1 /*
2  * Copyright 2022 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include <android-base/result.h>
20 #include <openssl/curve25519.h>
21 
22 #include <array>
23 
24 namespace compos_key {
25 constexpr size_t ED25519_SEED_LEN = 32;
26 
27 using PrivateKey = std::array<uint8_t, ED25519_PRIVATE_KEY_LEN>;
28 using PublicKey = std::array<uint8_t, ED25519_PUBLIC_KEY_LEN>;
29 using Seed = std::array<uint8_t, ED25519_SEED_LEN>;
30 using Signature = std::array<uint8_t, ED25519_SIGNATURE_LEN>;
31 
32 struct Ed25519KeyPair {
33     PrivateKey private_key;
34     PublicKey public_key;
35 };
36 
37 android::base::Result<Ed25519KeyPair> keyFromSeed(const Seed& seed);
38 
39 android::base::Result<Signature> sign(const PrivateKey& private_key, const uint8_t* data,
40                                       size_t data_size);
41 
42 bool verify(const PublicKey& public_key, const Signature& signature, const uint8_t* data,
43             size_t data_size);
44 } // namespace compos_key
45