[英]Base64 encode a XXTEA encrypted string error
I would like to secure my data so I try to encrypt it with XXTEA. 我想保护我的数据,所以我尝试使用XXTEA对其进行加密。 I do this way:
我这样做:
Everything is encrypt and decrypt ok. 一切都可以加密和解密了。 But when I try to make a base64 encode the output after XXTEA encrypt it and base64 decode it before XXTEA decrypt, the result is wrong:
但是,当我尝试在XXTEA加密输出并使其在XXTEA解密之前将base64解码后,使base64编码输出时,结果是错误的:
When I test with http://www.tools4noobs.com/online_tools/xxtea_encrypt/ and http://www.tools4noobs.com/online_tools/xxtea_decrypt/ 当我使用http://www.tools4noobs.com/online_tools/xxtea_encrypt/和http://www.tools4noobs.com/online_tools/xxtea_decrypt/进行测试时
My example's input string is hello
and its final result is bjz/S2f3Xkxr08hu
我的示例的输入字符串是
hello
,其最终结果是bjz/S2f3Xkxr08hu
But when I test with my code (see below), the final result is bjz/Sw==
但是当我用我的代码进行测试(见下文)时,最终结果是
bjz/Sw==
Here is my encryption code
: 这是我的
encryption code
:
std::string ProjectUtils::encrypt_data_xxtea(std::string input, std::string secret) {
//Encrypt with XXTEA
xxtea_long retLength = 0;
unsigned char data[input.length()];
strncpy((char*)data, input.c_str(), sizeof(data));
xxtea_long dataLength = (xxtea_long) sizeof(data);
unsigned char key[secret.length()];
strncpy((char*)key, secret.c_str(), sizeof(key));
xxtea_long keyLength = (xxtea_long) sizeof(key);
unsigned char *encryptedData = xxtea_encrypt(data, dataLength, key, keyLength, &retLength);
//Encode base64
char* out = NULL;
base64Encode(encryptedData, sizeof(encryptedData), &out);
CCLOG("xxtea encrypted data: %s", out);
return out;
} }
Here is my decryption code
: 这是我的
decryption code
:
char* ProjectUtils::decrypt_data_xxtea(std::string input, std::string secret) {
//Decode base64
unsigned char* output = NULL;
base64Decode((unsigned char*)input.c_str(), (unsigned int)strlen(input.c_str()), &output);
xxtea_long dataLength = (xxtea_long) sizeof(output);
xxtea_long retLength = 0;
unsigned char key[secret.length()];
strncpy((char*)key, secret.c_str(), sizeof(key));
xxtea_long keyLength = (xxtea_long) sizeof(key);
//Decrypt with XXTEA
char *decryptedData = reinterpret_cast<char*>(xxtea_decrypt(output, dataLength, key, keyLength, &retLength));
CCLOG("xxtea decrypted data: %s", decryptedData);
return decryptedData;
} }
Do you know what is wrong with my code? 您知道我的代码有什么问题吗? Any help would be appreciated!
任何帮助,将不胜感激! Thanks very much.
非常感谢。
here is full working code on cocos2d-x 3.4 这是cocos2d-x 3.4的完整工作代码
std::string UserProfile::encryptString(std::string input, std::string secret) {
//Encrypt with XXTEA
xxtea_long retLength = 0;
unsigned char data[input.length()];
strncpy((char*)data, input.c_str(), sizeof(data));
xxtea_long dataLength = (xxtea_long) sizeof(data);
unsigned char key[secret.length()];
strncpy((char*)key, secret.c_str(), sizeof(key));
xxtea_long keyLength = (xxtea_long) sizeof(key);
unsigned const char *encryptedData = reinterpret_cast<unsigned const char*>(xxtea_encrypt(data, dataLength, key, keyLength, &retLength));
char* out = NULL;
cocos2d::base64Encode(encryptedData, retLength, &out); // use real length returned by xxtea_encrypt
CCLOG("xxtea encrypted data: [%s][%s]", encryptedData, out);
std::string outStr(out); // make string object
CCLOG("xxtea encrypted data: [%s][%s]", encryptedData, outStr.c_str());
setStr(KEY, outStr); // function that store value in user defaults
std::string revertStr = getStr(KEY); // get string value back
CCLOG("xxtea revertStr: [%s]", revertStr.c_str());
unsigned char* output = NULL;
int outLength = cocos2d::base64Decode((unsigned char*)revertStr.c_str(), (unsigned int)strlen(revertStr.c_str()), &output); // get real length of decoded string
char *decryptedData = reinterpret_cast<char*>(xxtea_decrypt(output, outLength, key, keyLength, &retLength)); // use it
CCLOG("xxtea decrypted data: %s", decryptedData); // string the same as original for me
return "";
}
thanks for your code, it works for me) 感谢您的代码,它对我有用)
I have replaced length of base64 string by actual retLength 我已经用实际的retLength替换了base64字符串的长度
base64Encode(encryptedData, retLength, &out);
and back, get actual size as well 然后返回实际尺寸
int outLength = cocos2d::base64Decode((unsigned char*)revertStr.c_str(), (unsigned int)strlen(revertStr.c_str()), &output);
char *decryptedData = reinterpret_cast<char*>(xxtea_decrypt(output, outLength, key, keyLength, &retLength));
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