.NET Digital Signature Library

.NET Digital Signature Library is a classic .NET Framework (3.5 up to 4.8), .NET Standard 2.0 and .NET 6 library. The library can be used in .NET Core 3.1, .NET 5 and .NET 6 projects.

The main function of .NET Digital Signature Library is to digitally sign files in PDF, CAdES or PKCS#7 cryptographic standard (.P7S or .P7M files) using X.509 certificates stored on PFX files or smart cards, USB tokens, HSM’s (Hardware Security Modules) stored on Microsoft Certificate Store or Azure Key Vault certificates.

Also, .NET Digital Signature Library can digitally sign Office, XPS and XML documents (XAdES-BES and XMLDSig format) using X.509 certificates. With this library you can quickly digitally sign .docx, .xlsx, .pptx, .xps and .xml files.

.NET Digital Signature Library can be used to create X.509 certificates in PFX format. Using this library you can quickly create PFX digital certificates and custom certificates with different Key Usage or Enhanced Key Usage.

PDF Digital Signature Features:
– Support for certificates issued on smart cards, USB tokens or HSM devices
– Support for eIDAS QSCD hardware devices
– Support for eIDAS digital certificates (EU Regulation 910/2014)
– Support for Elliptic Curves (ECC) digital certificates
– Support for bypassing smart card PIN
– Support for MS-CAPI, CNG, CSP, KSP
– Support for PKCS#11
– Support for Azure Key Vault certificates
– Batch (bulk) digital signature (sign an entire folder)
– Time Stamping
– PAdES ETSI EN 319 142-1 and LTV (Long Term Validation)
– SHA-256, SHA-384 and SHA-512 support
– Embedding Revocation Information for the signing certificate (PAdES-LTV Long Term Validation)

CAdES Features:
– Support for certificates issued on smart cards, USB tokens or HSM devices
– Support for eIDAS QSCD hardware devices
– Support for eIDAS digital certificates (EU Regulation 910/2014)
– Support for Elliptic Curves (ECC) digital certificates
– Support for bypassing smart card PIN
– Support for MS-CAPI, CNG, CSP, KSP
– Support for PKCS#11
– Support for Azure Key Vault certificates
– Time Stamping
– SHA-256, SHA-384 and SHA-512 support
– CAdES-BES, CAdES-C, CAdES-T support
– Digitally sign and verify large CAdES signed files (100 MB or more)

Digital Certificates Features: 
– Easy to create self-signed, Root and User certificates in PFX format
– SHA-256, SHA-512, RSA 2048, RSA 4096 support
– Certificate validation against local time, CRL and OCSP
– Easy to configure Key Usage and Enhanced Key Usage

PKI Interoperability.NET Digital Signature Library can access and use X.509 certificates and associated private keys, stored on smart cards, USB tokens, PFX files or Azure Key Vault certificates (eIDAS qualified digital certificates are supported).

.NET Digital Signature Library can be used on Windows desktop systems. For development you can use Visual Studio 2008 or later (including Visual Studio 2022).

Operating Systems Compatibility: Windows XP (limited), Windows 7 or later (including Windows 11 and Windows Server 2022).

Programming Languages: C#, VB.NET, ASP.NET, Visual C++, Windows PowerShell. The library is compiled for .NET Framework 3.5 up to .NET Framework 4.8. The .NET Standard 2.0 and the .NET 6 version of the library is also available. The library can be used in .NET Core 3.1, .NET 5 and .NET 6 projects.

Licensing:
.NET Digital Signature Library can be used by companies, freelancers or software vendors, who develop their software for third-parties (companies or individuals) or for internal company use.

The license is a lifetime license. There is no additional cost like monthly / annual fees or fees per use. When a new version is released you can continue using your purchased version as usual.

The source code of the entire library (C#, 100% managed code written in Visual Studio) is included if you choose to purchase a Full License.

The technical support and updates are free for 12 months after purchase. If you need help with our software, please contact us to receive prompt assistance from our technical support team. We offer free before-and-after purchase technical support for our programs. Technical support is provided by email only. Email response time is usually less than 24 hours.

60 Day Money Back Guarantee – If you are not pleased with our software for any reason, you are entitled to our 60 day no hassle, no questions asked, money back guarantee.

License Type Price (€) Buy with PayPal Buy with credit card
Full License
(source code included, unlimited developers)
690 EUR (990 EUR)
Lifetime License
Single Developer License
490 EUR
Lifetime License
Technical Support The technical support is free for 12 months after purchase.
Purchase Upgrade and Support package.

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Download .NET Digital Signature Library with Visual Studio Sample Projects
(latest version: 6.0)

We are specialized in the development of custom software applications. .NET Signature Library can be customized depending on the needs of your business.

If you are interested in our .NET Signature Library or you need any other customization, please request a quote.

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