Encryption/Decryption Using C#

Posted by Prince | 7:11:00 PM | | 0 comments »

Encryption/Decryption of a file/string using C#:
                                                   You can use the following code for Encryption/Decryption of a file or  a string. Here you can Encrypt /Decrypt a file  or a string by using the following methods. You just pass parameters as input in to that methods and you got suitable output.
Decrypt File-to-File
Encrypt File-to-File
Encrypt String-to-File
Decrypt File-to-String
Code:
using System;
using 
System.Collections.Generic;
using 
System.Text;
using 
System.Security.Cryptography;
using 
System.IO;

namespace 
BHI.Rats
{
    
/// <summary>
    /// RatsEncryptionManager is responsible for encrypting and decrypting the files.
    /// </summary>
    
public static class  RatsEncryptionManager
    {
        
private const string passKey "c0ntr0l1";

        
/// <summary>
        /// Decrypts the input file (strInputFileName) and creates a new decrypted file (strOutputFileName)
        /// </summary>
        /// <param name="strInputFileName">input file name</param>
        /// <param name="strOutputFileName">output file name</param>
        
public static void DecryptFiletoFile(string strInputFileName, string strOutputFileName)
        {
            
string strFileData "";
            using 
(FileStream inputStream = new FileStream(strInputFileName, FileMode.Open, FileAccess.Read))
            {
                DESCryptoServiceProvider cryptic 
= new DESCryptoServiceProvider();

                
cryptic.Key ASCIIEncoding.ASCII.GetBytes(passKey);
                
cryptic.IV ASCIIEncoding.ASCII.GetBytes(passKey);

                
CryptoStream crStream = new CryptoStream(inputStream, cryptic.CreateDecryptor(), CryptoStreamMode.Read);

                
StreamReader reader = new StreamReader(crStream);

                
strFileData reader.ReadToEnd();

                
reader.Close();
                
inputStream.Close();
            
}

            
if (File.Exists(strOutputFileName))
            {
                File.Delete(strOutputFileName)
;
            
}
            
using (StreamWriter outputStream = new StreamWriter(strOutputFileName))
            {
                outputStream.Write(strFileData, 
0, strFileData.Length);

                
outputStream.Close();
            
}

        }
        
/// <summary>
        /// Encrypts the input file(strInputFileName) and creates a new encrypted file(strOutputFileName)
        /// </summary>
        /// <param name="strInputFileName">input file name</param>
        /// <param name="strOutputFileName">output file name</param>
        
public static void EncryptFiletoFile(string strInputFileName, string strOutputFileName)
        {
            
byte&#91;] fileBuffer;

            using 
(FileStream inputStream = new FileStream(strInputFileName, FileMode.Open, FileAccess.Read))
            {
                fileBuffer 
= new byte&#91;inputStream.Length];

                
inputStream.Read(fileBuffer, 0, fileBuffer.GetLength(0));


                
inputStream.Close();
            
}
            
if (File.Exists(strOutputFileName))
            {
                File.Delete(strOutputFileName)
;
            
}
            
using (FileStream outputStream = new FileStream(strOutputFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
            {
                DESCryptoServiceProvider cryptic 
= new DESCryptoServiceProvider();

                
cryptic.Key ASCIIEncoding.ASCII.GetBytes(passKey);
                
cryptic.IV ASCIIEncoding.ASCII.GetBytes(passKey);

                
CryptoStream crStream = new CryptoStream(outputStream, cryptic.CreateEncryptor(), CryptoStreamMode.Write);

                
crStream.Write(fileBuffer, 0, fileBuffer.Length);

                
crStream.Close();
            
}
        }
        
/// <summary>
        /// Encrypts the input string and creates a new encrypted file(strOutputFileName)
        /// </summary>
        /// <param name="strInputString">input string name</param>
        /// <param name="strOutputFileName">output file name</param>
        
public static void EncryptStringtoFile(string strInputString, string strOutputFileName)
        {
            
if (File.Exists(strOutputFileName))
            {
                File.Delete(strOutputFileName)
;
            
}
            
using (FileStream outputStream = new FileStream(strOutputFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite))
            {
                DESCryptoServiceProvider cryptic 
= new DESCryptoServiceProvider();

                
cryptic.Key ASCIIEncoding.ASCII.GetBytes(passKey);
                
cryptic.IV ASCIIEncoding.ASCII.GetBytes(passKey);

                
CryptoStream crStream = new CryptoStream(outputStream, cryptic.CreateEncryptor(), CryptoStreamMode.Write);

                byte
&#91;] buffer ASCIIEncoding.ASCII.GetBytes(strInputString);

                
crStream.Write(buffer, 0, buffer.Length);

                
crStream.Close();
            
}
        }
        
/// <summary>
        /// Decrypts the input file (strInputFileName) and creates a new decrypted file (strOutputFileName)
        /// </summary>
        /// <param name="strInputFileName">input file name</param>
        
public static string DecryptFiletoString(string strInputFileName)
        {
            
string strFileData "";
            using 
(FileStream inputStream = new FileStream(strInputFileName, FileMode.Open, FileAccess.Read))
            {
                DESCryptoServiceProvider cryptic 
= new DESCryptoServiceProvider();

                
cryptic.Key ASCIIEncoding.ASCII.GetBytes(passKey);
                
cryptic.IV ASCIIEncoding.ASCII.GetBytes(passKey);

                
CryptoStream crStream = new CryptoStream(inputStream, cryptic.CreateDecryptor(), CryptoStreamMode.Read);

                
StreamReader reader = new StreamReader(crStream);

                
strFileData reader.ReadToEnd();

                
reader.Close();
                
inputStream.Close();
            
}

            
return strFileData;
        
}
    }
}

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