From a7066c2a8c5444921aae7820b4371244df5dfb48 Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Tue, 28 Jul 2020 17:59:04 -0400
Subject: [PATCH] Work around upstream base64 bug

Closes #1325
---
 openssl/src/base64.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/openssl/src/base64.rs b/openssl/src/base64.rs
index 59d2103a..072df6b2 100644
--- a/openssl/src/base64.rs
+++ b/openssl/src/base64.rs
@@ -43,6 +43,11 @@ pub fn encode_block(src: &[u8]) -> String {
 pub fn decode_block(src: &str) -> Result<Vec<u8>, ErrorStack> {
     let src = src.trim();
 
+    // https://github.com/openssl/openssl/issues/12143
+    if src.is_empty() {
+        return Ok(vec![]);
+    }
+
     assert!(src.len() <= c_int::max_value() as usize);
     let src_len = src.len() as c_int;