Add DerivedKeystore for fleet-wide cookie sealing - #576
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Summary: Fleet-wide NTS cookie keystore: a pure HKDF key-derivation primitive plus the DerivedKeystore that uses it, so NTS-KE and NTP can seal and open cookies on different hosts from one shared master, with no shared live state and no hot-path RPC. - deriveCookieKey(master, id) = HKDF-SHA256(master, salt=BE32(id), info="fbnts-cookie-seal-v1") -> a masterKeyLen (64-octet) key for the AES-SIV-CMAC-512 master AEAD. Pure: no clock, state, or I/O. - DerivedKeystore implements the Keystore interface: SealCookie derives a key from the master (fixed cookieKeyID) and reuses the existing AES-SIV envelope; OpenCookie re-derives from the cookie's Key ID and opens it. No mutex, since the master is immutable and derivation is pure. Time-based rotation/windowing is deferred to a later change. Reviewed By: leoleovich Differential Revision: D114721800
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Summary:
Fleet-wide NTS cookie keystore: a pure HKDF key-derivation primitive plus the
DerivedKeystore that uses it, so NTS-KE and NTP can seal and open cookies on
different hosts from one shared master, with no shared live state and no
hot-path RPC.
info="fbnts-cookie-seal-v1") -> a masterKeyLen (64-octet) key for the
AES-SIV-CMAC-512 master AEAD. Pure: no clock, state, or I/O.
from the master (fixed cookieKeyID) and reuses the existing AES-SIV envelope;
OpenCookie re-derives from the cookie's Key ID and opens it. No mutex, since
the master is immutable and derivation is pure. Time-based rotation/windowing
is deferred to a later change.
Reviewed By: leoleovich
Differential Revision: D114721800