syntax = "proto2";

package textsecure;

option java_package = "org.whispersystems.libsignal.state";
option java_outer_classname = "StorageProtos";

message SessionStructure {
    message Chain {
        optional bytes senderRatchetKey = 1;
        optional bytes senderRatchetKeyPrivate = 2;

        message ChainKey {
            optional uint32 index = 1;
            optional bytes  key   = 2;
        }

        optional ChainKey chainKey = 3;

        message MessageKey {
            optional uint32 index     = 1;
            optional bytes  cipherKey = 2;
            optional bytes  macKey    = 3;
            optional bytes  iv        = 4;
        }

        repeated MessageKey messageKeys = 4;
    }

    message PendingKeyExchange {
        optional uint32 sequence                 = 1;
        optional bytes  localBaseKey             = 2;
        optional bytes  localBaseKeyPrivate      = 3;
        optional bytes  localRatchetKey          = 4;
        optional bytes  localRatchetKeyPrivate   = 5;
        optional bytes  localIdentityKey         = 7;
        optional bytes  localIdentityKeyPrivate  = 8;
    }

    message PendingPreKey {
        optional uint32 preKeyId       = 1;
        optional int32  signedPreKeyId = 3;
        optional bytes  baseKey        = 2;
    }

    optional uint32 sessionVersion      = 1;
    optional bytes localIdentityPublic  = 2;
    optional bytes remoteIdentityPublic = 3;

    optional bytes rootKey              = 4;
    optional uint32 previousCounter     = 5;

    optional Chain senderChain          = 6;
    repeated Chain receiverChains       = 7;

    optional PendingKeyExchange pendingKeyExchange = 8;
    optional PendingPreKey      pendingPreKey      = 9;

    optional uint32 remoteRegistrationId = 10;
    optional uint32 localRegistrationId  = 11;

    optional bool needsRefresh = 12;
    optional bytes aliceBaseKey = 13;
}

message RecordStructure {
    optional SessionStructure currentSession   = 1;
    repeated SessionStructure previousSessions = 2;
}

message PreKeyRecordStructure {
    optional uint32 id        = 1;
    optional bytes  publicKey = 2;
    optional bytes  privateKey = 3;
}

message SignedPreKeyRecordStructure {
    optional uint32  id         = 1;
    optional bytes   publicKey  = 2;
    optional bytes   privateKey = 3;
    optional bytes   signature  = 4;
    optional fixed64 timestamp  = 5;
}

message IdentityKeyPairStructure {
    optional bytes publicKey  = 1;
    optional bytes privateKey = 2;
}

message SenderKeyStateStructure {
    message SenderChainKey {
        optional uint32 iteration = 1;
        optional bytes  seed      = 2;
    }

    message SenderMessageKey {
        optional uint32 iteration = 1;
        optional bytes  seed      = 2;
    }

    message SenderSigningKey {
        optional bytes public  = 1;
        optional bytes private = 2;
    }

    optional uint32           senderKeyId       = 1;
    optional SenderChainKey   senderChainKey    = 2;
    optional SenderSigningKey senderSigningKey  = 3;
    repeated SenderMessageKey senderMessageKeys = 4;
}

message SenderKeyRecordStructure {
    repeated SenderKeyStateStructure senderKeyStates = 1;
}