CipherInputStream: increase buffers for speed

This increases speed of CipherInputStreamBenchmark from 606ms to 28.5ms.

Bug: 12246774
Change-Id: If61c0a055fe1b8e87909711b15d0441fcdbe46c7

1 files changed, 85 insertions, 0 deletions

diff --git a/benchmarks/src/benchmarks/regression/CipherInputStreamBenchmark.java b/benchmarks/src/benchmarks/regression/CipherInputStreamBenchmark.java
new file mode 100644
index 0000000..9dce12a
--- /dev/null
+++ b/benchmarks/src/benchmarks/regression/CipherInputStreamBenchmark.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2012 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package benchmarks.regression;
+
+import com.google.caliper.Param;
+import com.google.caliper.SimpleBenchmark;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.spec.AlgorithmParameterSpec;
+
+import javax.crypto.CipherInputStream;
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.crypto.Cipher;
+import javax.crypto.spec.IvParameterSpec;
+
+/**
+ * CipherInputStream benchmark.
+ */
+public class CipherInputStreamBenchmark extends SimpleBenchmark {
+
+    private static final int DATA_SIZE = 1024 * 1024;
+    private static final byte[] DATA = new byte[DATA_SIZE];
+
+    private static final int IV_SIZE = 16;
+    private static final byte[] IV = new byte[IV_SIZE];
+
+    static {
+        for (int i = 0; i < DATA_SIZE; i++) {
+            DATA[i] = (byte) i;
+        }
+        for (int i = 0; i < IV_SIZE; i++) {
+            IV[i] = (byte) i;
+        }
+    }
+
+    private SecretKey key;
+
+    private byte[] output = new byte[8192];
+
+    private Cipher cipherEncrypt;
+
+    private AlgorithmParameterSpec spec;
+
+    @Override protected void setUp() throws Exception {
+        KeyGenerator generator = KeyGenerator.getInstance("AES");
+        generator.init(128);
+        key = generator.generateKey();
+
+        spec = new IvParameterSpec(IV);
+
+        cipherEncrypt = Cipher.getInstance("AES/CBC/PKCS5Padding");
+        cipherEncrypt.init(Cipher.ENCRYPT_MODE, key, spec);
+    }
+
+    public void timeEncrypt(int reps) throws Exception {
+        for (int i = 0; i < reps; ++i) {
+            cipherEncrypt.init(Cipher.ENCRYPT_MODE, key, spec);
+            InputStream is = new CipherInputStream(new ByteArrayInputStream(DATA), cipherEncrypt);
+            while (is.read(output) != -1) {
+            }
+        }
+    }
+}