@tiny-utils/crypto/lib/asymmetric.js

Tiny utils for crypto: asymmetric/symmetric encryption, ed25519, sha256, etc.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.asymmetricDecrypt = exports.asymmetricEncrypt = exports.publicKeyFromPrivateKey = void 0;
var symmetric_1 = require("./symmetric");
var tweetnacl_1 = require("tweetnacl");
/**
 * @category Crypto
 * @description Method to get public key from private key using *x25519* algorithm.
 *
 * @param privateKey Private key
 * @returns Public key
 */
var publicKeyFromPrivateKey = function (privateKey) {
    return tweetnacl_1.box.keyPair.fromSecretKey(privateKey).publicKey;
};
exports.publicKeyFromPrivateKey = publicKeyFromPrivateKey;
/**
 * @category Crypto
 * @description Method to asymmetrically encrypt the data using *x25519-xsalsa20-poly1305* algorithm.
 *
 * @param data Data to encrypt
 * @param mySecretKey My private key
 * @param theirPublicKey Recipient's public key
 * @returns Encrypted data
 */
var asymmetricEncrypt = function (data, mySecretKey, theirPublicKey) {
    var nonce = (0, tweetnacl_1.randomBytes)(24);
    var encData = (0, tweetnacl_1.box)(data, nonce, theirPublicKey, mySecretKey);
    return (0, symmetric_1.packSymmetricalyEncryptedData)(encData, nonce);
};
exports.asymmetricEncrypt = asymmetricEncrypt;
/**
 * @category Crypto
 * @description Method to asymmetrically decrypt the data using *x25519-xsalsa20-poly1305* algorithm.
 *
 * @param data Data to decrypt
 * @param mySecretKey My private key
 * @param theirPublicKey Sender's public key
 * @returns Decrypted data
 */
var asymmetricDecrypt = function (data, mySecretKey, theirPublicKey) {
    var _a = (0, symmetric_1.unpackSymmetricalyEncryptedData)(data), nonce = _a.nonce, encData = _a.encData;
    var decData = tweetnacl_1.box.open(encData, nonce, theirPublicKey, mySecretKey);
    if (!decData) {
        throw new Error("asymmetricDecrypt: Invalid box or key");
    }
    return decData;
};
exports.asymmetricDecrypt = asymmetricDecrypt;
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