add missing doc of X509_REQ_get_extensions() and X509_REQ_add_extensions{,_nid}()

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: David von Oheimb <david.von.oheimb@siemens.com>
(Merged from https://github.com/openssl/openssl/pull/18931)

3 files changed, 56 insertions, 3 deletions

diff --git a/doc/build.info b/doc/build.info
index c029f798ef..f6d9355ef8 100644
--- a/doc/build.info
+++ b/doc/build.info
@@ -2675,6 +2675,10 @@ DEPEND[html/man3/X509_PUBKEY_new.html]=man3/X509_PUBKEY_new.pod
 GENERATE[html/man3/X509_PUBKEY_new.html]=man3/X509_PUBKEY_new.pod
 DEPEND[man/man3/X509_PUBKEY_new.3]=man3/X509_PUBKEY_new.pod
 GENERATE[man/man3/X509_PUBKEY_new.3]=man3/X509_PUBKEY_new.pod
+DEPEND[html/man3/X509_REQ_get_extensions.html]=man3/X509_REQ_get_extensions.pod
+GENERATE[html/man3/X509_REQ_get_extensions.html]=man3/X509_REQ_get_extensions.pod
+DEPEND[man/man3/X509_REQ_get_extensions.3]=man3/X509_REQ_get_extensions.pod
+GENERATE[man/man3/X509_REQ_get_extensions.3]=man3/X509_REQ_get_extensions.pod
 DEPEND[html/man3/X509_SIG_get0.html]=man3/X509_SIG_get0.pod
 GENERATE[html/man3/X509_SIG_get0.html]=man3/X509_SIG_get0.pod
 DEPEND[man/man3/X509_SIG_get0.3]=man3/X509_SIG_get0.pod
@@ -3412,6 +3416,7 @@ html/man3/X509_NAME_get0_der.html \
 html/man3/X509_NAME_get_index_by_NID.html \
 html/man3/X509_NAME_print_ex.html \
 html/man3/X509_PUBKEY_new.html \
+html/man3/X509_REQ_get_extensions.html \
 html/man3/X509_SIG_get0.html \
 html/man3/X509_STORE_CTX_get_by_subject.html \
 html/man3/X509_STORE_CTX_get_error.html \
@@ -4010,6 +4015,7 @@ man/man3/X509_NAME_get0_der.3 \
 man/man3/X509_NAME_get_index_by_NID.3 \
 man/man3/X509_NAME_print_ex.3 \
 man/man3/X509_PUBKEY_new.3 \
+man/man3/X509_REQ_get_extensions.3 \
 man/man3/X509_SIG_get0.3 \
 man/man3/X509_STORE_CTX_get_by_subject.3 \
 man/man3/X509_STORE_CTX_get_error.3 \
diff --git a/doc/man3/X509_REQ_get_extensions.pod b/doc/man3/X509_REQ_get_extensions.pod
new file mode 100644
index 0000000000..7a3932c3d6
--- /dev/null
+++ b/doc/man3/X509_REQ_get_extensions.pod
@@ -0,0 +1,50 @@
+=pod
+
+=head1 NAME
+
+X509_REQ_get_extensions,
+X509_REQ_add_extensions, X509_REQ_add_extensions_nid
+- handle X.509 extension attributes of a CSR
+
+=head1 SYNOPSIS
+
+ #include <openssl/x509.h>
+
+ STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(X509_REQ *req);
+ int X509_REQ_add_extensions(X509_REQ *req, const STACK_OF(X509_EXTENSION) *exts);
+ int X509_REQ_add_extensions_nid(X509_REQ *req,
+                                 const STACK_OF(X509_EXTENSION) *exts, int nid);
+
+=head1 DESCRIPTION
+
+X509_REQ_get_extensions() returns the first list of X.509 extensions
+found in the attributes of I<req>.
+The returned list is empty if there are no such extensions in I<req>.
+The caller is responsible for freeing the list obtained.
+
+X509_REQ_add_extensions() adds to I<req> a list of X.509 extensions I<exts>,
+which must not be NULL, using the default B<NID_ext_req>.
+This function must not be called more than once on the same I<req>.
+
+X509_REQ_add_extensions_nid() is like X509_REQ_add_extensions()
+except that I<nid> is used to identify the extensions attribute.
+This function must not be called more than once with the same I<req> and I<nid>.
+
+=head1 RETURN VALUES
+
+X509_REQ_get_extensions() returns a pointer to B<STACK_OF(X509_EXTENSION)>
+or NULL on error.
+
+X509_REQ_add_extensions() and X509_REQ_add_extensions_nid()
+return 1 on success, 0 on error.
+
+=head1 COPYRIGHT
+
+Copyright 2022 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
diff --git a/util/missingcrypto.txt b/util/missingcrypto.txt
index af8a57fa2c..94c916b185 100644
--- a/util/missingcrypto.txt
+++ b/util/missingcrypto.txt
@@ -1244,8 +1244,6 @@ X509_REQ_add1_attr(3)
 X509_REQ_add1_attr_by_NID(3)
 X509_REQ_add1_attr_by_OBJ(3)
 X509_REQ_add1_attr_by_txt(3)
-X509_REQ_add_extensions(3)
-X509_REQ_add_extensions_nid(3)
 X509_REQ_delete_attr(3)
 X509_REQ_extension_nid(3)
 X509_REQ_get1_email(3)
@@ -1254,7 +1252,6 @@ X509_REQ_get_attr_by_NID(3)
 X509_REQ_get_attr_by_OBJ(3)
 X509_REQ_get_attr_count(3)
 X509_REQ_get_extension_nids(3)
-X509_REQ_get_extensions(3)
 X509_REQ_it(3)
 X509_REQ_print(3)
 X509_REQ_print_ex(3)