import { createHmac } from 'node:crypto'

/**
 * Compute HMAC-SHA256 and return Base64-encoded signature.
 *
 * @param key - HMAC key (Buffer)
 * @param data - Data to sign (UTF-8 string)
 * @returns Base64-encoded HMAC-SHA256 signature
 */
export const hmacSha256Base64 = (key: Buffer, data: string): string => {
  return createHmac('sha256', key).update(data, 'utf-8').digest('base64')
}

/**
 * Compute HMAC-SHA256 and return raw Buffer.
 *
 * @param key - HMAC key (Buffer)
 * @param data - Data to sign (UTF-8 string)
 * @returns HMAC-SHA256 digest as Buffer
 */
export const hmacSha256 = (key: Buffer, data: string): Buffer => {
  return createHmac('sha256', key).update(data, 'utf-8').digest()
}