Crypto U6, computing HMAC

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How to compute an HMAC

You need to keys, let's call them K1 and K2.

Concatenate K2 with the message and then compute the hash of this.

Then take K1, concatenate it with the result from step 1 and hash this value.

Ultimately, it looks like this: h( K1 || h( K2 || m) )

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