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DIGSIG_E_CRYPTO
DIGSIG_E_CRYPTO should be read at the cryptographic stage of digital signing boundary. The signature workflow reached a cryptographic primitive or private-key operation that failed without a more specific public digital-signature code. For cryptographic stage of digital signing, 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.”
Locate the first failing boundary
For DIGSIG_E_CRYPTO, ASN.1 construction has progressed far enough to reach a cryptographic primitive or private-key operation. Capture the exact digest and signature algorithms, key provider and key identity, padding parameters, hash bytes, and the nested provider error when DIGSIG_E_CRYPTO is returned.
Useful observations, not generic logs
| Record | Why it matters for this code |
|---|---|
| digest algorithm, signature algorithm, parameters, and data hash | Locates the failure in representation, object placement, or cryptographic execution when DIGSIG_E_CRYPTO is returned. |
| private-key provider, key identifier, usage policy, and accessibility under the caller | Keeps ASN.1 syntax separate from certificate-chain policy when DIGSIG_E_CRYPTO is returned. |
| the lower-level NTE or provider status returned by the sign or verify primitive | Produces a minimal signed-data case that another implementation can inspect when DIGSIG_E_CRYPTO is returned. |
Code-specific checks:
- Record provider, key identifier, digest algorithm, signature algorithm, padding, and data hash.
- Test private-key access and signing with a minimal known message.
- Inspect the nested NTE or provider-specific failure before changing certificate-chain settings.
Correlate the failure with state changes
For DIGSIG_E_CRYPTO, record the transition from application objects to ASN.1 bytes and then to cryptographic execution. In the DIGSIG_E_CRYPTO path, the first failing stage determines whether to inspect field placement, encoder input, decoder bytes, algorithm parameters, or private-key access. A final “signature invalid” message cannot recover that boundary after intermediate statuses are discarded in a cryptographic stage of digital signing investigation.
- In the DIGSIG_E_CRYPTO 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_CRYPTO is returned.
- Independent ASN.1 and signature observations using the exact original bytes when DIGSIG_E_CRYPTO is returned.
Reproduction without destructive cleanup
In the DIGSIG_E_CRYPTO path, sign a fixed small message with the same key and algorithm, then verify it independently. Separately run the production data hash through a known-good key where policy permits in a cryptographic stage of digital signing investigation. For DIGSIG_E_CRYPTO, the controls distinguish key execution from data preparation.
| Test | Interpretation |
|---|---|
| Same input, known-good path | For cryptographic stage of digital signing, success moves attention toward the selected provider, policy, device, context, or transaction state. |
| Known-good input, failing path | For cryptographic stage of digital signing, failure suggests that the environment or selected object is independently unable to perform the operation. |
| Original path after one isolated change | For cryptographic stage of digital signing, this comparison demonstrates whether the proposed correction addresses the original condition. |
How this differs from similar failures
This code points to key/algorithm execution, whereas DIGSIG_E_ENCODE and DIGSIG_E_DECODE point to ASN.1 representation. For DIGSIG_E_CRYPTO, changing certificate-chain settings cannot repair a provider that cannot access the private key or perform the requested signature primitive.
For cryptographic stage of digital signing, 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.
Regression check
For DIGSIG_E_CRYPTO, the intended key must produce or verify the correct signature for the production algorithm, and the resulting signed object must still pass ASN.1 and trust processing. For DIGSIG_E_CRYPTO, 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_CRYPTO, these sources define the HRESULT and the relevant cryptographic stage of digital signing 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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