How to get PrivateKey?

[fmoric]

How to get private key from certificate?
For example use to SignXmlText function?

I run through all codeunits and i see no way.
I wanted to make extension that has to sign an xml and send it.

So i would appreciate some help.

[SjoerddeClippelaar]

Hi Filip,

In Certificates you can upload a certificate now (with password if needed).
You can use codeunit 1259 Certificate Management to get the certificate.
Use the function VerifyCert and than use the global DotNet_X509Certificate2.

When you have the certificate you can do the following

Name	DataType	Subtype	Length
DotNetRSA	DotNet	System.Security.Cryptography.RSA.'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
DotNetRSACertificateExtensions	DotNet	System.Security.Cryptography.X509Certificates.RSACertificateExtensions.'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

DotNetRSA := DotNetRSACertificateExtensions.GetRSAPrivateKey(DotNetX509Certificate2);
CertificateXml := DotNetRSA.ToXmlString(TRUE);

CertificateXml contains the privatekey (see https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.rsa.toxmlstring?view=netframework-4.8)

[fmoric]

Ok, i get that part, but that's using DotNet DataType and DotNet is only available on-premise.
I was wondering if there is any way of using only External functions, and building extension?

I would need it for local functionality, i need to send invoices to TA.