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* noble-ciphers-micro: more auditable, but 4x slower version of salsa20, chacha & poly1305.
* Implements the same algorithms that are present in other files, but without
* unrolled loops (https://en.wikipedia.org/wiki/Loop_unrolling).
* @module
*/
/*! noble-ciphers - MIT License (c) 2023 Paul Miller (paulmillr.com) */
// prettier-ignore
import { createCipher, rotl } from "./_arx.js";
import { abytes, bytesToHex, concatBytes, equalBytes, hexToNumber, numberToBytesBE, u64Lengths, wrapCipher, } from "./utils.js";
function bytesToNumberLE(bytes) {
abytes(bytes);
return hexToNumber(bytesToHex(Uint8Array.from(bytes).reverse()));
}
function numberToBytesLE(n, len) {
return numberToBytesBE(n, len).reverse();
}
function salsaQR(x, a, b, c, d) {
x[b] ^= rotl((x[a] + x[d]) | 0, 7);
x[c] ^= rotl((x[b] + x[a]) | 0, 9);
x[d] ^= rotl((x[c] + x[b]) | 0, 13);
x[a] ^= rotl((x[d] + x[c]) | 0, 18);
}
// prettier-ignore
function chachaQR(x, a, b, c, d) {
x[a] = (x[a] + x[b]) | 0;
x[d] = rotl(x[d] ^ x[a], 16);
x[c] = (x[c] + x[d]) | 0;
x[b] = rotl(x[b] ^ x[c], 12);
x[a] = (x[a] + x[b]) | 0;
x[d] = rotl(x[d] ^ x[a], 8);
x[c] = (x[c] + x[d]) | 0;
x[b] = rotl(x[b] ^ x[c], 7);
}
function salsaRound(x, rounds = 20) {
for (let r = 0; r < rounds; r += 2) {
salsaQR(x, 0, 4, 8, 12);
salsaQR(x, 5, 9, 13, 1);
salsaQR(x, 10, 14, 2, 6);
salsaQR(x, 15, 3, 7, 11);
salsaQR(x, 0, 1, 2, 3);
salsaQR(x, 5, 6, 7, 4);
salsaQR(x, 10, 11, 8, 9);
salsaQR(x, 15, 12, 13, 14);
}
}
function chachaRound(x, rounds = 20) {
for (let r = 0; r < rounds; r += 2) {
chachaQR(x, 0, 4, 8, 12);
chachaQR(x, 1, 5, 9, 13);
chachaQR(x, 2, 6, 10, 14);
chachaQR(x, 3, 7, 11, 15);
chachaQR(x, 0, 5, 10, 15);
chachaQR(x, 1, 6, 11, 12);
chachaQR(x, 2, 7, 8, 13);
chachaQR(x, 3, 4, 9, 14);
}
}
function salsaCore(s, k, n, out, cnt, rounds = 20) {
// prettier-ignore
const y = new Uint32Array([
s[0], k[0], k[1], k[2], // "expa" Key Key Key
k[3], s[1], n[0], n[1], // Key "nd 3" Nonce Nonce
cnt, 0, s[2], k[4], // Pos. Pos. "2-by" Key
k[5], k[6], k[7], s[3], // Key Key Key "te k"
]);
const x = y.slice();
salsaRound(x, rounds);
for (let i = 0; i < 16; i++)
out[i] = (y[i] + x[i]) | 0;
}
/** hsalsa hashes key and nonce into key' and nonce'. */
// prettier-ignore
export function hsalsa(s, k, i, o32) {
const x = new Uint32Array([
s[0], k[0], k[1], k[2],
k[3], s[1], i[0], i[1],
i[2], i[3], s[2], k[4],
k[5], k[6], k[7], s[3]
]);
salsaRound(x, 20);
let oi = 0;
o32[oi++] = x[0];
o32[oi++] = x[5];
o32[oi++] = x[10];
o32[oi++] = x[15];
o32[oi++] = x[6];
o32[oi++] = x[7];
o32[oi++] = x[8];
o32[oi++] = x[9];
}
function chachaCore(s, k, n, out, cnt, rounds = 20) {
// prettier-ignore
const y = new Uint32Array([
s[0], s[1], s[2], s[3], // "expa" "nd 3" "2-by" "te k"
k[0], k[1], k[2], k[3], // Key Key Key Key
k[4], k[5], k[6], k[7], // Key Key Key Key
cnt, n[0], n[1], n[2], // Counter Counter Nonce Nonce
]);
const x = y.slice();
chachaRound(x, rounds);
for (let i = 0; i < 16; i++)
out[i] = (y[i] + x[i]) | 0;
}
/** hchacha hashes key and nonce into key' and nonce'. */
// prettier-ignore
export function hchacha(s, k, i, o32) {
const x = new Uint32Array([
s[0], s[1], s[2], s[3],
k[0], k[1], k[2], k[3],
k[4], k[5], k[6], k[7],
i[0], i[1], i[2], i[3],
]);
chachaRound(x, 20);
let oi = 0;
o32[oi++] = x[0];
o32[oi++] = x[1];
o32[oi++] = x[2];
o32[oi++] = x[3];
o32[oi++] = x[12];
o32[oi++] = x[13];
o32[oi++] = x[14];
o32[oi++] = x[15];
}
/** salsa20, 12-byte nonce. */
export const salsa20 = /* @__PURE__ */ createCipher(salsaCore, {
allowShortKeys: true,
counterRight: true,
});
/** xsalsa20, 24-byte nonce. */
export const xsalsa20 = /* @__PURE__ */ createCipher(salsaCore, {
counterRight: true,
extendNonceFn: hsalsa,
});
/** chacha20 non-RFC, original version by djb. 8-byte nonce, 8-byte counter. */
export const chacha20orig = /* @__PURE__ */ createCipher(chachaCore, {
allowShortKeys: true,
counterRight: false,
counterLength: 8,
});
/** chacha20 RFC 8439 (IETF / TLS). 12-byte nonce, 4-byte counter. */
export const chacha20 = /* @__PURE__ */ createCipher(chachaCore, {
counterRight: false,
counterLength: 4,
});
/** xchacha20 eXtended-nonce. https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha */
export const xchacha20 = /* @__PURE__ */ createCipher(chachaCore, {
counterRight: false,
counterLength: 8,
extendNonceFn: hchacha,
});
/** 8-round chacha from the original paper. */
export const chacha8 = /* @__PURE__ */ createCipher(chachaCore, {
counterRight: false,
counterLength: 4,
rounds: 8,
});
/** 12-round chacha from the original paper. */
export const chacha12 = /* @__PURE__ */ createCipher(chachaCore, {
counterRight: false,
counterLength: 4,
rounds: 12,
});
const POW_2_130_5 = BigInt(2) ** BigInt(130) - BigInt(5);
const POW_2_128_1 = BigInt(2) ** BigInt(16 * 8) - BigInt(1);
const CLAMP_R = BigInt('0x0ffffffc0ffffffc0ffffffc0fffffff');
const _0 = BigInt(0);
const _1 = BigInt(1);
/** Poly1305 polynomial MAC. Can be speed-up using BigUint64Array, at the cost of complexity. */
export function poly1305(msg, key) {
abytes(msg);
abytes(key, 32);
let acc = _0;
const r = bytesToNumberLE(key.subarray(0, 16)) & CLAMP_R;
const s = bytesToNumberLE(key.subarray(16));
// Process by 16 byte chunks
for (let i = 0; i < msg.length; i += 16) {
const m = msg.subarray(i, i + 16);
const n = bytesToNumberLE(m) | (_1 << BigInt(8 * m.length));
acc = ((acc + n) * r) % POW_2_130_5;
}
const res = (acc + s) & POW_2_128_1;
return numberToBytesLE(res, 16);
}
function computeTag(fn, key, nonce, ciphertext, AAD) {
const res = [];
if (AAD) {
res.push(AAD);
const leftover = AAD.length % 16;
if (leftover > 0)
res.push(new Uint8Array(16 - leftover));
}
res.push(ciphertext);
const leftover = ciphertext.length % 16;
if (leftover > 0)
res.push(new Uint8Array(16 - leftover));
res.push(u64Lengths(ciphertext.length, AAD ? AAD.length : 0, true));
const authKey = fn(key, nonce, new Uint8Array(32));
return poly1305(concatBytes(...res), authKey);
}
/** xsalsa20-poly1305 eXtended-nonce (24 bytes) salsa. */
export const xsalsa20poly1305 = /* @__PURE__ */ wrapCipher({ blockSize: 64, nonceLength: 24, tagLength: 16 }, function xsalsapoly(key, nonce) {
return {
encrypt(plaintext) {
const m = concatBytes(new Uint8Array(32), plaintext);
const c = xsalsa20(key, nonce, m);
const authKey = c.subarray(0, 32);
const data = c.subarray(32);
const tag = poly1305(data, authKey);
return concatBytes(tag, data);
},
decrypt(ciphertext) {
const c = concatBytes(new Uint8Array(16), ciphertext);
const passedTag = c.subarray(16, 32);
const authKey = xsalsa20(key, nonce, new Uint8Array(32));
const tag = poly1305(c.subarray(32), authKey);
if (!equalBytes(tag, passedTag))
throw new Error('invalid poly1305 tag');
return xsalsa20(key, nonce, c).subarray(32);
},
};
});
/** Alias to `xsalsa20poly1305`. */
export function secretbox(key, nonce) {
const xs = xsalsa20poly1305(key, nonce);
return { seal: xs.encrypt, open: xs.decrypt };
}
export const _poly1305_aead = (fn) => (key, nonce, AAD) => {
const tagLength = 16;
return {
encrypt(plaintext) {
const data = fn(key, nonce, plaintext, undefined, 1); // stream from i=1
const tag = computeTag(fn, key, nonce, data, AAD);
return concatBytes(data, tag);
},
decrypt(ciphertext) {
const passedTag = ciphertext.subarray(-tagLength);
const data = ciphertext.subarray(0, -tagLength);
const tag = computeTag(fn, key, nonce, data, AAD);
if (!equalBytes(tag, passedTag))
throw new Error('invalid poly1305 tag');
return fn(key, nonce, data, undefined, 1); // stream from i=1
},
};
};
/** chacha20-poly1305 12-byte-nonce chacha. */
export const chacha20poly1305 = /* @__PURE__ */ wrapCipher({ blockSize: 64, nonceLength: 12, tagLength: 16 }, _poly1305_aead(chacha20));
/**
* XChaCha20-Poly1305 extended-nonce chacha. Can be safely used with random nonces (CSPRNG).
*/
export const xchacha20poly1305 = /* @__PURE__ */ wrapCipher({ blockSize: 64, nonceLength: 24, tagLength: 16 }, _poly1305_aead(xchacha20));
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