【发布时间】：2014-05-26 19:36:05
【问题描述】：
理论上我知道 BLOWFISH 比 AES 快得多。但我对 Java 8 平台和充气城堡库中的 1MB、5MB、10MB 等文件的 AES 和 BLOWFISH 进行了基准测试。在每个测试场景中，AES 都比河豚快。
我想知道我是否在某个地方犯了错误？
代码如下：
private static final int WARMUP_COUNT = 5;
private static final int FILE_LENGTH = 1024*512;
private static final int ITERATOR_COUNT = 1000;
private static final double TO_MSSECONDS = 1_000_000.0 * (ITERATOR_COUNT-WARMUP_COUNT);
static final private byte[] ivBytes = new byte[] { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
private static final IvParameterSpec ivSpec16bytes = new IvParameterSpec(ivBytes);
private static final IvParameterSpec ivSpec8bytes = new IvParameterSpec(Arrays.copyOfRange(ivBytes,0,8));
static String[] algosWithMode = {"AES/CBC/PKCS7Padding","Blowfish/CBC/PKCS7Padding","CAST5/CBC/PKCS7Padding","DES/CBC/PKCS7Padding","DESede/CBC/PKCS7Padding", "IDEA/CBC/PKCS7Padding","ARC4", };
static String[] algos = { "AES","Blowfish","CAST5","DES", "DESede","IDEA","ARC4" };
static int[] keylenngth = {128,128,128,56, 168,128,128 };
@SuppressWarnings("unused")
public static void main(String[] args) throws Exception {
if(ITERATOR_COUNT <= WARMUP_COUNT )
throw new Exception("iterator count must be greater than warm up count iterator: "+ITERATOR_COUNT
+" warmup count :" + WARMUP_COUNT);
Security.addProvider(new BouncyCastleProvider());
Key key = null;
byte[] plainText=null;
byte[] cipherText=null;
byte[] decryptedText=null;
long startTime;
DecimalFormat df = new DecimalFormat("0.000");
for (int k = 0; k < 7; k++) {
long timeDec = 0,timeEnc = 0,timekey = 0;
long maxtimeDec = 0,maxtimeEnc = 0,maxtimekey = 0;
long mintimeDec = Long.MAX_VALUE,mintimeEnc = Long.MAX_VALUE,mintimekey = Long.MAX_VALUE;
long topDec = 0,topEnc = 0,topkey = 0;
for (int i = 0; i < ITERATOR_COUNT; i++) {
SecureRandom random= new SecureRandom();
plainText = random.generateSeed(FILE_LENGTH);
startTime=System.nanoTime();
KeyGenerator keyGen = KeyGenerator.getInstance(algos[k]);
keyGen.init(keylenngth[k],random);
key=keyGen.generateKey();
timekey=System.nanoTime()-startTime;
Cipher cipher=cipher.getInstance(algosWithMode[k]);
if(k == 0){
cipher.init(Cipher.ENCRYPT_MODE, key,ivSpec16bytes);
}else if(k == 6){
cipher.init(Cipher.ENCRYPT_MODE, key);
}else{
cipher.init(Cipher.ENCRYPT_MODE, key,ivSpec8bytes);
}
startTime=System.nanoTime();
cipherText = cipher.doFinal(plainText);
timeEnc=System.nanoTime()-startTime;
if(k == 0){
cipher.init(Cipher.DECRYPT_MODE, key,ivSpec16bytes);
}else if(k== 6){
cipher.init(Cipher.DECRYPT_MODE, key);
}else {
cipher.init(Cipher.DECRYPT_MODE, key,ivSpec8bytes);
}
startTime=System.nanoTime();
cipher.doFinal(cipherText);
timeDec=System.nanoTime()-startTime;
if (i >= WARMUP_COUNT) {
if (maxtimeEnc < timeEnc)
maxtimeEnc = timeEnc;
if (maxtimeDec < timeDec)
maxtimeDec = timeDec;
if (maxtimekey < timekey)
maxtimekey = timekey;
if (mintimeEnc > timeEnc)
mintimeEnc = timeEnc;
if (mintimeDec > timeDec)
mintimeDec = timeDec;
if (mintimekey > timekey)
mintimekey = timekey;
topEnc += timeEnc;
topDec += timeDec;
topkey += timekey;
}
}
double avgEnc=topEnc/TO_MSSECONDS;
double avgDec=topDec/TO_MSSECONDS;
double avgKey=topkey/TO_MSSECONDS;
System.out.println("********************************************************"+algos[k]+"*****************************************************************");
System.out.println("Avg Enc :"+df.format(avgEnc)+" - "+" Avg Dec :"+df.format(avgDec)+"-"+" Avg Key :"+ df.format(avgKey));
System.out.println("Max Enc :"+df.format(maxtimeEnc/1_000_000.0)+" - "+" Max Dec :"+df.format(maxtimeDec/1_000_000.0)+"-"+" Max Key :"+ df.format(maxtimekey/1_000_000.0));
System.out.println("Min Enc :"+df.format(mintimeEnc/1_000_000.0)+" - "+" Min Dec :"+df.format(mintimeDec/1_000_000.0)+"-"+" Min Key :"+ df.format(mintimekey/1_000_000.0));
}
}
【问题讨论】：
-
有太多变量无法确定。除其他外，许多处理器在硬件中都有 AES，我不知道您使用的是什么处理器，也不知道 Bouncy Castle 是否可以使用加速。
-
我的测试环境：64 位 Windows 7 Professional service Pack 1、Intel(R) Core(TM) i7 3.40GHz、6GB RAM、Hotspot JVM，如果我使用 oracle 的内置 (sunJCE) 提供程序，结果没有改变。
-
您是如何使用 Bouncy 进行测试的？我可以看到你添加了提供程序，但你真的在使用它吗？
-
首先我这样编码 Cipher cipher=cipher.getInstance(algosWithMode[k],"BC");并且 AES 比 BLOWFISH 更快。而且我想知道是否有错误的弹性实现，我更改了代码 Cipher cipher=cipher.getInstance(algosWithMode[k],"sunJCE");但结果没有改变。
标签： java cryptography benchmarking encryption-symmetric