+int EVP_PKEY_get_attr_count(const EVP_PKEY *key);
+int EVP_PKEY_get_attr_by_NID(const EVP_PKEY *key, int nid,
+ int lastpos);
+int EVP_PKEY_get_attr_by_OBJ(const EVP_PKEY *key, ASN1_OBJECT *obj,
+ int lastpos);
+X509_ATTRIBUTE *EVP_PKEY_get_attr(const EVP_PKEY *key, int loc);
+X509_ATTRIBUTE *EVP_PKEY_delete_attr(EVP_PKEY *key, int loc);
+int EVP_PKEY_add1_attr(EVP_PKEY *key, X509_ATTRIBUTE *attr);
+int EVP_PKEY_add1_attr_by_OBJ(EVP_PKEY *key,
+ const ASN1_OBJECT *obj, int type,
+ const unsigned char *bytes, int len);
+int EVP_PKEY_add1_attr_by_NID(EVP_PKEY *key,
+ int nid, int type,
+ const unsigned char *bytes, int len);
+int EVP_PKEY_add1_attr_by_txt(EVP_PKEY *key,
+ const char *attrname, int type,
+ const unsigned char *bytes, int len);
+