HRESULT 0x800B0001 (TRUST_E_PROVIDER

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Description:

The requested trust provider is not known or registered for the verification operation.

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WINBIO_E_ENROLLMENT_CANCELED_BY_SUSPEND	TRUST_E_ACTION_UNKNOWN

TRUST_E_PROVIDER_UNKNOWN

TRUST_E_PROVIDER_UNKNOWN means that the trust action requested by the caller has no available provider. In WinVerifyTrust-style code, the action GUID and the registered trust provider determine which verification implementation is used.

Verify the trust-provider contract

Log the action GUID and subject type rather than reporting this only as a certificate error.
Check that the required Windows trust provider and its registration are present on the target system.
Avoid substituting an unrelated action GUID merely to make the call succeed; it can validate a different policy.

This result occurs before a normal certificate-chain decision can be made for the requested action.

Microsoft: verifying a PE file signature

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