[英]C# encoding in DES encryption/decryption
我的main方法運行沒有錯誤,但解密的消息不正確。 我幾乎可以肯定我沒有正確編碼,但我無法確定問題。 任何幫助將不勝感激。
這是我的第一篇文章,所以如果我無意中違反了規則或沒有遵守指南,請告訴我。
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;
}
問題是倒數第二行嗎?
string message = Convert.ToBase64String(decryptedMessageBytes);
我可能在這里偏離軌道,但我認為你不打算將字符串字節轉換回base64。 你只需要將字節轉換回字符串嗎?
string message = ASCIIEncoding.ASCII.FromBytes(decryptedMessageBytes);
我使用這個來解決問題
//Encode deencrypted binary data to base64 string
string message = ASCIIEncoding.ASCII.GetString(decryptedMessageBytes);
看起來問題出現在Decrypt中:
// Encode deencrypted binary data to base64 string
string message = Convert.ToBase64String(decryptedMessageBytes);
我認為你不想對解密數據這樣做。 解密的字節已經是ASCII。
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