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.
5 #include "net/quic/crypto/chacha20_poly1305_decrypter.h"
9 #include "base/logging.h"
11 using base::StringPiece;
17 const size_t kKeySize = 32;
18 const size_t kNoncePrefixSize = 0;
24 // System NSS doesn't support ChaCha20+Poly1305 yet.
26 ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
27 : AeadBaseDecrypter(CKM_INVALID_MECHANISM, nullptr, kKeySize,
28 kAuthTagSize, kNoncePrefixSize) {
32 ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
35 bool ChaCha20Poly1305Decrypter::IsSupported() {
39 void ChaCha20Poly1305Decrypter::FillAeadParams(StringPiece nonce,
40 StringPiece associated_data,
42 AeadParams* aead_params) const {
46 #else // defined(USE_NSS)
48 ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
49 : AeadBaseDecrypter(CKM_NSS_CHACHA20_POLY1305, PK11_Decrypt, kKeySize,
50 kAuthTagSize, kNoncePrefixSize) {
51 COMPILE_ASSERT(kKeySize <= kMaxKeySize, key_size_too_big);
52 COMPILE_ASSERT(kNoncePrefixSize <= kMaxNoncePrefixSize,
53 nonce_prefix_size_too_big);
56 ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
59 bool ChaCha20Poly1305Decrypter::IsSupported() {
63 void ChaCha20Poly1305Decrypter::FillAeadParams(StringPiece nonce,
64 StringPiece associated_data,
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;
78 #endif // defined(USE_NSS)