.NET (C#)

This guide shows you how to use implement Criipto Signatures in .NET to sign PAdeS-LTA documents using MitID, BankID or any other eID supported by Criipto Verify.

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Getting started

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Requirements

This library supports .NET 6 and .NET 7.

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Installation

The SDK is available on Nuget and can be installed using the Package Manager Console or the dotnet CLI:

Install-Package Criipto.Signatures
dotnet add package Criipto.Signatures

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Configure the SDK

var client = new CriiptoSignaturesClient("{YOUR_CRIIPTO_CLIENT_ID}", "{YOUR_CRIIPTO_CLIENT_SECRET}");

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Creating your first signature order

Create a signature order by

using Criipto.Signatures;
using Criipto.Signatures.Models;

using (var client = new CriiptoSignaturesClient("{YOUR_CRIIPTO_CLIENT_ID}", "{YOUR_CRIIPTO_CLIENT_SECRET}")) {
    var pdfFile = File.ReadAllBytes("...some pdf file");

    // Setup document input
    var documents = new List<DocumentInput>{
        new DocumentInput {
            pdf = new PadesDocumentInput {
                title = "Dotnet Sample",
                blob = pdfFile,
                storageMode = DocumentStorageMode.Temporary
            }
        }
    };

    // Setup signature order input
    var createSignatureOrderInput = new CreateSignatureOrderInput
    {
        title = "Dotnet Sample",
        documents = documents
    };

    // Create signature order
    var signatureOrder = await client.CreateSignatureOrder(createSignatureOrderInput);

    // ... store the signatureOrder.id
}

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Adding signatories

Signatories are the individuals you wish to sign your documents.

using Criipto.Signatures;
using Criipto.Signatures.Models;

using (var client = new CriiptoSignaturesClient("{YOUR_CRIIPTO_CLIENT_ID}", "{YOUR_CRIIPTO_CLIENT_SECRET}")) {
    var signatureOrderId = "..." // The id from when you previosuly created the signature order

    // Add signatory to signature order
    var signatory = await client.AddSignatory(signatureOrderId);

    Console.WriteLine(signatory.href); // The signatory.href is the signing link that you can show or send to your users
}

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Closing the signature order

Once everyone has signed you must close the signature order to finalize the process and extract the signed documents.

using Criipto.Signatures;
using Criipto.Signatures.Models;

using (var client = new CriiptoSignaturesClient("{YOUR_CRIIPTO_CLIENT_ID}", "{YOUR_CRIIPTO_CLIENT_SECRET}")) {
    var signatureOrderId = "..." // The id from when you previosuly created the signature order

    // Close signature order
    var closedSignatureOrder = await client.CloseSignatureOrder(signatureOrderId);

    foreach (var document in closedSignatureOrder.documents)
    {
        // document.blob is a byte array containing the signed PDF
    }
}

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More examples

More .NET/C# examples are provided for all the options supported by the Criipto Signatures API.