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DIGSIG_E_DECODE
The important part of DIGSIG_E_DECODE is its scope: ASN.1 parsing of signature data. The signature component could not decode the CMS, certificate, algorithm, attribute, or extension structure needed for verification. Keep the hexadecimal value 0x800B0006 with the returning API, because higher-level software may translate it into a message that loses this distinction.
Start with the returning API
For DIGSIG_E_DECODE, the failure occurs while turning signature bytes into ASN.1 objects needed by the digital-signature layer. Preserve the original binary data, outer content type, DER or BER expectations, total length, and the first nested object the caller expected when DIGSIG_E_DECODE is returned.
Diagnostic evidence matrix
- 1. Unaltered signature or CMS bytes and transport decoding steps
Preserve the original binary object and distinguish DER/BER bytes from PEM or base64 wrappers. - 2. Outer tag, content type OID, signer count, and algorithm identifiers
Locate the first failing ASN.1 offset with an independent decoder. - 3. Independent decoder result and the first offset or field where structure diverges
Check whether the declared container type matches the actual signed object.
For ASN.1 parsing of signature data, these observations are deliberately nonsecret: identifiers, lengths, provider names, policy selections, and state transitions usually support comparison without recording private keys, passwords, PINs, or plaintext.
Preserve the evidence chain
For DIGSIG_E_DECODE, record the transition from application objects to ASN.1 bytes and then to cryptographic execution. The first failing stage determines whether to inspect field placement, encoder input, decoder bytes, algorithm parameters, or private-key access when DIGSIG_E_DECODE is returned. In the DIGSIG_E_DECODE path, a final “signature invalid” message cannot recover that boundary after intermediate statuses are discarded.
- In the DIGSIG_E_DECODE path, minimal object model and encoded bytes with the first optional field that changes the result.
- Digest and signature algorithms, key provider, and lower-level provider status where applicable when DIGSIG_E_DECODE is returned.
- Independent ASN.1 and signature observations using the exact original bytes when DIGSIG_E_DECODE is returned.
Minimal test sequence
Decode a known-good signature produced by the same workflow, then decode the failing bytes without attempting trust validation in an ASN.1 parsing of signature data investigation. For DIGSIG_E_DECODE, this keeps syntax and object selection separate from certificate-chain policy.
| Test | Interpretation |
|---|---|
| Same input, known-good path | For ASN.1 parsing of signature data, success moves attention toward the selected provider, policy, device, context, or transaction state. |
| Known-good input, failing path | For ASN.1 parsing of signature data, failure suggests that the environment or selected object is independently unable to perform the operation. |
| Original path after one isolated change | For ASN.1 parsing of signature data, this comparison demonstrates whether the proposed correction addresses the original condition. |
Boundaries of this HRESULT
A decoding failure occurs before a mathematical signature verdict can be trusted. For DIGSIG_E_DECODE, importing certificates cannot repair malformed ASN.1, and re-encoding unknown bytes can remove evidence of the producer defect.
For ASN.1 parsing of signature data, keep representation, cryptographic execution, and trust evaluation separate. In this path, a byte sequence can decode correctly and still fail signature policy, while no chain repair can make malformed ASN.1 decode.
Closure criteria
For DIGSIG_E_DECODE, the original bytes must decode into the expected object model before signature and trust checks are considered. For DIGSIG_E_DECODE, keep a regression case that uses nonsecret identifiers and expected outcomes, including one negative control that must continue to fail.
Technical references
For DIGSIG_E_DECODE, these sources define the HRESULT and the relevant ASN.1 parsing of signature data interface, protocol, or data format.
- Microsoft Open Specifications: HRESULT values.
- ITU-T X.690: BER, CER and DER.
- RFC 5652: Cryptographic Message Syntax.
- Microsoft: Wintrust API.
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