1 // Copyright 2014 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 "net/quic/crypto/chacha20_poly1305_encrypter.h"
6
7 #include <pk11pub.h>
8
9 #include "base/logging.h"
10
11 using base::StringPiece;
12
13 namespace net {
14
15 namespace {
16
17 const size_t kKeySize = 32;
18 const size_t kNoncePrefixSize = 0;
19
20 } // namespace
21
22 #if defined(USE_NSS)
23
24 // System NSS doesn't support ChaCha20+Poly1305 yet.
25
ChaCha20Poly1305Encrypter()26 ChaCha20Poly1305Encrypter::ChaCha20Poly1305Encrypter()
27 : AeadBaseEncrypter(CKM_INVALID_MECHANISM, NULL, kKeySize,
28 kAuthTagSize, kNoncePrefixSize) {
29 NOTIMPLEMENTED();
30 }
31
~ChaCha20Poly1305Encrypter()32 ChaCha20Poly1305Encrypter::~ChaCha20Poly1305Encrypter() {}
33
34 // static
IsSupported()35 bool ChaCha20Poly1305Encrypter::IsSupported() {
36 return false;
37 }
38
FillAeadParams(StringPiece nonce,StringPiece associated_data,size_t auth_tag_size,AeadParams * aead_params) const39 void ChaCha20Poly1305Encrypter::FillAeadParams(StringPiece nonce,
40 StringPiece associated_data,
41 size_t auth_tag_size,
42 AeadParams* aead_params) const {
43 NOTIMPLEMENTED();
44 }
45
46 #else // defined(USE_NSS)
47
ChaCha20Poly1305Encrypter()48 ChaCha20Poly1305Encrypter::ChaCha20Poly1305Encrypter()
49 : AeadBaseEncrypter(CKM_NSS_CHACHA20_POLY1305, PK11_Encrypt, kKeySize,
50 kAuthTagSize, kNoncePrefixSize) {
51 COMPILE_ASSERT(kKeySize <= kMaxKeySize, key_size_too_big);
52 COMPILE_ASSERT(kNoncePrefixSize <= kMaxNoncePrefixSize,
53 nonce_prefix_size_too_big);
54 }
55
~ChaCha20Poly1305Encrypter()56 ChaCha20Poly1305Encrypter::~ChaCha20Poly1305Encrypter() {}
57
58 // static
IsSupported()59 bool ChaCha20Poly1305Encrypter::IsSupported() {
60 return true;
61 }
62
FillAeadParams(StringPiece nonce,StringPiece associated_data,size_t auth_tag_size,AeadParams * aead_params) const63 void ChaCha20Poly1305Encrypter::FillAeadParams(StringPiece nonce,
64 StringPiece associated_data,
65 size_t auth_tag_size,
66 AeadParams* aead_params) const {
67 aead_params->len = sizeof(aead_params->data.nss_aead_params);
68 CK_NSS_AEAD_PARAMS* nss_aead_params = &aead_params->data.nss_aead_params;
69 nss_aead_params->pIv =
70 reinterpret_cast<CK_BYTE*>(const_cast<char*>(nonce.data()));
71 nss_aead_params->ulIvLen = nonce.size();
72 nss_aead_params->pAAD =
73 reinterpret_cast<CK_BYTE*>(const_cast<char*>(associated_data.data()));
74 nss_aead_params->ulAADLen = associated_data.size();
75 nss_aead_params->ulTagLen = auth_tag_size;
76 }
77
78 #endif // defined(USE_NSS)
79
80 } // namespace net
81