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node_modules/crypto-es/lib/evpkdf.js

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+import {
+  Base,
+  WordArray,
+} from './core.js';
+import { MD5Algo } from './md5.js';
+
+/**
+ * This key derivation function is meant to conform with EVP_BytesToKey.
+ * www.openssl.org/docs/crypto/EVP_BytesToKey.html
+ */
+export class EvpKDFAlgo extends Base {
+  /**
+   * Initializes a newly created key derivation function.
+   *
+   * @param {Object} cfg (Optional) The configuration options to use for the derivation.
+   *
+   * @example
+   *
+   *     const kdf = CryptoJS.algo.EvpKDF.create();
+   *     const kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8 });
+   *     const kdf = CryptoJS.algo.EvpKDF.create({ keySize: 8, iterations: 1000 });
+   */
+  constructor(cfg) {
+    super();
+
+    /**
+     * Configuration options.
+     *
+     * @property {number} keySize The key size in words to generate. Default: 4 (128 bits)
+     * @property {Hasher} hasher The hash algorithm to use. Default: MD5
+     * @property {number} iterations The number of iterations to perform. Default: 1
+     */
+    this.cfg = Object.assign(
+      new Base(),
+      {
+        keySize: 128 / 32,
+        hasher: MD5Algo,
+        iterations: 1,
+      },
+      cfg,
+    );
+  }
+
+  /**
+   * Derives a key from a password.
+   *
+   * @param {WordArray|string} password The password.
+   * @param {WordArray|string} salt A salt.
+   *
+   * @return {WordArray} The derived key.
+   *
+   * @example
+   *
+   *     const key = kdf.compute(password, salt);
+   */
+  compute(password, salt) {
+    let block;
+
+    // Shortcut
+    const { cfg } = this;
+
+    // Init hasher
+    const hasher = cfg.hasher.create();
+
+    // Initial values
+    const derivedKey = WordArray.create();
+
+    // Shortcuts
+    const derivedKeyWords = derivedKey.words;
+    const { keySize, iterations } = cfg;
+
+    // Generate key
+    while (derivedKeyWords.length < keySize) {
+      if (block) {
+        hasher.update(block);
+      }
+      block = hasher.update(password).finalize(salt);
+      hasher.reset();
+
+      // Iterations
+      for (let i = 1; i < iterations; i += 1) {
+        block = hasher.finalize(block);
+        hasher.reset();
+      }
+
+      derivedKey.concat(block);
+    }
+    derivedKey.sigBytes = keySize * 4;
+
+    return derivedKey;
+  }
+}
+
+/**
+ * Derives a key from a password.
+ *
+ * @param {WordArray|string} password The password.
+ * @param {WordArray|string} salt A salt.
+ * @param {Object} cfg (Optional) The configuration options to use for this computation.
+ *
+ * @return {WordArray} The derived key.
+ *
+ * @static
+ *
+ * @example
+ *
+ *     var key = CryptoJS.EvpKDF(password, salt);
+ *     var key = CryptoJS.EvpKDF(password, salt, { keySize: 8 });
+ *     var key = CryptoJS.EvpKDF(password, salt, { keySize: 8, iterations: 1000 });
+ */
+export const EvpKDF = (password, salt, cfg) => EvpKDFAlgo.create(cfg).compute(password, salt);