1 // Copyright 2021 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://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, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #define PW_LOG_MODULE_NAME "SHA256-MTLS"
15 #define PW_LOG_LEVEL PW_LOG_LEVEL_WARN
16
17 #include "pw_crypto/sha256.h"
18 #include "pw_status/status.h"
19
20 namespace pw::crypto::sha256::backend {
21
DoInit(NativeSha256Context & ctx)22 Status DoInit(NativeSha256Context& ctx) {
23 // mbedtsl_sha256_init() never fails (returns void).
24 mbedtls_sha256_init(&ctx);
25
26 if (mbedtls_sha256_starts_ret(&ctx, /* is224 = */ 0)) {
27 return Status::Internal();
28 }
29
30 return OkStatus();
31 }
32
DoUpdate(NativeSha256Context & ctx,ConstByteSpan data)33 Status DoUpdate(NativeSha256Context& ctx, ConstByteSpan data) {
34 if (mbedtls_sha256_update_ret(
35 &ctx,
36 reinterpret_cast<const unsigned char*>(data.data()),
37 data.size())) {
38 return Status::Internal();
39 }
40
41 return OkStatus();
42 }
43
DoFinal(NativeSha256Context & ctx,ByteSpan out_digest)44 Status DoFinal(NativeSha256Context& ctx, ByteSpan out_digest) {
45 if (mbedtls_sha256_finish_ret(
46 &ctx, reinterpret_cast<unsigned char*>(out_digest.data()))) {
47 return Status::Internal();
48 }
49
50 return OkStatus();
51 }
52
53 } // namespace pw::crypto::sha256::backend
54