this driver controls CESA unit as same as mvcesa, but uses DMA engines and
does CBC operations, HMAC operations by hardware. about 2 kbytes of data
are processed at one. supported algorithms are:
- DES-CBC, 3DES-CBC, AES-CBC
- HMAC-SHA1, HMAC-MD5
non-CBC algorithm such as AES-GCM is not supported by CESA's acceleration
engine. mvcesa is still useful to implement such algorithms as combination of
accelerated block cipher and software chaining.
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