@polkadot/util-crypto
Version:
A collection of useful crypto utilities for @polkadot
34 lines (33 loc) • 1.44 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.jsonDecryptData = void 0;
const util_1 = require("@polkadot/util");
const index_js_1 = require("../nacl/index.js");
const index_js_2 = require("../scrypt/index.js");
const constants_js_1 = require("./constants.js");
function jsonDecryptData(encrypted, passphrase, encType = constants_js_1.ENCODING) {
if (!encrypted) {
throw new Error('No encrypted data available to decode');
}
else if (encType.includes('xsalsa20-poly1305') && !passphrase) {
throw new Error('Password required to decode encrypted data');
}
let encoded = encrypted;
if (passphrase) {
let password;
if (encType.includes('scrypt')) {
const { params, salt } = (0, index_js_2.scryptFromU8a)(encrypted);
password = (0, index_js_2.scryptEncode)(passphrase, salt, params).password;
encrypted = encrypted.subarray(constants_js_1.SCRYPT_LENGTH);
}
else {
password = (0, util_1.stringToU8a)(passphrase);
}
encoded = (0, index_js_1.naclDecrypt)(encrypted.subarray(constants_js_1.NONCE_LENGTH), encrypted.subarray(0, constants_js_1.NONCE_LENGTH), (0, util_1.u8aFixLength)(password, 256, true));
}
if (!encoded) {
throw new Error('Unable to decode using the supplied passphrase');
}
return encoded;
}
exports.jsonDecryptData = jsonDecryptData;