我编写了以下用于编码和解码字符串数据的类(一键对称算法):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace MyProject.Classes
{
public static class SymmetricEncryption
{
private const string MyKey = "bla bla bla";
private static string _AlgorithmName;
public static string AlgorithmName
{
get { return _AlgorithmName; }
set { _AlgorithmName = value; }
}
public static string EncryptData(string ClearData)
{
// Convert string ClearData to byte array
byte[] ClearData_byte_Array = Encoding.UTF8.GetBytes(ClearData);
// Now Create The Algorithm
SymmetricAlgorithm Algorithm = SymmetricAlgorithm.Create(AlgorithmName);
Algorithm.Key = Encoding.UTF8.GetBytes(MyKey);
// Encrypt information
MemoryStream Target = new MemoryStream();
// Append IV
Algorithm.GenerateIV();
Target.Write(Algorithm.IV, 0, Algorithm.IV.Length);
// Encrypt Clear Data
CryptoStream cs = new CryptoStream(Target, Algorithm.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(ClearData_byte_Array, 0, ClearData_byte_Array.Length);
cs.FlushFinalBlock();
// Output
byte[] Target_byte_Array = Target.ToArray();
string Target_string = Convert.ToBase64String(Target_byte_Array);
return Target_string;
}
public static string DecryptData(string EncryptedData)
{
byte[] EncryptedData_byte_Array = Convert.FromBase64String(EncryptedData);
// Now Create The Algorithm
SymmetricAlgorithm Algorithm = SymmetricAlgorithm.Create(AlgorithmName);
Algorithm.Key = Encoding.UTF8.GetBytes(MyKey);
// Decrypt information
MemoryStream Target = new MemoryStream();
// Read IV
int ReadPos = 0;
byte[] IV = new byte[Algorithm.IV.Length];
Array.Copy(EncryptedData_byte_Array, IV, IV.Length);
Algorithm.IV = IV;
ReadPos += Algorithm.IV.Length;
// Decrypt Encrypted Data
CryptoStream cs = new CryptoStream(Target, Algorithm.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(EncryptedData_byte_Array, ReadPos, EncryptedData_byte_Array.Length - ReadPos);
cs.FlushFinalBlock();
// Output
byte[] Target_byte_Array = Target.ToArray();
string Target_string = Encoding.UTF8.GetString(Target_byte_Array);
return Target_string;
}
}
}
和用法如下:
protected void Page_Load(object sender, EventArgs e)
{
SymmetricEncryptionUtility.AlgorithmName = "TripleDES";
Response.Write(SymmetricEncryptionUtility.EncryptData("1234-4567-8910-2345"));
}
我对 MyKey 有一些问题 ->我们如何为对称算法提供硬编码密钥并在上层类中使用它?
上面的代码错误如下:
Server Error in '/' Application.
Specified key is not a valid size for this algorithm. Description: An unhandled exception occurred during the
执行当前的 Web 请求。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。
Exception Details:
System.Security.Cryptography.CryptographicException:指定的密钥不是此算法的有效大小。
我该如何解决这个错误?
提前致谢