在C#中是否有可能加密PDF文件,并对其进行解密?我已经对SQL数据库中的记录进行了加密,但我需要对PDF文件进行加密。我该怎么做呢?
在C#中是否有可能加密PDF文件,并对其进行解密?我已经对SQL数据库中的记录进行了加密,但我需要对PDF文件进行加密。我该怎么做呢?
var myFile = your file;
if (System.IO.File.Exists (myFile.Path)) {
var decreypt = new FileEncryptDecrypt ();
decreypt.DecryptFile (myFile.Path/*input file*/, tempFilePath/*output*/);
}
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace Website.Server
{
public class FileEncryptDecrypt
{
// private const string password = @"myKey123"; // Your Key Here
/// <summary>
/// Encrypts a file using AES
/// </summary>
/// <param name="inputFile">inputFile Path</param>
/// <param name="outputFile">outputFile path</param>
public void EncryptFile(string inputFile, string outputFile)
{
try
{
UnicodeEncoding UE = new UnicodeEncoding();
byte[] key = UE.GetBytes(Settings.ServerSettings.EncDecKey);
string cryptFile = outputFile;
FileStream fsCrypt = new FileStream(cryptFile, FileMode.Create);
// RijndaelManaged RMCrypto = new RijndaelManaged();
var RMCrypto = Aes.Create();
CryptoStream cs = new CryptoStream(fsCrypt,
RMCrypto.CreateEncryptor(key, key),
CryptoStreamMode.Write);
FileStream fsIn = new FileStream(inputFile, FileMode.Open);
int data;
while ((data = fsIn.ReadByte()) != -1)
cs.WriteByte((byte)data);
fsIn.Dispose();
cs.Dispose();
fsCrypt.Dispose();
}
catch(Exception ex)
{
var msg=ex.Message ; /// MessageBox.Show("Encryption failed!", "Error");
}
}
/// <summary>
/// Decrypts a file using Aes .
/// </summary>
/// <param name="inputFile">inputFile Path</param>
/// <param name="outputFile">outputFile path</param>
public void DecryptFile(string inputFile, string outputFile)
{
try
{
UnicodeEncoding UE = new UnicodeEncoding();
byte[] key = UE.GetBytes(Settings.ServerSettings.EncDecKey);
FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
var RMCrypto = Aes.Create();
// RijndaelManaged RMCrypto = new RijndaelManaged();
CryptoStream cs = new CryptoStream(fsCrypt,
RMCrypto.CreateDecryptor(key, key),
CryptoStreamMode.Read);
FileStream fsOut = new FileStream(outputFile, FileMode.Create);
int data;
while ((data = cs.ReadByte()) != -1)
fsOut.WriteByte((byte)data);
fsOut.Dispose();
cs.Dispose();
fsCrypt.Dispose();
}
catch(Exception ex)
{
var msg=ex .Message ;
}
}
private static void EncryptData(String inName, String outName, byte[] rijnKey, byte[] rijnIV)
{
//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.
var rijn = System.Security.Cryptography.Aes.Create();
// SymmetricAlgorithm rijn = new SymmetricAlgorithm .Create(); //Creates the default implementation, which is RijndaelManaged.
CryptoStream encStream = new CryptoStream(fout, rijn.CreateEncryptor(rijnKey, rijnIV), CryptoStreamMode.Write);
Console.WriteLine("Encrypting...");
//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;
Console.WriteLine("{0} bytes processed", rdlen);
}
encStream.Dispose();
fout.Dispose();
fin.Dispose();
}
}
}