Update the crypto submodule to a78c958

Update the crypto submodule to commit a78c958b17d75ddf63d8dd17255b6379dcbf259f
to include the equivalent changes in this PR within the submodule.
diff --git a/crypto b/crypto
index bf61ca7..a78c958 160000
--- a/crypto
+++ b/crypto
@@ -1 +1 @@
-Subproject commit bf61ca7a0429ae81adfa82d1bbee4e58e3f6ecef
+Subproject commit a78c958b17d75ddf63d8dd17255b6379dcbf259f