--- /dev/null
+=pod
+
+=head1 NAME
+
+PKCS8_pkey_get0_attrs, PKCS8_pkey_add1_attr, PKCS8_pkey_add1_attr_by_NID, PKCS8_pkey_add1_attr_by_OBJ - PKCS8 attribute functions
+
+=head1 SYNOPSIS
+
+ #include <openssl/x509.h>
+
+ const STACK_OF(X509_ATTRIBUTE) *
+ PKCS8_pkey_get0_attrs(const PKCS8_PRIV_KEY_INFO *p8);
+ int PKCS8_pkey_add1_attr(PKCS8_PRIV_KEY_INFO *p8, X509_ATTRIBUTE *attr);
+ int PKCS8_pkey_add1_attr_by_NID(PKCS8_PRIV_KEY_INFO *p8, int nid, int type,
+ const unsigned char *bytes, int len);
+ int PKCS8_pkey_add1_attr_by_OBJ(PKCS8_PRIV_KEY_INFO *p8, const ASN1_OBJECT *obj,
+ int type, const unsigned char *bytes, int len);
+
+=head1 DESCRIPTION
+
+PKCS8_pkey_get0_attrs() returns a const STACK of X509_ATTRIBUTE present in
+the passed const PKCS8_PRIV_KEY_INFO structure B<p8>.
+
+PKCS8_pkey_add1_attr() adds a constructed X509_ATTRIBUTE B<attr> to the
+existing PKCS8_PRIV_KEY_INFO structure B<p8>.
+
+PKCS8_pkey_add1_attr_by_NID() and PKCS8_pkey_add1_attr_by_OBJ() construct a new
+X509_ATTRIBUTE from the passed arguments and add it to the existing
+PKCS8_PRIV_KEY_INFO structure B<p8>.
+
+=head1 RETURN VALUES
+
+PKCS8_pkey_add1_attr(), PKCS8_pkey_add1_attr_by_NID(), and
+PKCS8_pkey_add1_attr_by_OBJ() return 1 for success and 0 for failure.
+
+=head1 NOTES
+
+STACK of X509_ATTRIBUTE is present in many X509-related structures and some of
+them have the corresponding set of similar functions.
+
+=head1 SEE ALSO
+
+L<crypto(7)>
+
+=head1 COPYRIGHT
+
+Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut