feat: cryptojs sample

package.json

@@ -49,6 +49,7 @@
     "babel-plugin-module-resolver": "^3.1.0",
     "coveralls": "^3.0.0",
     "create-hmac": "^1.1.4",
+    "crypto-js": "^3.1.9-1",
     "dtslint": "^0.3.0",
     "eslint": "^5.0.0",
     "eslint-config-prettier": "^3.0.0",

packages/otplib-cryptojs/crypto.js

@@ -0,0 +1,48 @@
+import CryptoJS from 'crypto-js';
+
+/**
+ * Crypto replacement using crypto-js
+ *
+ * @module otplib-cryptojs/crypto
+ */
+class CryptoExpo {
+  constructor(algorithm, secret) {
+    this.algorithm = algorithm.toLowerCase();
+    this.secret = secret.toString('ascii');
+  }
+
+  static createHmac(algorithm, hmacSecret) {
+    return new CryptoExpo(algorithm, hmacSecret);
+  }
+
+  update(bufferHex) {
+    this.hex = bufferHex.toString('hex');
+    return this;
+  }
+
+  getEncoder() {
+    switch (this.algorithm) {
+      case 'sha1':
+        return CryptoJS.HmacSHA1;
+      case 'sha256':
+        return CryptoJS.HmacSHA256;
+      case 'sha512':
+        return CryptoJS.HmacSHA512;
+      default:
+        throw new Error(
+          `Unsupported algorithm ${
+            this.algorithm
+          }. Accepts: sha1, sha256, sha512`
+        );
+    }
+  }
+
+  digest() {
+    const encoder = this.getEncoder();
+    const message = CryptoJS.enc.Hex.parse(this.hex);
+    const strDigest = String(encoder(message, this.secret));
+    return Buffer.from(strDigest, 'hex');
+  }
+}
+
+export default CryptoExpo;

packages/otplib-cryptojs/index.js

@@ -0,0 +1,26 @@
+import hotp from 'otplib-hotp';
+import totp from 'otplib-totp';
+import authenticator from 'otplib-authenticator';
+import crypto from './crypto';
+
+/**
+ * otplib
+ *
+ * One-Time Password Library
+ *
+ * ```js
+ * {
+ *    authenticator // instance
+ *    hotp // instance
+ *    totp // instance
+ * }
+ * ```
+ *
+ * @module otplib
+ * @since 3.0.0
+ */
+authenticator.defaultOptions = { crypto };
+hotp.defaultOptions = { crypto };
+totp.defaultOptions = { crypto };
+
+export { authenticator, hotp, totp };

packages/otplib-cryptojs/index.spec.js

@@ -0,0 +1,17 @@
+import * as otplib from './index';
+import rfc6238 from 'tests/rfc6238';
+
+describe('index', () => {
+  rfc6238.table.forEach(row => {
+    const id = `${row.algorithm} / ${row.epoch}`;
+    test(`[${id}] otplib.totp`, () => {
+      otplib.totp.options = {
+        epoch: row.epoch,
+        algorithm: row.algorithm,
+        digits: 8
+      };
+
+      expect(otplib.totp.check(row.token, rfc6238.secret)).toBe(true);
+    });
+  });
+});