Closes the AEAD context and destroys the key (in incremental mode).
Public Declare Function AEAD_Destroy Lib "diCryptoSys.dll" (ByVal hContext As Long) As Long
nRet = AEAD_Destroy(hContext)
long __stdcall AEAD_Destroy(long hContext);
AEAD_InitKey
.If successful, the return value is zero; otherwise it returns a nonnegative error code.