Question

如何能让spring框架加载加密后的.class文件

Answer 1

加密：使用AES加密，将文件的字节码读取，对字节码进行加密后替换源文件

Java代码

/**

*

* 字节加密

*/

public static byte[] encrypt(byte[] data, String key) throws Exception {

Key k = toKey(Base64.decode(key));

byte[] raw = k.getEncoded();

SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);

Cipher cipher = Cipher.getInstance(ALGORITHM);

cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);

return cipher.doFinal(data);

}
/**
*
* 字节加密
*/
public static byte[] encrypt(byte[] data, String key) throws Exception {
Key k = toKey(Base64.decode(key));
byte[] raw = k.getEncoded();
SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
return cipher.doFinal(data);
}

解密：

1、在tomcat的WebappClassLoader中修改源码（自动义类加载器）；

2、修改spring源码Code包源码。

加密方法

Java代码

public static byte[] decrypt(byte[] data, String key) throws Exception {

Key k = toKey(Base64.decode(key));

byte[] raw = k.getEncoded();

SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);

Cipher cipher = Cipher.getInstance(ALGORITHM);

cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);

return cipher.doFinal(data);

}
public static byte[] decrypt(byte[] data, String key) throws Exception {
Key k = toKey(Base64.decode(key));
byte[] raw = k.getEncoded();
SecretKeySpec secretKeySpec = new SecretKeySpec(raw, ALGORITHM);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
return cipher.doFinal(data);
}

在 WebappClassLoader中解密

Java代码

/**

* 判断如需是需要解密的类进行数据处理