我创建了一个简单的加密和解密程序,使用了
我按照以下步骤测试了我的程序:
请问有人能帮助我理解我的程序出了什么问题,并防止程序解密错误的数据。
以下是程序输出:
AESManaged
类。密码和IV是使用Rfc2898DeriveBytes
从预定义密码生成的。我按照以下步骤测试了我的程序:
- 将样本文本输入程序并捕获加密文本。
- 将相同的加密文本输入程序并验证解密后的文本与原始文本相同。
- 修改第2步中加密文本中“=”前面的字母(改为下一个字母),并使用相同的密钥和IV进行解密,然后我收到了我的原始文本。
请问有人能帮助我理解我的程序出了什么问题,并防止程序解密错误的数据。
以下是程序输出:
Please put in input message
Some Text
Encrypted text is "xJzgOiMzimNOY6UsB+TNw9gUmcpdiZxQq70FxwbmkCc="
Please put in encrypted text to decrypt
xJzgOiMzimNOY6UsB+TNw9gUmcpdiZxQq70FxwbmkCc=
Decrypted text is "Some Text"
Please put in encrypted text to decrypt <<here I have modified "c=" to "d=">>
xJzgOiMzimNOY6UsB+TNw9gUmcpdiZxQq70FxwbmkCd=
Decrypted text is "Some Text"
Enter "Exit" to exit!
AesExample.cs:
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Aes_Example
{
class AesExample
{
public static void Main()
{
string action, plainText, encryptedText, decryptedText;
Begin:
Console.WriteLine("Please put in input message");
plainText = Console.ReadLine();
encryptedText = Encrypt(plainText);
Console.WriteLine("Encrypted text is \"{0}\"", encryptedText);
Console.WriteLine("Please put in encrypted text to decrypt");
encryptedText = Console.ReadLine();
decryptedText = Decrypt(encryptedText);
Console.WriteLine("Decrypted text is \"{0}\"", decryptedText);
Console.WriteLine("Please put in encrypted text to decrypt");
encryptedText = Console.ReadLine();
decryptedText = Decrypt(encryptedText);
Console.WriteLine("Decrypted text is \"{0}\"", decryptedText);
Console.WriteLine("Enter \"Exit\" to exit!");
action = Console.ReadLine();
if (action.ToUpper() != "EXIT") { goto Begin; }
}
public static string Encrypt(string clearText)
{
string EncryptionKey = "TESTPWD@#52";
byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
using (AesManaged encryptor = new AesManaged())
{
Rfc2898DeriveBytes pdb = new
Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(clearBytes, 0, clearBytes.Length);
cs.Close();
}
clearText = Convert.ToBase64String(ms.ToArray());
}
}
return clearText;
}
public static string Decrypt(string cipherText)
{
string EncryptionKey = "TESTPWD@#52";
byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (AesManaged encryptor = new AesManaged())
{
Rfc2898DeriveBytes pdb = new
Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
cipherText = Encoding.Unicode.GetString(ms.ToArray());
}
}
return cipherText;
}
}
}