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Private Function myEncrypt(ByVal Code As String) As String
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Dim Result As String = ""
Dim CurrentChar As Char
For i As Integer = 0 To Code.Length - 1
CurrentChar = Code.Substring(i, 1)
Select Case Code.Substring(i, 1)
Case "Z"
Result = "a"
Case "z"
Result = "A"
Case Else
Result = Chr(Asc(CurrentChar) + 1)
End Select
Next
Return Result
End Function
'vb.net 2005 调试通过
"采用DES算法"这个说法不明确，首先是使用多少位的DES进行加密，通常是128位或192位，其次是，要先把主密钥转化成散列，才能供DES进行加密，转化的方法是什么没有明确，通常是md5，所以有的银行卡说是128位md5 3DS就是指用md5转换主密钥散列，用DES进行加密，但是DES本身是64位（包含校验码），2DES是128位，3DES是192位，但是没有2DES的叫法，所以128位、192位统称3DES
要完整的md5+3DS实例，需要100分以上，要不到我的空间中查找相关的文章
我觉得你的并不是RSA加密解密算法。
在.net的有一个System.Security.Cryptography的命名空间，里面有一RSACryptoServiceProvider的类用来对byte进行RSA加密解密。
具体例子如下：
using System;
using System.Security.Cryptography;
using System.Text;
class RSACSPSample
{
static void Main()
{
try
{
//Create a UnicodeEncoder to convert between byte array and string.
UnicodeEncoding ByteConverter = new UnicodeEncoding();
//Create byte arrays to hold original, encrypted, and decrypted data.
byte[] dataToEncrypt = ByteConverter.GetBytes("Data to Encrypt");
byte[] encryptedData;
byte[] decryptedData;
//Create a new instance of RSACryptoServiceProvider to generate
//public and private key data.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Pass the data to ENCRYPT, the public key information
//(using RSACryptoServiceProvider.ExportParameters(false),
//and a boolean flag specifying no OAEP padding.
encryptedData = RSAEncrypt(dataToEncrypt,RSA.ExportParameters(false), false);
//Pass the data to DECRYPT, the private key information
//(using RSACryptoServiceProvider.ExportParameters(true),
//and a boolean flag specifying no OAEP padding.
decryptedData = RSADecrypt(encryptedData,RSA.ExportParameters(true), false);
//Display the decrypted plaintext to the console.
Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
}
catch(ArgumentNullException)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine("Encryption failed.");
}
}
static public byte[] RSAEncrypt(byte[] DataToEncrypt, RSAParameters RSAKeyInfo, bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This only needs
//toinclude the public key information.
RSA.ImportParameters(RSAKeyInfo);
//Encrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Encrypt(DataToEncrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.Message);
return null;
}
}
static public byte[] RSADecrypt(byte[] DataToDecrypt, RSAParameters RSAKeyInfo,bool DoOAEPPadding)
{
try
{
//Create a new instance of RSACryptoServiceProvider.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Import the RSA Key information. This needs
//to include the private key information.
RSA.ImportParameters(RSAKeyInfo);
//Decrypt the passed byte array and specify OAEP padding.
//OAEP padding is only available on Microsoft Windows XP or
//later.
return RSA.Decrypt(DataToDecrypt, DoOAEPPadding);
}
//Catch and display a CryptographicException
//to the console.
catch(CryptographicException e)
{
Console.WriteLine(e.ToString());
return null;
}
}
}
[Visual Basic]
Try
'Create a new RSACryptoServiceProvider object.
Dim RSA As New RSACryptoServiceProvider()
'Export the key information to an RSAParameters object.
'Pass false to export the public key information or pass
'true to export public and private key information.
Dim RSAParams As RSAParameters = RSA.ExportParameters(False)
Catch e As CryptographicException
'Catch this exception in case the encryption did
'not succeed.
Console.WriteLine(e.Message)
End Try
[C#]
try
{
//Create a new RSACryptoServiceProvider object.
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
//Export the key information to an RSAParameters object.
//Pass false to export the public key information or pass
//true to export public and private key information.
RSAParameters RSAParams = RSA.ExportParameters(false);
}
catch(CryptographicException e)
{
//Catch this exception in case the encryption did
//not succeed.
Console.WriteLine(e.Message);
}
最简单的设置一个公共变量Code和Key，前者用于存原密码，后者用于存密钥，自定义一个加密函数trans，用于转换Code和Key并显示在text2当中，解密时判定输入的密钥与Key是否符合，如果符合就把Code显示出来。也就是说，这个加密函数只是用于加密转换时，在解密的时候，可以不用它而直接读取Code变量。代码如下：
Dim Code As String, Key As String
Private Sub Command1_Click() '这是加密过程，加密的同时把密码与密钥存入变量Code和Key中
Label2.Caption = "加密后的密码"
Code = Text1.Text
Key = Text3.Text
Text2.Text = trans(Key) trans(Code)
End Sub
Private Sub Command2_Click() '这是解密过程
If Text3.Text Key Then
MsgBox "密钥错误，请重新输入"
Else
MsgBox "原密码是：" Code
End If
End Sub
Private Function trans(s As String) As String '这是加密函数
Dim ch As String
For i = 1 To Len(s)
If Mid(s, i, 1) Like "[A-Z]" Then
ch = ch Chr(155 - Asc(Mid(s, i, 1)))
ElseIf Mid(s, i, 1) Like "[a-z]" Then
ch = ch Chr(219 - Asc(Mid(s, i, 1)))
Else
ch = ch Mid(s, i, 1)
End If
Next
trans = ch
End Function
Private Sub Form_Load() '这是所有用到的控件
Label1.Caption = "密码"
Label2.Caption = "加密后的密码"
Label3.Caption = "密钥"
Command1.Caption = "加密"
Command2.Caption = "解密"
End Sub
补充：我测试没问题。Text2中是加密后的密文，解密时会先判定用户在Text3中所输入的密钥是否与Key变量中保存的密钥相同，如果相同的话才会显示原来的密码。如果出错的话，请检查一下这8个控件，3个Text，3个Label，2个Command，你可以新建一个程序，然后在窗体上放上这8个控件，都用默认属性，然后把代码复制过去，再运行一下试试。