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libomemo-c

C library implementing Signal protocol encryption for secure messaging.

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Implementation of Signal's ratcheting forward secrecy protocol

Examples

add end-to-end encryption to messaging app

$ #include <omemo.h>
// Link against libomemo-c in your C/C++ project
gcc -o messenger messenger.c -lomemo -lsignal-protocol-c

set up encrypted message ratcheting between users

$ // Initialize session with omemo_context_t and establish double ratchet
omemo_message_t *msg = omemo_message_create();
omemo_message_encrypt(context, plaintext, msg);

handle rotating encryption keys automatically

$ // Library handles forward secrecy automatically
omemo_context_rotate_sender_chain(context);
// Each message uses fresh derived keys

implement secure group chat encryption

$ // Use OMEMO for multi-party conversations
omemo_group_message_encrypt(context, recipients, plaintext, encrypted);
omemo_group_message_decrypt(context, sender, encrypted, plaintext);

verify message authenticity with signal protocol

$ // Automatic authentication via double ratchet
bool authenticated = omemo_message_decrypt(context, ciphertext, plaintext);
// Returns false if verification fails