What does HRESULT 0x80093134 (CRYPT_E_ASN1_NYI) mean?

 
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CRYPT_E_ASN1_PDU_TYPE CRYPT_E_ASN1_EXTENDED

CRYPT_E_ASN1_NYI

CRYPT_E_ASN1_NYI identifies a failure in unsupported ASN.1 codec feature. The selected Windows ASN.1 codec path recognizes the requested operation or type but does not implement that feature or encoding combination. Diagnose unsupported ASN.1 codec feature at the first component that returned the value, not the last user-interface layer that displayed it; later cleanup and fallback attempts can produce different secondary errors.

Locate the first failing boundary

Windows has already entered an ASN.1 encode or decode path in an unsupported ASN.1 codec feature investigation. For CRYPT_E_ASN1_NYI, preserve the exact structure type or encoding identifier, binary input, byte length, flags, allocator behavior, and nested status. PEM text, base64 decoding, transport framing, and ASN.1 parsing are separate stages when CRYPT_E_ASN1_NYI is returned.

Useful observations, not generic logs

  • Encoding type and structure identifier passed to the Windows codec
    Identify the exact ASN.1 type, encoding rule, and API structure identifier.
    Locates the first cryptographic or representation boundary that fails when CRYPT_E_ASN1_NYI is returned.
  • Unaltered input bytes, total length, and first failing offset when available
    Check whether the input uses BER flexibility while the consumer expects DER or a narrower profile.
    Separates object identity and binary structure from later trust policy when CRYPT_E_ASN1_NYI is returned.
  • Producer schema or profile, DER/BER expectations, and a second independent decoder result
    Use a supported representation or a codec that implements the required standard feature.
    Provides a known-good control without rewriting production evidence when CRYPT_E_ASN1_NYI is returned.

Build a timeline before changing state

For CRYPT_E_ASN1_NYI, preserve the path from source artifact to the byte sequence or object passed into the Windows cryptographic API. In the CRYPT_E_ASN1_NYI path, record file acquisition, transport decoding, object selection, structure identifier, provider selection, and the exact call that first rejects the data. This prevents later trust or certificate errors from being mistaken for the original representation or lookup failure in an unsupported ASN.1 codec feature investigation.

  • In the CRYPT_E_ASN1_NYI path, the untouched artifact or a reproducible nonsecret sample with a cryptographic hash for identity.
  • For CRYPT_E_ASN1_NYI, the API structure type, encoding flags, object or certificate selector, and caller identity.
  • In the CRYPT_E_ASN1_NYI path, independent decode, lookup, or signature observations that do not modify the original evidence.

Reproduction without destructive cleanup

Decode a small known-good object of the same structure type, then decode the production bytes with an independent standards-aware tool in an unsupported ASN.1 codec feature investigation. For CRYPT_E_ASN1_NYI, for encoding, start from a minimal valid structure and add optional fields until the Windows path fails.

  1. Preserve the original input, identity, provider or protocol selection, and first return value for CRYPT_E_ASN1_NYI.
  2. Use one known-good control that changes only the suspected part of the unsupported ASN.1 codec feature path.
  3. For CRYPT_E_ASN1_NYI, reverse the comparison with known-good input on the failing layer where that can be done safely.
  4. Record where behavior first diverges in the unsupported ASN.1 codec feature path instead of judging only by the final application message.

How this differs from similar failures

This is not evidence that all ASN.1 data is invalid; it identifies a feature gap in the chosen implementation path. Do not “repair” binary ASN.1 by editing a hex string without preserving the original bytes and schema when CRYPT_E_ASN1_NYI is returned. In the CRYPT_E_ASN1_NYI path, a changed length octet can move every later diagnostic.

For unsupported ASN.1 codec feature, 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

In the CRYPT_E_ASN1_NYI path, the same object must round-trip under the encoding rules required by its protocol, and an independent implementation should agree on its structure and constraints. For CRYPT_E_ASN1_NYI, keep a regression case that uses nonsecret identifiers and expected outcomes, including one negative control that must continue to fail.

Technical references

For CRYPT_E_ASN1_NYI, these sources define the HRESULT and the relevant unsupported ASN.1 codec feature interface, protocol, or data format.

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