Provide BIO_get_new_index().

Based on BoringSSL.

1 files changed, 15 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bio/bio_lib.c b/src/lib/libcrypto/bio/bio_lib.c
index 4e5405d6af..b2acd01342 100644
--- a/src/lib/libcrypto/bio/bio_lib.c
+++ b/src/lib/libcrypto/bio/bio_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: bio_lib.c,v 1.24 2018/02/18 12:58:25 tb Exp $ */
+/* $OpenBSD: bio_lib.c,v 1.25 2018/02/20 17:15:27 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -64,6 +64,20 @@
 #include <openssl/err.h>
 #include <openssl/stack.h>
 
+int
+BIO_get_new_index(void)
+{
+        static int bio_type_index = BIO_TYPE_START;
+        int index;
+
+        /* The index will collide with the BIO flag bits if it exceeds 255. */
+        index = CRYPTO_add(&bio_type_index, 1, CRYPTO_LOCK_BIO);
+        if (index > 255)
+                return -1;
+
+        return index;
+}
+
 BIO *
 BIO_new(BIO_METHOD *method)
 {