578 lines
No EOL
20 KiB
JavaScript
578 lines
No EOL
20 KiB
JavaScript
/**
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* Checks if something is Uint8Array. Be careful: nodejs Buffer will return true.
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* @param a - value to test
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* @returns `true` when the value is a Uint8Array-compatible view.
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* @example
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* Check whether a value is a Uint8Array-compatible view.
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* ```ts
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* isBytes(new Uint8Array([1, 2, 3]));
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* ```
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*/
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export function isBytes(a) {
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// Plain `instanceof Uint8Array` is too strict for some Buffer / proxy / cross-realm cases.
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// The fallback still requires a real ArrayBuffer view, so plain
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// JSON-deserialized `{ constructor: ... }` spoofing is rejected, and
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// `BYTES_PER_ELEMENT === 1` keeps the fallback on byte-oriented views.
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return (a instanceof Uint8Array ||
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(ArrayBuffer.isView(a) &&
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a.constructor.name === 'Uint8Array' &&
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'BYTES_PER_ELEMENT' in a &&
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a.BYTES_PER_ELEMENT === 1));
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}
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/**
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* Asserts something is a non-negative integer.
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* @param n - number to validate
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* @param title - label included in thrown errors
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* @throws On wrong argument types. {@link TypeError}
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* @throws On wrong argument ranges or values. {@link RangeError}
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* @example
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* Validate a non-negative integer option.
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* ```ts
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* anumber(32, 'length');
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* ```
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*/
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export function anumber(n, title = '') {
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if (typeof n !== 'number') {
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const prefix = title && `"${title}" `;
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throw new TypeError(`${prefix}expected number, got ${typeof n}`);
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}
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if (!Number.isSafeInteger(n) || n < 0) {
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const prefix = title && `"${title}" `;
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throw new RangeError(`${prefix}expected integer >= 0, got ${n}`);
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}
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}
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/**
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* Asserts something is Uint8Array.
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* @param value - value to validate
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* @param length - optional exact length constraint
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* @param title - label included in thrown errors
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* @returns The validated byte array.
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* @throws On wrong argument types. {@link TypeError}
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* @throws On wrong argument ranges or values. {@link RangeError}
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* @example
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* Validate that a value is a byte array.
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* ```ts
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* abytes(new Uint8Array([1, 2, 3]));
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* ```
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*/
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export function abytes(value, length, title = '') {
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const bytes = isBytes(value);
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const len = value?.length;
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const needsLen = length !== undefined;
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if (!bytes || (needsLen && len !== length)) {
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const prefix = title && `"${title}" `;
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const ofLen = needsLen ? ` of length ${length}` : '';
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const got = bytes ? `length=${len}` : `type=${typeof value}`;
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const message = prefix + 'expected Uint8Array' + ofLen + ', got ' + got;
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if (!bytes)
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throw new TypeError(message);
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throw new RangeError(message);
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}
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return value;
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}
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/**
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* Copies bytes into a fresh Uint8Array.
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* Buffer-style slices can alias the same backing store, so callers that need ownership should copy.
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* @param bytes - source bytes to clone
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* @returns Freshly allocated copy of `bytes`.
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* @throws On wrong argument types. {@link TypeError}
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* @example
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* Clone a byte array before mutating it.
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* ```ts
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* const copy = copyBytes(new Uint8Array([1, 2, 3]));
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* ```
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*/
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export function copyBytes(bytes) {
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// `Uint8Array.from(...)` would also accept arrays / other typed arrays. Keep this helper strict
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// because callers use it at byte-validation boundaries before mutating the detached copy.
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return Uint8Array.from(abytes(bytes));
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}
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/**
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* Asserts something is a wrapped hash constructor.
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* @param h - hash constructor to validate
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* @throws On wrong argument types or invalid hash wrapper shape. {@link TypeError}
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* @throws On invalid hash metadata ranges or values. {@link RangeError}
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* @throws If the hash metadata allows empty outputs or block sizes. {@link Error}
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* @example
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* Validate a callable hash wrapper.
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* ```ts
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* import { ahash } from '@noble/hashes/utils.js';
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* import { sha256 } from '@noble/hashes/sha2.js';
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* ahash(sha256);
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* ```
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*/
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export function ahash(h) {
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if (typeof h !== 'function' || typeof h.create !== 'function')
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throw new TypeError('Hash must wrapped by utils.createHasher');
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anumber(h.outputLen);
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anumber(h.blockLen);
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// HMAC and KDF callers treat these as real byte lengths; allowing zero lets fake wrappers pass
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// validation and can produce empty outputs instead of failing fast.
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if (h.outputLen < 1)
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throw new Error('"outputLen" must be >= 1');
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if (h.blockLen < 1)
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throw new Error('"blockLen" must be >= 1');
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}
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/**
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* Asserts a hash instance has not been destroyed or finished.
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* @param instance - hash instance to validate
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* @param checkFinished - whether to reject finalized instances
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* @throws If the hash instance has already been destroyed or finalized. {@link Error}
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* @example
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* Validate that a hash instance is still usable.
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* ```ts
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* import { aexists } from '@noble/hashes/utils.js';
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* import { sha256 } from '@noble/hashes/sha2.js';
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* const hash = sha256.create();
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* aexists(hash);
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* ```
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*/
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export function aexists(instance, checkFinished = true) {
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if (instance.destroyed)
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throw new Error('Hash instance has been destroyed');
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if (checkFinished && instance.finished)
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throw new Error('Hash#digest() has already been called');
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}
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/**
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* Asserts output is a sufficiently-sized byte array.
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* @param out - destination buffer
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* @param instance - hash instance providing output length
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* Oversized buffers are allowed; downstream code only promises to fill the first `outputLen` bytes.
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* @throws On wrong argument types. {@link TypeError}
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* @throws On wrong argument ranges or values. {@link RangeError}
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* @example
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* Validate a caller-provided digest buffer.
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* ```ts
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* import { aoutput } from '@noble/hashes/utils.js';
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* import { sha256 } from '@noble/hashes/sha2.js';
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* const hash = sha256.create();
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* aoutput(new Uint8Array(hash.outputLen), hash);
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* ```
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*/
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export function aoutput(out, instance) {
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abytes(out, undefined, 'digestInto() output');
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const min = instance.outputLen;
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if (out.length < min) {
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throw new RangeError('"digestInto() output" expected to be of length >=' + min);
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}
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}
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/**
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* Casts a typed array view to Uint8Array.
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* @param arr - source typed array
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* @returns Uint8Array view over the same buffer.
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* @example
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* Reinterpret a typed array as bytes.
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* ```ts
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* u8(new Uint32Array([1, 2]));
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* ```
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*/
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export function u8(arr) {
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return new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength);
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}
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/**
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* Casts a typed array view to Uint32Array.
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* `arr.byteOffset` must already be 4-byte aligned or the platform
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* Uint32Array constructor will throw.
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* @param arr - source typed array
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* @returns Uint32Array view over the same buffer.
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* @example
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* Reinterpret a byte array as 32-bit words.
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* ```ts
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* u32(new Uint8Array(8));
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* ```
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*/
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export function u32(arr) {
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return new Uint32Array(arr.buffer, arr.byteOffset, Math.floor(arr.byteLength / 4));
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}
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/**
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* Zeroizes typed arrays in place. Warning: JS provides no guarantees.
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* @param arrays - arrays to overwrite with zeros
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* @example
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* Zeroize sensitive buffers in place.
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* ```ts
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* clean(new Uint8Array([1, 2, 3]));
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* ```
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*/
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export function clean(...arrays) {
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for (let i = 0; i < arrays.length; i++) {
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arrays[i].fill(0);
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}
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}
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/**
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* Creates a DataView for byte-level manipulation.
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* @param arr - source typed array
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* @returns DataView over the same buffer region.
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* @example
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* Create a DataView over an existing buffer.
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* ```ts
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* createView(new Uint8Array(4));
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* ```
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*/
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export function createView(arr) {
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return new DataView(arr.buffer, arr.byteOffset, arr.byteLength);
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}
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/**
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* Rotate-right operation for uint32 values.
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* @param word - source word
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* @param shift - shift amount in bits
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* @returns Rotated word.
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* @example
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* Rotate a 32-bit word to the right.
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* ```ts
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* rotr(0x12345678, 8);
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* ```
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*/
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export function rotr(word, shift) {
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return (word << (32 - shift)) | (word >>> shift);
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}
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/**
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* Rotate-left operation for uint32 values.
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* @param word - source word
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* @param shift - shift amount in bits
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* @returns Rotated word.
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* @example
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* Rotate a 32-bit word to the left.
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* ```ts
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* rotl(0x12345678, 8);
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* ```
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*/
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export function rotl(word, shift) {
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return (word << shift) | ((word >>> (32 - shift)) >>> 0);
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}
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/** Whether the current platform is little-endian. */
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export const isLE = /* @__PURE__ */ (() => new Uint8Array(new Uint32Array([0x11223344]).buffer)[0] === 0x44)();
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/**
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* Byte-swap operation for uint32 values.
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* @param word - source word
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* @returns Word with reversed byte order.
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* @example
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* Reverse the byte order of a 32-bit word.
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* ```ts
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* byteSwap(0x11223344);
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* ```
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*/
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export function byteSwap(word) {
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return (((word << 24) & 0xff000000) |
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((word << 8) & 0xff0000) |
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((word >>> 8) & 0xff00) |
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((word >>> 24) & 0xff));
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}
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/**
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* Conditionally byte-swaps one 32-bit word on big-endian platforms.
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* @param n - source word
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* @returns Original or byte-swapped word depending on platform endianness.
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* @example
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* Normalize a 32-bit word for host endianness.
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* ```ts
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* swap8IfBE(0x11223344);
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* ```
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*/
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export const swap8IfBE = isLE
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? (n) => n
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: (n) => byteSwap(n) >>> 0;
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/**
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* Byte-swaps every word of a Uint32Array in place.
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* @param arr - array to mutate
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* @returns The same array after mutation; callers pass live state arrays here.
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* @example
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* Reverse the byte order of every word in place.
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* ```ts
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* byteSwap32(new Uint32Array([0x11223344]));
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* ```
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*/
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export function byteSwap32(arr) {
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for (let i = 0; i < arr.length; i++) {
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arr[i] = byteSwap(arr[i]);
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}
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return arr;
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}
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/**
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* Conditionally byte-swaps a Uint32Array on big-endian platforms.
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* @param u - array to normalize for host endianness
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* @returns Original or byte-swapped array depending on platform endianness.
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* On big-endian runtimes this mutates `u` in place via `byteSwap32(...)`.
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* @example
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* Normalize a word array for host endianness.
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* ```ts
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* swap32IfBE(new Uint32Array([0x11223344]));
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* ```
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*/
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export const swap32IfBE = isLE
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? (u) => u
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: byteSwap32;
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// Built-in hex conversion https://caniuse.com/mdn-javascript_builtins_uint8array_fromhex
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const hasHexBuiltin = /* @__PURE__ */ (() =>
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// @ts-ignore
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typeof Uint8Array.from([]).toHex === 'function' && typeof Uint8Array.fromHex === 'function')();
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// Array where index 0xf0 (240) is mapped to string 'f0'
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const hexes = /* @__PURE__ */ Array.from({ length: 256 }, (_, i) => i.toString(16).padStart(2, '0'));
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/**
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* Convert byte array to hex string.
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* Uses the built-in function when available and assumes it matches the tested
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* fallback semantics.
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* @param bytes - bytes to encode
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* @returns Lowercase hexadecimal string.
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* @throws On wrong argument types. {@link TypeError}
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* @example
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* Convert bytes to lowercase hexadecimal.
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* ```ts
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* bytesToHex(Uint8Array.from([0xca, 0xfe, 0x01, 0x23])); // 'cafe0123'
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* ```
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*/
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export function bytesToHex(bytes) {
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abytes(bytes);
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// @ts-ignore
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if (hasHexBuiltin)
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return bytes.toHex();
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// pre-caching improves the speed 6x
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let hex = '';
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for (let i = 0; i < bytes.length; i++) {
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hex += hexes[bytes[i]];
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}
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return hex;
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}
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// We use optimized technique to convert hex string to byte array
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const asciis = { _0: 48, _9: 57, A: 65, F: 70, a: 97, f: 102 };
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function asciiToBase16(ch) {
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if (ch >= asciis._0 && ch <= asciis._9)
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return ch - asciis._0; // '2' => 50-48
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if (ch >= asciis.A && ch <= asciis.F)
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return ch - (asciis.A - 10); // 'B' => 66-(65-10)
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if (ch >= asciis.a && ch <= asciis.f)
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return ch - (asciis.a - 10); // 'b' => 98-(97-10)
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return;
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}
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/**
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* Convert hex string to byte array. Uses built-in function, when available.
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* @param hex - hexadecimal string to decode
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* @returns Decoded bytes.
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* @throws On wrong argument types. {@link TypeError}
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* @throws On wrong argument ranges or values. {@link RangeError}
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* @example
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* Decode lowercase hexadecimal into bytes.
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* ```ts
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* hexToBytes('cafe0123'); // Uint8Array.from([0xca, 0xfe, 0x01, 0x23])
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* ```
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*/
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export function hexToBytes(hex) {
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if (typeof hex !== 'string')
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throw new TypeError('hex string expected, got ' + typeof hex);
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if (hasHexBuiltin) {
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try {
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return Uint8Array.fromHex(hex);
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}
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catch (error) {
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if (error instanceof SyntaxError)
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throw new RangeError(error.message);
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throw error;
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}
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}
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const hl = hex.length;
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const al = hl / 2;
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if (hl % 2)
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throw new RangeError('hex string expected, got unpadded hex of length ' + hl);
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const array = new Uint8Array(al);
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for (let ai = 0, hi = 0; ai < al; ai++, hi += 2) {
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const n1 = asciiToBase16(hex.charCodeAt(hi));
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const n2 = asciiToBase16(hex.charCodeAt(hi + 1));
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if (n1 === undefined || n2 === undefined) {
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const char = hex[hi] + hex[hi + 1];
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throw new RangeError('hex string expected, got non-hex character "' + char + '" at index ' + hi);
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}
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array[ai] = n1 * 16 + n2; // multiply first octet, e.g. 'a3' => 10*16+3 => 160 + 3 => 163
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}
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return array;
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}
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/**
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* There is no setImmediate in browser and setTimeout is slow.
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* This yields to the Promise/microtask scheduler queue, not to timers or the
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* full macrotask event loop.
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* @example
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* Yield to the next scheduler tick.
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* ```ts
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* await nextTick();
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* ```
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*/
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export const nextTick = async () => { };
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/**
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* Returns control to the Promise/microtask scheduler every `tick`
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* milliseconds to avoid blocking long loops.
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* @param iters - number of loop iterations to run
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* @param tick - maximum time slice in milliseconds
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* @param cb - callback executed on each iteration
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* @example
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* Run a loop that periodically yields back to the event loop.
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* ```ts
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* await asyncLoop(2, 0, () => {});
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* ```
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*/
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export async function asyncLoop(iters, tick, cb) {
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let ts = Date.now();
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for (let i = 0; i < iters; i++) {
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cb(i);
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// Date.now() is not monotonic, so in case if clock goes backwards we return return control too
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const diff = Date.now() - ts;
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if (diff >= 0 && diff < tick)
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continue;
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await nextTick();
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ts += diff;
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}
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}
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/**
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* Converts string to bytes using UTF8 encoding.
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* Built-in doesn't validate input to be string: we do the check.
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* Non-ASCII details are delegated to the platform `TextEncoder`.
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* @param str - string to encode
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* @returns UTF-8 encoded bytes.
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* @throws On wrong argument types. {@link TypeError}
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* @example
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* Encode a string as UTF-8 bytes.
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* ```ts
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* utf8ToBytes('abc'); // Uint8Array.from([97, 98, 99])
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* ```
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*/
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export function utf8ToBytes(str) {
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if (typeof str !== 'string')
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throw new TypeError('string expected');
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return new Uint8Array(new TextEncoder().encode(str)); // https://bugzil.la/1681809
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}
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/**
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* Helper for KDFs: consumes Uint8Array or string.
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* String inputs are UTF-8 encoded; byte-array inputs stay aliased to the caller buffer.
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* @param data - user-provided KDF input
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* @param errorTitle - label included in thrown errors
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* @returns Byte representation of the input.
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* @throws On wrong argument types. {@link TypeError}
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* @example
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* Normalize KDF input to bytes.
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* ```ts
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* kdfInputToBytes('password');
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* ```
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*/
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export function kdfInputToBytes(data, errorTitle = '') {
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if (typeof data === 'string')
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return utf8ToBytes(data);
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return abytes(data, undefined, errorTitle);
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}
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/**
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* Copies several Uint8Arrays into one.
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* @param arrays - arrays to concatenate
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* @returns Concatenated byte array.
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* @throws On wrong argument types. {@link TypeError}
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* @example
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* Concatenate multiple byte arrays.
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* ```ts
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* concatBytes(new Uint8Array([1]), new Uint8Array([2]));
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* ```
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*/
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export function concatBytes(...arrays) {
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let sum = 0;
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for (let i = 0; i < arrays.length; i++) {
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const a = arrays[i];
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abytes(a);
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sum += a.length;
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}
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const res = new Uint8Array(sum);
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for (let i = 0, pad = 0; i < arrays.length; i++) {
|
|
const a = arrays[i];
|
|
res.set(a, pad);
|
|
pad += a.length;
|
|
}
|
|
return res;
|
|
}
|
|
/**
|
|
* Merges default options and passed options.
|
|
* @param defaults - base option object
|
|
* @param opts - user overrides
|
|
* @returns Merged option object. The merge mutates `defaults` in place.
|
|
* @throws On wrong argument types. {@link TypeError}
|
|
* @example
|
|
* Merge user overrides onto default options.
|
|
* ```ts
|
|
* checkOpts({ dkLen: 32 }, { asyncTick: 10 });
|
|
* ```
|
|
*/
|
|
export function checkOpts(defaults, opts) {
|
|
if (opts !== undefined && {}.toString.call(opts) !== '[object Object]')
|
|
throw new TypeError('options must be object or undefined');
|
|
const merged = Object.assign(defaults, opts);
|
|
return merged;
|
|
}
|
|
/**
|
|
* Creates a callable hash function from a stateful class constructor.
|
|
* @param hashCons - hash constructor or factory
|
|
* @param info - optional metadata such as DER OID
|
|
* @returns Frozen callable hash wrapper with `.create()`.
|
|
* Wrapper construction eagerly calls `hashCons(undefined)` once to read
|
|
* `outputLen` / `blockLen`, so constructor side effects happen at module
|
|
* init time.
|
|
* @example
|
|
* Wrap a stateful hash constructor into a callable helper.
|
|
* ```ts
|
|
* import { createHasher } from '@noble/hashes/utils.js';
|
|
* import { sha256 } from '@noble/hashes/sha2.js';
|
|
* const wrapped = createHasher(sha256.create, { oid: sha256.oid });
|
|
* wrapped(new Uint8Array([1]));
|
|
* ```
|
|
*/
|
|
export function createHasher(hashCons, info = {}) {
|
|
const hashC = (msg, opts) => hashCons(opts)
|
|
.update(msg)
|
|
.digest();
|
|
const tmp = hashCons(undefined);
|
|
hashC.outputLen = tmp.outputLen;
|
|
hashC.blockLen = tmp.blockLen;
|
|
hashC.canXOF = tmp.canXOF;
|
|
hashC.create = (opts) => hashCons(opts);
|
|
Object.assign(hashC, info);
|
|
return Object.freeze(hashC);
|
|
}
|
|
/**
|
|
* Cryptographically secure PRNG backed by `crypto.getRandomValues`.
|
|
* @param bytesLength - number of random bytes to generate
|
|
* @returns Random bytes.
|
|
* The platform `getRandomValues()` implementation still defines any
|
|
* single-call length cap, and this helper rejects oversize requests
|
|
* with a stable library `RangeError` instead of host-specific errors.
|
|
* @throws On wrong argument types. {@link TypeError}
|
|
* @throws On wrong argument ranges or values. {@link RangeError}
|
|
* @throws If the current runtime does not provide `crypto.getRandomValues`. {@link Error}
|
|
* @example
|
|
* Generate a fresh random key or nonce.
|
|
* ```ts
|
|
* const key = randomBytes(16);
|
|
* ```
|
|
*/
|
|
export function randomBytes(bytesLength = 32) {
|
|
// Match the repo's other length-taking helpers instead of relying on Uint8Array coercion.
|
|
anumber(bytesLength, 'bytesLength');
|
|
const cr = typeof globalThis === 'object' ? globalThis.crypto : null;
|
|
if (typeof cr?.getRandomValues !== 'function')
|
|
throw new Error('crypto.getRandomValues must be defined');
|
|
// Web Cryptography API Level 2 ยง10.1.1:
|
|
// if `byteLength > 65536`, throw `QuotaExceededError`.
|
|
// Keep the guard explicit so callers can see the quota in code
|
|
// instead of discovering it by reading the spec or host errors.
|
|
// This wrapper surfaces the same quota as a stable library RangeError.
|
|
if (bytesLength > 65536)
|
|
throw new RangeError(`"bytesLength" expected <= 65536, got ${bytesLength}`);
|
|
return cr.getRandomValues(new Uint8Array(bytesLength));
|
|
}
|
|
/**
|
|
* Creates OID metadata for NIST hashes with prefix `06 09 60 86 48 01 65 03 04 02`.
|
|
* @param suffix - final OID byte for the selected hash.
|
|
* The helper accepts any byte even though only the documented NIST hash
|
|
* suffixes are meaningful downstream.
|
|
* @returns Object containing the DER-encoded OID.
|
|
* @example
|
|
* Build OID metadata for a NIST hash.
|
|
* ```ts
|
|
* oidNist(0x01);
|
|
* ```
|
|
*/
|
|
export const oidNist = (suffix) => ({
|
|
// Current NIST hashAlgs suffixes used here fit in one DER subidentifier octet.
|
|
// Larger suffix values would need base-128 OID encoding and a different length byte.
|
|
oid: Uint8Array.from([0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, suffix]),
|
|
});
|
|
//# sourceMappingURL=utils.js.map
|