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NTE_DECRYPTION_FAILURE
NTE_DECRYPTION_FAILURE should be read at the decryption or unwrap validation boundary. The provider could not recover valid plaintext or key material using the supplied key, ciphertext, IV, nonce, padding, tag, or wrapping parameters. The useful diagnostic question is which concrete object and operation caused Windows to select this exact HRESULT—not whether a key, certificate, account, file, or device merely “works.”
Where the status is selected
The failure occurs after a cryptographic operation has enough context to process key material and data in a decryption or unwrap validation investigation. Preserve the exact algorithm, mode, padding, key version, nonce or IV, authentication tag, associated data, input bytes, and output contract. A high-level “encrypt” or “verify” label is not sufficient to reproduce the operation.
Evidence that changes the diagnosis
| Record | Why it matters for this code |
|---|---|
| Algorithm and provider identifiers plus key identity and usage policy | Makes the cryptographic operation reproducible without logging secrets. |
| Ciphertext or message bytes, mode, padding, IV or nonce, tag, and associated-data boundaries | Separates malformed or mismatched data from provider execution. |
| The first provider return before a wrapper translates it into a general security exception | Preserves the lower-level result that wrappers often hide. |
Code-specific checks:
- Verify that encryption and decryption use the same algorithm identifier, mode, padding, nonce/IV, associated data, and key version.
- Preserve ciphertext bytes before text conversion, transport decoding, or container extraction.
- For authenticated encryption, log tag length and associated-data boundaries without logging secrets.
Preserve the evidence chain
- a minimal reproducer that names the API, provider, key or container, flags, and nonsecret input sizes.
- In the path, provider, device, profile, and operating-system event records covering the last success and first failure.
- In the path, a known-good control result produced under the same identity, architecture, and provider selection.
A controlled way to reproduce it
Use a published or internally fixed known-answer vector with the same primitive, then process the production input with a known-good key and provider where policy permits in this condition investigation. The two directions separate an implementation or parameter problem from damaged or mismatched data.
| Test | Interpretation |
|---|---|
| Same input, known-good path | Success moves attention toward the selected provider, policy, device, context, or transaction state. |
| Known-good input, failing path | Failure suggests that the environment or selected object is independently unable to perform the operation. |
| Original path after one isolated change | This comparison demonstrates whether the proposed correction addresses the original condition. |
Nearby results and misleading fixes
This result is not evidence that increasing permissions will help. It usually indicates cryptographic mismatch, damaged input, or authentication failure., repeatedly trying alternate passwords, padding modes, or keys against protected data can trigger lockout and also obscures which parameter set produced each result. Label every controlled attempt in this condition investigation.
Also retain the original numeric value; neighboring constants can encode materially different remediation paths even when an application presents all of them as an authentication, certificate, or security failure.
What counts as a real resolution
In the path, verification must succeed for the intended key and protocol parameters, and a deliberately altered input must still fail. That positive-and-negative pair proves more than one successful retry in this condition investigation. Keep a regression case that uses nonsecret identifiers and expected outcomes, including one negative control that must continue to fail.
Technical references
These sources define the HRESULT and the relevant relevant interface, protocol, or data format.
- Microsoft Open Specifications: HRESULT values.
- Microsoft: NCryptDecrypt.
- NIST SP 800-38D: GCM and GMAC.
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