ESM: Ported Punycode, HTTP and PRNG operations

src/core/operations/PseudoRandomNumberGenerator.mjs

@@ -0,0 +1,80 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Utils from "../Utils";
+import forge from "node-forge/dist/forge.min.js";
+import BigNumber from "bignumber.js";
+
+/**
+ * Pseudo-Random Number Generator operation
+ */
+class PseudoRandomNumberGenerator extends Operation {
+
+    /**
+     * PseudoRandomNumberGenerator constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Pseudo-Random Number Generator";
+        this.module = "Ciphers";
+        this.description = "A cryptographically-secure pseudo-random number generator (PRNG).<br><br>This operation uses the browser's built-in <code>crypto.getRandomValues()</code> method if available. If this cannot be found, it falls back to a Fortuna-based PRNG algorithm.";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Number of bytes",
+                "type": "number",
+                "value": 32
+            },
+            {
+                "name": "Output as",
+                "type": "option",
+                "value": ["Hex", "Integer", "Byte array", "Raw"]
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [numBytes, outputAs] = args;
+
+        let bytes;
+
+        if (ENVIRONMENT_IS_WORKER() && self.crypto) {
+            bytes = self.crypto.getRandomValues(new Uint8Array(numBytes));
+            bytes = Utils.arrayBufferToStr(bytes.buffer);
+        } else {
+            bytes = forge.random.getBytesSync(numBytes);
+        }
+
+        let value = new BigNumber(0),
+            i;
+
+        switch (outputAs) {
+            case "Hex":
+                return forge.util.bytesToHex(bytes);
+            case "Integer":
+                for (i = bytes.length - 1; i >= 0; i--) {
+                    value = value.times(256).plus(bytes.charCodeAt(i));
+                }
+                return value.toFixed();
+            case "Byte array":
+                return JSON.stringify(Utils.strToCharcode(bytes));
+            case "Raw":
+            default:
+                return bytes;
+        }
+    }
+
+}
+
+export default PseudoRandomNumberGenerator;