我在for循环中遇到问题。我试图在加密函数中传递文件来加密文件以及解密功能。我被困在如何传递文件。我搜索了如何传递文件，但我找不到解决这个问题的好资源。我找到了这个链接How to decrypt file in Java encrypted with openssl command using AES? 但我无法理解。任何帮助，将不胜感激。 谢谢
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
public class AES {
int mul = 0;
long begin, end;
SecretKey myAesKey;
Cipher aesCipher;
/**
* @param args
*/
public static void main(String[] args) {
AES demo = new AES();
}
public AES() {
// File file = new File("plainText.txt");
// FileReader fr = null;
BufferedReader br = null;
// try {
String currentLine;
// //fr = new FileReader();
// } catch (FileNotFoundException e1) {
// // TODO Auto-generated catch block
// e1.printStackTrace();
// }
byte[] key = "01234567".getBytes();
byte[] plain = "A message".getBytes();
File file = new File("plainText.txt");
FileReader fr = null;
try {
fr = new FileReader(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
br = new BufferedReader(fr);
String cipher_text;
long totaltime = 0;
long begin;
int i = 0;
// do operation 1000 times...
for (i = 0; i < 1000; i++) {
begin = System.currentTimeMillis();
try {
initiateAES();
cipher_text = Encrypt(aesCipher, br.readLine(),
myAesKey).toString();
System.out.println(cipher_text);
currentLine = Decrypt(aesCipher, cipher_text,
myAesKey).toString();
System.out.println(new String(currentLine, "UTF-8"));
} catch (Exception ex) {
System.out.println(ex);
}
// do operation that you want to time in here.....
totaltime += System.currentTimeMillis() - begin;
}
// at end take average nano seconds.
System.out.println("time:" + totaltime / i);
}
private void initiateAES() {
try {
// create a random 128 bit key
KeyGenerator keygenerator = KeyGenerator.getInstance("AES");
keygenerator.init(128);
myAesKey = keygenerator.generateKey();
// Create the cipher
aesCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
} catch (Exception ex) {
}
}
private byte[] Encrypt(Cipher cipher, String b, SecretKey key)
throws Exception {
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher.doFinal();
}
private byte[] Decrypt(Cipher cipher, String r, SecretKey key)
throws Exception {
cipher.init(Cipher.DECRYPT_MODE, key,
new IvParameterSpec(cipher.getIV()));
return cipher.doFinal();
}
}