我需要在C#中实现字符串的简单编码和解码。
我不需要“高机密”加密,所以只要得到校验和就可以很简单的编码。
我需要在一个代码实例中轻松进行双向编码解码。只有一个程序可以进行编码和解码,因此任何“密钥”都可以进行硬编码。
编码结果应为字母数字(文本)。应避免使用二进制数据(非数据,非数字),因为字段将参与文本CSV表的文件。
我需要获得一个可以检查一致性的代码(因此它应该包括控制数字/校验和),因此我可以告诉该字段由第三方保持不变并且可以有效地解码。 (像信用卡号码内的控制数字一样)。
代码长度应与原始字符串的长度大致相似(不是5-10倍)。
如果您指出我在C#内最好的图书馆,我感谢您,提前感谢!
答案 0 :(得分:4)
RC4是一种简单的算法,可以轻松实现加密/解密。它不如AES安全,但似乎在您的情况下您不需要AES安全性。以下是来自this site
的.NET中RC4的实现public static class RC4
{
public static string Encrypt(string key, string data)
{
Encoding unicode = Encoding.Unicode;
return Convert.ToBase64String(Encrypt(unicode.GetBytes(key), unicode.GetBytes(data)));
}
public static string Decrypt(string key, string data)
{
Encoding unicode = Encoding.Unicode;
return unicode.GetString(Encrypt(unicode.GetBytes(key), Convert.FromBase64String(data)));
}
public static byte[] Encrypt(byte[] key, byte[] data)
{
return EncryptOutput(key, data).ToArray();
}
public static byte[] Decrypt(byte[] key, byte[] data)
{
return EncryptOutput(key, data).ToArray();
}
private static byte[] EncryptInitalize(byte[] key)
{
byte[] s = Enumerable.Range(0, 256)
.Select(i => (byte)i)
.ToArray();
for (int i = 0, j = 0; i < 256; i++)
{
j = (j + key[i % key.Length] + s[i]) & 255;
Swap(s, i, j);
}
return s;
}
private static IEnumerable<byte> EncryptOutput(byte[] key, IEnumerable<byte> data)
{
byte[] s = EncryptInitalize(key);
int i = 0;
int j = 0;
return data.Select((b) =>
{
i = (i + 1) & 255;
j = (j + s[i]) & 255;
Swap(s, i, j);
return (byte)(b ^ s[(s[i] + s[j]) & 255]);
});
}
private static void Swap(byte[] s, int i, int j)
{
byte c = s[i];
s[i] = s[j];
s[j] = c;
}
}
答案 1 :(得分:1)
我已经使用此代码与rijndael进行加密/解密。当触摸加密字符串时,它会抛出CryptographicException。
来自http://www.codeproject.com/Articles/5719/Simple-encrypting-and-decrypting-data-in-C
的方法public string Encrypt(string clearText, string Password)
{
//Convert text to bytes
byte[] clearBytes =
System.Text.Encoding.Unicode.GetBytes(clearText);
//We will derieve our Key and Vectore based on following
//password and a random salt value, 13 bytes in size.
PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password,
new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d,
0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
byte[] encryptedData = Encrypt(clearBytes,
pdb.GetBytes(32), pdb.GetBytes(16));
return Convert.ToBase64String(encryptedData);
}
//Call following function to decrypt data
public string Decrypt(string cipherText, string Password)
{
//Convert base 64 text to bytes
byte[] cipherBytes = Convert.FromBase64String(cipherText);
//We will derieve our Key and Vectore based on following
//password and a random salt value, 13 bytes in size.
PasswordDeriveBytes pdb = new PasswordDeriveBytes(Password,
new byte[] {0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65,
0x64, 0x76, 0x65, 0x64, 0x65, 0x76});
byte[] decryptedData = Decrypt(cipherBytes,
pdb.GetBytes(32), pdb.GetBytes(16));
//Converting unicode string from decrypted data
return Encoding.Unicode.GetString(decryptedData);
}
public byte[] Encrypt(byte[] clearData, byte[] Key, byte[] IV)
{
byte[] encryptedData;
//Create stream for encryption
using (MemoryStream ms = new MemoryStream())
{
//Create Rijndael object with key and vector
using (Rijndael alg = Rijndael.Create())
{
alg.Key = Key;
alg.IV = IV;
//Forming cryptostream to link with data stream.
using (CryptoStream cs = new CryptoStream(ms,
alg.CreateEncryptor(), CryptoStreamMode.Write))
{
//Write all data to stream.
cs.Write(clearData, 0, clearData.Length);
}
encryptedData = ms.ToArray();
}
}
return encryptedData;
}
public byte[] Decrypt(byte[] cipherData, byte[] Key, byte[] IV)
{
byte[] decryptedData;
//Create stream for decryption
using (MemoryStream ms = new MemoryStream())
{
//Create Rijndael object with key and vector
using (Rijndael alg = Rijndael.Create())
{
alg.Key = Key;
alg.IV = IV;
//Forming cryptostream to link with data stream.
using (CryptoStream cs = new CryptoStream(ms,
alg.CreateDecryptor(), CryptoStreamMode.Write))
{
//Write all data to stream.
cs.Write(cipherData, 0, cipherData.Length);
}
decryptedData = ms.ToArray();
}
}
return decryptedData;
}