How to encrypt & decrypt a file ?

[MbarkT3STO]

using MBSecurity how can I encrypt & decrypt a file?

[MbarkT3STO]

To encrypt and decrypt any file use : MBSecurity.MBFile static class.

Example 1 : Encrypt a file using your custom Key

string MyFilePath = "C:\\Users\\MBARK\\Desktop\\MyWorkBook.xlsx";

//Get the file bytes
byte[] fileBytes = File.ReadAllBytes(MyFilePath);

//Encrypt the file bytes
var EncryptedData = MBSecurity.MBFile.Encrypt(fileBytes);

Notes :

• The data types returned to EncryptedData variable is MBSecurity.FileEncryptionModel
• The Key property contains the key used in the encryption
• The Key after the encryption will be encrypted

Example 2 : Encrypt a file without Key and IV

• To encrypt a file without using Key and IVuse the
• MBSecurity.MBFile.EncryptWithoutKey static method.
• This method doesn’t need any Key or IV to encrypt data.

            string MyFilePath = "C:\\Users\\MBARK\\Desktop\\MyDoc.docx";

            //Get file as bytes
            byte[] fileBytes  = File.ReadAllBytes(MyFilePath);


            //Encrypt file
            var EncryptedData = MBSecurity.MBFile.EncryptWithoutKey(fileBytes);

Notes :

• If you encrypt data using EncryptWithoutKey method, you should use DecryptWithoutKey method for decryption.

Example 3 : encrypt a file without getting his bytes

• To encrypt a file without getting him as a bytes array, instead of sending his bytes you can send his path

string MyFilePath = "C:\\Users\\MBARK\\Desktop\\MyDoc.pdf";

//Encrypt file
var EncryptedData = MBSecurity.MBFile.EncryptWithoutKey(MyFilePath);

Example 4 : Decrypt an encrypted file

string MyFilePath = "C:\\Users\\MBARK\\Desktop\\MyWorkBook.xlsx";

//Get the file as bytes array
byte[] fileBytes = File.ReadAllBytes(MyFilePath);

//Encrypt the file
var EncryptedData = MBSecurity.MBFile.Encrypt(fileBytes);

//Decrypt the encrypted file
var DecryptedData = MBSecurity.MBFile.Decrypt(EncryptedData.EncryptedBytes, EncryptedData.Key.ToBytes());

Example 5 : Encrypt and decrypt a file without any key or IV

string MyFilePath = "C:\\Users\\MBARK\\Desktop\\MyWorkBook.xlsx";

//Get the file as bytes array
byte[] fileBytes = File.ReadAllBytes(MyFilePath);

//Encrypt the file
var EncryptedData = MBSecurity.MBFile.EncryptWithoutKey(fileBytes);

//Decrypt the encrypted file
var DecryptedData = MBSecurity.MBFile.DecryptWithoutKey(EncryptedData.EncryptedBytes);

Example 6 : Encrypt and decrypt a file from his path

//The file to be encrypted path
string MyFilePath = "C:\\Users\\MBARK\\Desktop\\Elements of Life.mp3";

//Encrypt the file
var EncryptedData = MBSecurity.MBFile.Encrypt(MyFilePath);

//Decrypt the encrypted file
var DecryptedData = MBSecurity.MBFile.Decrypt(EncryptedData.EncryptedBytes, EncryptedData.Key.ToBytes());

Example 7 : Encrypt and decrypt a file using a custom Key

            string MyFilePath = "C:\\Users\\MBARK\\Desktop\\MyXl.xlsx";

            //Key used in encryption
            byte[] Key = "ImTheKey".ToBytes();

            //Get file as bytes
            byte[] fileBytes  = File.ReadAllBytes(MyFilePath);


            //Encrypt the file
            var EncryptedData = MBSecurity.MBFile.Encrypt(fileBytes, Key);


            //Decrypt the encrypted file
            var DecryptedData = MBSecurity.MBFile.DecryptWithoutKey(EncryptedData.EncryptedBytes);

Notes :

• The data types returned to DecryptedData variable is MBSecurity.FileDecryptionModel
• The Key property contains the key used in the encryption and decryption
• The Key after the decryption will be encrypted
• • You can use .ToBytes() provided extension method to convert any string value to bytes array

Important Notes :

• if you used a key and IV for encryption, you should use the encrypted key after encryption and the same IV
• if you used a key for encryption, you should use the encrypted key after encryption
• if you used EncryptWithoutKey method for encryption, you should use DecryptWithoutKeykey for decryption
• You can use MBSecurity.MBXLSX static class for special encryption for Excel files.
• You can use MBSecurity.MBPDF static class for a specialencryption for PDF files.

Global Note :

• You can use many extension methods provided by MBSecurity, ( like .ToBytes() used in 7th example )