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FVE_E_PASSPHRASE_TOO_LONG
Where the operation stops
The value 0x803100AA, named FVE_E_PASSPHRASE_TOO_LONG, is returned when the proposed BitLocker password exceeds the maximum supported length of the protector interface. It belongs to the key-protector lifecycle part of BitLocker rather than to generic file I/O.
Never capture PINs, passwords or recovery passwords in logs. IDs, types, policy, call result and attempt counters are sufficient for most diagnosis. A BitLocker key protector wraps access to the volume master key. TPM, TPM+PIN, startup key, recovery password, password, certificate and Network Unlock protectors have different volume and policy rules; changing one is not the same as decrypting the volume.
| Question | What to verify |
|---|---|
| Which object failed? | The exact volume GUID, protector GUID, certificate or API target supplied by the caller. |
| Which state matters? | character count, encoding path, UI versus API call, drive type and effective password policy without collecting the secret. |
| What is the nearest false lead? | a password rejected for simplicity, FIPS policy or unsupported OS-volume use. |
Build a minimal diagnostic record
- Record character count, encoding path, UI versus API call, drive type and effective password policy without collecting the secret.
Change only the failed prerequisite
choose a compliant password at or below the documented limit and verify the calling application is not adding hidden characters.
manage-bde -protectors -get C:
powershell -NoProfile -Command "Get-BitLockerVolume C: | Format-List KeyProtector,ProtectionStatus,VolumeStatus"Count the value delivered to the API
Applications can add hidden carriage returns, nulls or normalization changes when a password is copied from a vault or text control. Measure the character sequence passed to the BitLocker provider without logging its content. The visible number of characters in a UI can differ from the actual BSTR or PowerShell string length.
Shorten the secret within policy and interface limits, then test one controlled add or change operation. Repeated submissions do not improve a length violation and can trigger separate throttling.
State checks specific to FVE_E_PASSPHRASE_TOO_LONG
| Stage | How to interpret it |
|---|---|
| Before the call | Record the target identity and the pre-call key-protector lifecycle state. The proposed BitLocker password exceeds the maximum supported length of the protector interface. |
| At failure | Preserve character count, encoding path, UI versus API call, drive type and effective password policy without collecting the secret. This proves whether this result came from BitLocker itself or from a wrapper translating another result. |
| After correction | Choose a compliant password at or below the documented limit and verify the calling application is not adding hidden characters. |
Official documentation
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