shell: Add an md5 hash command for files.

This command lets you get an MD5 hash for a file in an RTEMS file system.

1 files changed, 110 insertions, 0 deletions

diff --git a/cpukit/libmisc/shell/main_md5.c b/cpukit/libmisc/shell/main_md5.c
new file mode 100644
index 0000000000..b0d1833270
--- /dev/null
+++ b/cpukit/libmisc/shell/main_md5.c
@@ -0,0 +1,110 @@
+/*
+ *  MD5 Shell Command Implmentation
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <rtems.h>
+#include <rtems/shell.h>
+
+#include <md5.h>
+
+#define BUFFER_SIZE (4 * 1024)
+
+static int rtems_shell_main_md5(
+  int   argc,
+  char *argv[])
+{
+  uint8_t* buffer;
+  uint8_t  hash[16];
+  size_t   h;
+
+  buffer = malloc(BUFFER_SIZE);
+  if (!buffer)
+  {
+    printf("error: no memory\n");
+    return 1;
+  }
+
+  --argc;
+  ++argv;
+
+  while (argc)
+  {
+    struct stat sb;
+    MD5_CTX     md5;
+    int         in;
+
+    if (stat(*argv, &sb) < 0)
+    {
+        free(buffer);
+        printf("error: stat of %s: %s\n", *argv, strerror(errno));
+        return 1;
+    }
+
+    in = open(*argv, O_RDONLY);
+    if (in < 0)
+    {
+        free(buffer);
+        printf("error: opening %s: %s\n", *argv, strerror(errno));
+        return 1;
+    }
+
+    MD5Init(&md5);
+
+    while (sb.st_size)
+    {
+      ssize_t size = sb.st_size > BUFFER_SIZE ? BUFFER_SIZE : sb.st_size;
+
+      if (read(in, buffer, size) != size)
+      {
+        close(in);
+        free(buffer);
+        printf("error: reading %s: %s\n", *argv, strerror(errno));
+        return 1;
+      }
+
+      MD5Update(&md5, buffer, size);
+
+      sb.st_size -= size;
+    }
+
+    MD5Final(hash, &md5);
+
+    close(in);
+
+    printf("MD5 (%s) = ", *argv);
+    for (h = 0; h < sizeof(hash); ++h)
+      printf("%02x", (int) hash[h]);
+    printf("\n");
+
+    --argc;
+    ++argv;
+  }
+
+  free(buffer);
+
+  return 0;
+}
+
+rtems_shell_cmd_t rtems_shell_MD5_Command = {
+  "md5",                 /* name */
+  "md5 [file ...]",      /* usage */
+  "files",               /* topic */
+  rtems_shell_main_md5,  /* command */
+  NULL,                  /* alias */
+  NULL                   /* next */
+};