165 lines
No EOL
6.7 KiB
JavaScript
165 lines
No EOL
6.7 KiB
JavaScript
import {} from "./pbkdf2.js";
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import { abytes, ahash, anumber, checkOpts, kdfInputToBytes, } from "./utils.js";
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function _subtle() {
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const cr = typeof globalThis === 'object' ? globalThis.crypto : null;
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const sb = cr?.subtle;
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if (typeof sb === 'object' && sb != null)
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return sb;
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throw new Error('crypto.subtle must be defined');
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}
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function createWebHash(name, blockLen, outputLen) {
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const hashC = async (msg) => {
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abytes(msg);
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const crypto = _subtle();
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return new Uint8Array(await crypto.digest(name, msg));
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};
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hashC.webCryptoName = name; // make sure it won't interfere with function name
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hashC.outputLen = outputLen;
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hashC.blockLen = blockLen;
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hashC.create = () => {
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// Present only so this async wrapper satisfies the shared
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// hash-wrapper shape checked by `ahashWeb()`.
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throw new Error('not implemented');
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};
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// Later WebCrypto HMAC/HKDF/PBKDF2 calls read descriptor metadata directly, so freezing prevents
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// callers from retargeting a `sha256` wrapper into a different backend digest by mutation.
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return Object.freeze(hashC);
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}
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function ahashWeb(hash) {
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ahash(hash);
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if (typeof hash.webCryptoName !== 'string')
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throw new Error('non-web hash');
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}
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/** WebCrypto SHA1 (RFC 3174) legacy hash function. It was cryptographically broken. */
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// export const sha1: WebHash = createHash('SHA-1', 64, 20);
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/**
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* WebCrypto SHA2-256 hash function from RFC 6234.
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* @param msg - message bytes to hash
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* @returns Promise resolving to digest bytes.
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* @example
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* Hash a message with WebCrypto SHA2-256.
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* ```ts
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* await sha256(new Uint8Array([97, 98, 99]));
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* ```
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*/
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export const sha256 = /* @__PURE__ */ createWebHash('SHA-256', 64, 32);
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/**
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* WebCrypto SHA2-384 hash function from RFC 6234.
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* @param msg - message bytes to hash
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* @returns Promise resolving to digest bytes.
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* @example
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* Hash a message with WebCrypto SHA2-384.
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* ```ts
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* await sha384(new Uint8Array([97, 98, 99]));
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* ```
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*/
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export const sha384 = /* @__PURE__ */ createWebHash('SHA-384', 128, 48);
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/**
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* WebCrypto SHA2-512 hash function from RFC 6234.
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* @param msg - message bytes to hash
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* @returns Promise resolving to digest bytes.
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* @example
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* Hash a message with WebCrypto SHA2-512.
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* ```ts
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* await sha512(new Uint8Array([97, 98, 99]));
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* ```
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*/
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export const sha512 = /* @__PURE__ */ createWebHash('SHA-512', 128, 64);
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export const hmac = /* @__PURE__ */ (() => {
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const hmac_ = async (hash, key, message) => {
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const crypto = _subtle();
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abytes(key, undefined, 'key');
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abytes(message, undefined, 'message');
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ahashWeb(hash);
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// WebCrypto keys can't be zeroized
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// prettier-ignore
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const wkey = await crypto.importKey('raw', key, { name: 'HMAC', hash: hash.webCryptoName }, false, ['sign']);
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return new Uint8Array(await crypto.sign('HMAC', wkey, message));
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};
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hmac_.create = (_hash, _key) => {
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throw new Error('not implemented');
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};
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return hmac_;
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})();
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/**
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* WebCrypto HKDF (RFC 5869): derive keys from an initial input.
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* Combines hkdf_extract + hkdf_expand in one step
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* @param hash - hash function that would be used (e.g. sha256). Webcrypto version.
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* @param ikm - input keying material, the initial key
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* @param salt - optional salt value (a non-secret random value)
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* @param info - optional context and application specific information bytes
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* @param length - length of output keying material in bytes.
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* RFC 5869 §2.3 allows `0..255*HashLen`, so `0` requests an empty OKM.
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* @returns Promise resolving to derived key bytes.
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* The RFC `L <= 255 * HashLen` bound is currently enforced only by backend
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* `deriveBits()` rejection, not by an explicit library-side guard.
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* @throws If the current runtime does not provide `crypto.subtle`. {@link Error}
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* @example
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* WebCrypto HKDF (RFC 5869): derive keys from an initial input.
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* ```ts
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* import { hkdf, sha256 } from '@noble/hashes/webcrypto.js';
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* import { randomBytes, utf8ToBytes } from '@noble/hashes/utils.js';
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* const inputKey = randomBytes(32);
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* const salt = randomBytes(32);
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* const info = utf8ToBytes('application-key');
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* const okm = await hkdf(sha256, inputKey, salt, info, 32);
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* ```
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*/
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export async function hkdf(hash, ikm, salt, info, length) {
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const crypto = _subtle();
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ahashWeb(hash);
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abytes(ikm, undefined, 'ikm');
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anumber(length, 'length');
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if (salt !== undefined)
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abytes(salt, undefined, 'salt');
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if (info !== undefined)
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abytes(info, undefined, 'info');
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const wkey = await crypto.importKey('raw', ikm, 'HKDF', false, ['deriveBits']);
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const opts = {
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name: 'HKDF',
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hash: hash.webCryptoName,
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salt: salt === undefined ? new Uint8Array(0) : salt,
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info: info === undefined ? new Uint8Array(0) : info,
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};
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return new Uint8Array(await crypto.deriveBits(opts, wkey, 8 * length));
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}
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/**
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* WebCrypto PBKDF2-HMAC: RFC 8018 key derivation function.
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* @param hash - hash function that would be used e.g. sha256. Webcrypto version.
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* @param password - password from which a derived key is generated; string
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* inputs are normalized through `kdfInputToBytes()`, i.e. UTF-8
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* @param salt - cryptographic salt; string inputs are normalized through
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* `kdfInputToBytes()`, i.e. UTF-8
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* @param opts - PBKDF2 work factor and output settings. `dkLen`, if provided,
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* must be `>= 1` per RFC 8018 §5.2. See {@link Pbkdf2Opt}.
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* @returns Promise resolving to derived key bytes.
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* Positive-iteration enforcement is currently delegated to backend
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* `deriveBits()` rejection (for example `c = 0`), not a dedicated
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* library-side guard.
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* @throws If the current runtime does not provide `crypto.subtle`. {@link Error}
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* @example
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* WebCrypto PBKDF2-HMAC: RFC 2898 key derivation function.
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* ```ts
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* import { pbkdf2, sha256 } from '@noble/hashes/webcrypto.js';
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* const key = await pbkdf2(sha256, 'password', 'salt', { dkLen: 32, c: Math.pow(2, 18) });
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* ```
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*/
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export async function pbkdf2(hash, password, salt, opts) {
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const crypto = _subtle();
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ahashWeb(hash);
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const _opts = checkOpts({ dkLen: 32 }, opts);
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const { c, dkLen } = _opts;
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anumber(c, 'c');
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anumber(dkLen, 'dkLen');
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// RFC 8018 §5.2 defines dkLen as a positive integer.
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if (dkLen < 1)
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throw new Error('"dkLen" must be >= 1');
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const _password = kdfInputToBytes(password, 'password');
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const _salt = kdfInputToBytes(salt, 'salt');
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const key = await crypto.importKey('raw', _password, 'PBKDF2', false, [
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'deriveBits',
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]);
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const deriveOpts = { name: 'PBKDF2', salt: _salt, iterations: c, hash: hash.webCryptoName };
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return new Uint8Array(await crypto.deriveBits(deriveOpts, key, 8 * dkLen));
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}
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//# sourceMappingURL=webcrypto.js.map
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