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
命名空间System.Security.Cryptography包含TripleDESCryptoServiceProvider类和RijndaelManaged类
不要忘记添加对系统的引用。安全大会。
其他回答
只是想补充一下,我已经改进了Mud的SimplerAES,通过添加一个随机IV,在加密字符串中传递回。这改进了加密,因为加密同一个字符串每次都会产生不同的输出。
public class StringEncryption
{
private readonly Random random;
private readonly byte[] key;
private readonly RijndaelManaged rm;
private readonly UTF8Encoding encoder;
public StringEncryption()
{
this.random = new Random();
this.rm = new RijndaelManaged();
this.encoder = new UTF8Encoding();
this.key = Convert.FromBase64String("Your+Secret+Static+Encryption+Key+Goes+Here=");
}
public string Encrypt(string unencrypted)
{
var vector = new byte[16];
this.random.NextBytes(vector);
var cryptogram = vector.Concat(this.Encrypt(this.encoder.GetBytes(unencrypted), vector));
return Convert.ToBase64String(cryptogram.ToArray());
}
public string Decrypt(string encrypted)
{
var cryptogram = Convert.FromBase64String(encrypted);
if (cryptogram.Length < 17)
{
throw new ArgumentException("Not a valid encrypted string", "encrypted");
}
var vector = cryptogram.Take(16).ToArray();
var buffer = cryptogram.Skip(16).ToArray();
return this.encoder.GetString(this.Decrypt(buffer, vector));
}
private byte[] Encrypt(byte[] buffer, byte[] vector)
{
var encryptor = this.rm.CreateEncryptor(this.key, vector);
return this.Transform(buffer, encryptor);
}
private byte[] Decrypt(byte[] buffer, byte[] vector)
{
var decryptor = this.rm.CreateDecryptor(this.key, vector);
return this.Transform(buffer, decryptor);
}
private byte[] Transform(byte[] buffer, ICryptoTransform transform)
{
var stream = new MemoryStream();
using (var cs = new CryptoStream(stream, transform, CryptoStreamMode.Write))
{
cs.Write(buffer, 0, buffer.Length);
}
return stream.ToArray();
}
}
奖励单元测试
[Test]
public void EncryptDecrypt()
{
// Arrange
var subject = new StringEncryption();
var originalString = "Testing123!£$";
// Act
var encryptedString1 = subject.Encrypt(originalString);
var encryptedString2 = subject.Encrypt(originalString);
var decryptedString1 = subject.Decrypt(encryptedString1);
var decryptedString2 = subject.Decrypt(encryptedString2);
// Assert
Assert.AreEqual(originalString, decryptedString1, "Decrypted string should match original string");
Assert.AreEqual(originalString, decryptedString2, "Decrypted string should match original string");
Assert.AreNotEqual(originalString, encryptedString1, "Encrypted string should not match original string");
Assert.AreNotEqual(encryptedString1, encryptedString2, "String should never be encrypted the same twice");
}
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。
我改了这个:
public string ByteArrToString(byte[] byteArr)
{
byte val;
string tempStr = "";
for (int i = 0; i <= byteArr.GetUpperBound(0); i++)
{
val = byteArr[i];
if (val < (byte)10)
tempStr += "00" + val.ToString();
else if (val < (byte)100)
tempStr += "0" + val.ToString();
else
tempStr += val.ToString();
}
return tempStr;
}
:
public string ByteArrToString(byte[] byteArr)
{
string temp = "";
foreach (byte b in byteArr)
temp += b.ToString().PadLeft(3, '0');
return temp;
}
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);