DSACertificateExtensions.cs

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using System.Runtime.Versioning;
using Internal.Cryptography;
using Internal.Cryptography.Pal;
 
namespace System.Security.Cryptography.X509Certificates;
 
[UnsupportedOSPlatform("ios")]
[UnsupportedOSPlatform("tvos")]
public static class DSACertificateExtensions
{
    public static DSA? GetDSAPublicKey(this X509Certificate2 certificate)
    {
        return certificate.GetPublicKey<DSA>();
    }
 
    public static DSA? GetDSAPrivateKey(this X509Certificate2 certificate)
    {
        return certificate.GetPrivateKey<DSA>();
    }
 
    public static X509Certificate2 CopyWithPrivateKey(this X509Certificate2 certificate, DSA privateKey)
    {
        if (certificate == null)
        {
            throw new ArgumentNullException("certificate");
        }
        if (privateKey == null)
        {
            throw new ArgumentNullException("privateKey");
        }
        if (certificate.HasPrivateKey)
        {
            throw new InvalidOperationException(System.SR.Cryptography_Cert_AlreadyHasPrivateKey);
        }
        using (DSA dSA = certificate.GetDSAPublicKey())
        {
            if (dSA == null)
            {
                throw new ArgumentException(System.SR.Cryptography_PrivateKey_WrongAlgorithm);
            }
            DSAParameters dSAParameters = dSA.ExportParameters(includePrivateParameters: false);
            DSAParameters dSAParameters2 = privateKey.ExportParameters(includePrivateParameters: false);
            if (!dSAParameters.G.ContentsEqual(dSAParameters2.G) || !dSAParameters.P.ContentsEqual(dSAParameters2.P) || !dSAParameters.Q.ContentsEqual(dSAParameters2.Q) || !dSAParameters.Y.ContentsEqual(dSAParameters2.Y))
            {
                throw new ArgumentException(System.SR.Cryptography_PrivateKey_DoesNotMatch, "privateKey");
            }
        }
        ICertificatePal pal = certificate.Pal.CopyWithPrivateKey(privateKey);
        return new X509Certificate2(pal);
    }
}