QUIC/Crypto - Enabled curve25519 key exchange code.

R=wtc@chromium.org

BUG=


Review URL: https://chromiumcodereview.appspot.com/12740002

git-svn-id: http://src.chromium.org/svn/trunk/src/net@187161 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

quic/crypto/curve25519_key_exchange.cc

diff --git a/quic/crypto/curve25519_key_exchange.cc b/quic/crypto/curve25519_key_exchange.cc
index 9258dc1..a4c20fa 100644
--- a/quic/crypto/curve25519_key_exchange.cc
+++ b/quic/crypto/curve25519_key_exchange.cc
@@ -4,15 +4,10 @@
 
 #include "net/quic/crypto/curve25519_key_exchange.h"
 
-#include <string.h>
-
 #include "base/logging.h"
+#include "crypto/curve25519.h"
 #include "net/quic/crypto/quic_random.h"
 
-// TODO(rtenneti): Remove the following line after support for curve25519 is
-// added.
-#define crypto_scalarmult_curve25519_SCALARBYTES 32
-
 using base::StringPiece;
 using std::string;
 
@@ -27,39 +22,31 @@
 // static
 Curve25519KeyExchange* Curve25519KeyExchange::New(
     const StringPiece& private_key) {
-// TODO(rtenneti): Add support for curve25519.
-#if 0
-  crypto_scalarmult_curve25519_base(ka->public_key_, ka->private_key_);
   Curve25519KeyExchange* ka;
-
   // We don't want to #include the NaCl headers in the public header file, so
   // we use literals for the sizes of private_key_ and public_key_. Here we
   // assert that those values are equal to the values from the NaCl header.
   COMPILE_ASSERT(
-      sizeof(ka->private_key_) == crypto_scalarmult_curve25519_SCALARBYTES,
+      sizeof(ka->private_key_) == crypto::curve25519::kScalarBytes,
       header_out_of_sync);
   COMPILE_ASSERT(
-      sizeof(ka->public_key_) == crypto_scalarmult_curve25519_BYTES,
+      sizeof(ka->public_key_) == crypto::curve25519::kBytes,
       header_out_of_sync);
 
-  if (private_key.size() != crypto_scalarmult_curve25519_SCALARBYTES) {
+  if (private_key.size() != crypto::curve25519::kScalarBytes) {
     return NULL;
   }
 
   ka = new Curve25519KeyExchange();
   memcpy(ka->private_key_, private_key.data(),
-         crypto_scalarmult_curve25519_SCALARBYTES);
+         crypto::curve25519::kScalarBytes);
+  crypto::curve25519::ScalarBaseMult(ka->private_key_, ka->public_key_);
   return ka;
-#else
-  Curve25519KeyExchange* ka =  new Curve25519KeyExchange();
-  memset(ka->public_key_, 0, arraysize(ka->public_key_));
-  return ka;
-#endif
 }
 
 // static
 string Curve25519KeyExchange::NewPrivateKey(QuicRandom* rand) {
-  uint8 private_key[crypto_scalarmult_curve25519_SCALARBYTES];
+  uint8 private_key[crypto::curve25519::kScalarBytes];
   rand->RandBytes(private_key, sizeof(private_key));
 
   // This makes |private_key| a valid scalar, as specified on
@@ -73,23 +60,18 @@
 bool Curve25519KeyExchange::CalculateSharedKey(
     const StringPiece& peer_public_value,
     string* out_result) const {
-// TODO(rtenneti): Add support for curve25519.
-#if 0
-  if (peer_public_value.size() != crypto_scalarmult_curve25519_BYTES) {
+  if (peer_public_value.size() != crypto::curve25519::kBytes) {
     return false;
   }
 
-  uint8 result[crypto_scalarmult_curve25519_BYTES];
-  crypto_scalarmult_curve25519(
-      result, private_key_,
-      reinterpret_cast<const uint8*>(peer_public_value.data()));
+  uint8 result[crypto::curve25519::kBytes];
+  crypto::curve25519::ScalarMult(
+      private_key_,
+      reinterpret_cast<const uint8*>(peer_public_value.data()),
+      result);
   out_result->assign(reinterpret_cast<char*>(result), sizeof(result));
 
   return true;
-#else
-  out_result->assign("01234567", 8);
-  return true;
-#endif
 }
 
 StringPiece Curve25519KeyExchange::public_value() const {

quic/crypto/curve25519_key_exchange.h

diff --git a/quic/crypto/curve25519_key_exchange.h b/quic/crypto/curve25519_key_exchange.h
index f2285b4..77e78e8 100644
--- a/quic/crypto/curve25519_key_exchange.h
+++ b/quic/crypto/curve25519_key_exchange.h
@@ -39,10 +39,7 @@
  private:
   Curve25519KeyExchange();
 
-// TODO(rtenneti): Add support for curve25519.
-#if 0
   uint8 private_key_[32];
-#endif
   uint8 public_key_[32];
 };
 

quic/crypto/curve25519_key_exchange_test.cc

diff --git a/quic/crypto/curve25519_key_exchange_test.cc b/quic/crypto/curve25519_key_exchange_test.cc
index f731a5d..b1443aa 100644
--- a/quic/crypto/curve25519_key_exchange_test.cc
+++ b/quic/crypto/curve25519_key_exchange_test.cc
@@ -4,17 +4,20 @@
 
 #include "net/quic/crypto/curve25519_key_exchange.h"
 
+#include "base/memory/scoped_ptr.h"
+#include "base/string_piece.h"
 #include "net/quic/crypto/quic_random.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using base::StringPiece;
+using std::string;
+
 namespace net {
 namespace test {
 
 // SharedKey just tests that the basic key exchange identity holds: that both
 // parties end up with the same key.
 TEST(Curve25519KeyExchange, SharedKey) {
-// TODO(rtenneti): Add support for curve25519.
-#if 0
   QuicRandom* const rand = QuicRandom::GetInstance();
 
   for (int i = 0; i < 5; i++) {
@@ -34,7 +37,6 @@
     ASSERT_TRUE(bob->CalculateSharedKey(alice_public, &bob_shared));
     ASSERT_EQ(alice_shared, bob_shared);
   }
-#endif
 }
 
 }  // namespace test