DevExpress-Examples/pdf-document-api-custom-signer

Implement a custom signer based on the Bouncy Castle C# API and use a custom digest calculator to calculate a document hash.

PDF Document API - Use a Custom Signer Class to Apply Signatures to a PDF Document

The PDF Document API allows you to replace a built-in PKCS#7 signature builder (the Pkcs7Signer class) with a custom signer.

The code sample project shows how to create a Pkcs7SignerBase descendant to implement a custom signer based on the Bouncy Castle C# API and calculate a document hash using a custom digest calculator.

To sign a PDF file using an external web service, retrieve a certificate/certificate chain from the service, and calculate the document hash. Then, sign the calculated document hash with a private key obtained from the external service in the SignDigest method of the BouncyCastleSigner class.

Important

The Universal Subscription or Office File API Subscription is required to use this example in production code. Please refer to the following page for pricing information: DevExpress Subscriptions

Files to Review

• Program.cs (VB: Program.vb)
• BouncyCastleTsaClient.cs (VB :BouncyCastleTsaClient.vb)

Documentation

• Sign Documents

More Examples

• Use a Custom Timestamp Client to Apply Signatures to a Document
• Use the Azure Key Vault API to Sign a PDF document
• Validate Document Signatures

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