定时区的时间
this.getTimezoneDatetime = function (timestamp) {
timestamp = this.getTimezoneTimestamp(timestamp * 1000);
return this.CurrentTime("Y-m-d H:i:s", timestamp);
};
/**
* 自定义跨区间 冗余秒数 默认2秒
* key有效期为 timeInterval + secondRedundancy
* @return this
* @param secondRedundancy
*/
this.setSecondRedundancy = function (secondRedundancy) {
this.secondRedundancy = secondRedundancy;
return this;
};
this.isSet = function(key){
return typeof (config[key]) !== 'undefined';
}
if (this.isSet("salt")) {
this.setSalt(config['salt']);
}
if (this.isSet("offset")) {
this.setTimezoneOffset(parseInt(config['offset']));
}
if (this.isSet("timeInterval")) {
this.setTimeInterval(parseInt(config['timeInterval']));
}
if (this.isSet("undefined")) {
this.setSecondRedundancy(parseInt(config['secondRedundancy']));
}
},
init: function (config) {
return new this.tool(config);
}
};
module.exports = RandomEncrypt;