C # reversible and irreversible MD5 encryption,

C # reversible and irreversible MD5 encryption,

1. method 1 (irreversible encryption) srxljl

Public string EncryptPassword (string PasswordString, string PasswordFormat)
{
String encryptPassword = null;
If (PasswordFormat = "SHA1 "){
EncryptPassword = FormsAuthortication. HashPasswordForStoringInConfigFile (PasswordString, "SHA1 ");
}
Elseif (PasswordFormat = "MD5 ")
{

EncryptPassword = FormsAuthortication. HashPasswordForStoringInConfigFile (PasswordString, "MD5 ");
}
Return encryptPassword;
}

 

2. method 2 (reversible encryption) srxljl

 

Public interface IBindesh
{
String encode (string str );
String decode (string str );
}

Public class EncryptionDecryption: IBindesh
{
Public string encode (string str)
{
String htext = "";

For (int I = 0; I <str. Length; I ++)
{
Htext = htext + (char) (str [I] + 10-1*2 );
}
Return htext;
}

Public string decode (string str)
{
String dtext = "";

For (int I = 0; I <str. Length; I ++)
{
Dtext = dtext + (char) (str [I]-10 + 1*2 );
}
Return dtext;
}

 

3. Method 3 (reversible encryption) srxljl

 

Const string KEY_64 = "VavicApp"; // note that it is 8 characters long and 64-bit

Const string IV_64 = "VavicApp ";
Public string Encode (string data)
{
Byte [] byKey = System. Text. ASCIIEncoding. ASCII. GetBytes (KEY_64 );
Byte [] byIV = System. Text. ASCIIEncoding. ASCII. GetBytes (IV_64 );

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider ();
Int I = cryptoProvider. KeySize;
MemoryStream MS = new MemoryStream ();
CryptoStream cst = new CryptoStream (MS, cryptoProvider. CreateEncryptor (byKey, byIV), CryptoStreamMode. Write );

StreamWriter sw = new StreamWriter (cst );
Sw. Write (data );
Sw. Flush ();
Cst. FlushFinalBlock ();
Sw. Flush ();
Return Convert. ToBase64String (ms. GetBuffer (), 0, (int) ms. Length );

}

Public string Decode (string data)
{
Byte [] byKey = System. Text. ASCIIEncoding. ASCII. GetBytes (KEY_64 );
Byte [] byIV = System. Text. ASCIIEncoding. ASCII. GetBytes (IV_64 );

Byte [] byEnc;
Try
{
ByEnc = Convert. FromBase64String (data );
}
Catch
{
Return null;
}

DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider ();
MemoryStream MS = new MemoryStream (byEnc );
CryptoStream cst = new CryptoStream (MS, cryptoProvider. CreateDecryptor (byKey, byIV), CryptoStreamMode. Read );
StreamReader sr = new StreamReader (cst );
Return sr. ReadToEnd ();
}

 

4. md5 (32-bit encryption) srxljl

Public string GetMD5 (string s, string _ input_charset)
{

/// <Summary>
/// ASP-compatible MD5 Encryption Algorithm
/// </Summary>

MD5 md5 = new MD5CryptoServiceProvider ();
Byte [] t = md5.ComputeHash (Encoding. GetEncoding (_ input_charset). GetBytes (s ));
StringBuilder sb = new StringBuilder (32 );
For (int I = 0; I <t. Length; I ++)
{
Sb. Append (t [I]. ToString ("x"). PadLeft (2, '0 '));
}
Return sb. ToString ();
}

(16-bit encryption) srxljl

 

Public static string GetMd5Str (string ConvertString)
{
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider ();
String t2 = BitConverter. ToString (md5.ComputeHash (UTF8Encoding. Default. GetBytes (ConvertString), 4, 8 );
T2 = t2.Replace ("-","");
Return t2;
}

 

5. Add and unbind the text file srxljl

 

// Encrypt the file
Private static void EncryptData (String inName, String outName, byte [] cipher ey, byte [] desIV)
{
// Create the file streams to handle the input and output files.
FileStream fin = new FileStream (inName, FileMode. Open, FileAccess. Read );
FileStream fout = new FileStream (outName, FileMode. OpenOrCreate, FileAccess. Write );
Fout. SetLength (0 );

// Create variables to help with read and write.
Byte [] bin = new byte [100]; // This is intermediate storage for the encryption.
Long rdlen = 0; // This is the total number of bytes written.
Long totlen = fin. Length; // This is the total length of the input file.
Int len; // This is the number of bytes to be written at a time.

DES des = new DESCryptoServiceProvider ();
CryptoStream encStream = new CryptoStream (fout, des. CreateEncryptor (Cipher ey, desIV), CryptoStreamMode. Write );

// Read from the input file, then encrypt and write to the output file.
While (rdlen <totlen)
{
Len = fin. Read (bin, 0,100 );
EncStream. Write (bin, 0, len );
Rdlen = rdlen + len;
}

EncStream. Close ();
Fout. Close ();
Fin. Close ();
}

// Decrypt the file
Private static void DecryptData (String inName, String outName, byte [] cipher ey, byte [] desIV)
{
// Create the file streams to handle the input and output files.
FileStream fin = new FileStream (inName, FileMode. Open, FileAccess. Read );
FileStream fout = new FileStream (outName, FileMode. OpenOrCreate, FileAccess. Write );
Fout. SetLength (0 );

// Create variables to help with read and write.
Byte [] bin = new byte [100]; // This is intermediate storage for the encryption.
Long rdlen = 0; // This is the total number of bytes written.
Long totlen = fin. Length; // This is the total length of the input file.
Int len; // This is the number of bytes to be written at a time.

DES des = new DESCryptoServiceProvider ();
CryptoStream encStream = new CryptoStream (fout, des. CreateDecryptor (Cipher ey, desIV), CryptoStreamMode. Write );

// Read from the input file, then encrypt and write to the output file.
While (rdlen <totlen)
{
Len = fin. Read (bin, 0,100 );
EncStream. Write (bin, 0, len );
Rdlen = rdlen + len;
}

EncStream. Close ();
Fout. Close ();
Fin. Close ();
}

In the C language, what is the symbol (->) and how to use it?

This is a symbol in the struct pointer. Write a program to explain it, for example:
# Include <stdio. h>
Struct STU // define a struct
{
Int num;
} Stu;
Int main ()
{
Struct STU * p; // defines a struct pointer.
P = stu; // p points to the struct variable stu.
Stu. num = 100; // attaches an initial value to the struct member num.
Printf ("% d", p-> num); // output the num value in stu
Return;
}
As you can see, the-> method is to reference the variable in the struct !!
Format: p-> struct member (such as p-> num)
The function is equivalent to stu. num or (* p). num.
I don't know. You don't understand, and don't understand call me. O (∩ _ ∩) O ~
Hope to adopt it.

In the C language, what is the symbol (->) and how to use it?

This is a symbol in the struct pointer. Write a program to explain it, for example:
# Include <stdio. h>
Struct STU // define a struct
{
Int num;
} Stu;
Int main ()
{
Struct STU * p; // defines a struct pointer.
P = stu; // p points to the struct variable stu.
Stu. num = 100; // attaches an initial value to the struct member num.
Printf ("% d", p-> num); // output the num value in stu
Return;
}
As you can see, the-> method is to reference the variable in the struct !!
Format: p-> struct member (such as p-> num)
The function is equivalent to stu. num or (* p). num.
I don't know. You don't understand, and don't understand call me. O (∩ _ ∩) O ~
Hope to adopt it.