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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
syntax = "proto2";
package encrypted_messages;
// Chrome requires this.
option optimize_for = LITE_RUNTIME;
// This protobuffer is intended to store an encrypted message.
// Messages are encrypted with a secret derived from a client key pair (which
// should be generated fresh randomly for each message) and a server public
// key. The remote message recipient can decrypt the message by performing the
// same key exchange using the included client public key to recover the shared
// secret.
message EncryptedMessage {
// An encrypted, serialized message.
required bytes encrypted_message = 1;
// The server public key version that was used to derive the shared secret.
required uint32 server_public_key_version = 2;
// The client public key that corresponds to the private key that was used
// to derive the shared secret.
required bytes client_public_key = 3;
// The encryption algorithm used to encrypt the message.
enum Algorithm {
UNKNOWN_ALGORITHM = 0;
AEAD_ECDH_AES_128_CTR_HMAC_SHA256 = 1;
}
optional Algorithm algorithm = 4
[default = AEAD_ECDH_AES_128_CTR_HMAC_SHA256];
};
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