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A comment on How Signal Beats WhatsApp. Parent comment
https://github.com/WhisperSystems/libsignal-protocol-c
https://github.com/WhisperSystems/libsignal-protocol-java
More generally (i.e. not for messaging apps), libsodium is great for application-layer cryptography:
https://download.libsodium.org/doc/bindings_for_other_langua...
https://github.com/WhisperSystems/libsignal-protocol-c
https://github.com/WhisperSystems/libsignal-protocol-java
More generally (i.e. not for messaging apps), libsodium is great for application-layer cryptography:
https://download.libsodium.org/doc/bindings_for_other_langua...