tornadocontrib/noble-curves
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Paul Miller 2023-02-26 18:10:50 +00:00
parent b8b2e91f74
commit 3e90930e9d
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2 changed files with 7 additions and 6 deletions
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2
README.md
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@ -472,7 +472,7 @@ const x25519 = montgomery({
The module allows to hash arbitrary strings to elliptic curve points. Implements [hash-to-curve v16](https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-16).
Every curve has exported `hashToCurve` and `encodeToCurve` methods:
Every curve has exported `hashToCurve` and `encodeToCurve` methods. You should always prefer `hashToCurve` for security:
```ts
import { hashToCurve, encodeToCurve } from '@noble/curves/secp256k1';

11
src/abstract/hash-to-curve.ts
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@ -11,8 +11,9 @@ import { bytesToNumberBE, CHash, concatBytes, utf8ToBytes, validateObject } from
* * `expand` is `xmd` (SHA2, SHA3, BLAKE) or `xof` (SHAKE, BLAKE-XOF)
* * `hash` conforming to `utils.CHash` interface, with `outputLen` / `blockLen` props
*/
type UnicodeOrBytes = string | Uint8Array;
export type Opts = {
DST: string | Uint8Array;
DST: UnicodeOrBytes;
p: bigint;
m: number;
k: number;
@ -20,7 +21,7 @@ export type Opts = {
hash: CHash;
};
function validateDST(dst: string | Uint8Array): Uint8Array {
function validateDST(dst: UnicodeOrBytes): Uint8Array {
if (dst instanceof Uint8Array) return dst;
if (typeof dst === 'string') return utf8ToBytes(dst);
throw new Error('DST must be Uint8Array or string');
@ -183,12 +184,12 @@ export type MapToCurve<T> = (scalar: bigint[]) => AffinePoint<T>;
// Separated from initialization opts, so users won't accidentally change per-curve parameters
// (changing DST is ok!)
export type htfBasicOpts = { DST: string };
export type htfBasicOpts = { DST: UnicodeOrBytes };
export function createHasher<T>(
Point: H2CPointConstructor<T>,
mapToCurve: MapToCurve<T>,
def: Opts & { encodeDST?: string }
def: Opts & { encodeDST?: UnicodeOrBytes }
) {
validateObject(def, {
DST: 'string',
@ -200,7 +201,7 @@ export function createHasher<T>(
if (typeof mapToCurve !== 'function') throw new Error('mapToCurve() must be defined');
return {
// Encodes byte string to elliptic curve
// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-11#section-3
// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-16#section-3
hashToCurve(msg: Uint8Array, options?: htfBasicOpts) {
const u = hash_to_field(msg, 2, { ...def, DST: def.DST, ...options } as Opts);
const u0 = Point.fromAffine(mapToCurve(u[0]));