Sign documents with encrypted QR-code text Leave feedback

GroupDocs.Signature provides ability to secure QR-code signature text with standard or custom encryption. Standard encryption is implemented over class SymmetricEncryption class. Creation of this object expects 3 arguments like encryption algorithm enumeration SymmetricAlgorithmType with one of following values (DES, TripleDES, RC2, Rijndael), string value key and string value salt.

Here are the steps to secure QR-code text with standard encryption with GroupDocs.Signature:

• Create new instance of Signature  class and pass source document path or stream as a constructor parameter.
• Compose object of SymmetricEncryption class with required algorithm and secure pair key/salt
• Create objects of QrCodeSignOptions class and setup property DataEncryption with object of SymmetricEncryption
• Call Sign method of Signature class instance and pass QrCodeSignOptions to it.

This example shows how to sign document with secure QR-code signature text.

using (Signature signature = new Signature("sample.pdf"))
{
    // setup key and passphrase
    string key = "1234567890";
    string salt = "1234567890";
    // create data encryption
    IDataEncryption encryption = new SymmetricEncryption(SymmetricAlgorithmType.Rijndael, key, salt);
    // setup QR-Code options
    QrCodeSignOptions options = new QrCodeSignOptions()
    {
        //setup text to be secured
        Text = "This is private text to be secured.",
        EncodeType = QrCodeTypes.QR,
        // specify text encryption
        DataEncryption = encryption,
        // locate and aligh signature
        Height = 100,
        Width = 100,
        VerticalAlignment = VerticalAlignment.Bottom,
        HorizontalAlignment = HorizontalAlignment.Right,
        Margin = new Padding() {  Right = 10, Bottom = 10}
    };
    // sign document to file
    signature.Sign("QRCodeEncryptedText.pdf", options);
}

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for .NET examples, plugins, and showcase
• GroupDocs.Signature for Java examples, plugins, and showcase
• Document Signature for .NET MVC UI Example
• Document Signature for .NET App WebForms UI Example
• Document Signature for Java App Dropwizard UI Example
• Document Signature for Java Spring UI Example

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To generate QR codes and/or sign your files with QR codes for free, you can use the QR Code Generator online app.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the other online apps from the GroupDocs.Signature App Product Family.