[The WTHelperGetProvSignerFromChain function is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions. For certificate verification, use the CertGetCertificateChain and CertVerifyCertificateChainPolicy functions. For Microsoft Authenticode technology signature verification, use the .NET Framework.]
The WTHelperGetProvSignerFromChain function retrieves a signer or countersigner by index from the chain. This function has no associated import library. You must use the LoadLibrary and GetProcAddress functions to dynamically link to Wintrust.dll.
CRYPT_PROVIDER_SGNR * WTHelperGetProvSignerFromChain( CRYPT_PROVIDER_DATA *pProvData, DWORD idxSigner, BOOL fCounterSigner, DWORD idxCounterSigner );
A pointer to the CRYPT_PROVIDER_DATA structure that contains the signer and countersigner information.
The index of the signer. The index is zero based.
If TRUE, the countersigner, as specified by idxCounterSigner, is retrieved by this function; the signer that contains the countersigner is identified by idxSigner. If FALSE, the signer, as specified by idxSigner, is retrieved by this function.
The index of the countersigner. The index is zero based. The countersigner applies to the signer identified by idxSigner.
If the function succeeds, the function returns a pointer to a CRYPT_PROVIDER_SGNR structure for the requested signer or countersigner.
If the function fails, it returns NULL.
|Minimum supported client||Windows XP [desktop apps only]|
|Minimum supported server||Windows Server 2003 [desktop apps only]|