在Java中使用DES进行文本/文件加密/解密
我有一个学校项目,我应该创建一个程序,可以用Java中的DES算法对文本和文件进行加密和解密。但我有一个问题-我不能在Base64中对加密文件进行编码,因为它是在ANSI中加密的。(例如¾捉;úV>úhXð9WØ)如何将文件的密文转换为Base64? 有人能帮我吗在Java中使用DES进行文本/文件加密/解密,java,file,encryption,base64,des,Java,File,Encryption,Base64,Des,我有一个学校项目,我应该创建一个程序,可以用Java中的DES算法对文本和文件进行加密和解密。但我有一个问题-我不能在Base64中对加密文件进行编码,因为它是在ANSI中加密的。(例如¾捉;úV>úhXð9WØ)如何将文件的密文转换为Base64? 有人能帮我吗 import javax.crypto.*; import javax.crypto.spec.IvParameterSpec; import java.io.*; import java.nio.charset.StandardC
import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Base64;
import java.util.Scanner;
public class Main
{
//creating an instance of the Cipher class for encryption
private static Cipher encrypt;
//creating an instance of the Cipher class for decryption
private static Cipher decrypt;
//initializing vector
private static final byte[] initialization_vector = { 22, 33, 11, 44, 55, 99, 66, 77 };
//main() method
public static void main(String[] args) throws NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException,
IllegalBlockSizeException, InvalidKeyException, InvalidAlgorithmParameterException, IOException {
Scanner user=new Scanner(System.in);
SecretKey scrtkey = KeyGenerator.getInstance("DES").generateKey();
AlgorithmParameterSpec aps = new IvParameterSpec(initialization_vector);
encrypt=Cipher.getInstance("DES/CBC/PKCS5Padding");
decrypt= Cipher.getInstance("DES/CBC/PKCS5Padding");
// Initialize the cipher for encryption and decryption
encrypt.init(Cipher.ENCRYPT_MODE, scrtkey,aps);
decrypt.init(Cipher.DECRYPT_MODE, scrtkey,aps);
System.out.print("Choose between text or file: ");
String fromuser=user.nextLine();
fromuser=fromuser.toLowerCase();
if(fromuser.equals("text")){
text();
}
else if(fromuser.equals("file")){
file();
}
else
System.out.print("\nGabim!!!");
}
//----------------------------------------TEXT/FILE ENCRYPTION/DECRYPTION-----------------------------------------//
public static void text() throws BadPaddingException, IllegalBlockSizeException {
Scanner input=new Scanner(System.in);
System.out.print("Text:");
String plain=input.nextLine();
String encrypted = encrypt(encrypt, plain);
System.out.println("Encrypted text: " + encrypted);
String decrypted = decrypt(decrypt, encrypted);
System.out.println("Decrypted text: " + decrypted);
input.close();
}
public static void file() throws IOException {
Scanner input=new Scanner(System.in);
System.out.println("File to encrypt:");
String textFile=input.nextLine();
System.out.println("Where to save encrypted file:");
String encryptedData =input.nextLine();
System.out.println("Where to save decrypted file:");
String decryptedData = input.nextLine();
//calling encrypt() method to encrypt the file
encryption(new FileInputStream(textFile), new FileOutputStream(encryptedData));
//calling decrypt() method to decrypt the file
decryption(new FileInputStream(encryptedData), new FileOutputStream(decryptedData));
//prints the statement if the program runs successfully
System.out.println("The encrypted and decrypted files have been created successfully.");
input.close();
}
//----------------------------------------TEXT ENCRYPTION/DECRYPTION----------------------------------------------//
public static String encrypt(Cipher cipher, String plainStr) throws BadPaddingException,IllegalBlockSizeException
{
byte[] plainBytes;
byte[] encryptedBytes;
plainBytes=plainStr.getBytes(StandardCharsets.UTF_8);
encryptedBytes=cipher.doFinal(plainBytes);
//return new String(encryptedBytes,StandardCharsets.ISO_8859_1);
return Base64.getEncoder().encodeToString(encryptedBytes);
}
public static String decrypt(Cipher cipher,String encryptedStr) throws BadPaddingException,IllegalBlockSizeException
{
byte[] encryptedBytes=Base64.getDecoder().decode(encryptedStr);
//byte[] encryptedBytes=encryptedStr.getBytes(StandardCharsets.ISO_8859_1);
byte[] decryptedBytes=cipher.doFinal(encryptedBytes);
return new String(decryptedBytes,StandardCharsets.UTF_8);
}
//---------------------------------------------FILES ENCRYPTION/DECRYPTION----------------------------------------//
//method for encryption
private static void encryption(InputStream input, OutputStream output)
throws IOException
{
output = new CipherOutputStream(output, encrypt);
//calling the writeBytes() method to write the encrypted bytes to the file
writeBytes(input, output);
}
//method for decryption
private static void decryption(InputStream input, OutputStream output)
throws IOException
{
input = new CipherInputStream(input, decrypt);
//calling the writeBytes() method to write the decrypted bytes to the file
writeBytes(input, output);
}
//method for writting bytes to the files
private static void writeBytes(InputStream input, OutputStream output)
throws IOException
{
byte[] writeBuffer = new byte[512];
int readBytes;
while ((readBytes = input.read(writeBuffer)) >= 0)
{
output.write(writeBuffer, 0, readBytes);
}
//closing the output stream
output.close();
//closing the input stream
input.close();
}
} ```
您正在对encrypt()
方法中的密文进行base64编码,那么问题出在哪里?