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Fix: Randomize 24-bit nonce and prepend to CTR

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multipleof4
2026-03-10 21:42:02 -07:00
parent 0887abffea
commit 693e0860c3
1 changed files with 19 additions and 15 deletions
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32
speck48_96ctr.js
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@@ -13,26 +13,30 @@ export function getKey(kStr) {
];
}
function deriveNonce(key) {
return speck48_96.encrypt(0, key) & 0xFFFFFF;
}
function ctrKeystream(key, index) {
const nonce = deriveNonce(key);
const ctrBlock = nonce * 16777216 + (index & 0xFFFFFF);
return speck48_96.encrypt(ctrBlock, key);
}
export function encrypt(ptStr, key) {
return Array.from(ptStr, (c, i) => {
const ks = ctrKeystream(key, i);
// Generate a cryptographically secure random 24-bit nonce
const nonce = globalThis.crypto.getRandomValues(new Uint32Array(1))[0] & 0xFFFFFF;
const ctArr = Array.from(ptStr, (c, i) => {
const ctrBlock = nonce * 16777216 + (i & 0xFFFFFF);
const ks = speck48_96.encrypt(ctrBlock, key);
return (c.codePointAt(0) ^ ks) >>> 0;
});
// Prepend the nonce to the ciphertext array
return [nonce, ...ctArr];
}
export function decrypt(numArr, key) {
return numArr.map((ct, i) => {
const ks = ctrKeystream(key, i);
if (!numArr || numArr.length === 0) return '';
// Extract the nonce from the first element
const nonce = numArr[0];
const ctArr = numArr.slice(1);
return ctArr.map((ct, i) => {
const ctrBlock = nonce * 16777216 + (i & 0xFFFFFF);
const ks = speck48_96.encrypt(ctrBlock, key);
const cp = (ct ^ ks) >>> 0;
try { return String.fromCodePoint(cp); }
catch { return ''; }