HKDF is a key derivation function specified in RFC5869.

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Computing IV for CBC from PBKDF2 + HKDF

Note that this question is somewhat similar to Can I use my random IV (for AES) as a salt for PBKDF2? My current encryption format computes two random PBKDF2 salts (encryption and HMAC, 8 bytes each) ...
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Random numbers for Master Key and Key_block

Exploration through RFCs concludes that random numbers used in the creation of Master Key and Key Block(Key material for Encryption Key and Mac Secret) are from ServerHello.random and ...
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HKDF as keystream generator

This is not my design, but used in the onepw protocol used for the new sync scheme in firefox by mozilla. https://github.com/mozilla/fxa-auth-server/wiki/onepw-protocol In this scheme a key is ...