From 8ba2680510233be00f8e44baf3cfe8a61413b01b Mon Sep 17 00:00:00 2001
From: KOSASIH <kosasihg88@gmail.com>
Date: Fri, 9 Aug 2024 09:10:36 +0700
Subject: [PATCH] Create crypto.ts

---
 projects/pi-nexus-iam/utils/crypto.ts | 90 +++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 projects/pi-nexus-iam/utils/crypto.ts

diff --git a/projects/pi-nexus-iam/utils/crypto.ts b/projects/pi-nexus-iam/utils/crypto.ts
new file mode 100644
index 000000000..906f5daff
--- /dev/null
+++ b/projects/pi-nexus-iam/utils/crypto.ts
@@ -0,0 +1,90 @@
+import * as bcrypt from 'bcrypt';
+import * as crypto from 'crypto';
+import * as elliptic from 'elliptic';
+import * as scrypt from 'scrypt-js';
+import { randomBytes } from 'crypto';
+import { promisify } from 'util';
+
+const ec = new elliptic.ec('secp256k1');
+
+interface HashOptions {
+  saltRounds?: number;
+  pepper?: string;
+}
+
+interface EncryptOptions {
+  algorithm?: string;
+  password?: string;
+  salt?: string;
+  iv?: string;
+}
+
+interface DecryptOptions {
+  algorithm?: string;
+  password?: string;
+  salt?: string;
+  iv?: string;
+}
+
+class Crypto {
+  private static async generateSalt(): Promise<string> {
+    return promisify(crypto.randomBytes)(16).then((buf) => buf.toString('hex'));
+  }
+
+  private static async generatePepper(): Promise<string> {
+    return promisify(crypto.randomBytes)(16).then((buf) => buf.toString('hex'));
+  }
+
+  static async hash(password: string, options: HashOptions = {}): Promise<string> {
+    const saltRounds = options.saltRounds || 10;
+    const pepper = options.pepper || await this.generatePepper();
+    const salt = await this.generateSalt();
+    const hash = await bcrypt.hash(password + pepper, saltRounds);
+    return `${salt}:${hash}`;
+  }
+
+  static async verify(password: string, hash: string): Promise<boolean> {
+    const [salt, storedHash] = hash.split(':');
+    const pepper = await this.generatePepper();
+    const hashedPassword = await bcrypt.hash(password + pepper, parseInt(salt, 10));
+    return hashedPassword === storedHash;
+  }
+
+  static async encrypt(data: string, options: EncryptOptions = {}): Promise<string> {
+    const algorithm = options.algorithm || 'aes-256-cbc';
+    const password = options.password || randomBytes(32).toString('hex');
+    const salt = options.salt || await this.generateSalt();
+    const iv = options.iv || randomBytes(16).toString('hex');
+    const cipher = crypto.createCipheriv(algorithm, password, iv);
+    let encrypted = cipher.update(data, 'utf8', 'hex');
+    encrypted += cipher.final('hex');
+    return `${salt}:${iv}:${encrypted}`;
+  }
+
+  static async decrypt(encrypted: string, options: DecryptOptions = {}): Promise<string> {
+    const [salt, iv, encryptedData] = encrypted.split(':');
+    const algorithm = options.algorithm || 'aes-256-cbc';
+    const password = options.password || randomBytes(32).toString('hex');
+    const decipher = crypto.createDecipheriv(algorithm, password, iv);
+    let decrypted = decipher.update(encryptedData, 'hex', 'utf8');
+    decrypted += decipher.final('utf8');
+    return decrypted;
+  }
+
+  static async sign(data: string, privateKey: string): Promise<string> {
+    const key = ec.keyFromPrivate(privateKey, 'hex');
+    const signature = key.sign(data);
+    return signature.toDER('hex');
+  }
+
+  static async verifySignature(data: string, signature: string, publicKey: string): Promise<boolean> {
+    const key = ec.keyFromPublic(publicKey, 'hex');
+    return key.verify(data, signature);
+  }
+
+  static async scrypt(password: string, salt: string, N: number, r: number, p: number): Promise<string> {
+    return scrypt.scrypt(password, salt, N, r, p);
+  }
+}
+
+export default Crypto;