I'm trying to encrypt a 512 Mb file with AES/CBC algorithm. It is taking around 7 sec which is too much. How to reduce the encryption time and make it faster.
I'm using a fixed key and tried using CipherOutStream as well as cipher.update() instead of cipher.dofinal(). Still, it is taking around 7 secs.
How much time generally it would take to encrypt a 512 MB file with the below encryption. It is taking 6 seconds for me on a Mac with 16 GB memory and 2 GHz Quad-Core Intel Core i5 processor. I'm using JDK 11 for execution. Is it normal or my code is responding slow. Should I be concerned? How to improve the time for encryption.
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, 0, numRead);
}
cipherOutputStream.close();
return out;
}
}
```
