otplib API Documentation / @otplib/hotp / verifySync

Function: verifySync()

verifySync(options): VerifyResult

Defined in: hotp/src/index.ts:362

Verify an HOTP code synchronously

This is the synchronous version of verify. It requires a crypto plugin that supports synchronous HMAC operations (e.g., NodeCryptoPlugin or NobleCryptoPlugin). Using this with WebCryptoPlugin will throw an error.

Parameters

options

HOTPVerifyOptions

HOTP verification options

Returns

VerifyResult

Verification result with validity and optional delta

See

• verify for the async version
• RFC 4226 Section 7.2

Throws

If the algorithm is invalid or unsupported by the plugin

Throws

If HMAC computation fails or the plugin does not support sync operations

Example

import { verifySync } from '@otplib/hotp';
import { NodeCryptoPlugin } from '@otplib/plugin-crypto-node';

const result = verifySync({
  secret: new Uint8Array([1, 2, 3, 4, 5]),
  counter: 0,
  token: '123456',
  crypto: new NodeCryptoPlugin(),
});
// Returns: { valid: true, delta: 0 }