session-android/library/protobuf/LocalStorageProtocol.proto

package textsecure;

option java_package = "org.whispersystems.textsecure.storage";
option java_outer_classname = "StorageProtos";

message SessionStructure {
  message Chain {
    optional bytes senderEphemeral = 1;
    optional bytes senderEphemeralPrivate = 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;
    }

    repeated MessageKey messageKeys = 4;
  }

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

  message PendingPreKey {
    optional uint32 preKeyId = 1;
    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;
}