Use base::StringPiece for input parameters in Encryptor, rather than std::string

crypto/encryptor_openssl.cc

 // Copyright (c) 2011 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 "base/logging.h"
@@ skipping 34 matching lines @@
 }  // namespace
 
 Encryptor::Encryptor()
     : key_(NULL),
       mode_(CBC) {
 }
 
 Encryptor::~Encryptor() {
 }
 
-bool Encryptor::Init(SymmetricKey* key, Mode mode, const std::string& iv) {
+bool Encryptor::Init(SymmetricKey* key,
+                     Mode mode,
+                     const base::StringPiece& iv) {
   DCHECK(key);
   DCHECK_EQ(CBC, mode);
 
   EnsureOpenSSLInit();
   if (iv.size() != AES_BLOCK_SIZE)
     return false;
 
   if (GetCipherForKey(key) == NULL)
     return false;
 
   key_ = key;
   mode_ = mode;
   iv_ = iv;
   return true;
 }
 
-bool Encryptor::Encrypt(const std::string& plaintext, std::string* ciphertext) {
+bool Encryptor::Encrypt(const base::StringPiece& plaintext,
+                        std::string* ciphertext) {
   return Crypt(true, plaintext, ciphertext);
 }
 
-bool Encryptor::Decrypt(const std::string& ciphertext, std::string* plaintext) {
+bool Encryptor::Decrypt(const base::StringPiece& ciphertext,
+                        std::string* plaintext) {
   return Crypt(false, ciphertext, plaintext);
 }
 
 bool Encryptor::Crypt(bool do_encrypt,
-                      const std::string& input,
+                      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->swap(result);
 
   const EVP_CIPHER* cipher = GetCipherForKey(key_);
   DCHECK(cipher);  // Already handled in Init();
 
@@ skipping 26 matching lines @@
 
   out_len += tail_len;
   DCHECK_LE(out_len, static_cast<int>(output_size));
   result.resize(out_len);
 
   output->swap(result);
   return true;
 }
 
 }  // namespace crypto