session-android/library/protobuf/WhisperTextProtocol.proto

package textsecure;

option java_package = "org.whispersystems.textsecure.crypto.protocol";
option java_outer_classname = "WhisperProtos";

message WhisperMessage {
  optional bytes  ephemeralKey    = 1;
  optional uint32 counter         = 2;
  optional uint32 previousCounter = 3;
  optional bytes  ciphertext      = 4;
}

message PreKeyWhisperMessage {
  optional uint32 registrationId = 5;
  optional uint32 preKeyId    = 1;
  optional bytes  baseKey     = 2;
  optional bytes  identityKey = 3;
  optional bytes  message     = 4; // WhisperMessage
}

message KeyExchangeMessage {
  optional uint32 id           = 1;
  optional bytes  baseKey      = 2;
  optional bytes  ephemeralKey = 3;
  optional bytes  identityKey  = 4;
}