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This is a fork of libsignal-protocol-c, an implementation of Signal's
ratcheting forward secrecy protocol that works in synchronous and asynchronous
messaging. The fork adds support for OMEMO as defined in XEP-0384 versions
0.3.0 and later.
* OMEMO version 0.3.0 uses the original libsignal-protocol-c implementation
with its protocol versions 2 and 3.
* OMEMO version 0.4.0+ is implemented using a new protocol version 4
internally. In comparison with protocol version 3, it changes:
* HKDF info strings
* Protocol buffer encoding
* Signature scheme (uses XEd25519 instead of custom "Curve25519 signatures")
* Specification-compliant double ratchet
* Support for Ed25519 public keys
* Various serializations
* Removes unused functionality
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