1// Copyright 2021 Google LLC 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14// 15//////////////////////////////////////////////////////////////////////////////// 16 17syntax = "proto3"; 18 19package google.crypto.tink; 20 21option java_package = "com.google.crypto.tink.proto"; 22option java_multiple_files = true; 23option go_package = "github.com/google/tink/go/proto/hpke_proto"; 24 25enum HpkeKem { 26 KEM_UNKNOWN = 0; 27 DHKEM_X25519_HKDF_SHA256 = 1; 28 DHKEM_P256_HKDF_SHA256 = 2; 29 DHKEM_P384_HKDF_SHA384 = 3; 30 DHKEM_P521_HKDF_SHA512 = 4; 31} 32 33enum HpkeKdf { 34 KDF_UNKNOWN = 0; 35 HKDF_SHA256 = 1; 36 HKDF_SHA384 = 2; 37 HKDF_SHA512 = 3; 38} 39 40enum HpkeAead { 41 AEAD_UNKNOWN = 0; 42 AES_128_GCM = 1; 43 AES_256_GCM = 2; 44 CHACHA20_POLY1305 = 3; 45} 46 47message HpkeParams { 48 HpkeKem kem = 1; 49 HpkeKdf kdf = 2; 50 HpkeAead aead = 3; 51} 52 53message HpkePublicKey { 54 uint32 version = 1; 55 HpkeParams params = 2; 56 // KEM-encoding of public key (i.e., SerializePublicKey() ) as described in 57 // https://www.rfc-editor.org/rfc/rfc9180.html#name-cryptographic-dependencies. 58 bytes public_key = 3; 59} 60 61message HpkePrivateKey { 62 uint32 version = 1; 63 HpkePublicKey public_key = 2; 64 // KEM-encoding of private key (i.e., SerializePrivateKey() ) as described in 65 // https://www.rfc-editor.org/rfc/rfc9180.html#name-cryptographic-dependencies. 66 bytes private_key = 3; 67} 68 69message HpkeKeyFormat { 70 HpkeParams params = 1; 71} 72