Add support for GCM cipher suites from RFC 7714.

webrtc/base/helpers_unittest.cc

Index: webrtc/base/helpers_unittest.cc
diff --git a/webrtc/base/helpers_unittest.cc b/webrtc/base/helpers_unittest.cc
index 83cc68591995b5dfdcb2331e84ac0f3d006ce693..e4903f58694b83613b8d4c9748e7d57839d1981f 100644
--- a/webrtc/base/helpers_unittest.cc
+++ b/webrtc/base/helpers_unittest.cc
@@ -10,6 +10,7 @@
 
 #include <string>
 
+#include "webrtc/base/buffer.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/helpers.h"
 #include "webrtc/base/ssladapter.h"
@@ -43,6 +44,17 @@ TEST_F(RandomTest, TestCreateRandomString) {
   EXPECT_EQ(256U, random2.size());
 }
 
+TEST_F(RandomTest, TestCreateRandomData) {
+  static size_t kRandomDataLength = 32;
+  std::string random1;
+  std::string random2;
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random1));
+  EXPECT_EQ(kRandomDataLength, random1.size());
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random2));
+  EXPECT_EQ(kRandomDataLength, random2.size());
+  EXPECT_NE(0, memcmp(random1.data(), random2.data(), kRandomDataLength));
+}
+
 TEST_F(RandomTest, TestCreateRandomUuid) {
   std::string random = CreateRandomUuid();
   EXPECT_EQ(36U, random.size());
@@ -54,12 +66,24 @@ TEST_F(RandomTest, TestCreateRandomForTest) {
   EXPECT_EQ(2154761789U, CreateRandomId());
   EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
   EXPECT_EQ("41706e92-cdd3-46d9-a22d-8ff1737ffb11", CreateRandomUuid());
+  static size_t kRandomDataLength = 32;
+  std::string random;
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random));
+  EXPECT_EQ(kRandomDataLength, random.size());
+  Buffer expected("\xbd\x52\x2a\x4b\x97\x93\x2f\x1c"
+      "\xc4\x72\xab\xa2\x88\x68\x3e\xcc"
+      "\xa3\x8d\xaf\x13\x3b\xbc\x83\xbb"
+      "\x16\xf1\xcf\x56\x0c\xf5\x4a\x8b", kRandomDataLength);
+  EXPECT_EQ(0, memcmp(expected.data(), random.data(), kRandomDataLength));
 
   // Reset and make sure we get the same output.
   SetRandomTestMode(true);
   EXPECT_EQ(2154761789U, CreateRandomId());
   EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
   EXPECT_EQ("41706e92-cdd3-46d9-a22d-8ff1737ffb11", CreateRandomUuid());
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random));
+  EXPECT_EQ(kRandomDataLength, random.size());
+  EXPECT_EQ(0, memcmp(expected.data(), random.data(), kRandomDataLength));
 
   // Test different character sets.
   SetRandomTestMode(true);