don't add digest alias if signature algorithm is undefined

diff --git a/crypto/evp/names.c b/crypto/evp/names.c
index e2e04c3570f461ae5e941db3de4db91a702310dd..945879dc39a6c87a4d1766bc5b701d4dc404cba4 100644 (file)
--- a/crypto/evp/names.c
+++ b/crypto/evp/names.c
@@ -90,7 +90,7 @@ int EVP_add_digest(const EVP_MD *md)
        r=OBJ_NAME_add(OBJ_nid2ln(md->type),OBJ_NAME_TYPE_MD_METH,(const char *)md);
        if (r == 0) return(0);
 
-       if (md->type != md->pkey_type)
+       if (md->pkey_type && md->type != md->pkey_type)
                {
                r=OBJ_NAME_add(OBJ_nid2sn(md->pkey_type),
                        OBJ_NAME_TYPE_MD_METH|OBJ_NAME_ALIAS,name);