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

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.unpackSymmetricalyEncryptedData = exports.symmetricDecrypt = exports.packSymmetricalyEncryptedData = exports.symmetricEncrypt = void 0;
var tweetnacl_1 = require("tweetnacl");
var bytes_1 = require("@tiny-utils/bytes");
/**
 * @category Crypto
 * @description Method to symmetrically encrypt the data using *xsalsa20-poly1305* algorithm.
 *
 * @param data Data to encrypt
 * @param key Symmetric key to encrypt the data
 * @returns Encrypted data
 */
var symmetricEncrypt = function (data, key) {
    var nonce = (0, tweetnacl_1.randomBytes)(24);
    var encData = tweetnacl_1.box.after(data, nonce, key);
    return (0, exports.packSymmetricalyEncryptedData)(encData, nonce);
};
exports.symmetricEncrypt = symmetricEncrypt;
/**
 * Method to pack data and nonce into one readable bytes array
 *
 * @param encData Encrypted data raw bytes
 * @param nonce Nonce raw bytes
 * @returns Container buffer
 */
var packSymmetricalyEncryptedData = function (encData, nonce) {
    var buf = bytes_1.SmartBuffer.ofSize(1 + 1 + nonce.length + 4 + encData.length);
    buf.writeUint8(1);
    buf.writeBytes8Length(nonce);
    buf.writeBytes32Length(encData);
    return buf.bytes;
};
exports.packSymmetricalyEncryptedData = packSymmetricalyEncryptedData;
/**
 * @category Crypto
 * @description Method to symmetrically decrypt the data using *xsalsa20-poly1305* algorithm.
 *
 * @param data Data to decrypt
 * @param key Symmetric key to decrypt the data
 * @returns Decrypted data
 */
var symmetricDecrypt = function (data, key) {
    var _a = (0, exports.unpackSymmetricalyEncryptedData)(data), nonce = _a.nonce, encData = _a.encData;
    var decData = tweetnacl_1.box.open.after(encData, nonce, key);
    if (!decData) {
        throw new Error("symmetricDecrypt: Invalid box or key");
    }
    return decData;
};
exports.symmetricDecrypt = symmetricDecrypt;
/**
 * Method to unpack data and nonce from one readable bytes array
 *
 * @param data Bytes with encrypted data and nonce
 * @returns Data and nonce
 */
var unpackSymmetricalyEncryptedData = function (data) {
    var buf = new bytes_1.SmartBuffer(data);
    var version = buf.readUint8();
    var nonce = buf.readBytes8Length();
    var encData = buf.readBytes32Length();
    return {
        nonce: nonce,
        encData: encData,
    };
};
exports.unpackSymmetricalyEncryptedData = unpackSymmetricalyEncryptedData;
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