ESM: Ported all Hash and Checksum operations

src/core/operations/Adler32Checksum.mjs

@@ -0,0 +1,52 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Utils from "../Utils";
+
+/**
+ * Adler-32 Checksum operation
+ */
+class Adler32Checksum extends Operation {
+
+    /**
+     * Adler32Checksum constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Adler-32 Checksum";
+        this.module = "Hashing";
+        this.description = "Adler-32 is a checksum algorithm which was invented by Mark Adler in 1995, and is a modification of the Fletcher checksum. Compared to a cyclic redundancy check of the same length, it trades reliability for speed (preferring the latter).<br><br>Adler-32 is more reliable than Fletcher-16, and slightly less reliable than Fletcher-32.";
+        this.inputType = "byteArray";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {byteArray} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const MOD_ADLER = 65521;
+        let a = 1,
+            b = 0;
+
+        for (let i = 0; i < input.length; i++) {
+            a += input[i];
+            b += a;
+        }
+
+        a %= MOD_ADLER;
+        b %= MOD_ADLER;
+
+        return Utils.hex(((b << 16) | a) >>> 0, 8);
+    }
+
+}
+
+export default Adler32Checksum;