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HKDF is a key derivation function specified in RFC5869.

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Generating keys with HKDF from Diffie Hellman agreement

In order to generate multiple session keys from a Diffie Hellman key agreement protocol, I'm trying to use the HKDF to generate this session keys. … The HKDF algorithm uses an Extraction-Expand procedure. In the extraction procedure, it takes as an input a salt and a source key (in my case it will be the Diffie Hellman generated key). …
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