Properly initialize crypto engine to enable HWAES

Call CRYPTO_library_init to properly initialize crypto engine, which
enables AES-NI (Hardware AES) if it is supported by CPU.

Also added a performance benchmark test.

Closes #198.

Change-Id: I962a2da588d2f4f6cbe00c83ecc9a832db0e6042

packager/media/base/aes_cryptor.cc

@@ -7,6 +7,7 @@
 #include "packager/media/base/aes_cryptor.h"
 
 #include <openssl/aes.h>
+#include <openssl/crypto.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
 
@@ -31,7 +32,9 @@ namespace media {
 AesCryptor::AesCryptor(ConstantIvFlag constant_iv_flag)
     : aes_key_(new AES_KEY),
       constant_iv_flag_(constant_iv_flag),
-      num_crypt_bytes_(0) {}
+      num_crypt_bytes_(0) {
+  CRYPTO_library_init();
+}
 
 AesCryptor::~AesCryptor() {}
 

packager/media/base/aes_cryptor_unittest.cc

@@ -625,5 +625,40 @@ INSTANTIATE_TEST_CASE_P(CbcTestCases,
                         AesCbcCryptorVerificationTest,
                         ::testing::ValuesIn(kCbcTestCases));
 
+class AesPerformanceTest : public ::testing::Test {
+ public:
+  AesPerformanceTest()
+      : cbc_encryptor_(kNoPadding, AesCryptor::kUseConstantIv),
+        key_(kAesKey, kAesKey + arraysize(kAesKey)),
+        iv_(kAesIv, kAesIv + arraysize(kAesIv)) {}
+
+  void SetUp() override {
+    plaintext_.resize(0x10000);
+    for (size_t i = 0; i < plaintext_.size(); i++)
+      plaintext_[i] = static_cast<uint8_t>(i);
+  }
+
+ protected:
+  AesCbcEncryptor cbc_encryptor_;
+  AesCtrEncryptor ctr_encryptor_;
+  std::vector<uint8_t> key_;
+  std::vector<uint8_t> iv_;
+  std::vector<uint8_t> plaintext_;
+};
+
+TEST_F(AesPerformanceTest, AesCbc) {
+  ASSERT_TRUE(cbc_encryptor_.InitializeWithIv(key_, iv_));
+  std::vector<uint8_t> encrypted;
+  for (int i = 0; i < 0x100; i++)
+    ASSERT_TRUE(cbc_encryptor_.Crypt(plaintext_, &encrypted));
+}
+
+TEST_F(AesPerformanceTest, AesCtr) {
+  ASSERT_TRUE(ctr_encryptor_.InitializeWithIv(key_, iv_));
+  std::vector<uint8_t> encrypted;
+  for (int i = 0; i < 0x100; i++)
+    ASSERT_TRUE(ctr_encryptor_.Crypt(plaintext_, &encrypted));
+}
+
 }  // namespace media
 }  // namespace shaka