Modifications made to CipherSaber2

src/core/lib/CipherSaber2.mjs

@@ -0,0 +1,36 @@
+import Utils from "../Utils.mjs";
+
+/**
+ * @author n1073645 [n1073645@gmail.com]
+ * @copyright Crown Copyright 2020
+ * @license Apache-2.0
+ */
+export function encode(tempIVP, args, input) {
+    const ivp = new Uint8Array(Utils.strToByteArray(args[0]).concat(tempIVP));
+    const state = new Array(256).fill(0);
+    let j = 0, i = 0;
+    const result = [];
+
+    // Mixing states based off of IV.
+    for (let i = 0; i < 256; i++)
+        state[i] = i;
+    const ivpLength = ivp.length;
+    for (let r = 0; r < args[1]; r ++) {
+        for (let k = 0; k < 256; k++) {
+            j = (j + state[k] + ivp[k % ivpLength]) % 256;
+            [state[k], state[j]] = [state[j], state[k]];
+        }
+    }
+    j = 0;
+    i = 0;
+
+    // XOR cipher with key.
+    for (let x = 0; x < input.length; x++) {
+        i = (++i) % 256;
+        j = (j + state[i]) % 256;
+        [state[i], state[j]] = [state[j], state[i]];
+        const n = (state[i] + state[j]) % 256;
+        result.push(state[n] ^ input[x]);
+    }
+    return result;
+}