我正在为一些数据寻找非常简单的混淆(比如加密和解密,但不一定安全)功能。这不是关键任务。我需要一些东西来保持诚实的人诚实,但比ROT13或Base64更强大一点。
我更喜欢一些已经包含在. net框架2.0中的东西,这样我就不必担心任何外部依赖。
我真的不想在公钥/私钥等方面浪费时间。我不太懂加密,但我知道我写的任何东西都是没有价值的……事实上,我可能会把数学搞砸,让它变得微不足道。
我正在为一些数据寻找非常简单的混淆(比如加密和解密,但不一定安全)功能。这不是关键任务。我需要一些东西来保持诚实的人诚实,但比ROT13或Base64更强大一点。
我更喜欢一些已经包含在. net框架2.0中的东西,这样我就不必担心任何外部依赖。
我真的不想在公钥/私钥等方面浪费时间。我不太懂加密,但我知道我写的任何东西都是没有价值的……事实上,我可能会把数学搞砸,让它变得微不足道。
当前回答
是,添加系统。安全程序集,导入System.Security.Cryptography名称空间。这是一个简单的对称(DES)算法加密的例子:
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.GenerateKey();
byte[] key = des.Key; // save this!
ICryptoTransform encryptor = des.CreateEncryptor();
// encrypt
byte[] enc = encryptor.TransformFinalBlock(new byte[] { 1, 2, 3, 4 }, 0, 4);
ICryptoTransform decryptor = des.CreateDecryptor();
// decrypt
byte[] originalAgain = decryptor.TransformFinalBlock(enc, 0, enc.Length);
Debug.Assert(originalAgain[0] == 1);
其他回答
是,添加系统。安全程序集,导入System.Security.Cryptography名称空间。这是一个简单的对称(DES)算法加密的例子:
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
des.GenerateKey();
byte[] key = des.Key; // save this!
ICryptoTransform encryptor = des.CreateEncryptor();
// encrypt
byte[] enc = encryptor.TransformFinalBlock(new byte[] { 1, 2, 3, 4 }, 0, 4);
ICryptoTransform decryptor = des.CreateDecryptor();
// decrypt
byte[] originalAgain = decryptor.TransformFinalBlock(enc, 0, enc.Length);
Debug.Assert(originalAgain[0] == 1);
我知道你说过你不关心它有多安全,但如果你选择DES,你也可以选择AES,这是最新的加密方法。
我清理了SimpleAES(上图)供我使用。固定复杂的加密/解密方法;用于编码字节缓冲区、字符串和url友好字符串的分离方法;利用现有的库进行URL编码。
代码更小,更简单,更快,输出更简洁。例如,johnsmith@gmail.com产生:
SimpleAES: "096114178117140150104121138042115022037019164188092040214235183167012211175176167001017163166152"
SimplerAES: "YHKydYyWaHmKKnMWJROkvFwo1uu3pwzTr7CnARGjppg%3d"
代码:
public class SimplerAES
{
private static byte[] key = __Replace_Me__({ 123, 217, 19, 11, 24, 26, 85, 45, 114, 184, 27, 162, 37, 112, 222, 209, 241, 24, 175, 144, 173, 53, 196, 29, 24, 26, 17, 218, 131, 236, 53, 209 });
// a hardcoded IV should not be used for production AES-CBC code
// IVs should be unpredictable per ciphertext
private static byte[] vector = __Replace_Me_({ 146, 64, 191, 111, 23, 3, 113, 119, 231, 121, 221, 112, 79, 32, 114, 156 });
private ICryptoTransform encryptor, decryptor;
private UTF8Encoding encoder;
public SimplerAES()
{
RijndaelManaged rm = new RijndaelManaged();
encryptor = rm.CreateEncryptor(key, vector);
decryptor = rm.CreateDecryptor(key, vector);
encoder = new UTF8Encoding();
}
public string Encrypt(string unencrypted)
{
return Convert.ToBase64String(Encrypt(encoder.GetBytes(unencrypted)));
}
public string Decrypt(string encrypted)
{
return encoder.GetString(Decrypt(Convert.FromBase64String(encrypted)));
}
public byte[] Encrypt(byte[] buffer)
{
return Transform(buffer, encryptor);
}
public byte[] Decrypt(byte[] buffer)
{
return Transform(buffer, decryptor);
}
protected byte[] Transform(byte[] buffer, ICryptoTransform transform)
{
MemoryStream stream = new MemoryStream();
using (CryptoStream cs = new CryptoStream(stream, transform, CryptoStreamMode.Write))
{
cs.Write(buffer, 0, buffer.Length);
}
return stream.ToArray();
}
}
我把我从几个答案和评论中找到的最好的东西结合起来。
加密文本前的随机初始化向量(@jbtule) 使用TransformFinalBlock()代替MemoryStream (@RenniePet) 没有预填充键,以避免任何人复制和粘贴灾难 正确处理和使用模式
代码:
/// <summary>
/// Simple encryption/decryption using a random initialization vector
/// and prepending it to the crypto text.
/// </summary>
/// <remarks>Based on multiple answers in http://stackoverflow.com/questions/165808/simple-two-way-encryption-for-c-sharp </remarks>
public class SimpleAes : IDisposable
{
/// <summary>
/// Initialization vector length in bytes.
/// </summary>
private const int IvBytes = 16;
/// <summary>
/// Must be exactly 16, 24 or 32 bytes long.
/// </summary>
private static readonly byte[] Key = Convert.FromBase64String("FILL ME WITH 24 (2 pad chars), 32 OR 44 (1 pad char) RANDOM CHARS"); // Base64 has a blowup of four-thirds (33%)
private readonly UTF8Encoding _encoder;
private readonly ICryptoTransform _encryptor;
private readonly RijndaelManaged _rijndael;
public SimpleAes()
{
_rijndael = new RijndaelManaged {Key = Key};
_rijndael.GenerateIV();
_encryptor = _rijndael.CreateEncryptor();
_encoder = new UTF8Encoding();
}
public string Decrypt(string encrypted)
{
return _encoder.GetString(Decrypt(Convert.FromBase64String(encrypted)));
}
public void Dispose()
{
_rijndael.Dispose();
_encryptor.Dispose();
}
public string Encrypt(string unencrypted)
{
return Convert.ToBase64String(Encrypt(_encoder.GetBytes(unencrypted)));
}
private byte[] Decrypt(byte[] buffer)
{
// IV is prepended to cryptotext
byte[] iv = buffer.Take(IvBytes).ToArray();
using (ICryptoTransform decryptor = _rijndael.CreateDecryptor(_rijndael.Key, iv))
{
return decryptor.TransformFinalBlock(buffer, IvBytes, buffer.Length - IvBytes);
}
}
private byte[] Encrypt(byte[] buffer)
{
// Prepend cryptotext with IV
byte [] inputBuffer = _encryptor.TransformFinalBlock(buffer, 0, buffer.Length);
return _rijndael.IV.Concat(inputBuffer).ToArray();
}
}
更新2015-07-18:修复了@bpsilver和@Evereq注释中private Encrypt()方法的错误。IV被意外加密,现在以明文形式被Decrypt()前置。
马克斯(优秀)答案的变体
添加“使用” 将类设置为IDisposable 删除URL编码代码以简化示例。 添加一个简单的测试装置来演示使用方法
希望这能有所帮助
[TestFixture]
public class RijndaelHelperTests
{
[Test]
public void UseCase()
{
//These two values should not be hard coded in your code.
byte[] key = {251, 9, 67, 117, 237, 158, 138, 150, 255, 97, 103, 128, 183, 65, 76, 161, 7, 79, 244, 225, 146, 180, 51, 123, 118, 167, 45, 10, 184, 181, 202, 190};
byte[] vector = {214, 11, 221, 108, 210, 71, 14, 15, 151, 57, 241, 174, 177, 142, 115, 137};
using (var rijndaelHelper = new RijndaelHelper(key, vector))
{
var encrypt = rijndaelHelper.Encrypt("StringToEncrypt");
var decrypt = rijndaelHelper.Decrypt(encrypt);
Assert.AreEqual("StringToEncrypt", decrypt);
}
}
}
public class RijndaelHelper : IDisposable
{
Rijndael rijndael;
UTF8Encoding encoding;
public RijndaelHelper(byte[] key, byte[] vector)
{
encoding = new UTF8Encoding();
rijndael = Rijndael.Create();
rijndael.Key = key;
rijndael.IV = vector;
}
public byte[] Encrypt(string valueToEncrypt)
{
var bytes = encoding.GetBytes(valueToEncrypt);
using (var encryptor = rijndael.CreateEncryptor())
using (var stream = new MemoryStream())
using (var crypto = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
{
crypto.Write(bytes, 0, bytes.Length);
crypto.FlushFinalBlock();
stream.Position = 0;
var encrypted = new byte[stream.Length];
stream.Read(encrypted, 0, encrypted.Length);
return encrypted;
}
}
public string Decrypt(byte[] encryptedValue)
{
using (var decryptor = rijndael.CreateDecryptor())
using (var stream = new MemoryStream())
using (var crypto = new CryptoStream(stream, decryptor, CryptoStreamMode.Write))
{
crypto.Write(encryptedValue, 0, encryptedValue.Length);
crypto.FlushFinalBlock();
stream.Position = 0;
var decryptedBytes = new Byte[stream.Length];
stream.Read(decryptedBytes, 0, decryptedBytes.Length);
return encoding.GetString(decryptedBytes);
}
}
public void Dispose()
{
if (rijndael != null)
{
rijndael.Dispose();
}
}
}