The WinTrustProviderVerifyTrust function performs a specified verification action on a specified subject. When an application calls the WinVerifyTrust function, WinTrust calls the WinTrustProviderVerifyTrust function of the trust provider that supports the specified action identifier.
LONG WinTrustProviderVerifyTrust(
HWND hwnd, |
// handle to a window for interacting with the user |
GUID *ActionID, |
// pointer to a trust provider action identifier |
LPVOID ActionData |
// pointer to an action-specific data structure |
); |
Value |
Meaning |
INVALID_HANDLE_VALUE |
There is no interactive user. The trust provider performs the verification operation without the user’s assistance. |
zero |
The trust provider can use the interactive desktop to display its user interface. |
A valid window handle |
The trust provider can assume that any value other than zero or INVALID_HANDLE_VALUE is a valid window handle that it can use to interact with the user. |
If the trust provider verifies that the subject is trusted for the specified action, the return value is ERROR_SUCCESS.
Otherwise, the return value is a status code that indicates the error that occurred. For example, a trust provider might indicate that the subject is not trusted, or is trusted but with limitations or warnings. The return value can be a trust-provider - specific value described in the documentation for an individual trust provider, or it can be one of the following error codes defined in WINERROR.H.
Value |
Meaning |
TRUST_E_SUBJECT_NOT_TRUSTED |
The subject is not trusted for the specified action. Most trust providers return a more detailed error code that describes the reason that the subject is not trusted. |
TRUST_E_ACTION_UNKNOWN |
The trust provider does not support the specified action. |
TRUST_E_SUBJECT_FORM_UNKNOWN |
The trust provider does not support the form specified for the subject. |
Each trust provider DLL must implement the WinTrustProviderVerifyTrust function. WinTrust gets a pointer to the trust provider’s WinTrustProviderVerifyTrust implementation when WinTrust calls the trust provider’s WinTrustProviderClientInitialize initialization function.
A trust provider’s WinTrustProviderVerifyTrust function executes in the process of the application that called the WinVerifyTrust function. The function also executes in the security context of the application.
The LPWINTRUST_PROVIDER_VERIFY_TRUST type is a pointer to a WinTrustProviderVerifyTrust function.
GUID, WinTrustProviderClientInitialize, WinVerifyTrust
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