1 files changed, 148 insertions, 0 deletions
diff --git a/chromium/net/quic/crypto/aead_base_encrypter_openssl.cc b/chromium/net/quic/crypto/aead_base_encrypter_openssl.cc
new file mode 100644
index 00000000000..9f053abf932
--- /dev/null
+++ b/chromium/net/quic/crypto/aead_base_encrypter_openssl.cc
@@ -0,0 +1,148 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/quic/crypto/aead_base_encrypter.h"
+
+#include <openssl/err.h>
+#include <openssl/evp.h>
+#include <string.h>
+
+#include "base/memory/scoped_ptr.h"
+
+using base::StringPiece;
+
+namespace net {
+
+namespace {
+
+// In debug builds only, log OpenSSL error stack. Then clear OpenSSL error
+// stack.
+void DLogOpenSslErrors() {
+#ifdef NDEBUG
+  while (ERR_get_error()) {}
+#else
+  while (unsigned long error = ERR_get_error()) {
+    char buf[120];
+    ERR_error_string_n(error, buf, arraysize(buf));
+    DLOG(ERROR) << "OpenSSL error: " << buf;
+  }
+#endif
+}
+
+}  // namespace
+
+AeadBaseEncrypter::AeadBaseEncrypter(const EVP_AEAD* aead_alg,
+                                     size_t key_size,
+                                     size_t auth_tag_size,
+                                     size_t nonce_prefix_size)
+    : aead_alg_(aead_alg),
+      key_size_(key_size),
+      auth_tag_size_(auth_tag_size),
+      nonce_prefix_size_(nonce_prefix_size) {
+  DCHECK_LE(key_size_, sizeof(key_));
+  DCHECK_LE(nonce_prefix_size_, sizeof(nonce_prefix_));
+}
+
+AeadBaseEncrypter::~AeadBaseEncrypter() {}
+
+bool AeadBaseEncrypter::SetKey(StringPiece key) {
+  DCHECK_EQ(key.size(), key_size_);
+  if (key.size() != key_size_) {
+    return false;
+  }
+  memcpy(key_, key.data(), key.size());
+
+  EVP_AEAD_CTX_cleanup(ctx_.get());
+
+  if (!EVP_AEAD_CTX_init(ctx_.get(), aead_alg_, key_, key_size_,
+                         auth_tag_size_, NULL)) {
+    DLogOpenSslErrors();
+    return false;
+  }
+
+  return true;
+}
+
+bool AeadBaseEncrypter::SetNoncePrefix(StringPiece nonce_prefix) {
+  DCHECK_EQ(nonce_prefix.size(), nonce_prefix_size_);
+  if (nonce_prefix.size() != nonce_prefix_size_) {
+    return false;
+  }
+  memcpy(nonce_prefix_, nonce_prefix.data(), nonce_prefix.size());
+  return true;
+}
+
+bool AeadBaseEncrypter::Encrypt(StringPiece nonce,
+                                StringPiece associated_data,
+                                StringPiece plaintext,
+                                unsigned char* output) {
+  if (nonce.size() != nonce_prefix_size_ + sizeof(QuicPacketSequenceNumber)) {
+    return false;
+  }
+
+  ssize_t len = EVP_AEAD_CTX_seal(
+      ctx_.get(), output, plaintext.size() + auth_tag_size_,
+      reinterpret_cast<const uint8_t*>(nonce.data()), nonce.size(),
+      reinterpret_cast<const uint8_t*>(plaintext.data()), plaintext.size(),
+      reinterpret_cast<const uint8_t*>(associated_data.data()),
+      associated_data.size());
+
+  if (len < 0) {
+    DLogOpenSslErrors();
+    return false;
+  }
+
+  return true;
+}
+
+QuicData* AeadBaseEncrypter::EncryptPacket(
+    QuicPacketSequenceNumber sequence_number,
+    StringPiece associated_data,
+    StringPiece plaintext) {
+  size_t ciphertext_size = GetCiphertextSize(plaintext.length());
+  scoped_ptr<char[]> ciphertext(new char[ciphertext_size]);
+
+  // TODO(ianswett): Introduce a check to ensure that we don't encrypt with the
+  // same sequence number twice.
+  uint8 nonce[sizeof(nonce_prefix_) + sizeof(sequence_number)];
+  const size_t nonce_size = nonce_prefix_size_ + sizeof(sequence_number);
+  DCHECK_LE(nonce_size, sizeof(nonce));
+  memcpy(nonce, nonce_prefix_, nonce_prefix_size_);
+  memcpy(nonce + nonce_prefix_size_, &sequence_number, sizeof(sequence_number));
+  if (!Encrypt(StringPiece(reinterpret_cast<char*>(nonce), nonce_size),
+               associated_data, plaintext,
+               reinterpret_cast<unsigned char*>(ciphertext.get()))) {
+    return NULL;
+  }
+
+  return new QuicData(ciphertext.release(), ciphertext_size, true);
+}
+
+size_t AeadBaseEncrypter::GetKeySize() const { return key_size_; }
+
+size_t AeadBaseEncrypter::GetNoncePrefixSize() const {
+  return nonce_prefix_size_;
+}
+
+size_t AeadBaseEncrypter::GetMaxPlaintextSize(size_t ciphertext_size) const {
+  return ciphertext_size - auth_tag_size_;
+}
+
+size_t AeadBaseEncrypter::GetCiphertextSize(size_t plaintext_size) const {
+  return plaintext_size + auth_tag_size_;
+}
+
+StringPiece AeadBaseEncrypter::GetKey() const {
+  return StringPiece(reinterpret_cast<const char*>(key_), key_size_);
+}
+
+StringPiece AeadBaseEncrypter::GetNoncePrefix() const {
+  if (nonce_prefix_size_ == 0) {
+    return StringPiece();
+  }
+  return StringPiece(reinterpret_cast<const char*>(nonce_prefix_),
+                     nonce_prefix_size_);
+}
+
+}  // namespace net