如何从X509Certificate2获取RFC-1779中的颁发者名称？

Question

The Issuer property from X509Certificate2 returns a string such as:

"CN=eBusiness Development CA, OU=ITSB eBusiness Systems Team, O=AVANO, L=Sydney, S=NSW, C=AU"

How do I get the same in RFC-1779? For example:

"/C=AU/ST=NSW/L=Sydney/O=AVANO/OU=ITSB eBusiness Systems Team/CN=eBusiness Development CA"

var cert = new X509Certificate2(certPath, password);
Console.WriteLine(cert.Issuer);

Answer 1

The string you're wanting is just the reverse of the string you're actually getting from Issuer , and is delimited by slashes instead of commas with a following space.

My first attempt to solve this problem was to create a new X500DistinguishedName object, passing the certificate's IssuerName and X500DistinguishedNameFlags.Reversed to the constructor:

var distinguishedName = new X500DistinguishedName(cert.Issuer, X500DistinguishedNameFlags.Reversed);

But that didn't provide me with the result I was hoping for. I'm not sure of any baked in way to do this. But you could try reformatting the string manually to meet your needs:

var split = cert.Issuer.Split(new []{',', ' '}, StringSplitOptions.RemoveEmptyEntries);
var reversed = split.Reverse();
var finalIssuerName = string.Join("/", reversed);