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// Copyright 2021 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 = "proto3";
package google.crypto.tink;
option java_package = "com.google.crypto.tink.proto";
option java_multiple_files = true;
option go_package = "github.com/google/tink/go/proto/hpke_proto";
enum HpkeKem {
KEM_UNKNOWN = 0;
DHKEM_X25519_HKDF_SHA256 = 1;
DHKEM_P256_HKDF_SHA256 = 2;
DHKEM_P384_HKDF_SHA384 = 3;
DHKEM_P521_HKDF_SHA512 = 4;
}
enum HpkeKdf {
KDF_UNKNOWN = 0;
HKDF_SHA256 = 1;
HKDF_SHA384 = 2;
HKDF_SHA512 = 3;
}
enum HpkeAead {
AEAD_UNKNOWN = 0;
AES_128_GCM = 1;
AES_256_GCM = 2;
CHACHA20_POLY1305 = 3;
}
message HpkeParams {
HpkeKem kem = 1;
HpkeKdf kdf = 2;
HpkeAead aead = 3;
}
message HpkePublicKey {
uint32 version = 1;
HpkeParams params = 2;
// KEM-encoding of public key (i.e., SerializePublicKey() ) as described in
// https://www.rfc-editor.org/rfc/rfc9180.html#name-cryptographic-dependencies.
bytes public_key = 3;
}
message HpkePrivateKey {
uint32 version = 1;
HpkePublicKey public_key = 2;
// KEM-encoding of private key (i.e., SerializePrivateKey() ) as described in
// https://www.rfc-editor.org/rfc/rfc9180.html#name-cryptographic-dependencies.
bytes private_key = 3;
}
message HpkeKeyFormat {
HpkeParams params = 1;
}
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