polkadot-js/common

// Copyright 2017-2024 @polkadot/util-crypto authors & contributors
// SPDX-License-Identifier: Apache-2.0

import type { Keypair } from '../types.js';

import { ed25519 } from '@noble/curves/ed25519';

import { hasBigInt, u8aToU8a } from '@polkadot/util';
import { ed25519Sign as wasmSign, isReady } from '@polkadot/wasm-crypto';

/**
 * @name ed25519Sign
 * @summary Signs a message using the supplied secretKey
 * @description
 * Returns message signature of `message`, using the `secretKey`.
 * @example
 * <BR>
 *
 * ```javascript
 * import { ed25519Sign } from '@polkadot/util-crypto';
 *
 * ed25519Sign([...], [...]); // => [...]
 * ```
 */
export function ed25519Sign (message: string | Uint8Array, { publicKey, secretKey }: Partial<Keypair>, onlyJs?: boolean): Uint8Array {
  if (!secretKey) {
    throw new Error('Expected a valid secretKey');
  } else if (!publicKey) {
    throw new Error('Expected a valid publicKey');
  }

  const messageU8a = u8aToU8a(message);
  const privateU8a = secretKey.subarray(0, 32);

  return !hasBigInt || (!onlyJs && isReady())
    ? wasmSign(publicKey, privateU8a, messageU8a)
    : ed25519.sign(messageU8a, privateU8a);
}