From 91aa84c15d988ea726998b3ccb2bff8bcea66db3 Mon Sep 17 00:00:00 2001
From: Brian Hession <github@bhmail.me>
Date: Fri, 17 Nov 2023 13:53:19 -0500
Subject: [PATCH] impl Display for builder::Error

---
 x509-ocsp/src/builder.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/x509-ocsp/src/builder.rs b/x509-ocsp/src/builder.rs
index d6f974f2c..d46389619 100644
--- a/x509-ocsp/src/builder.rs
+++ b/x509-ocsp/src/builder.rs
@@ -1,5 +1,7 @@
 //! OCSP builder module
 
+use alloc::fmt;
+
 mod request;
 mod response;
 
@@ -19,6 +21,19 @@ pub enum Error {
     Signature(signature::Error),
 }
 
+#[cfg(feature = "std")]
+impl std::error::Error for Error {}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::Asn1(err) => write!(f, "ASN.1 error: {}", err),
+            Error::PublicKey(err) => write!(f, "public key error: {}", err),
+            Error::Signature(err) => write!(f, "signature error: {}", err),
+        }
+    }
+}
+
 impl From<der::Error> for Error {
     fn from(other: der::Error) -> Self {
         Self::Asn1(other)