From 8635e59a1da32e916701a008552596a16553c2c6 Mon Sep 17 00:00:00 2001
From: Tony Arcieri <bascule@gmail.com>
Date: Fri, 24 Apr 2026 09:44:54 -0600
Subject: [PATCH] pkcs8: impl `core::error::Error` for `Error`

Also populates `Error::source` where available
---
 pkcs8/src/error.rs | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/pkcs8/src/error.rs b/pkcs8/src/error.rs
index 419d621ba..eb7e5366f 100644
--- a/pkcs8/src/error.rs
+++ b/pkcs8/src/error.rs
@@ -47,8 +47,17 @@ impl fmt::Display for Error {
     }
 }
 
-#[cfg(feature = "std")]
-impl std::error::Error for Error {}
+impl core::error::Error for Error {
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
+        match self {
+            Error::Asn1(err) => Some(err),
+            #[cfg(feature = "pkcs5")]
+            Error::EncryptedPrivateKey(err) => Some(err),
+            Error::PublicKey(err) => Some(err),
+            _ => None,
+        }
+    }
+}
 
 impl From<der::Error> for Error {
     fn from(err: der::Error) -> Error {