omemo_dart/protobuf/schema.proto

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// Taken from https://xmpp.org/extensions/xep-0384.html#protobuf-schema
message OMEMOMessage {
required uint32 n = 1;
required uint32 pn = 2;
required bytes dh_pub = 3;
optional bytes ciphertext = 4;
}
message OMEMOAuthenticatedMessage {
required bytes mac = 1;
required bytes message = 2; // Byte-encoding of an OMEMOMessage
}
message OMEMOKeyExchange {
required uint32 pk_id = 1;
required uint32 spk_id = 2;
required bytes ik = 3;
required bytes ek = 4;
required OMEMOAuthenticatedMessage message = 5;
}