HRESULT 0x8009202C (CRYPT_E_MISSING_PUBKEY

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Description:

SubjectPublicKeyInfo omits parameters required by its public-key algorithm.

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CRYPT_E_NO_TRUSTED_SIGNER	CRYPT_E_OBJECT_LOCATOR_OBJECT_NOT_FOUND

CRYPT_E_MISSING_PUBKEY_PARA

AlgorithmIdentifier parameters are algorithm-specific

CRYPT_E_MISSING_PUBKEY_PARA means the public key's AlgorithmIdentifier does not contain parameters required to interpret the key. The OID alone may identify a family, while the parameters select a curve, constraints, or another algorithm-specific definition needed to decode and validate the subject public key.

For example, the PKIX profile for id-ecPublicKey requires parameters that identify the elliptic curve. Other algorithms define absent parameters, explicit NULL, or structured parameters differently. Code that normalizes every AlgorithmIdentifier to the same convention can therefore break otherwise valid keys.

Diagnostic approach

Capture the algorithm OID and the raw DER for the parameters field.
Consult the profile for that exact OID rather than copying rules from RSA or EC.
Check whether a serializer discarded parameters during key import or export.
Regenerate the SubjectPublicKeyInfo from the key provider when the original encoding is incomplete.

References

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