crypto/sm3: Add overview documentation to the .h file.

* lib/sm3.h: Add comments.

2 files changed, 14 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index e66c144a02..ddaa32ccfb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-10-28  Bruno Haible  <bruno@clisp.org>
+
+	crypto/sm3: Add overview documentation to the .h file.
+	* lib/sm3.h: Add comments.
+
 2017-10-28  Jia Zhang  <qianyue.zj@alibaba-inc.com>
 
 	New module: crypto/sm3
diff --git a/lib/sm3.h b/lib/sm3.h
index ae07554861..a14dc52184 100644
--- a/lib/sm3.h
+++ b/lib/sm3.h
@@ -15,6 +15,15 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+/* This module can be used to compute SM3 message digest of files or
+   memory blocks according to the specification GM/T 004-2012
+   Cryptographic Hash Algorithm SM3, published by State Cryptography
+   Administration, China.
+
+   The official SM3 cryptographic hash algorithm specification is
+   available at
+   <http://www.sca.gov.cn/sca/xwdt/2010-12/17/content_1002389.shtml>. */
+
 #ifndef SM3_H
 # define SM3_H 1