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ippStsCFBSizeErr
This IPP cryptography status is raised while configuring Cipher Feedback (CFB) mode. The feedback segment size is not just a buffer length; it is part of the mode definition accepted by the primitive.
When this appears in portable crypto glue code, compare the requested CFB segment size with the exact IPP API variant. Code written for another library may allow segment sizes that the selected IPP function does not expose.
What usually matters
- The selected cipher and IPP function variant.
- The feedback segment size and its unit.
- Whether the caller confused CFB8, CFB128, and full-block CFB handling.
Intel IPP Error Reporting · Intel IPP Cryptography Reference · NIST SP 800-38A CFB mode
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