Rename crypto/ *_openssl files

crypto/encryptor.cc

 // Copyright (c) 2012 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 "crypto/encryptor.h"
 
+#include <openssl/aes.h>
+#include <openssl/evp.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
+#include "base/strings/string_util.h"
 #include "base/sys_byteorder.h"
+#include "crypto/openssl_util.h"
+#include "crypto/symmetric_key.h"
 
 namespace crypto {
 
+namespace {
+
+const EVP_CIPHER* GetCipherForKey(SymmetricKey* key) {
+  switch (key->key().length()) {
+    case 16: return EVP_aes_128_cbc();
+    case 32: return EVP_aes_256_cbc();
+    default: return NULL;
+  }
+}
+
+// On destruction this class will cleanup the ctx, and also clear the OpenSSL
+// ERR stack as a convenience.
+class ScopedCipherCTX {
+ public:
+  explicit ScopedCipherCTX() {
+    EVP_CIPHER_CTX_init(&ctx_);
+  }
+  ~ScopedCipherCTX() {
+    EVP_CIPHER_CTX_cleanup(&ctx_);
+    ClearOpenSSLERRStack(FROM_HERE);
+  }
+  EVP_CIPHER_CTX* get() { return &ctx_; }
+
+ private:
+  EVP_CIPHER_CTX ctx_;
+};
+
+}  // namespace
+
 /////////////////////////////////////////////////////////////////////////////
 // Encyptor::Counter Implementation.
 Encryptor::Counter::Counter(const base::StringPiece& counter) {
   CHECK(sizeof(counter_) == counter.length());
 
   memcpy(&counter_, counter.data(), sizeof(counter_));
 }
 
 Encryptor::Counter::~Counter() {
 }
@@ skipping 16 matching lines @@
 void Encryptor::Counter::Write(void* buf) {
   uint8_t* buf_ptr = reinterpret_cast<uint8_t*>(buf);
   memcpy(buf_ptr, &counter_, sizeof(counter_));
 }
 
 size_t Encryptor::Counter::GetLengthInBytes() const {
   return sizeof(counter_);
 }
 
 /////////////////////////////////////////////////////////////////////////////
-// Partial Encryptor Implementation.
+// Encryptor Implementation.
+
+Encryptor::Encryptor()
+    : key_(NULL),
+      mode_(CBC) {
+}
+
+Encryptor::~Encryptor() {
+}
+
+bool Encryptor::Init(SymmetricKey* key,
+                     Mode mode,
+                     const base::StringPiece& iv) {
+  DCHECK(key);
+  DCHECK(mode == CBC || mode == CTR);
+
+  EnsureOpenSSLInit();
+  if (mode == CBC && iv.size() != AES_BLOCK_SIZE)
+    return false;
+
+  if (GetCipherForKey(key) == NULL)
+    return false;
+
+  key_ = key;
+  mode_ = mode;
+  iv.CopyToString(&iv_);
+  return true;
+}
+
+bool Encryptor::Encrypt(const base::StringPiece& plaintext,
+                        std::string* ciphertext) {
+  CHECK(!plaintext.empty() || (mode_ == CBC));
+  return (mode_ == CTR) ?
+      CryptCTR(true, plaintext, ciphertext) :
+      Crypt(true, plaintext, ciphertext);
+}
+
+bool Encryptor::Decrypt(const base::StringPiece& ciphertext,
+                        std::string* plaintext) {
+  CHECK(!ciphertext.empty());
+  return (mode_ == CTR) ?
+      CryptCTR(false, ciphertext, plaintext) :
+      Crypt(false, ciphertext, plaintext);
+}
 
 bool Encryptor::SetCounter(const base::StringPiece& counter) {
   if (mode_ != CTR)
     return false;
   if (counter.length() != 16u)
     return false;
 
   counter_.reset(new Counter(counter));
   return true;
 }
@@ skipping 28 matching lines @@
                             void* ciphertext) const {
   DCHECK_EQ(CTR, mode_);
   const uint8_t* plaintext_ptr = reinterpret_cast<const uint8_t*>(plaintext);
   const uint8_t* mask_ptr = reinterpret_cast<const uint8_t*>(mask);
   uint8_t* ciphertext_ptr = reinterpret_cast<uint8_t*>(ciphertext);
 
   for (size_t i = 0; i < plaintext_len; ++i)
     ciphertext_ptr[i] = plaintext_ptr[i] ^ mask_ptr[i];
 }
 
+bool Encryptor::Crypt(bool do_encrypt,
+                      const base::StringPiece& input,
+                      std::string* output) {
+  DCHECK(key_);  // Must call Init() before En/De-crypt.
+  // Work on the result in a local variable, and then only transfer it to
+  // |output| on success to ensure no partial data is returned.
+  std::string result;
+  output->clear();
+
+  const EVP_CIPHER* cipher = GetCipherForKey(key_);
+  DCHECK(cipher);  // Already handled in Init();
+
+  const std::string& key = key_->key();
+  DCHECK_EQ(EVP_CIPHER_iv_length(cipher), iv_.length());
+  DCHECK_EQ(EVP_CIPHER_key_length(cipher), key.length());
+
+  ScopedCipherCTX ctx;
+  if (!EVP_CipherInit_ex(
+          ctx.get(), cipher, NULL, reinterpret_cast<const uint8_t*>(key.data()),
+          reinterpret_cast<const uint8_t*>(iv_.data()), do_encrypt))
+    return false;
+
+  // When encrypting, add another block size of space to allow for any padding.
+  const size_t output_size = input.size() + (do_encrypt ? iv_.size() : 0);
+  CHECK_GT(output_size, 0u);
+  CHECK_GT(output_size + 1, input.size());
+  uint8_t* out_ptr =
+      reinterpret_cast<uint8_t*>(base::WriteInto(&result, output_size + 1));
+  int out_len;
+  if (!EVP_CipherUpdate(ctx.get(), out_ptr, &out_len,
+                        reinterpret_cast<const uint8_t*>(input.data()),
+                        input.length()))
+    return false;
+
+  // Write out the final block plus padding (if any) to the end of the data
+  // just written.
+  int tail_len;
+  if (!EVP_CipherFinal_ex(ctx.get(), out_ptr + out_len, &tail_len))
+    return false;
+
+  out_len += tail_len;
+  DCHECK_LE(out_len, static_cast<int>(output_size));
+  result.resize(out_len);
+
+  output->swap(result);
+  return true;
+}
+
+bool Encryptor::CryptCTR(bool do_encrypt,
+                         const base::StringPiece& input,
+                         std::string* output) {
+  if (!counter_.get()) {
+    LOG(ERROR) << "Counter value not set in CTR mode.";
+    return false;
+  }
+
+  AES_KEY aes_key;
+  if (AES_set_encrypt_key(reinterpret_cast<const uint8_t*>(key_->key().data()),
+                          key_->key().size() * 8, &aes_key) != 0) {
+    return false;
+  }
+
+  const size_t out_size = input.size();
+  CHECK_GT(out_size, 0u);
+  CHECK_GT(out_size + 1, input.size());
+
+  std::string result;
+  uint8_t* out_ptr =
+      reinterpret_cast<uint8_t*>(base::WriteInto(&result, out_size + 1));
+
+  uint8_t ivec[AES_BLOCK_SIZE] = { 0 };
+  uint8_t ecount_buf[AES_BLOCK_SIZE] = { 0 };
+  unsigned int block_offset = 0;
+
+  counter_->Write(ivec);
+
+  AES_ctr128_encrypt(reinterpret_cast<const uint8_t*>(input.data()), out_ptr,
+                     input.size(), &aes_key, ivec, ecount_buf, &block_offset);
+
+  // AES_ctr128_encrypt() updates |ivec|. Update the |counter_| here.
+  SetCounter(base::StringPiece(reinterpret_cast<const char*>(ivec),
+                               AES_BLOCK_SIZE));
+
+  output->swap(result);
+  return true;
+}
+
 }  // namespace crypto