From 6b5b9490f3b0a6a5a22d82ad1b887357bcb0ad9a Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Date: Sat, 30 Apr 2022 18:17:28 +0200
Subject: [PATCH] sys/shell: add sha256sum command

---
 makefiles/pseudomodules.inc.mk      |  1 +
 sys/shell/commands/sc_vfs.c         | 27 +++++++++++++++++++++++++++
 sys/shell/commands/shell_commands.c |  7 +++++++
 3 files changed, 35 insertions(+)

diff --git a/makefiles/pseudomodules.inc.mk b/makefiles/pseudomodules.inc.mk
index 4d951b07946a7..e8f2ccc8eeb1a 100644
--- a/makefiles/pseudomodules.inc.mk
+++ b/makefiles/pseudomodules.inc.mk
@@ -199,6 +199,7 @@ PSEUDOMODULES += senml_cbor
 PSEUDOMODULES += senml_phydat
 PSEUDOMODULES += senml_saul
 PSEUDOMODULES += sha1sum
+PSEUDOMODULES += sha256sum
 PSEUDOMODULES += shell_hooks
 PSEUDOMODULES += slipdev_stdio
 PSEUDOMODULES += slipdev_l2addr
diff --git a/sys/shell/commands/sc_vfs.c b/sys/shell/commands/sc_vfs.c
index 9d7029341679c..aef82cabbc031 100644
--- a/sys/shell/commands/sc_vfs.c
+++ b/sys/shell/commands/sc_vfs.c
@@ -699,4 +699,31 @@ int _vfs_sha1sum_cmd(int argc, char **argv)
     return 0;
 }
 #endif
+
+#if MODULE_SHA256SUM
+#include "hashes/sha256.h"
+int _vfs_sha256sum_cmd(int argc, char **argv)
+{
+    int res;
+    uint8_t digest[SHA256_DIGEST_LENGTH];
+
+    if (argc < 2) {
+        printf("usage: %s [file] …\n", argv[0]);
+        return -1;
+    }
+
+    for (int i = 1; i < argc; ++i) {
+        const char *file = argv[i];
+        res = vfs_file_sha256(file, digest,
+                              _shell_vfs_data_buffer, sizeof(_shell_vfs_data_buffer));
+        if (res < 0) {
+            printf("%s: error %d\n", file, res);
+        } else {
+            _print_digest(digest, sizeof(digest), file);
+        }
+    }
+
+    return 0;
+}
+#endif
 #endif
diff --git a/sys/shell/commands/shell_commands.c b/sys/shell/commands/shell_commands.c
index 9161391b754ac..1b82f5aeebb4b 100644
--- a/sys/shell/commands/shell_commands.c
+++ b/sys/shell/commands/shell_commands.c
@@ -223,6 +223,10 @@ extern int _vfs_md5sum_cmd(int argc, char **argv);
 extern int _vfs_sha1sum_cmd(int argc, char **argv);
 #endif
 
+#ifdef MODULE_SHA256SUM
+extern int _vfs_sha256sum_cmd(int argc, char **argv);
+#endif
+
 const shell_command_t _shell_command_list[] = {
     {"reboot", "Reboot the node", _reboot_handler},
     {"version", "Prints current RIOT_VERSION", _version_handler},
@@ -282,6 +286,9 @@ const shell_command_t _shell_command_list[] = {
 #ifdef MODULE_SHA1SUM
     {"sha1sum", "Compute and check SHA1 message digest", _vfs_sha1sum_cmd},
 #endif
+#ifdef MODULE_SHA256SUM
+    {"sha256sum", "Compute and check SHA256 message digest", _vfs_sha256sum_cmd},
+#endif
 #ifdef MODULE_GNRC_IPV6_NIB
     {"nib", "Configure neighbor information base", _gnrc_ipv6_nib},
 #endif