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README.md

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 This is an implementation of the single-step key derivation function as described in [NIST SP 800-56C revision 1, chapter 4](https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Cr1.pdf). It is an unopinionated approach towards the subject, allowing all 3 options (message digest, hmac and kmac) as H function and leaving open the exact format of the `fixedInfo` parameter.
 
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