@polkadot/util-crypto
Version:
A collection of useful crypto utilities for @polkadot
28 lines (27 loc) • 1.27 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.scryptFromU8a = scryptFromU8a;
const util_1 = require("@polkadot/util");
const bn_js_1 = require("../bn.js");
const defaults_js_1 = require("./defaults.js");
function scryptFromU8a(data) {
if (!(data instanceof Uint8Array)) {
throw new Error('Expected input to be a Uint8Array');
}
// Ensure the input is exactly 44 bytes: 32 for salt + 3 * 4 for N, p, r
if (data.length < 32 + 12) {
throw new Error(`Invalid input length: expected 44 bytes, found ${data.length}`);
}
const salt = data.subarray(0, 32);
const N = (0, util_1.u8aToBn)(data.subarray(32, 36), bn_js_1.BN_LE_OPTS).toNumber();
const p = (0, util_1.u8aToBn)(data.subarray(36, 40), bn_js_1.BN_LE_OPTS).toNumber();
const r = (0, util_1.u8aToBn)(data.subarray(40, 44), bn_js_1.BN_LE_OPTS).toNumber();
if (N > (1 << 20) || p > 4 || r > 16) {
throw new Error('Scrypt parameters exceed safe limits');
}
const isAllowed = defaults_js_1.ALLOWED_PARAMS.some((preset) => preset.N === N && preset.p === p && preset.r === r);
if (!isAllowed) {
throw new Error('Invalid injected scrypt params found');
}
return { params: { N, p, r }, salt };
}