net/quic/crypto/chacha20_poly1305_decrypter_openssl.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 <openssl/evp.h>
   8 #include <openssl/tls1.h>
   9
  10 namespace net {
  11
  12 namespace {
  13
  14 const size_t kKeySize = 32;
  15 const size_t kNoncePrefixSize = 0;
  16
  17 }  // namespace
  18
  19 ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
  20     : AeadBaseDecrypter(EVP_aead_chacha20_poly1305(), kKeySize, kAuthTagSize,
  21                         kNoncePrefixSize) {
  22   static_assert(kKeySize <= kMaxKeySize, "key size too big");
  23   static_assert(kNoncePrefixSize <= kMaxNoncePrefixSize,
  24                 "nonce prefix size too big");
  25 }
  26
  27 ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
  28
  29 // static
  30 bool ChaCha20Poly1305Decrypter::IsSupported() { return true; }
  31
  32 const char* ChaCha20Poly1305Decrypter::cipher_name() const {
  33   return TLS1_TXT_ECDHE_RSA_WITH_CHACHA20_POLY1305;
  34 }
  35
  36 uint32 ChaCha20Poly1305Decrypter::cipher_id() const {
  37   return TLS1_CK_ECDHE_RSA_CHACHA20_POLY1305;
  38 }
  39
  40 }  // namespace net