@polkadot/util-crypto/ed25519/verify.js

// Copyright 2017-2023 @polkadot/util-crypto authors & contributors
// SPDX-License-Identifier: Apache-2.0

import nacl from 'tweetnacl';
import { u8aToU8a } from '@polkadot/util';
import { ed25519Verify as wasmVerify, isReady } from '@polkadot/wasm-crypto';

/**
 * @name ed25519Sign
 * @summary Verifies the signature on the supplied message.
 * @description
 * Verifies the `signature` on `message` with the supplied `publicKey`. Returns `true` on sucess, `false` otherwise.
 * @example
 * <BR>
 *
 * ```javascript
 * import { ed25519Verify } from '@polkadot/util-crypto';
 *
 * ed25519Verify([...], [...], [...]); // => true/false
 * ```
 */
export function ed25519Verify(message, signature, publicKey, onlyJs) {
  const messageU8a = u8aToU8a(message);
  const publicKeyU8a = u8aToU8a(publicKey);
  const signatureU8a = u8aToU8a(signature);
  if (publicKeyU8a.length !== 32) {
    throw new Error(`Invalid publicKey, received ${publicKeyU8a.length}, expected 32`);
  } else if (signatureU8a.length !== 64) {
    throw new Error(`Invalid signature, received ${signatureU8a.length} bytes, expected 64`);
  }
  return !onlyJs && isReady() ? wasmVerify(signatureU8a, messageU8a, publicKeyU8a) : nacl.sign.detached.verify(messageU8a, signatureU8a, publicKeyU8a);
}