64 lines
1.9 KiB
TypeScript
64 lines
1.9 KiB
TypeScript
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import { CHALLENGE_SECRET } from '$env/static/private';
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import * as crypto from 'crypto';
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import { v4 } from 'uuid';
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const IV_LENGTH = 16;
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const ALGORITHM = 'aes-256-cbc';
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export class CryptoUtils {
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public static generateString(length: number): string {
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return crypto.randomBytes(length).toString('hex').slice(0, length);
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}
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public static generateSecret(): string {
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return crypto.randomBytes(256 / 8).toString('hex');
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}
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public static insecureHash(input: string): string {
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return crypto.createHash('md5').update(input).digest('hex');
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}
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public static createUUID(): string {
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return v4();
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}
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// https://stackoverflow.com/q/52212430
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/**
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* Symmetric encryption function
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* @param text String to encrypt
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* @param key Encryption key
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* @returns Encrypted text
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*/
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public static encrypt(text: string, key: string): string {
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const iv = crypto.randomBytes(IV_LENGTH);
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const cipher = crypto.createCipheriv(ALGORITHM, Buffer.from(key, 'hex'), iv);
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let encrypted = cipher.update(text);
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encrypted = Buffer.concat([encrypted, cipher.final()]);
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return `${iv.toString('hex')}:${encrypted.toString('hex')}`;
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}
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/**
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* Symmetric decryption function
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* @param text Encrypted string
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* @param key Decryption key
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* @returns Decrypted text
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*/
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public static decrypt(text: string, key: string): string {
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const [iv, encryptedText] = text.split(':').map((part) => Buffer.from(part, 'hex'));
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const decipher = crypto.createDecipheriv(ALGORITHM, Buffer.from(key, 'hex'), iv);
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let decrypted = decipher.update(encryptedText);
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decrypted = Buffer.concat([decrypted, decipher.final()]);
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return decrypted.toString();
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}
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public static async encryptChallenge<T>(challenge: T): Promise<string> {
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return this.encrypt(JSON.stringify(challenge), CHALLENGE_SECRET);
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}
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public static async decryptChallenge<T>(challenge: string): Promise<T> {
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return JSON.parse(this.decrypt(challenge, CHALLENGE_SECRET));
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}
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}
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