Question: How many keys does HMAC require? 1 single key from which we derive an inner and an outer key by XORing it with different padding

How many keys does HMAC require?
1 single key from which we derive an inner and an outer key by XORing it with different padding strings. .
2 independent keys.
It is based on hash functions, hence it does not require any key.
How many keys does HMAC require? 1 single key

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