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Просмотр файла: salsa.js
/**
* [Salsa20](https://cr.yp.to/snuffle.html) stream cipher, released in 2005.
*
* Salsa's goal was to implement AES replacement that does not rely on S-Boxes,
* which are hard to implement in a constant-time manner.
* Salsa20 is usually faster than AES, a big deal on slow, budget mobile phones.
*
* [XSalsa20](https://cr.yp.to/snuffle/xsalsa-20110204.pdf), extended-nonce
* variant was released in 2008. It switched nonces from 96-bit to 192-bit,
* and became safe to be picked at random.
*
* Check out [PDF](https://cr.yp.to/snuffle/salsafamily-20071225.pdf) and
* [wiki](https://en.wikipedia.org/wiki/Salsa20).
* @module
*/
import { createCipher, rotl } from "./_arx.js";
import { poly1305 } from "./_poly1305.js";
import { abytes, clean, equalBytes, getOutput, wrapCipher, } from "./utils.js";
/** Salsa20 core function. */
// prettier-ignore
function salsaCore(s, k, n, out, cnt, rounds = 20) {
// Based on https://cr.yp.to/salsa20.html
let y00 = s[0], y01 = k[0], y02 = k[1], y03 = k[2], // "expa" Key Key Key
y04 = k[3], y05 = s[1], y06 = n[0], y07 = n[1], // Key "nd 3" Nonce Nonce
y08 = cnt, y09 = 0, y10 = s[2], y11 = k[4], // Pos. Pos. "2-by" Key
y12 = k[5], y13 = k[6], y14 = k[7], y15 = s[3]; // Key Key Key "te k"
// Save state to temporary variables
let x00 = y00, x01 = y01, x02 = y02, x03 = y03, x04 = y04, x05 = y05, x06 = y06, x07 = y07, x08 = y08, x09 = y09, x10 = y10, x11 = y11, x12 = y12, x13 = y13, x14 = y14, x15 = y15;
for (let r = 0; r < rounds; r += 2) {
x04 ^= rotl(x00 + x12 | 0, 7);
x08 ^= rotl(x04 + x00 | 0, 9);
x12 ^= rotl(x08 + x04 | 0, 13);
x00 ^= rotl(x12 + x08 | 0, 18);
x09 ^= rotl(x05 + x01 | 0, 7);
x13 ^= rotl(x09 + x05 | 0, 9);
x01 ^= rotl(x13 + x09 | 0, 13);
x05 ^= rotl(x01 + x13 | 0, 18);
x14 ^= rotl(x10 + x06 | 0, 7);
x02 ^= rotl(x14 + x10 | 0, 9);
x06 ^= rotl(x02 + x14 | 0, 13);
x10 ^= rotl(x06 + x02 | 0, 18);
x03 ^= rotl(x15 + x11 | 0, 7);
x07 ^= rotl(x03 + x15 | 0, 9);
x11 ^= rotl(x07 + x03 | 0, 13);
x15 ^= rotl(x11 + x07 | 0, 18);
x01 ^= rotl(x00 + x03 | 0, 7);
x02 ^= rotl(x01 + x00 | 0, 9);
x03 ^= rotl(x02 + x01 | 0, 13);
x00 ^= rotl(x03 + x02 | 0, 18);
x06 ^= rotl(x05 + x04 | 0, 7);
x07 ^= rotl(x06 + x05 | 0, 9);
x04 ^= rotl(x07 + x06 | 0, 13);
x05 ^= rotl(x04 + x07 | 0, 18);
x11 ^= rotl(x10 + x09 | 0, 7);
x08 ^= rotl(x11 + x10 | 0, 9);
x09 ^= rotl(x08 + x11 | 0, 13);
x10 ^= rotl(x09 + x08 | 0, 18);
x12 ^= rotl(x15 + x14 | 0, 7);
x13 ^= rotl(x12 + x15 | 0, 9);
x14 ^= rotl(x13 + x12 | 0, 13);
x15 ^= rotl(x14 + x13 | 0, 18);
}
// Write output
let oi = 0;
out[oi++] = (y00 + x00) | 0;
out[oi++] = (y01 + x01) | 0;
out[oi++] = (y02 + x02) | 0;
out[oi++] = (y03 + x03) | 0;
out[oi++] = (y04 + x04) | 0;
out[oi++] = (y05 + x05) | 0;
out[oi++] = (y06 + x06) | 0;
out[oi++] = (y07 + x07) | 0;
out[oi++] = (y08 + x08) | 0;
out[oi++] = (y09 + x09) | 0;
out[oi++] = (y10 + x10) | 0;
out[oi++] = (y11 + x11) | 0;
out[oi++] = (y12 + x12) | 0;
out[oi++] = (y13 + x13) | 0;
out[oi++] = (y14 + x14) | 0;
out[oi++] = (y15 + x15) | 0;
}
/**
* hsalsa hashing function, used primarily in xsalsa, to hash
* key and nonce into key' and nonce'.
* Same as salsaCore, but there doesn't seem to be a way to move the block
* out without 25% performance hit.
*/
// prettier-ignore
export function hsalsa(s, k, i, o32) {
let x00 = s[0], x01 = k[0], x02 = k[1], x03 = k[2], x04 = k[3], x05 = s[1], x06 = i[0], x07 = i[1], x08 = i[2], x09 = i[3], x10 = s[2], x11 = k[4], x12 = k[5], x13 = k[6], x14 = k[7], x15 = s[3];
for (let r = 0; r < 20; r += 2) {
x04 ^= rotl(x00 + x12 | 0, 7);
x08 ^= rotl(x04 + x00 | 0, 9);
x12 ^= rotl(x08 + x04 | 0, 13);
x00 ^= rotl(x12 + x08 | 0, 18);
x09 ^= rotl(x05 + x01 | 0, 7);
x13 ^= rotl(x09 + x05 | 0, 9);
x01 ^= rotl(x13 + x09 | 0, 13);
x05 ^= rotl(x01 + x13 | 0, 18);
x14 ^= rotl(x10 + x06 | 0, 7);
x02 ^= rotl(x14 + x10 | 0, 9);
x06 ^= rotl(x02 + x14 | 0, 13);
x10 ^= rotl(x06 + x02 | 0, 18);
x03 ^= rotl(x15 + x11 | 0, 7);
x07 ^= rotl(x03 + x15 | 0, 9);
x11 ^= rotl(x07 + x03 | 0, 13);
x15 ^= rotl(x11 + x07 | 0, 18);
x01 ^= rotl(x00 + x03 | 0, 7);
x02 ^= rotl(x01 + x00 | 0, 9);
x03 ^= rotl(x02 + x01 | 0, 13);
x00 ^= rotl(x03 + x02 | 0, 18);
x06 ^= rotl(x05 + x04 | 0, 7);
x07 ^= rotl(x06 + x05 | 0, 9);
x04 ^= rotl(x07 + x06 | 0, 13);
x05 ^= rotl(x04 + x07 | 0, 18);
x11 ^= rotl(x10 + x09 | 0, 7);
x08 ^= rotl(x11 + x10 | 0, 9);
x09 ^= rotl(x08 + x11 | 0, 13);
x10 ^= rotl(x09 + x08 | 0, 18);
x12 ^= rotl(x15 + x14 | 0, 7);
x13 ^= rotl(x12 + x15 | 0, 9);
x14 ^= rotl(x13 + x12 | 0, 13);
x15 ^= rotl(x14 + x13 | 0, 18);
}
let oi = 0;
o32[oi++] = x00;
o32[oi++] = x05;
o32[oi++] = x10;
o32[oi++] = x15;
o32[oi++] = x06;
o32[oi++] = x07;
o32[oi++] = x08;
o32[oi++] = x09;
}
/**
* Salsa20 from original paper.
* Unsafe to use random nonces under the same key, due to collision chance.
* Prefer XSalsa instead.
*/
export const salsa20 = /* @__PURE__ */ createCipher(salsaCore, {
allowShortKeys: true,
counterRight: true,
});
/**
* xsalsa20 eXtended-nonce salsa.
* Can be safely used with random 24-byte nonces (CSPRNG).
*/
export const xsalsa20 = /* @__PURE__ */ createCipher(salsaCore, {
counterRight: true,
extendNonceFn: hsalsa,
});
/**
* xsalsa20-poly1305 eXtended-nonce salsa.
* Can be safely used with random 24-byte nonces (CSPRNG).
* Also known as secretbox from libsodium / nacl.
*/
export const xsalsa20poly1305 = /* @__PURE__ */ wrapCipher({ blockSize: 64, nonceLength: 24, tagLength: 16 }, (key, nonce) => {
return {
encrypt(plaintext, output) {
// xsalsa20poly1305 optimizes by calculating auth key during the same call as encryption.
// Unfortunately, makes it hard to separate tag calculation & encryption itself,
// because 32 bytes is half-block of 64-byte salsa.
output = getOutput(plaintext.length + 32, output, false); // need 32 additional bytes, see above
const authKey = output.subarray(0, 32); // output[0..32] = poly1305 auth key
const ciphPlaintext = output.subarray(32); // output[32..] = plaintext, then ciphertext
output.set(plaintext, 32);
clean(authKey); // authKey is produced by xoring with zeros
xsalsa20(key, nonce, output, output); // output = stream ^ output; authKey = stream ^ zeros(32)
const tag = poly1305(ciphPlaintext, authKey); // calculate tag over ciphertext
output.set(tag, 16); // output[16..32] = tag
clean(output.subarray(0, 16), tag); // clean-up authKey remnants & copy of tag
return output.subarray(16); // return output[16..]
},
decrypt(ciphertext, output) {
// tmp part passed tag ciphertext
// [0..32] [32..48] [48..]
abytes(ciphertext);
output = getOutput(ciphertext.length + 32, output, false);
const tmp = output.subarray(0, 32); // output[0..32] is used to calc authKey
const passedTag = output.subarray(32, 48); // output[32..48] = passed tag
const ciphPlaintext = output.subarray(48); // output[48..] = ciphertext, then plaintext
output.set(ciphertext, 32); // copy ciphertext into output
clean(tmp); // authKey is produced by xoring with zeros
const authKey = xsalsa20(key, nonce, tmp, tmp); // authKey = stream ^ zeros(32)
const tag = poly1305(ciphPlaintext, authKey); // calculate tag over ciphertext
if (!equalBytes(passedTag, tag))
throw new Error('invalid tag');
xsalsa20(key, nonce, output.subarray(16), output.subarray(16)); // output = stream ^ output[16..]
clean(tmp, passedTag, tag);
return ciphPlaintext; // return output[48..], skipping zeroized output[0..48]
},
};
});
/**
* Alias to `xsalsa20poly1305`, for compatibility with libsodium / nacl
*/
export function secretbox(key, nonce) {
const xs = xsalsa20poly1305(key, nonce);
return { seal: xs.encrypt, open: xs.decrypt };
}
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