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Issue 1909513003: Rename crypto/ *_openssl files (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 8 months ago
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1 // Copyright 2015 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/aead_openssl.h"
6
7 #include <openssl/aes.h>
8 #include <openssl/evp.h>
9 #include <stddef.h>
10 #include <stdint.h>
11 #include <string>
12
13 #include "base/strings/string_util.h"
14 #include "crypto/openssl_util.h"
15
16 namespace crypto {
17
18 Aead::Aead(AeadAlgorithm algorithm) : key_(nullptr) {
19 EnsureOpenSSLInit();
20 switch (algorithm) {
21 case AES_128_CTR_HMAC_SHA256:
22 aead_ = EVP_aead_aes_128_ctr_hmac_sha256();
23 break;
24 }
25 }
26
27 Aead::~Aead() {
28 }
29
30 void Aead::Init(const std::string* key) {
31 DCHECK(!key_);
32 DCHECK_EQ(KeyLength(), key->size());
33 key_ = key;
34 }
35
36 bool Aead::Seal(const base::StringPiece& plaintext,
37 const base::StringPiece& nonce,
38 const base::StringPiece& additional_data,
39 std::string* ciphertext) const {
40 DCHECK(key_);
41 DCHECK_EQ(NonceLength(), nonce.size());
42 EVP_AEAD_CTX ctx;
43
44 if (!EVP_AEAD_CTX_init(&ctx, aead_,
45 reinterpret_cast<const uint8_t*>(key_->data()),
46 key_->size(), EVP_AEAD_DEFAULT_TAG_LENGTH, nullptr)) {
47 return false;
48 }
49
50 std::string result;
51 const size_t max_output_length =
52 EVP_AEAD_max_overhead(aead_) + plaintext.size();
53 size_t output_length;
54 uint8_t* out_ptr = reinterpret_cast<uint8_t*>(
55 base::WriteInto(&result, max_output_length + 1));
56
57 if (!EVP_AEAD_CTX_seal(
58 &ctx, out_ptr, &output_length, max_output_length,
59 reinterpret_cast<const uint8_t*>(nonce.data()), nonce.size(),
60 reinterpret_cast<const uint8_t*>(plaintext.data()), plaintext.size(),
61 reinterpret_cast<const uint8_t*>(additional_data.data()),
62 additional_data.size())) {
63 EVP_AEAD_CTX_cleanup(&ctx);
64 return false;
65 }
66
67 DCHECK_LE(output_length, max_output_length);
68 result.resize(output_length);
69
70 ciphertext->swap(result);
71 EVP_AEAD_CTX_cleanup(&ctx);
72
73 return true;
74 }
75
76 bool Aead::Open(const base::StringPiece& ciphertext,
77 const base::StringPiece& nonce,
78 const base::StringPiece& additional_data,
79 std::string* plaintext) const {
80 DCHECK(key_);
81 EVP_AEAD_CTX ctx;
82
83 if (!EVP_AEAD_CTX_init(&ctx, aead_,
84 reinterpret_cast<const uint8_t*>(key_->data()),
85 key_->size(), EVP_AEAD_DEFAULT_TAG_LENGTH, nullptr)) {
86 return false;
87 }
88
89 std::string result;
90 const size_t max_output_length = ciphertext.size();
91 size_t output_length;
92 uint8_t* out_ptr = reinterpret_cast<uint8_t*>(
93 base::WriteInto(&result, max_output_length + 1));
94
95 if (!EVP_AEAD_CTX_open(
96 &ctx, out_ptr, &output_length, max_output_length,
97 reinterpret_cast<const uint8_t*>(nonce.data()), nonce.size(),
98 reinterpret_cast<const uint8_t*>(ciphertext.data()),
99 ciphertext.size(),
100 reinterpret_cast<const uint8_t*>(additional_data.data()),
101 additional_data.size())) {
102 EVP_AEAD_CTX_cleanup(&ctx);
103 return false;
104 }
105
106 DCHECK_LE(output_length, max_output_length);
107 result.resize(output_length);
108
109 plaintext->swap(result);
110 EVP_AEAD_CTX_cleanup(&ctx);
111
112 return true;
113 }
114
115 size_t Aead::KeyLength() const {
116 return EVP_AEAD_key_length(aead_);
117 }
118
119 size_t Aead::NonceLength() const {
120 return EVP_AEAD_nonce_length(aead_);
121 }
122
123 } // namespace
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