From cdadd4cd1b1051b1c993eb245a27d0250f75fa74 Mon Sep 17 00:00:00 2001
From: Lukas Reschke <lukas@owncloud.com>
Date: Sat, 12 Mar 2016 23:11:31 +0100
Subject: [PATCH] Fallback for crappy ancient distributions

Fixes https://github.com/owncloud/core/issues/23181
---
 apps/encryption/lib/crypto/crypt.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/apps/encryption/lib/crypto/crypt.php b/apps/encryption/lib/crypto/crypt.php
index 645f1ff054..ca70c88488 100644
--- a/apps/encryption/lib/crypto/crypt.php
+++ b/apps/encryption/lib/crypto/crypt.php
@@ -266,6 +266,13 @@ class Crypt {
 			$cipher = self::DEFAULT_CIPHER;
 		}
 
+		// Workaround for OpenSSL 0.9.8. Fallback to an old cipher that should work.
+		if(OPENSSL_VERSION_NUMBER < 0x1000101f) {
+			if($cipher === 'AES-256-CTR' || $cipher === 'AES-128-CTR') {
+				$cipher = self::LEGACY_CIPHER;
+			}
+		}
+
 		return $cipher;
 	}