我的主要方法运行时没有错误,但解密后的消息不正确。我几乎肯定我没有正确编码,但我无法确定这个问题。任何帮助将不胜感激。DES加密/解密中的C#编码
这是我的第一篇文章,所以如果我无意中违反了规则或者不遵守指南,请告诉我。
static void Main(string[] args)
{
string unencryptedString = "cat";
string encryptedString;
string decryptedString;
string password = "password";
System.Console.WriteLine("Unencrypted String: " + unencryptedString);
System.Console.WriteLine("Password: " + password);
encryptedString = StandardEncryptor.Encrypt(unencryptedString, password);
System.Console.WriteLine("Encrypted String: " + encryptedString);
decryptedString = StandardEncryptor.Decrypt(encryptedString, password);
System.Console.WriteLine("Decrypted String: " + decryptedString);
System.Console.ReadLine();
}
public static string Encrypt(string message, string password)
{
// Encode message and password
byte[] messageBytes = ASCIIEncoding.ASCII.GetBytes(message);
byte[] passwordBytes = ASCIIEncoding.ASCII.GetBytes(password);
// Set encryption settings -- Use password for both key and init. vector
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
ICryptoTransform transform = provider.CreateEncryptor(passwordBytes, passwordBytes);
CryptoStreamMode mode = CryptoStreamMode.Write;
// Set up streams and encrypt
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, transform, mode);
cryptoStream.Write(messageBytes, 0, messageBytes.Length);
cryptoStream.FlushFinalBlock();
// Read the encrypted message from the memory stream
byte[] encryptedMessageBytes = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(encryptedMessageBytes, 0, encryptedMessageBytes.Length);
// Encode the encrypted message as base64 string
string encryptedMessage = Convert.ToBase64String(encryptedMessageBytes);
return encryptedMessage;
}
public static string Decrypt(string encryptedMessage, string password)
{
// Convert encrypted message and password to bytes
byte[] encryptedMessageBytes = Convert.FromBase64String(encryptedMessage);
byte[] passwordBytes = ASCIIEncoding.ASCII.GetBytes(password);
// Set encryption settings -- Use password for both key and init. vector
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
ICryptoTransform transform = provider.CreateDecryptor(passwordBytes, passwordBytes);
CryptoStreamMode mode = CryptoStreamMode.Write;
// Set up streams and decrypt
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, transform, mode);
cryptoStream.Write(encryptedMessageBytes, 0, encryptedMessageBytes.Length);
cryptoStream.FlushFinalBlock();
// Read decrypted message from memory stream
byte[] decryptedMessageBytes = new byte[memStream.Length];
memStream.Position = 0;
memStream.Read(decryptedMessageBytes, 0, decryptedMessageBytes.Length);
// Encode deencrypted binary data to base64 string
string message = Convert.ToBase64String(decryptedMessageBytes);
return message;
}
快看看你的代码后,我看不到你所描述的问题,但我建议你不要使用密码初始化向量。每个加密消息的IV必须不同,否则您的加密将容易受到统计分析的影响。可以创建一个随机IV并将其附加(或前置)到密文。 IV并不是秘密,但它必须是一次性的。 – 2010-11-04 20:32:22
此外,DES已损坏。我建议至少3DES,或理想的AES加密块。 AES正式破纪录。 – 2010-11-04 20:37:12
感谢您的建议。 – Dave 2010-11-04 20:48:36