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Add possibility to pass seed to keygen in kyber768 #9

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Add possibility to pass seed to keygen in kyber768 #9

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e11a53a
Add possibility to pass seed to keygen
angrymouse Oct 10, 2022
2cbaaf9
Fix support for seed providing possibility
angrymouse Oct 10, 2022
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25 changes: 16 additions & 9 deletions kyber768.js
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Original file line number Diff line number Diff line change
Expand Up @@ -36,9 +36,9 @@ const paramsETA = 2;
// CRYSTALS-KYBER JAVASCRIPT

// 1. KeyGen
KeyGen768 = function() {
KeyGen768 = function(seed) {// Seed - 64 byte array (Uint8Array(64))
// IND-CPA keypair
let indcpakeys = indcpaKeyGen();
let indcpakeys = indcpaKeyGen(seed?seed.slice(0,32):null);

let pk = indcpakeys[0];
let sk = indcpakeys[1];
Expand All @@ -52,9 +52,13 @@ KeyGen768 = function() {
let pkh = hash1.digest();

// read 32 random values (0-255) into a 32 byte array
let rnd = new Uint8Array(32);
let rnd;
if(!seed||seed.length<64){
rnd = new Uint8Array(32);
webcrypto.getRandomValues(rnd); // web api cryptographically strong random values

}else{
rnd=seed.slice(32,64)
}
// concatenate to form IND-CCA2 private key: sk + pk + h(pk) + rnd
for (let i = 0; i < pk.length; i++) {
sk.push(pk[i]);
Expand Down Expand Up @@ -180,11 +184,14 @@ Decrypt768 = function(c, privateKey) {

// indcpaKeyGen generates public and private keys for the CPA-secure
// public-key encryption scheme underlying Kyber.
function indcpaKeyGen() {
function indcpaKeyGen(seed) {// seed - 32 byte array (Uint8Array(32))

// random bytes for seed
let rnd = new Uint8Array(32);
webcrypto.getRandomValues(rnd); // web api cryptographically strong random values
// random bytes for seed or user-provided seed

let rnd =seed?seed: new Uint8Array(32);
if(!seed||seed.length<32){
webcrypto.getRandomValues(rnd); // web api cryptographically strong random values
}

// hash rnd with SHA3-512
const buffer1 = Buffer.from(rnd);
Expand Down Expand Up @@ -1102,4 +1109,4 @@ Test768 = function(){
exports.KeyGen768 = KeyGen768;
exports.Encrypt768 = Encrypt768;
exports.Decrypt768 = Decrypt768;
exports.Test768 = Test768;
exports.Test768 = Test768;