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DIGSIG_E_ENCODE
DIGSIG_E_ENCODE should be read at the ASN.1 construction of signed data boundary. The digital-signature component could not serialize the requested signer, attributes, algorithm identifiers, extensions, or content into the expected ASN.1 structure. For ASN.1 construction of signed data, 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.”
Read the failure at the correct layer
The failure occurs while constructing an ASN.1 representation for signed content., separate the application object model from the bytes sent to the encoder: signer identifiers, algorithms, signed and unsigned attributes, extensions, content type, and length constraints all affect the resulting structure.
Build an incident record
| Record | Why it matters for this code |
|---|---|
| top-level signed-data type and every populated signer or attribute collection | Locates the failure in representation, object placement, or cryptographic execution. |
| algorithm identifiers and parameters plus encoded content length | Keeps ASN.1 syntax separate from certificate-chain policy. |
| the first field or collection added before encoding begins to fail | Produces a minimal signed-data case that another implementation can inspect. |
Code-specific checks:
- Identify the exact structure and encoding API that failed.
- Validate OIDs, lengths, attribute multiplicity, and required fields before encoding.
- Compare generated structures with the CMS and X.509 profiles used by the consumer.
What to include in an escalation package
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 in an ASN.1 construction of signed data investigation. A final “signature invalid” message cannot recover that boundary after intermediate statuses are discarded.
- In the 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.
- Independent ASN.1 and signature observations using the exact original bytes.
Use two comparison axes
Encode a minimal signed-data object with one signer and no optional attributes, decode it independently, then add production attributes one at a time. This localizes the field that violates the encoder contract.
- Preserve the original input, identity, provider or protocol selection, and first return Value.
- Use one known-good control that changes only the suspected part of the ASN.1 construction of signed data path.
- reverse the comparison with known-good input on the failing layer where that can be done safely.
- Record where behavior first diverges in the ASN.1 construction of signed data path instead of judging only by the final application message.
Do not collapse it into a neighboring code
The cryptographic key may be healthy; encoding fails before or around construction of the signed representation. Changing signature algorithms while also removing attributes makes the successful result impossible to attribute to one correction in an ASN.1 construction of signed data investigation.
For ASN.1 construction of signed 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.
Verification after the change
The production object must encode deterministically and decode as the intended CMS or related structure in an independent implementation. 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 ASN.1 construction of signed 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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