Retain the custom extensions when parsing

Author: jean-airoldie

rcgen/src/csr.rs

@@ -10,7 +10,7 @@ use crate::{
 	Certificate, CertificateParams, Error, Issuer, PublicKeyData, SignatureAlgorithm, SigningKey,
 };
 #[cfg(feature = "x509-parser")]
-use crate::{DistinguishedName, SanType};
+use crate::{CustomExtension, DistinguishedName, SanType};
 #[cfg(feature = "x509-parser")]
 use x509_parser::asn1_rs::Oid;
 
@@ -208,13 +208,22 @@ impl CertificateSigningRequestParams {
 							return Err(Error::UnsupportedExtension);
 						}
 					},
-					x509_parser::extensions::ParsedExtension::UnsupportedExtension { oid, value } => {
+					x509_parser::extensions::ParsedExtension::UnsupportedExtension {
+						oid,
+						value,
+					} => {
 						valid_fn(oid, value)?;
+						let oid: Vec<u64> = match oid.iter() {
+							Some(iter) => iter.collect(),
+							None => return Err(Error::UnsupportedExtension),
+						};
+						let ext = CustomExtension::from_oid_content(&oid, value.to_vec());
+						params.custom_extensions.push(ext);
 					},
 					other => {
 						dbg!(&other);
 						return Err(Error::UnsupportedExtension);
-					}
+					},
 				}
 			}
 		}