@tidecloak/js
Version:
TideCloak client side JS SDK
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JavaScript
//
// Tide Protocol - Infrastructure for a TRUE Zero-Trust paradigm
// Copyright (C) 2022 Tide Foundation Ltd
//
// This program is free software and is subject to the terms of
// the Tide Community Open Code License as published by the
// Tide Foundation Limited. You may modify it and redistribute
// it in accordance with and subject to the terms of that License.
// This program is distributed WITHOUT WARRANTY of any kind,
// including without any implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
// See the Tide Community Open Code License for more details.
// You should have received a copy of the Tide Community Open
// Code License along with this program.
// If not, see https://tide.org/licenses_tcoc2-0-0-en
//
import { Point } from "../Ed25519.js";
import { RandomBigInt } from "../Math.js";
import { encryptDataRawOutput, decryptData, decryptDataRawOutput } from "./AES.js";
import { SHA256_Digest } from "../Hashing/Hash.js";
import { BigIntFromByteArray, ConcatUint8Arrays, base64ToBytes, bytesToBase64 } from "../Serialization.js";
export default class ElGamal {
/**
*
* @param {Uint8Array} secretData
* @param {Point} publicKey
*/
static async encryptData(secretData, publicKey) {
return bytesToBase64(await this.encryptDataRaw(secretData, publicKey));
}
/**
*
* @param {Uint8Array} secretData
* @param {Point} publicKey
*/
static async encryptDataRaw(secretData, publicKey) {
const r = RandomBigInt();
const c1 = Point.BASE.mul(r).toRawBytes();
const c2 = await encryptDataRawOutput(secretData, await SHA256_Digest(publicKey.mul(r).toRawBytes()));
return ConcatUint8Arrays([c1, c2]);
}
/**
* @param {string} base64_c1_c2
* @param {bigint | Uint8Array} k
*/
static async decryptData(base64_c1_c2, k) {
const priv = typeof (k) == 'bigint' ? k : BigIntFromByteArray(k);
const b = base64ToBytes(base64_c1_c2);
const c1 = b.slice(0, 32);
const c2 = b.slice(32);
const c1Point = Point.fromBytes(c1);
const decrypted = await decryptDataRawOutput(c2, await SHA256_Digest(c1Point.mul(priv).toRawBytes()));
return decrypted;
}
}
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