x2tyzAKs

1public static string DecryptFile(string secretKey, string inputFile, string outputFile)
2        {
3            try
4            {
5                // We are using an AES Crypto with ECB and PKCS7 Padding
6                using (RijndaelManaged aes = new RijndaelManaged())
7                {
8                    byte[] key = ASCIIEncoding.UTF8.GetBytes(secretKey);
9                    byte[] IV = ASCIIEncoding.UTF8.GetBytes(secretKey);
10
11                    aes.Mode = CipherMode.ECB;
12                    aes.Padding = PaddingMode.PKCS7;
13                    
14                    using (FileStream fsCrypt = new FileStream(inputFile, FileMode.Open))
15                    {
16                        using (FileStream fsOut = new FileStream(outputFile, FileMode.Create))
17                        {
18                            using (ICryptoTransform decryptor = aes.CreateDecryptor(key, IV))
19                            {
20                                Console.WriteLine(decryptor.ToString());
21                                using (CryptoStream cs = new CryptoStream(fsCrypt, decryptor, CryptoStreamMode.Read))
22                                {
23                                    int data;
24                                    while ((data = cs.ReadByte()) != -1)
25                                    {
26                                        fsOut.WriteByte((byte)data);
27                                       // Console.WriteLine((byte)data);
28                                    }
29                                    cs.Flush();
30                                    cs.Close();
31                                    fsOut.Flush();
32                                    fsOut.Close();
33                                    fsCrypt.Close();
34                                }
35                            }
36                        }
37                    }
38                }
39            }
40
41            catch (Exception ex)
42            {
43                // failed to decrypt file
44                Console.WriteLine("Errors : "+ex.Message);
45            }
46            return "success";
47        }