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AES#xff08;高级加密标准#xff09;、DES#xff08;数据加密标准#xff09;、MD5#xff08;消息摘要算法5#xff09;和SHA-1#xff08;安全哈希算法1#xff09;都是常见的加密算法#xff0c;用于数据加密和哈希计算。
二、加密算法实现
1、创建…一、前言
AES高级加密标准、DES数据加密标准、MD5消息摘要算法5和SHA-1安全哈希算法1都是常见的加密算法用于数据加密和哈希计算。
二、加密算法实现
1、创建加密函数
java代码实现方式
package com.yuanrenxue.course6;import android.util.Base64;import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.MessageDigest;import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;public class CryptoUtils implements ICryptoUtils {Overridepublic String aesEncrypt(String key, String iv, String content) throws Exception {// 密钥和IV的处理SecretKeySpec keySpec new SecretKeySpec(key.getBytes(), AES);// Cipher对象的初始化获取Cipher对象指定了AES算法、CBC模式和PKCS5填充。Cipher cipher Cipher.getInstance(AES/CBC/PKCS5Padding);// iv 偏移量IvParameterSpec ivSpec new IvParameterSpec(iv.getBytes());// 初始化cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);// 加密byte[] bytes cipher.doFinal(content.getBytes());return Base64.encodeToString(bytes, Base64.DEFAULT);}Overridepublic String aesDecrypt(String key, String iv, String content) throws Exception {// 密钥和IV的处理SecretKeySpec keySpec new SecretKeySpec(key.getBytes(), AES);// Cipher对象的初始化获取Cipher对象指定了AES算法、CBC模式和PKCS5填充。Cipher cipher Cipher.getInstance(AES/CBC/PKCS5Padding);// iv 偏移量IvParameterSpec ivSpec new IvParameterSpec(iv.getBytes());// 初始化cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);// 解密byte[] bytes cipher.doFinal(Base64.decode(content, Base64.DEFAULT));return new String(bytes);}Overridepublic String desEncrypt(String key, String content) throws Exception {// 密钥处理SecretKeySpec keySpec new SecretKeySpec(key.getBytes(), DES);// Cipher对象的初始化获取Cipher对象指定了AES算法、CBC模式和PKCS5填充。Cipher cipher Cipher.getInstance(DES/ECB/PKCS5Padding);// 初始化cipher.init(Cipher.ENCRYPT_MODE, keySpec);// 加密byte[] bytes cipher.doFinal(content.getBytes());return Base64.encodeToString(bytes, Base64.DEFAULT);}Overridepublic String desDecrypt(String key, String content) throws Exception {// 密钥处理SecretKeySpec keySpec new SecretKeySpec(key.getBytes(), DES);// Cipher对象的初始化获取Cipher对象指定了AES算法、CBC模式和PKCS5填充。Cipher cipher Cipher.getInstance(DES/ECB/PKCS5Padding);// 初始化cipher.init(Cipher.DECRYPT_MODE, keySpec);// 解密byte[] bytes cipher.doFinal(Base64.decode(content, Base64.DEFAULT));return new String(bytes);}Overridepublic String getMD5(String content) throws Exception {// 得到摘要实例MessageDigest md MessageDigest.getInstance(MD5);// 摘要运算byte[] digest md.digest(content.getBytes());// 返回16进制字符串return new BigInteger(1, digest).toString(16);}Overridepublic String getSHA1(String content) throws Exception {// 得到摘要实例MessageDigest md MessageDigest.getInstance(SHA1);// 摘要运算byte[] digest md.digest(content.getBytes());// 返回16进制字符串return new BigInteger(1, digest).toString(16);// 第二种写法// md.update(content.getBytes());// md.update(content2.getBytes());// md.update(content3.getBytes());// return new BigInteger(1, md.digest()).toString(16);}
}
2、hook 加密函数
java代码实现方式
package com.example.plugintest;import android.util.Log;import com.virjar.ratel.api.rposed.IRposedHookLoadPackage;
import com.virjar.ratel.api.rposed.RC_MethodHook;
import com.virjar.ratel.api.rposed.RposedHelpers;
import com.virjar.ratel.api.rposed.callbacks.RC_LoadPackage;import java.math.BigInteger;
import java.security.MessageDigest;import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;public class HookCryptoEntry implements IRposedHookLoadPackage {private static final String TAG plugintest--;Overridepublic void handleLoadPackage(RC_LoadPackage.LoadPackageParam lpparam) throws Throwable {System.out.println(TAG 包名是什么 lpparam.packageName);if (lpparam.packageName.equals(com.yuanrenxue.course6)) {System.out.println(TAG 确认hook的app是 lpparam.packageName);// 想hook这个new SecretKeySpec(key.getBytes(),AES);这里用的是findAndHookConstructor因为new ... 就是一个// 实例化的过程所以需要hook的是构造方法而不是普通方法RposedHelpers.findAndHookConstructor(SecretKeySpec.class, byte[].class, String.class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, String.format(SecretKeySpec(%s,%s)), new String((byte[]) param.args[0]), param.args[1]));}});// hook iv:new IvParameterSpec(iv.getBytes());RposedHelpers.findAndHookConstructor(IvParameterSpec.class, byte[].class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, String.format(IvParameterSpec(%s), new String((byte[]) param.args[0])));}});// hook 采用了什么加密算法:Cipher.getInstance(AES/CBC/PKCS5Padding)RposedHelpers.findAndHookMethod(Cipher.class, getInstance, String.class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, 发现使用如下加密算法: param.args[0]);}});// hook 加密解密过程cipher.doFinal(content.getBytes());RposedHelpers.findAndHookMethod(Cipher.class, doFinal, byte[].class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);// 对于加密来说入参明文返回值密文// 对于解密来说入参密文返回值明文 可以通过这来判断在加密还是在解密// 加密的返回值因为是随机的字节所以打印出来很可能是鬼画符一样的东西7sZO像这种是正常的Log.d(TAG, String.format(入参为%s,返回值为%s, new String((byte[]) param.args[0]), new String((byte[]) param.getResult())));}});// hook采用了哪种哈希函数摘要算法 MessageDigest.getInstance(MD5);RposedHelpers.findAndHookMethod(MessageDigest.class, getInstance, String.class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, 发现使用如下哈希函数: param.args[0]);}});// 对于摘要内容的hook// 1. md.digest(content.getBytes());RposedHelpers.findAndHookMethod(MessageDigest.class, digest, byte[].class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, 消息内容为: new String((byte[]) param.args[0]));Log.d(TAG, 摘要结果为: new String((byte[]) param.getResult()));Log.d(TAG, 摘要结果为: new BigInteger(1, (byte[]) param.getResult()).toString(16));}});// 2. md.update(content.getBytes());RposedHelpers.findAndHookMethod(MessageDigest.class, update, byte[].class, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, 2.消息内容为: new String((byte[]) param.args[0]));}});RposedHelpers.findAndHookMethod(MessageDigest.class, digest, new RC_MethodHook() {Overrideprotected void afterHookedMethod(MethodHookParam param) throws Throwable {super.afterHookedMethod(param);Log.d(TAG, 2.摘要结果为: new BigInteger(1, (byte[]) param.getResult()).toString(16));}});}}
}三、效果
