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ippStsPaddingErr
This status appears after a primitive checks padding bytes or padding structure and finds values that do not match the selected scheme. In cryptographic and block-oriented formats, that can indicate a wrong key, wrong mode, truncated ciphertext, or altered data.
It is not the same as an unsupported padding mode. The mode may be recognized, but the actual padded data does not validate.
Diagnostic focus
- Record the block size, padding scheme, cipher mode, IV/nonce handling and authenticated-data status.
- Check whether decryption already failed authentication before padding was inspected.
- Avoid exposing padding-failure timing or details in network protocols.
CMS padding rules · IPP error reporting
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