BmpPwd 2.0.3

Using the default AES Cipher (Rijndael)

Note: On .NET Core and .NET Standard the Rijndael Implementation uses a key block-size of 128 bytes. On .NET Framework 256 bytes are used. For compatibility reasons, BmpPwd uses 128 bytes on all platforms. See: Cipher.cs. Use BmpPwd.Encrypt and supply a custom Cipher() instance with a custom keysize parameter.

Encrypt a string

• C#:

using System.Drawing.Common;
using BmpPwd;
// ...
var encryptedImage = BmpPwd.BmpPwd.Encrypt("MyPassword", "The string to be encrypted");

• VB:

Imports System.Drawing.Common
Imports BmpPwd
' ...
Dim encryptedImage = BmpPwd.BmpPwd.Encrypt("MyPassword", "The string to be encrypted")

⚠️: Be careful when saving the Image to not use lossy image compression, like JPEG. Lossy-compressing the Image will result in losing details and results in an un-decryptable image. Save as PNG or BMP to maintain pixel quality.

Decrypt an Image

• C#:

using System.Drawing.Common;
using BmpPwd;
// ...
string decryptedText = BmpPwd.Decrypt("MyPassword", encryptedImage);

• VB:

Imports System.Drawing.Common
Imports BmpPwd
' ...
Dim decryptedText = BmpPwd.Decrypt("MyPassword", encryptedImage)

Custom Encryption Implementation

Implement your custom Encryption class

• C#:

public class MyCryptoClass : ICrypto {
    // Implement Encrypt(..) and Decrypt(..) here
}

• VB:

Public Class MyCryptoClass
    Implements ICrypto
        ' Implement Encrypt(..) and Decrypt(..) here
End Class

Use

• C#:

using System.Drawing.Common;
using BmpPwd;
// ...
var encryptedImage = BmpPwd.BmpPwd.Encrypt("MyPassword",
                                     "The string to be encrypted",
                                     new MyCryptoClass(),
                                     BmpPwd.DrawingScheme.Square,
                                     BmpPwd.ColorScheme.BlueMixed);

• VB:

Imports System.Drawing.Common
Imports BmpPwd
' ...
Dim encryptedImage = BmpPwd.BmpPwd.Encrypt(
    "MyPassword",
    "The string to be encrypted",
    new MyCryptoClass(),
    BmpPwd.DrawingScheme.Square,
    BmpPwd.ColorScheme.BlueMixed)