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Does Aspose support the use of an external signature server

Does Aspose.PDF support the use of an external signature server?

In such a case the Message Digest (the checksum of the PDF-content) is built on the client. Then the built Message Digest ist sent to a server as byte-array, where the Message-Digest is signed (eg. using a HSM). The Signed Message Digest is sent back from the server to the client where it is embedded to the PDF.

Details are described in the iText-ebook digitalsignatures20130304.pdf which can be found here:

Please take a look at chapter 4.3 and especially 4.3.2.


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Aspose.PDF for .NET API supports signing a PDF file using smart card as well as certificates. However, we are afraid that signing with external HSM, like Azure KeyVault may not be available at the moment. You may visit below documentation articles for your kind reference.