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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. …
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