UE4 CryptoPP 5.6.5 加解密

 

Crypto++ 5.6.5
 

密码与偏移量：

 

 

static SecByteBlock GetKey(std::string KeyStr)
    {
        SecByteBlock key(AES::MAX_KEYLENGTH);
        memset(key, 0x30, key.size());
        KeyStr.size() <= AES::MAX_KEYLENGTH ? memcpy(key, KeyStr.c_str(), KeyStr.size()) : memcpy(key, KeyStr.c_str(), AES::MAX_KEYLENGTH);
        return key;
    }
    //convert string to byte
    static SecByteBlock GetIV(std::string KeyStr, const std::string IVStr)
    {
        SecByteBlock IV(AES::BLOCKSIZE);
        memset(IV, 0x30, IV.size());
        KeyStr.size() <= AES::BLOCKSIZE ? memcpy(IV, IVStr.c_str(), IVStr.size()) : memcpy(IV, IVStr.c_str(), AES::BLOCKSIZE);
        return IV;
    }

 

 

加解密过程（包含输出 string 及 file）：

 

UFUNCTION(BlueprintCallable, Category = "AES")
    static void CBC_StringEncrypto(const FString aes_content, FString& aes_encrypt_content, const FString aes_key = TEXT("1234567890123456"), const FString aes_IV = TEXT("ahbdgteyusnjkldu"))
    {
        const std::string plaintext = TCHAR_TO_UTF8(*aes_content);
        // Initialise the key and IV
        SecByteBlock key = GetKey(TCHAR_TO_UTF8(*aes_key));
        SecByteBlock iv = GetIV(TCHAR_TO_UTF8(*aes_key), TCHAR_TO_UTF8(*aes_IV));

        // Encrypt
        AES::Encryption cipher(key, AES::MAX_KEYLENGTH);
        CBC_Mode_ExternalCipher::Encryption encryption(cipher, iv);
        std::string cipher_text;
        StreamTransformationFilter filter(encryption, new StringSink(cipher_text));
        //使用填充并通过 HexEncoder 编码将 cipher_text 密文转成可以正常打印阅读的密文，但是无法正常解码？？？？？？？？？？
        //StreamTransformationFilter filter(encryption, new HexEncoder(new StringSink(cipher_text)), BlockPaddingSchemeDef::BlockPaddingScheme::ZEROS_PADDING);
        filter.Put(reinterpret_cast<const byte*>(plaintext.c_str()), plaintext.size());
        filter.MessageEnd();

        //存输出的 string 密文
        std::string cipherOut;
        StringSource(cipher_text, true, new HexEncoder(new StringSink(cipherOut)));
        //to lower
        //std::string str = _strlwr(TCHAR_TO_ANSI((UTF8_TO_TCHAR(cipher_text.c_str()))));
        aes_encrypt_content = cipherOut.c_str();
    }

    UFUNCTION(BlueprintCallable, Category = "AES")
    static void CBC_StringDecrypto(const FString aes_encrypt_content, FString& aes_content, const FString aes_key = TEXT("1234567890123456"), const FString aes_IV = TEXT("ahbdgteyusnjkldu"))
    {
        //存明文
        std::string cipher_text;
        //对密文先进行 Decoder 为明文
        StringSource(TCHAR_TO_UTF8(*aes_encrypt_content), true, new HexDecoder(new StringSink(cipher_text)));

        //存输出的 string 明文
        std::string decrypted_text;
        
        //Initialise the key and IV
        SecByteBlock key = GetKey(TCHAR_TO_UTF8(*aes_key));
        SecByteBlock iv = GetIV(TCHAR_TO_UTF8(*aes_key), TCHAR_TO_UTF8(*aes_IV));

        // Decrypt
        AES::Decryption cipher(key, AES::MAX_KEYLENGTH);
        CBC_Mode_ExternalCipher::Decryption decryption(cipher, iv);
        
        StreamTransformationFilter filter(decryption, new StringSink(decrypted_text));
        //使用填充并通过 HexEncoder 编码将 cipher_text 密文转成可以正常阅读的明文，无法正常解码使用？？？？？？？？？？
        //StreamTransformationFilter filter(decryption, new HexEncoder(new StringSink(decrypted_text)), BlockPaddingSchemeDef::BlockPaddingScheme::ZEROS_PADDING);
        filter.Put(reinterpret_cast<const byte*>(cipher_text.c_str()), cipher_text.size());
        filter.MessageEnd();

        aes_content = UTF8_TO_TCHAR(decrypted_text.c_str());
    }

UFUNCTION(BlueprintCallable, Category = "AES")
    static void CBC_AESFileEncrypto(const FString aes_key = TEXT("1234567890123456"), const FString aes_IV = TEXT("ahbdgteyusnjkldu"))
    {
        FString OriginalPath = FPaths::ProjectContentDir() + "\\" + TEXT("original.txt");
        const std::string original_file = TCHAR_TO_UTF8(*OriginalPath);
        FString EncryptPath = FPaths::ProjectContentDir() + "\\" + TEXT("encrypted.txt");
        const std::string encrypto_file = TCHAR_TO_UTF8(*EncryptPath);


        // Initialise the key and IV
        SecByteBlock key = GetKey(TCHAR_TO_UTF8(*aes_key));
        SecByteBlock iv = GetIV(TCHAR_TO_UTF8(*aes_key), TCHAR_TO_UTF8(*aes_IV));
        

        // Read the file contents to a string and output to cout.  Safest to read
        // contents as binary data, although non-printable characters shouldn't be
        // output to cout.
        std::ifstream infile(original_file.c_str(), std::ios::binary);
        const std::string plaintext((std::istreambuf_iterator<char>(infile)), std::istreambuf_iterator<char>());
        infile.close();
        std::cout << "Plain Text (" << plaintext.size() << " bytes)\n" << plaintext << "\n\n";

        // Encrypt
        AES::Encryption cipher(key, AES::MAX_KEYLENGTH);
        CBC_Mode_ExternalCipher::Encryption encryption(cipher, iv);
        std::string cipher_text;
        StreamTransformationFilter filter(encryption, new StringSink(cipher_text));
        //使用填充并通过 HexEncoder 编码将 cipher_text 密文转成可以正常打印阅读的密文，但是无法正常解码？？？？？？？？？？
        //StreamTransformationFilter filter(encryption, new HexEncoder(new StringSink(cipher_text)), BlockPaddingSchemeDef::BlockPaddingScheme::PKCS_PADDING, true);
        filter.Put(reinterpret_cast<const byte*>(plaintext.c_str()), plaintext.size());
        filter.MessageEnd();

        //to lower
        //std::string str = _strlwr(TCHAR_TO_ANSI((UTF8_TO_TCHAR(cipher_text.c_str()))));

        // Dump cipher text
        std::ofstream outfile(encrypto_file.c_str(), std::ios::binary);
        outfile.write(cipher_text.c_str(), cipher_text.size());
        outfile.close();
    }

    UFUNCTION(BlueprintCallable, Category = "AES")
    static void CBC_AESFileDecrypto(const FString aes_key = TEXT("1234567890123456"), const FString aes_IV = TEXT("ahbdgteyusnjkldu"))
    {
        FString EncryptPath = FPaths::ProjectContentDir() + "\\" + TEXT("encrypted.txt");
        const std::string encrypto_file = TCHAR_TO_UTF8(*EncryptPath);
        FString DecryptoPath = FPaths::ProjectContentDir() + "\\" + TEXT("decrypted.txt");
        const std::string decrypto_file = TCHAR_TO_UTF8(*DecryptoPath);


        //Initialise the key and IV
        SecByteBlock key = GetKey(TCHAR_TO_UTF8(*aes_key));
        SecByteBlock iv = GetIV(TCHAR_TO_UTF8(*aes_key), TCHAR_TO_UTF8(*aes_IV));

        // Read the encrypted file contents to a string as binary data.
        std::ifstream infile(encrypto_file.c_str(), std::ios::binary);
        const std::string cipher_text((std::istreambuf_iterator<char>(infile)), std::istreambuf_iterator<char>());
        infile.close();

        // Decrypt
        CryptoPP::AES::Decryption cipher(key, AES::MAX_KEYLENGTH);
        CryptoPP::CBC_Mode_ExternalCipher::Decryption decryption(cipher, iv);
        std::string decrypted_test;
        StreamTransformationFilter filter(decryption, new CryptoPP::StringSink(decrypted_test));
        //使用填充并通过 HexEncoder 编码将 cipher_text 密文转成可以正常阅读的明文，无法正常解码使用？？？？？？？？？？
        //StreamTransformationFilter filter(decryption, new HexEncoder(new StringSink(decrypted_test)), BlockPaddingSchemeDef::BlockPaddingScheme::PKCS_PADDING, true);
        filter.Put(reinterpret_cast<const byte*>(cipher_text.c_str()), cipher_text.size());
        filter.MessageEnd();

        // Dump decrypted text
        std::ofstream outfile(decrypto_file.c_str(), std::ios::binary);
        outfile.write(decrypted_test.c_str(), decrypted_test.size());
        outfile.close();
    }

 
Encrypto 及 Decrypto 都支持 DEFAULT_PADDING、NO_PADDING、ONE_AND_ZEROS_PADDING、PKCS_PADDING、ZEROS_PADDING，不设置 PADDING 参数（源码默认是 DEFAULT_PADDING）。

 

WEB AES 验证工具：

https://www.ssleye.com/ssltool/aes_cipher.html

https://www.javainuse.com/aesgenerator

https://the-x.cn/en-us/cryptography/Aes.aspx

 

 

相关话题：

http://elmagnifico.tech/2021/01/08/Crypto++-padding/

https://gameinstitute.qq.com/community/detail/121437

https://en.wikipedia.org/wiki/Advanced_Encryption_Standard

https://www.codenong.com/43967330/

https://coderedirect.com/questions/212416/encrypt-decrypt-with-aes-using-c-c

https://stackoverflow.com/questions/43967330/crypto-aes-256-ecb-result-is-different-with-openssl

https://blog.csdn.net/qq_35649764/article/details/83036230?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0.highlightwordscore&spm=1001.2101.3001.4242.1

https://blog.csdn.net/suhiymof/article/details/92796811