CyberChef/src/core/lib/CipherSaber2.mjs

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2020-02-14 15:21:32 +01:00
/**
* @author n1073645 [n1073645@gmail.com]
* @copyright Crown Copyright 2020
* @license Apache-2.0
*/
export function encode(tempIVP, key, rounds, input) {
const ivp = new Uint8Array(key.concat(tempIVP));
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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 < rounds; r ++) {
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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;
}