chat_proto/protos/encryption.proto

syntax = "proto3";

package logoschat.encryption;


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 InboxHandshakeV1 {

    message InboxHeaderV1 {
        bytes initiator_static = 1;    
        bytes initiator_ephemeral = 2;  
        bytes responder_static = 3;    
        bytes responder_ephemeral = 4; // Replace with RKI to save bytes
    }
    InboxHeaderV1 header = 1;
    bytes payload = 2;
}