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import { modPow, bigIntToU8Array, u8ArrayToBigInt } from "./bigint.js";
class DHPublicKey {
constructor(key) {
this._key = key;
}
get algorithm() {
return { name: "DH" };
}
exportKey() {
return this._key;
}
}
export class DHCipher {
constructor() {
this._g = null;
this._p = null;
this._gBigInt = null;
this._pBigInt = null;
this._privateKey = null;
}
get algorithm() {
return { name: "DH" };
}
static generateKey(algorithm, _extractable) {
const cipher = new DHCipher;
cipher._generateKey(algorithm);
return { privateKey: cipher, publicKey: new DHPublicKey(cipher._publicKey) };
}
_generateKey(algorithm) {
const g = algorithm.g;
const p = algorithm.p;
this._keyBytes = p.length;
this._gBigInt = u8ArrayToBigInt(g);
this._pBigInt = u8ArrayToBigInt(p);
this._privateKey = window.crypto.getRandomValues(new Uint8Array(this._keyBytes));
this._privateKeyBigInt = u8ArrayToBigInt(this._privateKey);
this._publicKey = bigIntToU8Array(modPow(
this._gBigInt, this._privateKeyBigInt, this._pBigInt), this._keyBytes);
}
deriveBits(algorithm, length) {
const bytes = Math.ceil(length / 8);
const pkey = new Uint8Array(algorithm.public);
const len = bytes > this._keyBytes ? bytes : this._keyBytes;
const secret = modPow(u8ArrayToBigInt(pkey), this._privateKeyBigInt, this._pBigInt);
return bigIntToU8Array(secret, len).slice(0, len);
}
}
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