问题描述
我正在尝试使用AES / CBC算法加密512 Mb文件。这大约需要7秒的时间。如何减少加密时间并使之更快。
我正在使用固定密钥,并尝试使用CipherOutStream以及cipher.update()而不是cipher.dofinal()。不过,它仍然需要大约7秒钟。
使用以下加密方法来加密512 MB文件通常需要花费多少时间。在配备16 GB内存和2 GHz四核Intel Core i5处理器的Mac上,我花了6秒钟。我正在使用JDK 11执行。这是正常现象还是我的代码响应缓慢。我应该担心吗?如何缩短加密时间。
package com.encrypterdecrypter;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.io.ClassPathResource;
import javax.crypto.Cipher;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.SecretKeySpec;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
@SpringBootApplication
public class DemoApplication {
private static final String SECRET_KEY = "aesencryptionKey";
private static final String initVector = "encryptionIntVec";
public static void main(String[] args) throws Exception {
SpringApplication.run(DemoApplication.class,args);
File inputFile = new ClassPathResource("fivetwelvemb.zip").getFile();
InputStream inputStream = new FileInputStream(inputFile);
SecretKeySpec secretkey = new SecretKeySpec(SECRET_KEY.getBytes("UTF-8"),"AES");
long startTime = System.currentTimeMillis();
OutputStream encryptStream = encryptDecryptBinary(inputStream,Cipher.ENCRYPT_MODE,secretkey);
long endTime = System.currentTimeMillis();
System.out.println("Encryption Time in ms : " + (endTime - startTime));
}
public static OutputStream encryptDecryptBinary(InputStream inputStream,int encryptMode,SecretKeySpec secretkey) throws Exception {
Cipher aesCipher = Cipher.getInstance("AES/CBC/nopadding");
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
aesCipher.init(encryptMode,secretkey);
OutputStream out = new ByteArrayOutputStream();
CipherOutputStream cipherOutputStream = new CipherOutputStream(out,aesCipher);
/* byte[] encryptedData = aesCipher.doFinal(inputStream.readAllBytes()); */
byte[] buf = new byte[8192];
int numRead = 0;
while ((numRead = inputStream.read(buf)) >= 0) {
cipherOutputStream.write(buf,numRead);
}
cipherOutputStream.close();
return out;
}
}
```
解决方法
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