Question

只有部分字符串被解密，我认为这与我的编码有关。

以下是发生的事情：

        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：棕色的狐狸ϼ裴裴ㆉ≸frog frog frog 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

你走了：

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

您不能尝试将加密的字节串解释为Unicode字符串。将它们保留为字节。解密后的版本可以转换回字符串。

另请注意下面处理一次性物品。如果您没有使用using()或Dispose()正确释放资源，您可能会因某些资源被搁置太久或泄漏而被终结。

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());
    }
}

Answer 2

我通过使用base64字符串进行加密解决了我的问题 - 我可能会看看其他选项，但我只需要这些方法来处理少量数据，这里是最终代码：

public static string EncryptString(string stringToEncrypt, string encryptionKey)
{
    string encrypted = String.Empty;
    byte[] key = Encoding.Unicode.GetBytes(encryptionKey);

    RijndaelManaged RMCrypto = new RijndaelManaged();
    RMCrypto.Padding = PaddingMode.PKCS7;
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, RMCrypto.CreateEncryptor(key, key), CryptoStreamMode.Write);

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

    //encrypted = Encoding.ASCII.GetString(ms.ToArray());
    return Convert.ToBase64String(ms.ToArray());
}

public static string DecryptString(string stringToDecrypt, string encryptionKey)
{
    string decrypted = String.Empty;
    byte[] key = Encoding.Unicode.GetBytes(encryptionKey);
    byte[] data = Convert.FromBase64String(stringToDecrypt);

    RijndaelManaged RMCrypto = new RijndaelManaged();
    RMCrypto.Padding = PaddingMode.PKCS7;
    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 = Encoding.ASCII.GetString(ms.ToArray());

    return decrypted;
}

Answer 3

不确定您的特定代码块，但Jeff Atwood做了一个我以前用过的漂亮的小库：

http://www.codeproject.com/KB/security/SimpleEncryption.aspx

值得一看，因为它简化了很多加密过程，我实际上不得不移植到C＃，因为当我看到它时没有可用的端口。但是现在有一个C＃端口（在评论部分）。

rijndael加密 - 只解密部分字符串

3 个答案: