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RSACryptoServiceProvider Extension to add FromXmlString and ToXmlString methods for ASP.NET Core
using System;
using System.Security.Cryptography;
using System.Xml;
namespace RSACryptoServiceProviderExtensions
{
public static class RSACryptoServiceProviderExtensions
{
public static void FromXmlString(this RSACryptoServiceProvider rsa, string xmlString)
{
RSAParameters parameters = new RSAParameters();
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlString);
if (xmlDoc.DocumentElement.Name.Equals("RSAKeyValue"))
{
foreach (XmlNode node in xmlDoc.DocumentElement.ChildNodes)
{
switch (node.Name)
{
case "Modulus": parameters.Modulus = Convert.FromBase64String(node.InnerText); break;
case "Exponent": parameters.Exponent = Convert.FromBase64String(node.InnerText); break;
case "P": parameters.P = Convert.FromBase64String(node.InnerText); break;
case "Q": parameters.Q = Convert.FromBase64String(node.InnerText); break;
case "DP": parameters.DP = Convert.FromBase64String(node.InnerText); break;
case "DQ": parameters.DQ = Convert.FromBase64String(node.InnerText); break;
case "InverseQ": parameters.InverseQ = Convert.FromBase64String(node.InnerText); break;
case "D": parameters.D = Convert.FromBase64String(node.InnerText); break;
}
}
} else
{
throw new Exception("Invalid XML RSA key.");
}
rsa.ImportParameters(parameters);
}
public static string ToXmlString(this RSACryptoServiceProvider rsa)
{
RSAParameters parameters = rsa.ExportParameters(true);
return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
Convert.ToBase64String(parameters.Modulus),
Convert.ToBase64String(parameters.Exponent),
Convert.ToBase64String(parameters.P),
Convert.ToBase64String(parameters.Q),
Convert.ToBase64String(parameters.DP),
Convert.ToBase64String(parameters.DQ),
Convert.ToBase64String(parameters.InverseQ),
Convert.ToBase64String(parameters.D));
}
}
}
@StefH

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commented Oct 8, 2017

The ToXmlString method could be written as:

public static string ToXmlString(this RSACryptoServiceProvider rsa, bool includePrivateParameters)
{
    RSAParameters parameters = rsa.ExportParameters(includePrivateParameters);

    . . . .  same code . . . .
@Wind010

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commented Mar 6, 2018

This would be preferable:

        public static string ToXmlString(this RSACryptoServiceProvider rsa, bool includePrivateParameters = false)
        {
            RSAParameters parameters = rsa.ExportParameters(includePrivateParameters);

            if (includePrivateParameters)
            {
                return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
                    Convert.ToBase64String(parameters.Modulus),
                    Convert.ToBase64String(parameters.Exponent),
                    Convert.ToBase64String(parameters.P),
                    Convert.ToBase64String(parameters.Q),
                    Convert.ToBase64String(parameters.DP),
                    Convert.ToBase64String(parameters.DQ),
                    Convert.ToBase64String(parameters.InverseQ),
                    Convert.ToBase64String(parameters.D));
            }

            return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
                Convert.ToBase64String(parameters.Modulus),
                Convert.ToBase64String(parameters.Exponent));
        }
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