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HMAC is a method for constructing a message authentication code based on a cryptographic hash function.
3
votes
Question about HMAC with SHA1
Before using it, HMAC will pad the provided key material with 0's until it reaches the block size. The size (and the quality!) … is it bad idea to implement HMAC myself, if I have implementation of SHA1?
It might be a good exercise if you want to get familiar with cryptography implementation details. …