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ippStsOFBSizeErr
This status belongs to Intel IPP cryptography mode setup. OFB mode turns a block cipher into a keystream generator, so the feedback block size must match the mode variant accepted by the called IPP function.
Do not diagnose it as a bad key or damaged ciphertext first. Capture the exact function name, cipher algorithm, IV length, feedback size argument, and whether the API expects bytes, bits, or a fixed enumerated size.
What to check
- Use the block and feedback sizes documented for the IPP OFB function, not a size copied from CFB or CTR code.
- Verify that wrapper code did not convert bits to bytes twice.
- Keep IV/key validation separate; this status is about the mode-size parameter.
Intel IPP Error Reporting · Intel IPP Cryptography Reference · NIST SP 800-38A block cipher modes
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