如何连续加密和解密多个值

Question

在我的程序中，我使用 crypto++ 库。我有这样的结构：

struct crypt_struct{
  //consists of encrypted data
  string name1;
  string name2;
  string name3;
}
struct decrypt_struct{
  //consists of decrypted data
  int name1;
  string name2;
  double name3;
}

我有加密功能：

crypt_struct encrypt(decrypt_struct struct_in) {
    //Key and IV setup
    //AES encryption uses a secret key of a variable length (128-bit, 196-bit or 256-   
    //bit). This key is secretly exchanged between two parties before communication   
    //begins. DEFAULT_KEYLENGTH= 16 bytes
    byte key[CryptoPP::AES::DEFAULT_KEYLENGTH], iv[CryptoPP::AES::BLOCKSIZE];
    memset(key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH);
    memset(iv, 0x00, CryptoPP::AES::BLOCKSIZE);
    //output encrypt struct
    crypt_struct struct_out;

    //encrypt text
    string ciphertext;

    CryptoPP::AES::Encryption aesEncryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH);
    CryptoPP::CBC_Mode_ExternalCipher::Encryption cbcEncryption(aesEncryption, iv);
    CryptoPP::StreamTransformationFilter stfEncryptor(cbcEncryption, new CryptoPP::StringSink(ciphertext));


    //int name1
    stfEncryptor.Put(reinterpret_cast<const unsigned char*> ((to_string(struct_in.name1)).c_str()), (to_string(struct_in.name1)).length() + 1);
    stfEncryptor.MessageEnd();
    struct_out.name1 = ciphertext;
    cout << ciphertext << endl;
    ciphertext.clear();

    //string name2
    stfEncryptor.Put(reinterpret_cast<const unsigned char*> (struct_in.name2.c_str()), struct_in.name2.length() + 1);
    stfEncryptor.MessageEnd();
    struct_out.name2 = ciphertext;
    cout << ciphertext << endl;
    ciphertext.clear();

    //double name3
    stfEncryptor.Put(reinterpret_cast<const unsigned char*> ((to_string(struct_in.name3)).c_str()), (to_string(struct_in.name3)).length() + 1);
    stfEncryptor.MessageEnd();
    struct_out.name3 = ciphertext;
    cout << ciphertext << endl;
    ciphertext.clear();

    return struct_out;
}

和解密函数：

decrypt_struct decrypt(crypt_struct struct_in)
{
    //Key and IV setup
    //AES encryption uses a secret key of a variable length (128-bit, 196-bit or 256-   
    //bit). This key is secretly exchanged between two parties before communication   
    //begins. DEFAULT_KEYLENGTH= 16 bytes

    byte key[CryptoPP::AES::DEFAULT_KEYLENGTH], iv[CryptoPP::AES::BLOCKSIZE];
    memset(key, 0x00, CryptoPP::AES::DEFAULT_KEYLENGTH);
    memset(iv, 0x00, CryptoPP::AES::BLOCKSIZE);
    //
    // Decrypt
    //
    decrypt_struct struct_out;
    string decryptedtext;
    CryptoPP::AES::Decryption aesDecryption(key, CryptoPP::AES::DEFAULT_KEYLENGTH);
    CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption, iv);
    CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption, new CryptoPP::StringSink(decryptedtext));

    stfDecryptor.Put(reinterpret_cast<const unsigned char*>(struct_in.name1.c_str()), struct_in.name1.length());
    struct_out.name1= atoi(decryptedtext.c_str());
    stfDecryptor.MessageEnd();
    decryptedtext.clear();

    stfDecryptor.Put(reinterpret_cast<const unsigned char*>(struct_in.name2.c_str()), struct_in.name2.length());
    struct_out.name2= atoi(decryptedtext.c_str());
    stfDecryptor.MessageEnd();
    decryptedtext.clear();

    stfDecryptor.Put(reinterpret_cast<const unsigned char*>(struct_in.name3.c_str()), struct_in.name3.length());
    struct_out.name3= atoi(decryptedtext.c_str());
    stfDecryptor.MessageEnd();
    decryptedtext.clear();

    return struct_out;

}

如果我尝试只加密一个变量，那么所有内容都会被正确解密。但是如果我尝试同时加密多个变量，则会发生错误。而且，在对变量int类型进行加密时，也会出现同样的错误。可以连接什么，有没有人知道？

我觉得可能是这个函数一次只能加密一行。

Answer 1

问题是这样的：问题是在这个库的源代码中，解密时使用了 c_str() 函数。那些：

stfDecryptor.Put(reinterpret_cast<const unsigned char*> (struct_in.name1.c_str()), struct_in.name1.size());

官方文档说：

The pointer obtained from c_str() may only be treated as a pointer to a null-terminated character string if the string object does not contain other null characters.

在加密函数中，一个零字符被添加到字符串中，当我们尝试解密时，通过 c_str() 函数，我们 trim 我们的字符串具有第一个零字符。

但是，在 с++ 11 的标准中，添加了一个类似的函数，它执行与 data() 函数相同的操作，只是它不考虑空字符。

结果，我收到了：

stfDecryptor.Put(reinterpret_cast<const unsigned char*> (struct_in.name1.data()), struct_in.name1.size());

此外，重要的是，如果您先加密 name1，然后 name2，然后 name3。那和解密你应该以相同的顺序。

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