Question

首先，我知道这个问题可以在这里找到很多-但它们不是我想要的。

我试图在PHP脚本上加密数据，然后稍后在C＃应用程序上对其解密

我当前的PHP代码：

$plaintext = 'My secret message 1234';
$password = '3sc3RLrpd17';
$method = 'aes-256-cbc';

$key = password_hash($password, PASSWORD_BCRYPT, ['cost' => 12]);

// IV must be exact 16 chars (128 bit)
$iv = chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0) . chr(0x0);

// av3DYGLkwBsErphcyYp+imUW4QKs19hUnFyyYcXwURU=
$encrypted = base64_encode(openssl_encrypt($plaintext, $method, $key, OPENSSL_RAW_DATA, $iv));

echo $encrypted;

之后，我想在我的C＃应用程序上解密$encrypted的值...

我目前正在这样做：

public string DecryptString(string cipherText, byte[] key, byte[] iv)
{
    // Instantiate a new Aes object to perform string symmetric encryption
    Aes encryptor = Aes.Create();

    encryptor.Mode = CipherMode.CBC;
    //encryptor.KeySize = 256;
    //encryptor.BlockSize = 128;
    //encryptor.Padding = PaddingMode.Zeros;

    // Set key and IV
    encryptor.Key = key.Take(32).ToArray();
    encryptor.IV = iv;

    // Instantiate a new MemoryStream object to contain the encrypted bytes
    MemoryStream memoryStream = new MemoryStream();

    // Instantiate a new encryptor from our Aes object
    ICryptoTransform aesDecryptor = encryptor.CreateDecryptor();

    // Instantiate a new CryptoStream object to process the data and write it to the 
    // memory stream
    CryptoStream cryptoStream = new CryptoStream(memoryStream, aesDecryptor, CryptoStreamMode.Write);

    // Will contain decrypted plaintext
    string plainText = String.Empty;

    try
    {
        // Convert the ciphertext string into a byte array
        byte[] cipherBytes = Convert.FromBase64String(cipherText);

        // Decrypt the input ciphertext string
        cryptoStream.Write(cipherBytes, 0, cipherBytes.Length);

        // Complete the decryption process
        cryptoStream.FlushFinalBlock();

        // Convert the decrypted data from a MemoryStream to a byte array
        byte[] plainBytes = memoryStream.ToArray();

        // Convert the decrypted byte array to string
        plainText = Encoding.ASCII.GetString(plainBytes, 0, plainBytes.Length);
    }
    finally
    {
        // Close both the MemoryStream and the CryptoStream
        memoryStream.Close();
        cryptoStream.Close();
    }

    // Return the decrypted data as a string
    return plainText;
}

string password = "3sc3RLrpd17";

// hash the password with BCrypt
string hashedPassword = BCrypt.Net.BCrypt.HashPassword(password, 12);

// Convert hashed password to array
byte[] key = Encoding.ASCII.GetBytes(hashedPassword);

// Create secret IV
byte[] iv = new byte[16] { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 };

string decrypted = this.DecryptString(encrypted, key, iv);

但是最后，decrypted的值不是My secret message 1234

我得到的错误是：Padding is invalid and cannot be removed.

免责声明：我已安装BCrypt软件包。

我认为问题出在iv。

我已经做了很多修复。

任何帮助将不胜感激。

谢谢！

Answer 1

尝试在EncryptString 和 DecryptString函数中更改以下代码：

旧

encryptor.Key = key.Take(32).ToArray();

新

byte[] aesKey = new byte[32];
Array.Copy(key, 0, aesKey, 0, 32);
encryptor.Key = aesKey;

PS：您的错误消息表示AES密钥不正确。确保您使用相同的密钥和iv进行加密和解密。

在C＃应用程序中解密从PHP脚本返回的AES

1 个答案:

旧

新