HRESULT 0x80093109 (CRYPT_E_ASN1_BADARGS): meaning and diagnosis

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Invalid arguments were supplied to the ASN.1 encoder or decoder.

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CRYPT_E_ASN1_BADPDU	CRYPT_E_ASN1_BADREAL

CRYPT_E_ASN1_BADARGS

This is an API contract failure

CRYPT_E_ASN1_BADARGS means the ASN.1 implementation rejected its call parameters. Typical causes include incompatible flags, a missing mandatory pointer, an invalid structure selector, inconsistent buffer and length values, or callback parameters that do not match the requested allocation mode.

The encoded bytes might never have been examined. That separates this result from malformed-data errors such as BADTAG, EOD, or CORRUPT. Replacing the certificate or request is unlikely to help until the caller's argument set is corrected.

Debugging checklist

Log every flag, encoding type, structure type, pointer, and byte count.
Check the function's rules for null output buffers used only to query size.
Ensure allocation callbacks are provided as the required pair.
Verify that ANSI and Unicode structure variants are not mixed.

References

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