怎么能让spring框架加载加密后的.class文件
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发布时间：2022-04-21 04:23
共1个回答
热心网友
时间：2022-06-17 23:21
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(Base.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(Base.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(Base.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(Base.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
* */
//--------------------------------------start----------------------------------//
byte []data=null;
try {
if(isDecode(name)){
System.out.println("2818:--&&&-"+name);
data=AESUtils.decrypt(entry.binaryContent, key);
}else{
data=entry.binaryContent;
}
} catch (Exception e) {
e.printStackTrace();
}
try {
clazz = defineClass(name, data, 0,
data.length,
new CodeSource(entry.codeBase, entry.certificates));
//--------------------------------------end----------------------------------//
/**
* 判断如需是需要解密的类进行数据处理
* */
//--------------------------------------start----------------------------------//
byte []data=null;
try {
if(isDecode(name)){
System.out.println("2818:--&&&-"+name);
data=AESUtils.decrypt(entry.binaryContent, key);
}else{
data=entry.binaryContent;
}
} catch (Exception e) {
e.printStackTrace();
}
try {
clazz = defineClass(name, data, 0,
data.length,
new CodeSource(entry.codeBase, entry.certificates));
//--------------------------------------end----------------------------------//
在spring的code包的SimpleMetadataReader修改器构造函数
Java代码
// TODO 修改源码判断是否需要解密
SimpleMetadataReader(Resource resource, ClassLoader classLoader)
throws IOException {
InputStream is = resource.getInputStream();
ClassReader classReader = null;
try {
String name = "";
if (resource.getURI().toString().indexOf("jar:file") == -1) {
name = resource.getFile().getAbsolutePath();
if (!"".equals(name) && isDecode(name, cams)) {
byte[] data = inputStreamToByte(is);
try {
is = new ByteArrayInputStream(AESUtils.decrypt(data,
key));
// is = new ByteArrayInputStream(data);
} catch (Exception e) {
e.printStackTrace();
}
}
}
classReader = new ClassReader(is);
} finally {
is.close();
}
// TODO 修改源码判断是否需要解密
SimpleMetadataReader(Resource resource, ClassLoader classLoader)
throws IOException {
InputStream is = resource.getInputStream();
ClassReader classReader = null;
try {
String name = "";
if (resource.getURI().toString().indexOf("jar:file") == -1) {
name = resource.getFile().getAbsolutePath();
if (!"".equals(name) && isDecode(name, cams)) {
byte[] data = inputStreamToByte(is);
try {
is = new ByteArrayInputStream(AESUtils.decrypt(data,
key));
// is = new ByteArrayInputStream(data);
} catch (Exception e) {
e.printStackTrace();
}
}
}
classReader = new ClassReader(is);
} finally {
is.close();
}
在LocalVariableTableParameterNameDiscoverer同样需要进行解密。
注：(此加密有弊端)
1、加密解密算法需保持一致。
2、加密加密密钥需是同一密钥。
