tornado-packages/noble-curves
1
0
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

utils: make isBytes more resilient in weird envs, improve concatBytes type error resilience.

Browse Source
This commit is contained in:
Paul Miller 2023-12-10 22:00:49 +00:00
parent 008958364e
commit 4ffb68853d
No known key found for this signature in database
GPG Key ID: 697079DA6878B89B
1 changed files with 20 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/abstract/utils.ts
View File

@ -6,7 +6,6 @@
const _0n = BigInt(0);
const _1n = BigInt(1);
const _2n = BigInt(2);
const u8a = (a: any): a is Uint8Array => a instanceof Uint8Array;
export type Hex = Uint8Array | string; // hex strings are accepted for simplicity
export type PrivKey = Hex | bigint; // bigints are accepted to ease learning curve
export type CHash = {
@ -17,6 +16,10 @@ export type CHash = {
};
export type FHash = (message: Uint8Array | string) => Uint8Array;
function isBytes(a: any): a is Uint8Array {
return a instanceof Uint8Array || a.constructor.name === 'Uint8Array';
}
const hexes = /* @__PURE__ */ Array.from({ length: 256 }, (_, i) =>
i.toString(16).padStart(2, '0')
);
@ -24,7 +27,7 @@ const hexes = /* @__PURE__ */ Array.from({ length: 256 }, (_, i) =>
* @example bytesToHex(Uint8Array.from([0xca, 0xfe, 0x01, 0x23])) // 'cafe0123'
*/
export function bytesToHex(bytes: Uint8Array): string {
if (!u8a(bytes)) throw new Error('Uint8Array expected');
if (!isBytes(bytes)) throw new Error('Uint8Array expected');
// pre-caching improves the speed 6x
let hex = '';
for (let i = 0; i < bytes.length; i++) {
@ -79,7 +82,7 @@ export function bytesToNumberBE(bytes: Uint8Array): bigint {
return hexToNumber(bytesToHex(bytes));
}
export function bytesToNumberLE(bytes: Uint8Array): bigint {
if (!u8a(bytes)) throw new Error('Uint8Array expected');
if (!isBytes(bytes)) throw new Error('Uint8Array expected');
return hexToNumber(bytesToHex(Uint8Array.from(bytes).reverse()));
}
@ -111,7 +114,7 @@ export function ensureBytes(title: string, hex: Hex, expectedLength?: number): U
} catch (e) {
throw new Error(`${title} must be valid hex string, got "${hex}". Cause: ${e}`);
}
} else if (u8a(hex)) {
} else if (isBytes(hex)) {
// Uint8Array.from() instead of hash.slice() because node.js Buffer
// is instance of Uint8Array, and its slice() creates **mutable** copy
res = Uint8Array.from(hex);
@ -128,14 +131,20 @@ export function ensureBytes(title: string, hex: Hex, expectedLength?: number): U
* Copies several Uint8Arrays into one.
*/
export function concatBytes(...arrays: Uint8Array[]): Uint8Array {
const r = new Uint8Array(arrays.reduce((sum, a) => sum + a.length, 0));
let pad = 0; // walk through each item, ensure they have proper type
arrays.forEach((a) => {
if (!u8a(a)) throw new Error('Uint8Array expected');
r.set(a, pad);
let sum = 0;
for (let i = 0; i < arrays.length; i++) {
const a = arrays[i];
if (!isBytes(a)) throw new Error('Uint8Array expected');
sum += a.length;
}
let res = new Uint8Array(sum);
let pad = 0;
for (let i = 0; i < arrays.length; i++) {
const a = arrays[i];
res.set(a, pad);
pad += a.length;
});
return r;
}
return res;
}
export function equalBytes(b1: Uint8Array, b2: Uint8Array) {