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1'use strict';
2const crypto = require('crypto');
3
4class aes_crypto {
5    constructor(secret_key) {
6        this.IV_LENGTH = 16; //  AES = 16 bytes
7        if(secret_key.length !== 32)
8            throw new Error('aes_crypto error param init secret_key.length !== 32');
9        this.ENCRYPTION_KEY = secret_key;
10        this.algoritm = 'aes-256-cbc';
11    }
12
13    encrypt(text) {
14        let iv = crypto.randomBytes(this.IV_LENGTH);
15        let cipher = crypto.createCipheriv(this.algoritm, Buffer.from(this.ENCRYPTION_KEY), iv);
16        let encrypted = Buffer.concat([cipher.update(text), cipher.final()]);
17
18        return iv.toString('hex') + ':' + encrypted.toString('hex');
19    }
20
21    decrypt(text) {
22        let textParts = text.split(':');
23        let iv = new Buffer(textParts.shift(), 'hex');
24        let encryptedText = Buffer.from(textParts.join(':'), 'hex');
25        let decipher = crypto.createDecipheriv(this.algoritm, Buffer.from(this.ENCRYPTION_KEY), iv);
26        let decrypted = decipher.update(encryptedText);
27        decrypted = Buffer.concat([decrypted, decipher.final()]);
28        return decrypted.toString();
29    }
30}
31
32
33module.exports = aes_crypto;