chat_proto/protos/encryption.proto

syntax = "proto3";

package logoschat.encryption;


// TODO: This also encompasses plaintexts, is there a better name?
// Alternatives: ???
message EncryptedPayload {

    oneof encryption {
        encryption.Plaintext plaintext = 1;
		encryption.Doubleratchet doubleratchet = 2;
        encryption.XK0 xk0 = 3;
    }
}

message Plaintext {
    bytes payload=1;
}

message Doubleratchet {
    bytes dh = 1;       // 32 byte array
    uint32 msgNum = 2;
    uint32 prevChainLen = 3;
    bytes ciphertext = 4;
    string aux = 5;
}

message XK0 {
    bytes initiator_static = 1;    
    bytes initiator_ephemeral = 2;  
    bytes responder_static = 3;    
    bytes responder_ephemeral = 4; // Replace with RKI to save bytes
    bytes payload = 5;
}