/*! noble-curves - MIT License (c) 2022 Paul Miller (paulmillr.com) */
import type { AffinePoint, Group, GroupConstructor } from './curve.js';
import { IField } from './modular.js';
import type { CHash } from './utils.js';
/**
* * `DST` is a domain separation tag, defined in section 2.2.5
* * `p` characteristic of F, where F is a finite field of characteristic p and order q = p^m
* * `m` is extension degree (1 for prime fields)
* * `k` is the target security target in bits (e.g. 128), from section 5.1
* * `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: UnicodeOrBytes;
p: bigint;
m: number;
k: number;
expand: 'xmd' | 'xof';
hash: CHash;
};
export declare function expand_message_xmd(msg: Uint8Array, DST: Uint8Array, lenInBytes: number, H: CHash): Uint8Array;
export declare function expand_message_xof(msg: Uint8Array, DST: Uint8Array, lenInBytes: number, k: number, H: CHash): Uint8Array;
/**
* Hashes arbitrary-length byte strings to a list of one or more elements of a finite field F
* https://www.rfc-editor.org/rfc/rfc9380#section-5.2
* @param msg a byte string containing the message to hash
* @param count the number of elements of F to output
* @param options `{DST: string, p: bigint, m: number, k: number, expand: 'xmd' | 'xof', hash: H}`, see above
* @returns [u_0, ..., u_(count - 1)], a list of field elements.
*/
export declare function hash_to_field(msg: Uint8Array, count: number, options: Opts): bigint[][];
export declare function isogenyMap>(field: F, map: [T[], T[], T[], T[]]): (x: T, y: T) => {
x: T;
y: T;
};
export interface H2CPoint extends Group> {
add(rhs: H2CPoint): H2CPoint;
toAffine(iz?: bigint): AffinePoint;
clearCofactor(): H2CPoint;
assertValidity(): void;
}
export interface H2CPointConstructor extends GroupConstructor> {
fromAffine(ap: AffinePoint): H2CPoint;
}
export type MapToCurve = (scalar: bigint[]) => AffinePoint;
export type htfBasicOpts = {
DST: UnicodeOrBytes;
};
export declare function createHasher(Point: H2CPointConstructor, mapToCurve: MapToCurve, def: Opts & {
encodeDST?: UnicodeOrBytes;
}): {
hashToCurve(msg: Uint8Array, options?: htfBasicOpts): H2CPoint;
encodeToCurve(msg: Uint8Array, options?: htfBasicOpts): H2CPoint;
mapToCurve(scalars: bigint[]): H2CPoint;
};
export {};
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