MemorySize attribute missing on BCryptGenerateSymmetricKey

[kennykerr]

Looks like another SAL annotation parsing issue. The function is declared as follows:

_Must_inspect_result_
NTSTATUS
WINAPI
BCryptGenerateSymmetricKey(
    _Inout_                             BCRYPT_ALG_HANDLE   hAlgorithm,
    _Out_                               BCRYPT_KEY_HANDLE   *phKey,
    _Out_writes_bytes_all_opt_(cbKeyObject)  PUCHAR   pbKeyObject,
    _In_                                ULONG   cbKeyObject,
    _In_reads_bytes_(cbSecret)               PUCHAR   pbSecret,
    _In_                                ULONG   cbSecret,
    _In_                                ULONG   dwFlags);

But the expected MemorySize attribute is missing from the pbKeyObject parameter:

[DllImport("bcrypt", ExactSpelling = true, PreserveSig = false)]
[SupportedOSPlatform("windows6.0.6000")]
public unsafe static extern NTSTATUS BCryptGenerateSymmetricKey([In] BCRYPT_ALG_HANDLE hAlgorithm, [Out] BCRYPT_KEY_HANDLE* phKey, [Optional][Out] byte* pbKeyObject, [In] uint cbKeyObject, [In][MemorySize(BytesParamIndex = 5)] byte* pbSecret, [In] uint cbSecret, [In] uint dwFlags);