CalcHMAC_SHA512

function CalcHMAC_SHA512(

  const Key: Pointer;

  const KeySize: Int32;

  const Buf;

  const BufSize: NativeInt

):T512BitDigest; overload;

function CalcHMAC_SHA512(

  const Key: RawByteString;

  const Buf;

  const BufSize: NativeInt

):T512BitDigest; overload;

function CalcHMAC_SHA512(

  const Key: RawByteString;

  const Buf: RawByteString

):T512BitDigest; overload;