Function dynamicTruncation

dynamicTruncation(hmacArray: Uint8Array, digits: OtpDigits): string
Perform dynamic truncation on HMAC result according to RFC 4226
Parameters
- hmacArray: Uint8Array
  HMAC result as byte array (minimum 20 bytes)
- digits: OtpDigits
  Number of digits in the final code (6 or 8)
Returns string
Truncated code as string with leading zeros

Throws
(InternalError) - if HMAC array is too short or digits is invalid
- Defined in utils/dynamic-truncation.ts:27