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

R=wtc
BUG=none
TEST=crypto_unittests


Review URL: http://codereview.chromium.org/7230037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@91800 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 48 insertions, 29 deletions

diff --git a/crypto/encryptor.cc b/crypto/encryptor.cc
index 59988f8..53e88f9 100644
--- a/crypto/encryptor.cc
+++ b/crypto/encryptor.cc
@@ -34,7 +34,7 @@ namespace crypto {
 
 /////////////////////////////////////////////////////////////////////////////
 // Encyptor::Counter Implementation.
-Encryptor::Counter::Counter(const std::string& counter) {
+Encryptor::Counter::Counter(const base::StringPiece& counter) {
   CHECK(sizeof(counter_) == counter.length());
 
   memcpy(&counter_, counter.data(), sizeof(counter_));
@@ -70,7 +70,7 @@ size_t Encryptor::Counter::GetLengthInBytes() const {
 /////////////////////////////////////////////////////////////////////////////
 // Partial Encryptor Implementation.
 
-bool Encryptor::SetCounter(const std::string& counter) {
+bool Encryptor::SetCounter(const base::StringPiece& counter) {
   if (mode_ != CTR)
     return false;
   if (counter.length() != 16u)
diff --git a/crypto/encryptor.h b/crypto/encryptor.h
index 712a19c..cfab6f28 100644
--- a/crypto/encryptor.h
+++ b/crypto/encryptor.h
@@ -10,6 +10,7 @@
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
+#include "base/string_piece.h"
 #include "build/build_config.h"
 #include "crypto/crypto_api.h"
 
@@ -34,7 +35,7 @@ class CRYPTO_API Encryptor {
   // Only 128-bits counter is supported in this class.
   class Counter {
    public:
-    Counter(const std::string& counter);
+    Counter(const base::StringPiece& counter);
     ~Counter();
 
     // Increment the counter value.
@@ -61,19 +62,19 @@ class CRYPTO_API Encryptor {
   // key or the initialization vector cannot be used.
   //
   // When |mode| is CTR then |iv| should be empty.
-  bool Init(SymmetricKey* key, Mode mode, const std::string& iv);
+  bool Init(SymmetricKey* key, Mode mode, const base::StringPiece& iv);
 
   // Encrypts |plaintext| into |ciphertext|.
-  bool Encrypt(const std::string& plaintext, std::string* ciphertext);
+  bool Encrypt(const base::StringPiece& plaintext, std::string* ciphertext);
 
   // Decrypts |ciphertext| into |plaintext|.
-  bool Decrypt(const std::string& ciphertext, std::string* plaintext);
+  bool Decrypt(const base::StringPiece& ciphertext, std::string* plaintext);
 
   // Sets the counter value when in CTR mode. Currently only 128-bits
   // counter value is supported.
   //
   // Returns true only if update was successful.
-  bool SetCounter(const std::string& counter);
+  bool SetCounter(const base::StringPiece& counter);
 
   // TODO(albertb): Support streaming encryption.
 
@@ -107,21 +108,21 @@ class CRYPTO_API Encryptor {
 
 #if defined(USE_OPENSSL)
   bool Crypt(bool encrypt,  // Pass true to encrypt, false to decrypt.
-             const std::string& input,
+             const base::StringPiece& input,
              std::string* output);
   std::string iv_;
 #elif defined(USE_NSS)
   bool Crypt(PK11Context* context,
-             const std::string& input,
+             const base::StringPiece& input,
              std::string* output);
   bool CryptCTR(PK11Context* context,
-                const std::string& input,
+                const base::StringPiece& input,
                 std::string* output);
   ScopedPK11Slot slot_;
   ScopedSECItem param_;
 #elif defined(OS_MACOSX)
   bool Crypt(int /*CCOperation*/ op,
-             const std::string& input,
+             const base::StringPiece& input,
              std::string* output);
 
   std::string iv_;
diff --git a/crypto/encryptor_mac.cc b/crypto/encryptor_mac.cc
index ff6e019..a08d09e 100644
--- a/crypto/encryptor_mac.cc
+++ b/crypto/encryptor_mac.cc
@@ -20,7 +20,9 @@ Encryptor::Encryptor()
 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) << "Unsupported mode of operation";
   CSSM_DATA raw_key = key->cssm_data();
@@ -33,12 +35,12 @@ bool Encryptor::Init(SymmetricKey* key, Mode mode, const std::string& iv) {
 
   key_ = key;
   mode_ = mode;
-  iv_ = iv;
+  iv.CopyToString(&iv_);
   return true;
 }
 
 bool Encryptor::Crypt(int /*CCOperation*/ op,
-                      const std::string& input,
+                      const base::StringPiece& input,
                       std::string* output) {
   DCHECK(key_);
   CSSM_DATA raw_key = key_->cssm_data();
@@ -65,11 +67,13 @@ bool Encryptor::Crypt(int /*CCOperation*/ op,
   return true;
 }
 
-bool Encryptor::Encrypt(const std::string& plaintext, std::string* ciphertext) {
+bool Encryptor::Encrypt(const base::StringPiece& plaintext,
+                        std::string* ciphertext) {
   return Crypt(kCCEncrypt, plaintext, ciphertext);
 }
 
-bool Encryptor::Decrypt(const std::string& ciphertext, std::string* plaintext) {
+bool Encryptor::Decrypt(const base::StringPiece& ciphertext,
+                        std::string* plaintext) {
   return Crypt(kCCDecrypt, ciphertext, plaintext);
 }
 
diff --git a/crypto/encryptor_nss.cc b/crypto/encryptor_nss.cc
index c53fc10..c4610903 100644
--- a/crypto/encryptor_nss.cc
+++ b/crypto/encryptor_nss.cc
@@ -41,7 +41,9 @@ Encryptor::Encryptor()
 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(CBC == mode || CTR == mode) << "Unsupported mode of operation";
 
@@ -75,7 +77,8 @@ bool Encryptor::Init(SymmetricKey* key, Mode mode, const std::string& iv) {
   return true;
 }
 
-bool Encryptor::Encrypt(const std::string& plaintext, std::string* ciphertext) {
+bool Encryptor::Encrypt(const base::StringPiece& plaintext,
+                        std::string* ciphertext) {
   ScopedPK11Context context(PK11_CreateContextBySymKey(GetMechanism(mode_),
                                                        CKA_ENCRYPT,
                                                        key_->key(),
@@ -89,7 +92,8 @@ bool Encryptor::Encrypt(const std::string& plaintext, std::string* ciphertext) {
     return Crypt(context.get(), plaintext, ciphertext);
 }
 
-bool Encryptor::Decrypt(const std::string& ciphertext, std::string* plaintext) {
+bool Encryptor::Decrypt(const base::StringPiece& ciphertext,
+                        std::string* plaintext) {
   if (ciphertext.empty())
     return false;
 
@@ -105,7 +109,8 @@ bool Encryptor::Decrypt(const std::string& ciphertext, std::string* plaintext) {
     return Crypt(context.get(), ciphertext, plaintext);
 }
 
-bool Encryptor::Crypt(PK11Context* context, const std::string& input,
+bool Encryptor::Crypt(PK11Context* context,
+                      const base::StringPiece& input,
                       std::string* output) {
   size_t output_len = input.size() + AES_BLOCK_SIZE;
   CHECK(output_len > input.size()) << "Output size overflow";
@@ -145,7 +150,8 @@ bool Encryptor::Crypt(PK11Context* context, const std::string& input,
   return true;
 }
 
-bool Encryptor::CryptCTR(PK11Context* context, const std::string& input,
+bool Encryptor::CryptCTR(PK11Context* context,
+                         const base::StringPiece& input,
                          std::string* output) {
   if (!counter_.get()) {
     LOG(ERROR) << "Counter value not set in CTR mode.";
diff --git a/crypto/encryptor_openssl.cc b/crypto/encryptor_openssl.cc
index 7b1e13f..6513181 100644
--- a/crypto/encryptor_openssl.cc
+++ b/crypto/encryptor_openssl.cc
@@ -52,7 +52,9 @@ Encryptor::Encryptor()
 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);
 
@@ -65,20 +67,22 @@ bool Encryptor::Init(SymmetricKey* key, Mode mode, const std::string& iv) {
 
   key_ = key;
   mode_ = mode;
-  iv_ = iv;
+  iv.CopyToString(&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
diff --git a/crypto/encryptor_win.cc b/crypto/encryptor_win.cc
index 8bbd6b8..088c9e5 100644
--- a/crypto/encryptor_win.cc
+++ b/crypto/encryptor_win.cc
@@ -37,7 +37,9 @@ Encryptor::Encryptor()
 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) << "Unsupported mode of operation";
 
@@ -77,7 +79,8 @@ bool Encryptor::Init(SymmetricKey* key, Mode mode, const std::string& iv) {
   return true;
 }
 
-bool Encryptor::Encrypt(const std::string& plaintext, std::string* ciphertext) {
+bool Encryptor::Encrypt(const base::StringPiece& plaintext,
+                        std::string* ciphertext) {
   DWORD data_len = plaintext.size();
   DWORD total_len = data_len + block_size_;
 
@@ -94,7 +97,8 @@ bool Encryptor::Encrypt(const std::string& plaintext, std::string* ciphertext) {
   return true;
 }
 
-bool Encryptor::Decrypt(const std::string& ciphertext, std::string* plaintext) {
+bool Encryptor::Decrypt(const base::StringPiece& ciphertext,
+                        std::string* plaintext) {
   DWORD data_len = ciphertext.size();
   if (data_len == 0)
     return false;