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 #include "compos_key.h"
18
19 #include <openssl/digest.h>
20 #include <openssl/hkdf.h>
21 #include <openssl/mem.h>
22
23 using android::base::ErrnoError;
24 using android::base::Error;
25 using android::base::Result;
26 using compos_key::Ed25519KeyPair;
27 using compos_key::Seed;
28 using compos_key::Signature;
29
30 namespace compos_key {
keyFromSeed(const Seed & seed)31 Result<Ed25519KeyPair> keyFromSeed(const Seed& seed) {
32 Ed25519KeyPair result;
33 ED25519_keypair_from_seed(result.public_key.data(), result.private_key.data(), seed.data());
34 return result;
35 }
36
sign(const PrivateKey & private_key,const uint8_t * data,size_t data_size)37 Result<Signature> sign(const PrivateKey& private_key, const uint8_t* data, size_t data_size) {
38 Signature result;
39 if (!ED25519_sign(result.data(), data, data_size, private_key.data())) {
40 return Error() << "Failed to sign";
41 }
42 return result;
43 }
44
verify(const PublicKey & public_key,const Signature & signature,const uint8_t * data,size_t data_size)45 bool verify(const PublicKey& public_key, const Signature& signature, const uint8_t* data,
46 size_t data_size) {
47 return ED25519_verify(data, data_size, signature.data(), public_key.data()) == 1;
48 }
49 } // namespace compos_key
50