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SEC_I_SIGNATURE_NEEDED
Authentication requires a signature operation
SEC_I_SIGNATURE_NEEDED is HRESULT 590684 (0x0009035C) from winerror.h. AllStat describes it as “A signature operation must be performed before the user can authenticate.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.
In the SSPI authentication or message-protection state machine, this result means that a signature operation must be performed before the user can authenticate. Ordinary completion must not be inferred from it until the owning component’s state and outputs agree.
Where the status is encountered
- InitializeSecurityContext or AcceptSecurityContext loops; log the exact method and object state instead of interpreting the constant outside that contract.
- Schannel or another security package; log the exact method and object state instead of interpreting the constant outside that contract.
- Message signing, fragmentation, or asynchronous SSPI processing; log the exact method and object state instead of interpreting the constant outside that contract.
Because it is informational, a language binding may expose it as success and hide the symbolic distinction. Keep the original HRESULT available until the code-specific branch has run.
Evidence and telemetry
- preserve challenge bytes or hash.
- preserve context attributes.
- preserve signature buffer sizes.
- preserve sequence number.
- preserve next protocol message.
Also record sec_i_signature_needed_operation, sec_i_signature_needed_state_before, sec_i_signature_needed_state_after, UTC time, process and thread identifiers, component version, and a correlation ID. For privacy-safe it diagnostics, log metadata and fingerprints instead of confidential source values.
What must be true before accepting it
Verify that the required data is signed with the negotiated context and the signed token is returned through the protocol in the correct order. Only this contract check establishes that it is safe for the caller’s next step.
The return of it can follow observable side effects, so recovery begins with state reconciliation.
Correct handling and recovery
Perform the documented signing step, preserve sequence numbers and buffers, then continue authentication. Do not treat the status as terminal success.
Retry it only when a documented input or state has changed. Before another call following it, confirm that completed side effects are idempotent or reconciled.
Difference from nearby results
It must be distinguished from ordinary S_OK and from failure-severity values in the same API family; its documented state changes control the next action.
A nearby HRESULT can change object ownership, output validity, or the permitted next method.
Practical scenario
A peer completes preliminary authentication but must sign a challenge. It signs the exact challenge bytes with the negotiated context and sends the resulting token before granting access.
A regression test should reproduce it, assert the relevant outputs and state, then change only the decisive condition and verify the expected neighboring result or ordinary completion.
References
- Microsoft: SSPI status codes — official Microsoft material used to interpret it.
- Microsoft: SSPI context semantics
- Microsoft: InitializeSecurityContext
- Microsoft: DecryptMessage
- Microsoft: HRESULT values
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