我在我的应用程序中使用DES-ECB + base64加密。这就是我称之为“Crypto”的类的代码
public class Crypto
{
public static string Decrypt(string encryptedString)
{
DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
desProvider.Mode = CipherMode.ECB;
desProvider.Padding = PaddingMode.PKCS7;
desProvider.Key = Encoding.ASCII.GetBytes("e5d66cf8");
using (MemoryStream stream = new MemoryStream(Convert.FromBase64String(encryptedString)))
{
using (CryptoStream cs = new CryptoStream(stream, desProvider.CreateDecryptor(), CryptoStreamMode.Read))
{
using (StreamReader sr = new StreamReader(cs, Encoding.ASCII))
{
return sr.ReadToEnd();
}
}
}
}
public static string Encrypt(string decryptedString)
{
DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
desProvider.Mode = CipherMode.ECB;
desProvider.Padding = PaddingMode.PKCS7;
desProvider.Key = Encoding.ASCII.GetBytes("e5d66cf8");
using (MemoryStream stream = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(stream, desProvider.CreateEncryptor(), CryptoStreamMode.Write))
{
byte[] data = Encoding.Default.GetBytes(decryptedString);
cs.Write(data, 0, data.Length);
return Convert.ToBase64String(stream.ToArray());
}
}
}
}
但是当我加密一个字符串,然后再次解密并再加密一次时,加密的字符串与之前加密的字符串不同。这是第一个加密字符串:
kEN0HUp / dqz8kXA7nYivJG6Jl3haLJjhBq1UfEtQTwaPwizW // 03M0UxF8dBuYZo2BoZ5vsVcXRJF1LpFZLWxDsdeKAC43L2K2OoYRxTn / dA6KmM13YS9xOezGiROQfVj5qrkdokJRCvj0gYfFoH2oeDGyN + EAw5Dgzsp697kj4 =
这是第二个加密字符串:
kEN0HUp / dqz8kXA7nYivJG6Jl3haLJjhBq1UfEtQTwaPwizW // 03M0UxF8dBuYZo2BoZ5vsVcXRJF1LpFZLWxDsdeKAC43L2K2OoYRxTn / dA6KmM13YS9xOezGiROQfVj5qrkdokJRCvj0gYfFoH2oeDGyN + EAw5
它们几乎相同,除了第一个字符串中的“Dgzsp697kj4 =”
怎么了?
提前谢谢。
答案 0 :(得分:5)
您正在丢失数据。在您的Encrypt()方法中,您需要调用EncryptFinalBlock()以使填充算法知道您已完成,以便它可以添加填充:
using (CryptoStream cs = new CryptoStream(stream, desProvider.CreateEncryptor(), CryptoStreamMode.Write))
{
byte[] data = Encoding.Default.GetBytes(decryptedString);
cs.Write(data, 0, data.Length);
cs.FlushFinalBlock(); // <-- Add this
return Convert.ToBase64String(stream.ToArray());
}
答案 1 :(得分:1)
我有类似的问题。您应该检查空格是否未附加到解密字符串的末尾。您可能需要关闭空白区域。