From 6e0b7109abb40ded327b15599b29f861d9acb3c9 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Wed, 1 Feb 2023 13:34:32 +0100
Subject: Move OpenSSL init to initLibUtil

Part of an effort to make it easier to initialize the right things,
by moving code into the appropriate libraries.
---
 src/libutil/hash.cc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'src/libutil/hash.cc')

diff --git a/src/libutil/hash.cc b/src/libutil/hash.cc
index 5735e4715..9df8bcfb4 100644
--- a/src/libutil/hash.cc
+++ b/src/libutil/hash.cc
@@ -1,6 +1,7 @@
 #include <iostream>
 #include <cstring>
 
+#include <openssl/crypto.h>
 #include <openssl/md5.h>
 #include <openssl/sha.h>
 
@@ -16,6 +17,28 @@
 
 namespace nix {
 
+#if OPENSSL_VERSION_NUMBER < 0x10101000L
+/* OpenSSL is not thread-safe by default - it will randomly crash
+   unless the user supplies a mutex locking function. So let's do
+   that. */
+static std::vector<std::mutex> opensslLocks;
+
+static void opensslLockCallback(int mode, int type, const char * file, int line)
+{
+    if (mode & CRYPTO_LOCK)
+        opensslLocks[type].lock();
+    else
+        opensslLocks[type].unlock();
+}
+#endif
+
+void initOpenSSL() {
+#if OPENSSL_VERSION_NUMBER < 0x10101000L
+    /* Initialise OpenSSL locking. */
+    opensslLocks = std::vector<std::mutex>(CRYPTO_num_locks());
+    CRYPTO_set_locking_callback(opensslLockCallback);
+#endif
+}
 
 static size_t regularHashSize(HashType type) {
     switch (type) {
-- 
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