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[] fileBuffer;
using (FileStream inputStream = new FileStream(strInputFileName, FileMode.Open, FileAccess.Read))
{
fileBuffer = new byte[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[] 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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