无法使用AES 256bit解密解密包含+符号的文本：javax.crypto.BadPaddingException：给定最终块未正确填充 [英] Unable to Decrypt a text containg + symbol using AES 256bit Decryption:javax.crypto.BadPaddingException: Given final block not properly padded

问题描述

我无法在JSP页面内解密含有'+'符号的文本，我收到以下错误javax.crypto.BadPaddingException：给定最终块未正确填充。 >

但是，如果我从Eclipse运行或者将代码转换为可执行Jar，代码可以正常工作。

JARS used：
local_policy.jar
US_export_policy.jar

以下是我的Java代码

  import java.security.Key; 
 
 import javax.crypto.Cipher; 
 import javax.crypto.spec.SecretKeySpec; 
 
 import sun.misc.BASE64Decoder; 
 import sun.misc.BASE64Encoder; 
 
 public class Decrypt256bit {
 
 private static Key key; 
 
私有静态密码密码; 
 
 static {
 key = new SecretKeySpec（P @ ssw0Rd！@＃**&&& P @ ssw0Rd！@＃**&&&。 getBytes（），AES）; 
 try {
 cipher = Cipher.getInstance（AES / ECB / PKCS5PADDING，SunJCE）; 
} catch（Exception e）{
 e.printStackTrace（）; 
} 
} 
 
 public static String encryptData（String plainText）{
 try {
 cipher.init（Cipher.ENCRYPT_MODE，key）; 
 byte [] encrypted = cipher.doFinal（plainText.getBytes（））; 
返回新的BASE64Encoder（）。encode（encrypted）; 
} catch（Exception e）{
 throw new IllegalArgumentException（e）; 
} 
} 
 
 public static String decryptData（String encryptedValue）{
 try {
 cipher.init（Cipher.DECRYPT_MODE，key）; 
 byte [] decordedValue = new BASE64Decoder（）。decodeBuffer（encryptedValue）; 
 int maxKeyLen = Cipher.getMaxAllowedKeyLength（AES）; 
 System.out.println（Length ===+ maxKeyLen）; 
 return new String（cipher.doFinal（decordedValue））; 
} catch（Exception e）{
 throw new IllegalArgumentException（e）; 
} 
} 
  

解决方案

不能说Java代码，但是Base64字符串在QueryString中通常是无效的。如果传递QueryString上的数据，您将需要URL编码Base64编码数据。此外，加号 + 在QueryString中具有语义含义。 URL的另一个原因是编码你的数据（可能是你的问题的原因。）

String data = URLEncoder.encode（myBase64）;

Hi I am not able to decrypt a text containing '+' symbol inside the JSP page, I get the following error javax.crypto.BadPaddingException: Given final block not properly padded.

However the code works fine if I run from Eclipse or if I convert the code into Executable Jar.

JARS used : local_policy.jar US_export_policy.jar

Below is my Java code

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Decrypt256bit {

private static Key key;

private static Cipher cipher;

static {
    key = new SecretKeySpec("P@ssw0Rd!@#**&&&P@ssw0Rd!@#**&&&".getBytes(), "AES");
    try {
        cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING","SunJCE");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static String encryptData(String plainText) {
    try {
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encrypted = cipher.doFinal(plainText.getBytes());
        return new BASE64Encoder().encode(encrypted);
    } catch (Exception e) {
        throw new IllegalArgumentException(e);
    }
}

public static String decryptData(String encryptedValue) {
    try {
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedValue);
        int maxKeyLen = Cipher.getMaxAllowedKeyLength("AES");
        System.out.println("Length==="+maxKeyLen);
        return new String(cipher.doFinal(decordedValue));
    } catch (Exception e) {
        throw new IllegalArgumentException(e);
    }
}

解决方案

I can't speak to the Java code but Base64 strings are frequently not valid across a QueryString. You will need to URL Encode your Base64 encoded data if passing the data on the QueryString. Also the plus sign + has a semantic meaning within the QueryString. Yet another reason to URL Encode your data (and possible cause of your issue.)

String data = URLEncoder.encode(myBase64);

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