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How to Sign a PDF Document with a X.509 Signing Certificate on Android

The PlugPDF SDK allows you to sign and validate your PDF documents with one or more signatures. To do so, please follow these steps.

  1. Prepare an image object. This is the visual appearance of a signature field (optional)
  2. Create a signature field (this is a form field containing a digital signature)
  3. Compute a byte range digest
  4. Inject the computed byte range into the signature field created in Step 2.

Then, validating a PDF document is a two step process:

  1. Get a signature field
  2. Get a computed byte range digest data in the signature field

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How to Sign a PDF Document with a PKI Certificate on iOS

The PlugPDF SDK allows you to sign and validate your PDF documents with one or more signatures. To do so, please follow these steps.

  1. Prepare an image object. This is the visual appearance of a signature field (optional)
  2. Create a signature field (this is a form field containing a digital signature)
  3. Compute a byte range digest
  4. Inject the computed byte range into the signature field created in Step 2.

Then, validating a PDF document is a two step process:

  1. Get a signature field
  2. Get a computed byte range digest data in the signature field

Read more