[英]de-/encrypt a string (not a file) the easiest way with one function both ways possible, how?
我想在我的程序中加密一個簡短的文本框或字符串(而不是文件)來呈現其人類不可讀的內容,或者使用簡單加密來加密它是安全的(如任何敏感密碼等)。 在Visual Basic中很容易做到這五行,當我在那里復制它時,它在我的C#中不起作用。 我找不到合適的東西。 只有非常困難的例子需要大量的代碼,這些代碼主要會拋出很多錯誤,並且需要自己設置任何復雜的密鑰或密鑰對或哈希,utf編碼或兩者以使其工作而且它永遠不會。 我不知道所有這些,我只需要一個簡單的功能,它可以兼顧加密的兩種方式。 無法為C#找到類似的東西,它確實可以正常工作,並且可以向前和向后工作。 在VB中加密了C#中不存在的XOR函數。
或者我將如何獲得下面的代碼示例,它是最有希望的:如果我在button1_click事件中將其復制到C#中,它會給我帶來很多錯誤:
錯誤1:類型或名稱空間定義或預期的結束文件
錯誤2:找不到類型或命名空間“TripleDESCryptoServiceProvider”
錯誤3:當前上下文中不存在“CipherMode”
錯誤4:當前上下文中不存在“Getkey”
錯誤5:當前上下文中不存在“PaddingMode”錯誤6:錯誤8找不到類型或命名空間名稱“ICryptoTransform”(您是否缺少using指令或essemble引用?)
public static string Encrypt(string data)
{
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB;
DES.Key = GetKey("a1!B78s!5(");
DES.Padding = PaddingMode.PKCS7;
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
Byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(data);
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
}
public static string Decrypt(string data)
{
TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
DES.Mode = CipherMode.ECB;
DES.Key = GetKey("a1!B78s!5(");
DES.Padding = PaddingMode.PKCS7;
ICryptoTransform DESEncrypt = DES.CreateDecryptor();
Byte[] Buffer = Convert.FromBase64String(data.Replace(" ","+"));
return Encoding.UTF8.GetString(DESEncrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));
}
如果您真正想要做的就是屏蔽文本輸入框的內容..在Windows窗體中,使用TextBox控件並將PasswordChar屬性設置為字符。 在WPF中,使用PasswordBox並可選擇將PasswordChar屬性設置為字符。
如果你真的需要加密,不要尋找快捷方式(自己實現,硬編碼密碼或密鑰),因為你最終會看到一些看起來很安全的東西,但是真的可以在幾分鍾內被知道自己在做什么的人攻擊。
在這里,您的方法現在將如下工作:
public static string Encrypt(string data)
{
using (var des = new TripleDESCryptoServiceProvider { Mode = CipherMode.ECB, Key = GetKey("a1!B78s!5(j$S1c%"), Padding = PaddingMode.PKCS7 })
using (var desEncrypt = des.CreateEncryptor())
{
var buffer = Encoding.UTF8.GetBytes(data);
return Convert.ToBase64String(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));
}
}
public static string Decrypt(string data)
{
using (var des = new TripleDESCryptoServiceProvider { Mode = CipherMode.ECB, Key = GetKey("a1!B78s!5(j$S1c%"), Padding = PaddingMode.PKCS7 })
using (var desEncrypt = des.CreateDecryptor())
{
var buffer = Convert.FromBase64String(data.Replace(" ", "+"));
return Encoding.UTF8.GetString(desEncrypt.TransformFinalBlock(buffer, 0, buffer.Length));
}
}
問題是A)密鑰長度無效(我猜是由於缺少GetKey()
定義 - 但是每個字符16個字符乘以8位是Triple DES的最小128位)和B)獲取源字符串的字節為ASCII用於加密,但在解密后,使用UTF8編碼。
除了我在鏈接問題中的答案,你可以做類似的事情,
public static string Obfuscate(string before)
{
var beforeArray = Encoding.Unicode.GetBytes(before);
var count = beforeArray.Length;
var resultArray = new byte[count];
var o = count % 32;
for (var i = 0; i < count; i++)
{
var xor = o + 32;
resultArray[i] = (byte)(beforeArray[i] ^ xor);
o = ++o % 32;
}
return Encoding.Unicode.GetString(resultArray)
}
它是字符串中字節的一個微不足道的XOR。 它不是加密,但它使字符串很難讓人閱讀。
如果你真的想要強加密,你必須從避開TDES開始。
補充了Jesse C. Slicer接受的答案,這里是“GetKey”代碼,我在這里找到了它
private static byte[] GetKey(string password)
{
string pwd = null;
if (Encoding.UTF8.GetByteCount(password) < 24)
{
pwd = password.PadRight(24, ' ');
}
else
{
pwd = password.Substring(0, 24);
}
return Encoding.UTF8.GetBytes(pwd);
}
更好的是......使用AES而不是3DES。 有關為什么你可以在另一個SO答案中看到這里的解釋。
以下是我使用的一些加密/解密方法。 輸入和輸出是base64Strings。
static string EncryptStringToBase64String(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// return encrypted bytes converted to Base64String
return Convert.ToBase64String(encrypted);
}
static string DecryptStringFromBase64String(string cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(Convert.FromBase64String(cipherText)))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
這是一些測試代碼,因為我看到你在加密/解密中創建你的Key / IV。
var inputString = "SomeText";
var r = RijndaelManaged.Create();
r.GenerateKey();
r.GenerateIV();
var key = r.Key;
var iv = r.IV;
var a = EncryptStringToBase64String(inputString, key, iv);
var b = DecryptStringFromBase64String(a, key, iv);
Assert.AreEqual(b, inputString);
Assert.AreNotEqual(a, inputString);
使用System.Security.Cryptography; ;
public class StringCipher
{
private const int keysize = 256;
public static string Encrypt(string plainText)
{
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
using (PasswordDeriveBytes password = new PasswordDeriveBytes("123", null))
{
byte[] keyBytes = password.GetBytes(keysize / 8);
using (RijndaelManaged symmetricKey = new RijndaelManaged())
{
symmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
byte[] cipherTextBytes = memoryStream.ToArray();
return Convert.ToBase64String(cipherTextBytes);
}
}
}
}
}
}
public static string Decrypt(string cipherText)
{
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
using (PasswordDeriveBytes password = new PasswordDeriveBytes("123", null))
{
byte[] keyBytes = password.GetBytes(keysize / 8);
using (RijndaelManaged symmetricKey = new RijndaelManaged())
{
symmetricKey.Mode = CipherMode.CBC;
using (ICryptoTransform decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes))
{
using (MemoryStream memoryStream = new MemoryStream(cipherTextBytes))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
return Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);
}
}
}
}
}
}
}
}
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