Question: Please generate a keyed hash using HMAC - MD 5 , HMAC - SHA 2 5 6 , and HMAC - SHA 1 for any

Please generate a keyed hash using HMAC-MD5, HMAC-SHA256, and HMAC-SHA1 for any file that
you choose. Please try several keys with different length. Do we have to use a key with a fixed size in
HMAC? If so, what is the key size? If not, why?

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