c# - rijndael 加密 - 只有部分字符串被解密

Question

只有部分字符串被解密，我认为这与我的编码有关。

这是发生了什么:

        string s = "The brown fox jumped over the green frog";
        string k = "urieurut";
        string enc = EncryptString(s, k);
        string dec = DecryptString(enc, k);

结果是这样的:棕色狐狸juϼ㴘裴혽テ⪻ㆉr th≸ g⟤een frog

public static string EncryptString(string stringToEncrypt, string encryptionKey)
{
    string encrypted = String.Empty;

    UnicodeEncoding UE = new UnicodeEncoding();
    byte[] key = UE.GetBytes(encryptionKey);

    RijndaelManaged RMCrypto = new RijndaelManaged();
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, RMCrypto.CreateEncryptor(key, key), CryptoStreamMode.Write);

    byte[] encryptedString = UE.GetBytes(stringToEncrypt);
    cs.Write(encryptedString, 0, encryptedString.Length);
    cs.FlushFinalBlock();
    cs.Close();

    encrypted = UE.GetString(ms.ToArray());
    return encrypted;
}

public static string DecryptString(string stringToDecrypt, string encryptionKey)
{
    string decrypted = String.Empty;

    UnicodeEncoding UE = new UnicodeEncoding();
    byte[] key = UE.GetBytes(encryptionKey);
    byte[] data = UE.GetBytes(stringToDecrypt);

    RijndaelManaged RMCrypto = new RijndaelManaged();
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, RMCrypto.CreateDecryptor(key, key), CryptoStreamMode.Write);
    cs.Write(data, 0, data.Length);
    cs.FlushFinalBlock();
    cs.Close();

    decrypted = UE.GetString(ms.ToArray());

    return decrypted;
}

Answer 1

给你:

    string s = "The brown fox jumped over the green frog";
    string k = "urieurut";
    byte[] enc = EncryptString(s, k);
    string dec = DecryptString(enc, k);

您不能尝试将一串加密的字节解释为 Unicode 字符串。将它们保存为字节。解密后的版本可以转换回字符串。

另请注意以下一次性元素的处理。如果您没有使用 using() 或 Dispose() 正确释放它们，您可能会导致某些资源持有时间过长或泄漏。

public static byte[] EncryptString(string stringToEncrypt, string encryptionKey)
{
    UnicodeEncoding UE = new UnicodeEncoding();
    byte[] key = UE.GetBytes(encryptionKey);

    using (RijndaelManaged RMCrypto = new RijndaelManaged())
    using (MemoryStream ms = new MemoryStream())
    using (ICryptoTransform encryptor = RMCrypto.CreateEncryptor(key, key))
    using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
    {
        byte[] encryptedString = UE.GetBytes(stringToEncrypt);
        cs.Write(encryptedString, 0, encryptedString.Length);
        cs.FlushFinalBlock();
        return ms.ToArray();
    }
}

public static string DecryptString(byte[] stringToDecrypt, string encryptionKey)
{
    UnicodeEncoding UE = new UnicodeEncoding();
    byte[] key = UE.GetBytes(encryptionKey);

    using (RijndaelManaged RMCrypto = new RijndaelManaged())
    using (MemoryStream ms = new MemoryStream())
    using (ICryptoTransform decryptor = RMCrypto.CreateDecryptor(key, key))
    using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write))
    {
        cs.Write(stringToDecrypt, 0, stringToDecrypt.Length);
        cs.FlushFinalBlock();
        return UE.GetString(ms.ToArray());
    }
}