PHP WebShell
Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@near-js/crypto/node_modules/@noble/hashes
Просмотр файла: hkdf.js
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.hkdf = void 0;
exports.extract = extract;
exports.expand = expand;
/**
* HKDF (RFC 5869): extract + expand in one step.
* See https://soatok.blog/2021/11/17/understanding-hkdf/.
* @module
*/
const _assert_js_1 = require("./_assert.js");
const hmac_js_1 = require("./hmac.js");
const utils_js_1 = require("./utils.js");
/**
* HKDF-extract from spec. Less important part. `HKDF-Extract(IKM, salt) -> PRK`
* Arguments position differs from spec (IKM is first one, since it is not optional)
* @param hash - hash function that would be used (e.g. sha256)
* @param ikm - input keying material, the initial key
* @param salt - optional salt value (a non-secret random value)
*/
function extract(hash, ikm, salt) {
(0, _assert_js_1.ahash)(hash);
// NOTE: some libraries treat zero-length array as 'not provided';
// we don't, since we have undefined as 'not provided'
// https://github.com/RustCrypto/KDFs/issues/15
if (salt === undefined)
salt = new Uint8Array(hash.outputLen);
return (0, hmac_js_1.hmac)(hash, (0, utils_js_1.toBytes)(salt), (0, utils_js_1.toBytes)(ikm));
}
const HKDF_COUNTER = /* @__PURE__ */ new Uint8Array([0]);
const EMPTY_BUFFER = /* @__PURE__ */ new Uint8Array();
/**
* HKDF-expand from the spec. The most important part. `HKDF-Expand(PRK, info, L) -> OKM`
* @param hash - hash function that would be used (e.g. sha256)
* @param prk - a pseudorandom key of at least HashLen octets (usually, the output from the extract step)
* @param info - optional context and application specific information (can be a zero-length string)
* @param length - length of output keying material in bytes
*/
function expand(hash, prk, info, length = 32) {
(0, _assert_js_1.ahash)(hash);
(0, _assert_js_1.anumber)(length);
if (length > 255 * hash.outputLen)
throw new Error('Length should be <= 255*HashLen');
const blocks = Math.ceil(length / hash.outputLen);
if (info === undefined)
info = EMPTY_BUFFER;
// first L(ength) octets of T
const okm = new Uint8Array(blocks * hash.outputLen);
// Re-use HMAC instance between blocks
const HMAC = hmac_js_1.hmac.create(hash, prk);
const HMACTmp = HMAC._cloneInto();
const T = new Uint8Array(HMAC.outputLen);
for (let counter = 0; counter < blocks; counter++) {
HKDF_COUNTER[0] = counter + 1;
// T(0) = empty string (zero length)
// T(N) = HMAC-Hash(PRK, T(N-1) | info | N)
HMACTmp.update(counter === 0 ? EMPTY_BUFFER : T)
.update(info)
.update(HKDF_COUNTER)
.digestInto(T);
okm.set(T, hash.outputLen * counter);
HMAC._cloneInto(HMACTmp);
}
HMAC.destroy();
HMACTmp.destroy();
T.fill(0);
HKDF_COUNTER.fill(0);
return okm.slice(0, length);
}
/**
* HKDF (RFC 5869): derive keys from an initial input.
* Combines hkdf_extract + hkdf_expand in one step
* @param hash - hash function that would be used (e.g. sha256)
* @param ikm - input keying material, the initial key
* @param salt - optional salt value (a non-secret random value)
* @param info - optional context and application specific information (can be a zero-length string)
* @param length - length of output keying material in bytes
* @example
* import { hkdf } from '@noble/hashes/hkdf';
* import { sha256 } from '@noble/hashes/sha2';
* import { randomBytes } from '@noble/hashes/utils';
* const inputKey = randomBytes(32);
* const salt = randomBytes(32);
* const info = 'application-key';
* const hk1 = hkdf(sha256, inputKey, salt, info, 32);
*/
const hkdf = (hash, ikm, salt, info, length) => expand(hash, extract(hash, ikm, salt), info, length);
exports.hkdf = hkdf;
//# sourceMappingURL=hkdf.js.mapВыполнить команду
Для локальной разработки. Не используйте в интернете!