Problems with CryptoPP C++ AES-256+Base64

Problems with CryptoPP C++ AES-256+Base64

本文关键字：AES-256+Base64 C++ CryptoPP with Problems      更新时间：2023-10-16

有人可以告诉我为什么解密开始搞砸吗？它适用于短字符串，但正如您所看到的那样，它会搞砸。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liscensed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;

供您参考，这对我来说效果很好：

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，我看到您在加密和解密函数中调用new时没有关联的delete。我认为这是因为库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，无负载器！

我修好了！我在库中将 AES：：BLOCKSIZE 更改为 32，因为我正在玩 rijndael。由于sci.crypt上的一个答案，我现在已经找到了错误，该答案指出错误是每16个字节（或AES的块大小）

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