net/quic/crypto/chacha20_poly1305_decrypter_nss.cc

   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_decrypter.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
  26 ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
  27     : AeadBaseDecrypter(CKM_INVALID_MECHANISM, NULL, kKeySize,
  28                         kAuthTagSize, kNoncePrefixSize) {
  29   NOTIMPLEMENTED();
  30 }
  31
  32 ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
  33
  34 // static
  35 bool ChaCha20Poly1305Decrypter::IsSupported() {
  36   return false;
  37 }
  38
  39 void ChaCha20Poly1305Decrypter::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
  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);
  54 }
  55
  56 ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
  57
  58 // static
  59 bool ChaCha20Poly1305Decrypter::IsSupported() {
  60   return true;
  61 }
  62
  63 void ChaCha20Poly1305Decrypter::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