-1

有人可以告诉我为什么解密开始搞砸了。它适用于短字符串，但正如您所看到的那样，它会变得混乱。我认为这与字符串转换有关。

std::string encrypt(const std::string& str_in, const std::string& key, const std::string& iv)
{

    std::string str_out;
    CryptoPP::CFB_Mode<CryptoPP::AES>::Encryption encryption((byte*)key.c_str(),    key.length(), (byte*)iv.c_str());
    CryptoPP::StringSource encryptor(str_in, true,
        new CryptoPP::StreamTransformationFilter(encryption,
            new CryptoPP::Base64Encoder(
                new CryptoPP::StringSink(str_out),
                false // do not append a newline
            )
        )
    );
    return str_out;
}


std::string decrypt(const std::string& str_in, const std::string& key, const std::string& iv)
{

    std::string str_out;    
    CryptoPP::CFB_Mode<CryptoPP::AES>::Decryption decryption((byte*)key.c_str(), key.length(), (byte*)iv.c_str());

    CryptoPP::StringSource decryptor(str_in, true,
        new CryptoPP::Base64Decoder(
            new CryptoPP::StreamTransformationFilter(decryption,
                new CryptoPP::StringSink(str_out)
            )
        )
    );
    return str_out;
}

这将是我的程序输出

key:qwertyuiopasdfghjklzxcvbnmqwerty
IV:0123456789123456

STR:I do not like green eggs and ham I do not like them Sam-I-Am. Try them, try them, and you may! Try them and you may, I say. I will not eat them in a house, i will not eat them with a mouse,i will not eat them in a box i will not eat them with a fox, i will not eat them here of there i will not eat them anywhere, I do not like green eggs and ham i do not like them sam i am

STR_ENCRYPTED: ffyHj0rFQ0fn+jJcuZAznaioo+2oqqq+7ayjqe2lrKBF8s6QLdosGuIXzz/+vL+Bz
c3Nzc3Nzc3Nzc3Nzc3Nzd78yyKlu7P47yMSlKi7AhEyLs55pj9nZcEIPPadhISD4bQSGVWiWGbEMr7Ev
UCA+f9XQnePvQrfDwpegOLwYk8YyjXa9rLprhk7gAOU4LcdSRT6Udgohsolvrick6CSyUB9gJmkK6Ng1
MjSw4zBQkYMmt7oobkObBQY5XJHcTX5fVGXE5MJsVkQqGqAAKwD6jq4yZcG26WfA9LkwVgj0AwpxjKGV
VeYM/HKK9gzDA9u0/x0y/H4be8rpOYXPyrxXB8++iBL6cFz/Hq+y37uznfmqgAFdTkoW9FsHcGfmxZpJ
PYqrPKKwbt0EuMVGT1Z1F8kgvnwGiAg7/t7oa8RFStF3dsBd5LIYujx0nbnebSrkAFR0qMPzMDF4+Pox
n8KaEm6dtRYGEyYBfJWju+kWqug7aTtrKA=


STR_DECRYPTED: I do not like green eggs and ham I do not like t                y
 them, try them π♥┤k≥¬¿♀┼±;PIINry them and you 2ÜÅ║Bp╟↕┬╟ôM/=»éll not eat them ä
┘7£§σKΦsuQ^m_♦ll not eat them ┴W‼%lt├í┘╒(┐è╝°4ill not eat them≈u♦Z╦▬hR╬▼)♀òε↔┴ n
ot eat them wi▲1╣♠<5á"µi+┌≥τ<æ not eat them he+g═╚╕⌠σû∟í╨♀RV█ñll not eat them ÆΘ
..%♂▓╟Ñnot like them sam i amg]╠£▼n┬☺
Press any key to continue . . .

编辑

这就是我在程序中调用代码的方式，我在 Windows 7 上使用 Visual Studio 2012 的许可版本。

std::string szEncryptionKey= "qwertyuiopasdfghjklzxcvbnmqwerty";;
std::string szEncryptionIV= "0123456789123456";
std::string str="I do not like green eggs and ham I do not like them Sam-I-Am. Try them, try them, and you may! Try them and you may, I say. I will not eat them in a house, i will not eat them with a mouse,i will not eat them in a box i will not eat them with a fox, i will not eat them here of there i will not eat them anywhere, I do not like green eggs and ham i do not like them sam i am";
std::string str_encrypted = encrypt(str, szEncryptionKey, szEncryptionIV);
std::string str_decrypted = decrypt(str_encrypted, szEncryptionKey, szEncryptionIV);

std::cout<< "str encrypted: "<<str_encrypted<<std::endl;
std::cout<< "str decrypted: "<<str_decrypted<<std::endl;
4

2 回答 2

1

供您参考，这对我来说很好：

int main()
{
    std::string key = "qwertyuiopasdfghjklzxcvbnmqwerty";
    std::string IV = "0123456789123456";

    std::string input = "I do not like green eggs and ham I do not like them Sam-I-Am. Try them, try them, and you may! Try them and you may, I say. I will not eat them in a house, i will not eat them with a mouse,i will not eat them in a box i will not eat them with a fox, i will not eat them here of there i will not eat them anywhere, I do not like green eggs and ham i do not like them sam i am";

    //Your encrypt function
    auto encr = encrypt(input, key, IV);
    std::cout << encr << std::endl;  

    //Your decrypt function
    auto decr = decrypt(encr, key, IV);
    std::cout << decr << std::endl;
}

另外，我看到您在new没有关联delete的情况下调用加密和解密函数。我认为这是因为图书馆正在代表您删除对象？

编辑

noloader 确认 Crypto++ 确实负责删除对象。谢谢，noloader！

于 2013-10-02T06:06:13.173 回答
0

我修好了它！我在库中将 AES::BLOCKSIZE 更改为 32，因为我在玩 rijndael。由于 sci.crypt 上的回答指出错误是每 16 个字节（或 AES 的块大小），我现在发现了错误

于 2013-10-02T21:10:21.860 回答