Java AES 加密示例

Question

当我尝试实现这段代码（用 Java 编写的 AES 算法）时，我在这些行中发现了一个错误：

import org.apache.commons.codec.binary.Base64;

            setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));

            setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));

主要代码是：

package trytry;


import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.print.DocFlavor.STRING;

import org.apache.commons.codec.binary.Base64;



public class AES
{

    
    private static SecretKeySpec secretKey ;
    private static byte[] key ;
    
    private static String decryptedString;
    private static String encryptedString;
 
    
    public static void setKey(String myKey){
        
   
        MessageDigest sha = null;
        try {
            key = myKey.getBytes("UTF-8");
            System.out.println(key.length);
            sha = MessageDigest.getInstance("SHA-1");
            key = sha.digest(key);
            key = Arrays.copyOf(key, 16); // use only first 128 bit
            System.out.println(key.length);
            System.out.println(new String(key,"UTF-8"));
            secretKey = new SecretKeySpec(key, "AES");
            
            
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
              
    

    }
    
    public static String getDecryptedString() {
        return decryptedString;
    }

    public static void setDecryptedString(String decryptedString) {
        AES.decryptedString = decryptedString;
    }

    public static String getEncryptedString() {
        return encryptedString;
    }

    public static void setEncryptedString(String encryptedString) {
        AES.encryptedString = encryptedString;
    }

    public static String encrypt(String strToEncrypt)
    {
        try
        {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        
         
            setEncryptedString(Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes("UTF-8"))));
        
        }
        catch (Exception e)
        {
           
            System.out.println("Error while encrypting: "+e.toString());
        }
        return null;

    }

    public static String decrypt(String strToDecrypt)
    {
        try
        {
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
           
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
            setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));
            
        }
        catch (Exception e)
        {
         
            System.out.println("Error while decrypting: "+e.toString());

        }
        return null;
    }


    public static void main(String args[])
    {
 
                final String strToEncrypt = "My text to encrypt";
                final String strPssword = "encryptor key";
                AES.setKey(strPssword);
               
                AES.encrypt(strToEncrypt.trim());
                
                System.out.println("String to Encrypt: " + strToEncrypt); 
                System.out.println("Encrypted: " + AES.getEncryptedString());
           
                final String strToDecrypt =  AES.getEncryptedString();
                AES.decrypt(strToDecrypt.trim());
               
                System.out.println("String To Decrypt : " + strToDecrypt);
                System.out.println("Decrypted : " + AES.getDecryptedString());
        
    }
     
}

只是为了知道我尝试添加：JRE 系统库但不起作用。

Answer 1

也许

setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt))));

应该

setDecryptedString(new String(cipher.doFinal(Base64.decodeBase64(strToDecrypt)),
    Charset.forName("UTF-8")));

我怀疑它会有所作为，但是如果您在加密方面是明确的（并且您应该这样做），那么您应该在解密方面是明确的。

在任何情况下，比“我发现错误”或“我有错误”更具描述性的东西都会非常有帮助。 （异常和堆栈跟踪或 Eclipse 和/或编译器错误消息。）