What does HRESULT 0x80098054 (WINBIO_E_KEY_IDENTIFIER_BUFFER_TOO_SMALL) mean?

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the secure key identifier output buffer is too small.

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WINBIO_E_KEY_CREATION_FAILED	WINBIO_E_PROPERTY_UNAVAILABLE

WINBIO_E_KEY_IDENTIFIER_BUFFER_TOO_SMALL

WINBIO_E_KEY_IDENTIFIER_BUFFER_TOO_SMALL is a buffer-sizing result from the secure key creation contract. EngineAdapterCreateKey receives a caller-provided key-identifier buffer, its size, and a ResultSize output so the adapter can report how many bytes are required or produced.

Treat ResultSize as part of the API contract

Record the supplied KeyIdentifierSize and returned ResultSize.
Allocate according to the required size and repeat the key-creation step only through the documented provisioning flow.
Do not truncate the identifier or assume a fixed GUID-sized value; the identifier is adapter-defined opaque data.

The returned identifier is later passed back with its explicit size to EngineAdapterIdentifyFeatureSetSecure. Truncating or serializing it into a smaller application field can therefore turn a sizing bug into WINBIO_E_INVALID_KEY_IDENTIFIER during authentication. Keep the identifier and byte count together and preserve them as opaque framework/sensor state.

EngineAdapterCreateKey · Secure identify callback · Secure sensor requirements

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