1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "crypto/secure_hash.h"
6
7 #if defined(OPENSSL_IS_BORINGSSL)
8 #include <openssl/mem.h>
9 #else
10 #include <openssl/crypto.h>
11 #endif
12 #include <openssl/sha.h>
13 #include <stddef.h>
14
15 #include "base/logging.h"
16 #include "base/memory/ptr_util.h"
17 #include "base/pickle.h"
18 #include "crypto/openssl_util.h"
19
20 namespace crypto {
21
22 namespace {
23
24 class SecureHashSHA256 : public SecureHash {
25 public:
SecureHashSHA256()26 SecureHashSHA256() {
27 SHA256_Init(&ctx_);
28 }
29
SecureHashSHA256(const SecureHashSHA256 & other)30 SecureHashSHA256(const SecureHashSHA256& other) {
31 memcpy(&ctx_, &other.ctx_, sizeof(ctx_));
32 }
33
~SecureHashSHA256()34 ~SecureHashSHA256() override {
35 OPENSSL_cleanse(&ctx_, sizeof(ctx_));
36 }
37
Update(const void * input,size_t len)38 void Update(const void* input, size_t len) override {
39 SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len);
40 }
41
Finish(void * output,size_t len)42 void Finish(void* output, size_t len) override {
43 ScopedOpenSSLSafeSizeBuffer<SHA256_DIGEST_LENGTH> result(
44 static_cast<unsigned char*>(output), len);
45 SHA256_Final(result.safe_buffer(), &ctx_);
46 }
47
Clone() const48 std::unique_ptr<SecureHash> Clone() const override {
49 return std::make_unique<SecureHashSHA256>(*this);
50 }
51
GetHashLength() const52 size_t GetHashLength() const override { return SHA256_DIGEST_LENGTH; }
53
54 private:
55 SHA256_CTX ctx_;
56 };
57
58 } // namespace
59
Create(Algorithm algorithm)60 std::unique_ptr<SecureHash> SecureHash::Create(Algorithm algorithm) {
61 switch (algorithm) {
62 case SHA256:
63 return std::make_unique<SecureHashSHA256>();
64 default:
65 NOTIMPLEMENTED();
66 return nullptr;
67 }
68 }
69
70 } // namespace crypto
71