CalcHMAC_SHA256

function CalcHMAC_SHA256(

  const Key: Pointer;

  const KeySize: Int32;

  const Buf;

  const BufSize: NativeInt

):T256BitDigest; overload;

function CalcHMAC_SHA256(

  const Key: RawByteString;

  const Buf;

  const BufSize: NativeInt

):T256BitDigest; overload;

function CalcHMAC_SHA256(

  const Key: RawByteString;

  const Buf: RawByteString

):T256BitDigest; overload;