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数据加密解密

2015-08-16 22:37 344 查看


【Cocos2d-x】数据加密解密

分类： Cocos2d-x2014-11-17
23:29 625人阅读 评论(1) 收藏 举报

目录(?)[+]

C++的Base64算法实现

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/* * base64.cpp * *  Created on: 30/04/2011 *      Author: nicholas */
#include "base64.h"#include <cctype>//#include <cstdint>#include <algorithm>
namespace base64{
namespace{
static const std::string BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
size_t encoded_size(size_t raw){	switch((raw*8)%6)	{		case 0:			return (raw*8)/6;		case 2:			return ((raw*8)/6) + 3;		case 4:			return ((raw*8)/6) + 2;	}	return raw;}
size_t decoded_size(size_t unpadded){	return (unpadded*6)/8;}
int base64_index(std::string::value_type c){	if(c >= 'A' && c <= 'Z')		return c-'A';	else if(c >= 'a' && c <= 'z')		return c-'a' + 26;	else if(c >= '0' && c <= '9')		return c-'0' + 52;	else if(c == '+')		return 62;	else if(c == '/')		return 63;	else		return -1;}
}
encode_t::encode_t(std::string::size_type size) : state(zero), remainder(0){	encoded.reserve(encoded_size(size));}
/*State zero	8 bits input, zero remaining from last	6 bits consumed, 2 remaining	=> twoState two	8 bits input, 2 remaining from last	4 bits consumed, 4 remaining	=> fourState four	8 bits input, 4 remaining from last	2 bits consumed, 6 remaining	6 bits input, 6 remaining from last	6 bits consumed, 0 remaining	=> zero */void encode_t::operator() (std::string::value_type c){	unsigned char value(0);	switch(state)	{		case zero:			value = (c & 0xfc) >> 2;			remainder = c & 0x3;			encoded.push_back(BASE64_CHARS[value]);			state = two;			break;		case two:			value = (remainder << 4) | ((c & 0xf0) >> 4);			remainder = c & 0xf;			encoded.push_back(BASE64_CHARS[value]);			state = four;			break;		case four:			value = (remainder << 2) | ((c & 0xc0) >> 6);			remainder = c & 0x3f;			encoded.push_back(BASE64_CHARS[value]);			value = remainder;			encoded.push_back(BASE64_CHARS[value]);			state = zero;			break;	}}
std::string encode_t::str(){	unsigned char value(0);	switch(state)	{		case zero:			break;		case two:			value = remainder << 4;			encoded.push_back(BASE64_CHARS[value]);			encoded.push_back('=');			encoded.push_back('=');			state = zero;			break;		case four:			value = remainder << 2;			encoded.push_back(BASE64_CHARS[value]);			encoded.push_back('=');			state = zero;			break;	}	return encoded;}
decode_t::decode_t(std::string::size_type size) : state(zero), remainder(0){	decoded.reserve(decoded_size(size));}
/*State zero	6 bits input, zero remaining from last	6 bits consumed, zero remaining	=> sixState six	6 bits input, 6 remaining from last	write 1 byte, 4 remaining	=> fourState four	6 bits input, 4 remaining from last	write 1 byte, 2 remaining	=> twoState two	6 bits input, 2 remaining from last	write 1 byte, 0 remaining	=> zero */void decode_t::operator() (std::string::value_type c){	unsigned char value(0);	int index = base64_index(c);	if(index == -1)		return;	switch(state)	{		case zero:			remainder = index;			state = six;			break;		case six:			value = (remainder << 2) | ((index & 0x30) >> 4);			remainder = index & 0xf;			decoded.push_back(value);			state = four;			break;		case four:			value = (remainder << 4) | ((index & 0x3c) >> 2);			remainder = index & 0x3;			decoded.push_back(value);			state = two;			break;		case two:			value = (remainder << 6) | index;			decoded.push_back(value);			state = zero;			break;	}}
std::string decode_t::str() const{	return decoded;}
std::string encode(const std::string& str){	return std::for_each(str.begin(), str.end(), encode_t(str.size())).str();}
std::string decode(const std::string& str){	size_t unpadded_size = str.size();	if(str.size() > 0 && str[str.size()-1] == '=')		unpadded_size -= 1;	if(str.size() > 1 && str[str.size()-2] == '=')		unpadded_size -= 1;
return std::for_each(str.begin(), str.end(), decode_t(unpadded_size)).str();}
}



来自CODE的代码片
base64.cpp


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/* * base64.h * *  Created on: 30/04/2011 *      Author: nicholas */
#ifndef BASE64_H_#define BASE64_H_#include <string>
namespace base64{
class encode_t{private:	enum	{		zero = 0,		two,		four	} state;	unsigned int remainder;	std::string encoded;public:	encode_t(std::string::size_type size);	void operator() (std::string::value_type c);	std::string str();};
class decode_t{private:	enum	{		zero = 0,		six,		four,		two	} state;	unsigned int remainder;	std::string decoded;public:	decode_t(std::string::size_type size);	void operator() (std::string::value_type c);	std::string str() const;};
/* * Encode the given string @str into its base64 representation */std::string encode(const std::string& str);
/* * Decode the base64 encoded string @str */std::string decode(const std::string& str);
}
#endif /* BASE64_H_ */



来自CODE的代码片
base64.h


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#include<iostream>#include"base64.h"
using namespace std;
int main (){    string str = "abcdefghijklmn.";    string out = base64::encode(str);        cout<<"src:"<<str<<endl;     cout<<"encode: "<<out<<endl;    cout<<"decode: "<<base64::decode(out)<<endl;            str = "中文.";    out = base64::encode(str);        cout<<endl<<"src:"<<str<<endl;    cout<<"encode: "<< out <<endl;    cout<<"decode: "<< base64::decode(out) <<endl;        system("pause");    return 1;    }



来自CODE的代码片
main.cpp


Android平台下使用Base64算法加密解密数据

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import com.example.base64.R;import android.app.Activity;import android.os.Bundle;import android.util.Base64;
public class MainActivity extends Activity {
@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);				String src = "abcdefjhijklmn.";		// 加密数据		String encode = Base64.encodeToString(src.getBytes(), Base64.DEFAULT);		// 解密数据		String decode = new String(Base64.decode(encode, Base64.DEFAULT));
System.out.println("src：" + src);		System.out.println("encode：" + encode);		System.out.println("decode：" + decode);	}}



来自CODE的代码片
MainActivity.java


数据库数据项加密

cocos2d-x中操作数据库的实现都封装在LocalStorage这个类中。使用的是sqlite3。

IOS、Win32平台的加密

1.base64.h和base64.cpp添加项目Classes目录下。

2.右键libExtensions项目，附加包含目录，把base64库所在目录添加到包含目录中，具体路径根据自己项目结构而定



3.修改localStorageSetItem方法，保存数据时加密数据，这里在win32平台下忽略加密操作是因为一般win32平台版本是用于内部测试的

[cpp] view
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void localStorageSetItem( const char *key, const char *value)

{

assert( _initialized );

// 加密数据

#if (CC_TARGET_PLATFORM != CC_PLATFORM_WIN32)

//CCLOG("key=%s src=%s", key, value);

std::string encodeStr = base64::encode(value);

value = encodeStr.c_str();

//CCLOG("key=%s encode=%s", key, value);

#endif

int ok = sqlite3_bind_text(_stmt_update, 1, key, -1, SQLITE_TRANSIENT);

ok |= sqlite3_bind_text(_stmt_update, 2, value, -1, SQLITE_TRANSIENT);

ok |= sqlite3_step(_stmt_update);

ok |= sqlite3_reset(_stmt_update);

if( ok != SQLITE_OK && ok != SQLITE_DONE)

printf("Error in localStorage.setItem()\n");

}

4.修改localStorageGetItem方法，获取数据时解密数据

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const char* localStorageGetItem( const char *key )

{

assert( _initialized );

int ok = sqlite3_reset(_stmt_select);

ok |= sqlite3_bind_text(_stmt_select, 1, key, -1, SQLITE_TRANSIENT);

ok |= sqlite3_step(_stmt_select);

const unsigned char *ret = sqlite3_column_text(_stmt_select, 0);

if( ok != SQLITE_OK && ok != SQLITE_DONE && ok != SQLITE_ROW)

printf("Error in localStorage.getItem()\n");

// 加密数据

#if (CC_TARGET_PLATFORM != CC_PLATFORM_WIN32)

//CCLOG("decode src=%s", ret);

if (ret)

{

std::string decodeStr = base64::decode((const char*)ret);

char* c = new char;

strcpy_s(c, decodeStr.size() + 1, decodeStr.c_str());

//CCLOG("key=%s decode=%s", key, c);

return c;

}

#endif

return (const char*)ret;

}

注意：c_str()方法返回的是string对象中保留的字符串指针，该指针的生命周期是跟随string对象的。也就是如果直接返回decodeStr.c_str()，返回的将是垃圾数据，因为decodeStr在函数结束后，已经被销毁了，指针所指向的是垃圾数据。

这种数据库加密方案存在以下几个问题：

1.如果别人知道我所使用的加密算法，然后通过程序计算出加密串，还是可以修改成功的。

2.数据库还是可以用相关工具打开，并查看数据表。

3.每次读写数据时，增加了加密解密的步骤，降低效率。

对于Cocos2d-x中数据库的加密有更好的解决办法，就是使用wxsqlite3，点击查看【集成wxSqlite3到Cocos2d-x】，这种数据库加密的实现是在初始化数据库的时候加密，运行时加载数据库时候调用相关api解密，加载完成后数据的读写效率和未加密时一样，相对比较高效。

Android平台的加密

从LocalStorage.cpp中使用的宏可以看出，这个实现在安卓平台下是无法使用的



安卓平台下的实现在：cocos2d-x-2.1.5\extensions\LocalStorage目录下的LocalStorageAndroid.cpp中。



从localStrorageInit的实现可以看出，它是通过jni调用了java层中org/cocos2dx/lib/Cocos2dxLocalStorage的静态方法init

在打包安卓版Cocos2d-x游戏时需要用到引擎的一个java库，在cocos2d-x-2.1.5\cocos2dx\platform\android\java目录下，Cocos2dxLocalStorage类就在这个库中。

修改这个类的setItem方法，在保存数据的时候加密

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public static void setItem(String key, String value) {

try {

// 加密数据

value = Base64.encodeToString(value.getBytes(), Base64.DEFAULT);

String sql = "replace into " + TABLE_NAME

+ "(key,value)values(?,?)";

mDatabase.execSQL(sql, new Object[] { key, value });

} catch (Exception e) {

e.printStackTrace();

}

}

修改这个类的getItem方法，在获取数据的时候解密

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public static String getItem(String key) {

String ret = null;

try {

String sql = "select value from " + TABLE_NAME + " where key=?";

Cursor c = mDatabase.rawQuery(sql, new String[] { key });

while (c.moveToNext()) {

// only return the first value

if (ret != null) {

Log.e(TAG, "The key contains more than one value.");

break;

}

ret = c.getString(c.getColumnIndex("value"));

}

c.close();

} catch (Exception e) {

e.printStackTrace();

}

// 解密数据

if (ret != null) {

ret = new String(Base64.decode(ret, Base64.DEFAULT));

}

return ret == null ? "" : ret;

}
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