1 files changed, 17 insertions, 0 deletions

diff --git a/src/lib/libcrypto/evp/bio_md.c b/src/lib/libcrypto/evp/bio_md.c
index 317167f9c4..aef928dd8f 100644
--- a/src/lib/libcrypto/evp/bio_md.c
+++ b/src/lib/libcrypto/evp/bio_md.c
@@ -72,6 +72,8 @@ static int md_gets(BIO *h,char *str,int size);
 static long md_ctrl(BIO *h,int cmd,long arg1,char *arg2);
 static int md_new(BIO *h);
 static int md_free(BIO *data);
+static long md_callback_ctrl(BIO *h,int cmd,void (*fp)());
+
 static BIO_METHOD methods_md=
         {
         BIO_TYPE_MD,"message digest",
@@ -82,6 +84,7 @@ static BIO_METHOD methods_md=
         md_ctrl,
         md_new,
         md_free,
+        md_callback_ctrl,
         };
 
 BIO_METHOD *BIO_f_md(void)
@@ -220,6 +223,20 @@ static long md_ctrl(BIO *b, int cmd, long num, char *ptr)
         return(ret);
         }
 
+static long md_callback_ctrl(BIO *b, int cmd, void (*fp)())
+        {
+        long ret=1;
+
+        if (b->next_bio == NULL) return(0);
+        switch (cmd)
+                {
+        default:
+                ret=BIO_callback_ctrl(b->next_bio,cmd,fp);
+                break;
+                }
+        return(ret);
+        }
+
 static int md_gets(BIO *bp, char *buf, int size)
         {
         EVP_MD_CTX *ctx;