>Hello, ALGORITHM OPERATION command has 2 types of HMAC: normal HMAC
>and HMAC with precomputed IPAD and OPAD. Does this mean that for the
>first option we don't have to give key?
>
[Platon] No. If you need a plain hash, set AAI = 0. HMAC means a
keyed hash. The difference is only in the format of the key.
>And for the second option, security manual says if we first issue
>KEY command for IPAD and OPAD followed by FIFO STORE, then key will
>be encrypted and stored. So while verifying we can specify encrypted
>key by calling KEY command or we have to again call KEY command
>for IPAD and OPAD?
>
[Platon] You need to generate a split key only once. Any subsequent
operation with this key can use the split key.
Have a great day,
Platon
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