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Libomemo-c
Jul 20, 2023
Implementation of the ratcheting forward secrecy protocol
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.
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OMEMO version 0.3.0 uses the original libsignal-protocol-c implementation with its protocol versions 2 and 3.
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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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