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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
syntax = "proto2";
package securegcm;
option optimize_for = LITE_RUNTIME;
option java_package = "com.google.security.cryptauth.lib.securegcm";
option java_outer_classname = "UkeyProto";
message Ukey2Message {
enum Type {
UNKNOWN_DO_NOT_USE = 0;
ALERT = 1;
CLIENT_INIT = 2;
SERVER_INIT = 3;
CLIENT_FINISH = 4;
}
optional Type message_type = 1; // Identifies message type
optional bytes message_data = 2; // Actual message, to be parsed according to
// message_type
}
message Ukey2Alert {
enum AlertType {
// Framing errors
BAD_MESSAGE = 1; // The message could not be deserialized
BAD_MESSAGE_TYPE = 2; // message_type has an undefined value
INCORRECT_MESSAGE = 3; // message_type received does not correspond to
// expected type at this stage of the protocol
BAD_MESSAGE_DATA = 4; // Could not deserialize message_data as per
// value inmessage_type
// ClientInit and ServerInit errors
BAD_VERSION = 100; // version is invalid; server cannot find
// suitable version to speak with client.
BAD_RANDOM = 101; // Random data is missing or of incorrect
// length
BAD_HANDSHAKE_CIPHER = 102; // No suitable handshake ciphers were found
BAD_NEXT_PROTOCOL = 103; // The next protocol is missing, unknown, or
// unsupported
BAD_PUBLIC_KEY = 104; // The public key could not be parsed
// Other errors
INTERNAL_ERROR = 200; // An internal error has occurred. error_message
// may contain additional details for logging
// and debugging.
}
optional AlertType type = 1;
optional string error_message = 2;
}
enum Ukey2HandshakeCipher {
RESERVED = 0;
P256_SHA512 = 100; // NIST P-256 used for ECDH, SHA512 used for
// commitment
CURVE25519_SHA512 = 200; // Curve 25519 used for ECDH, SHA512 used for
// commitment
}
message Ukey2ClientInit {
optional int32 version = 1; // highest supported version for rollback
// protection
optional bytes random = 2; // random bytes for replay/reuse protection
// One commitment (hash of ClientFinished containing public key) per supported
// cipher
message CipherCommitment {
optional Ukey2HandshakeCipher handshake_cipher = 1;
optional bytes commitment = 2;
}
repeated CipherCommitment cipher_commitments = 3;
// Next protocol that the client wants to speak.
optional string next_protocol = 4;
}
message Ukey2ServerInit {
optional int32 version = 1; // highest supported version for rollback
// protection
optional bytes random = 2; // random bytes for replay/reuse protection
// Selected Cipher and corresponding public key
optional Ukey2HandshakeCipher handshake_cipher = 3;
optional bytes public_key = 4;
}
message Ukey2ClientFinished {
optional bytes public_key = 1; // public key matching selected handshake
// cipher
}
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