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Initial Shared Secret
Secret
HKDF
Root Key
Chain Key
Info
"OLM_ROOT"
Salt
""
Key
Data
HMAC
Chain Key
"\x02"
"\x01"
Key
Data
HMAC
Message Key
Secret
Salt
""
Info
"OLM_KEYS"
HKDF
Cipher Key
Mac Key
IV
Secret
HKDF
Root Key
Chain Key
Info
"OLM_RATCHET"
Salt
Alice's Chain
Bob's Chain
Bob's Key
Alice's Key
ECDH
Shared Secret