1 files changed, 86 insertions, 0 deletions
diff --git a/libtomcrypt/demos/constants.c b/libtomcrypt/demos/constants.c
new file mode 100644
index 0000000..f747eb5
--- /dev/null
+++ b/libtomcrypt/demos/constants.c
@@ -0,0 +1,86 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L
+#include <libgen.h>
+#else
+#define basename(x) x
+#endif
+
+/**
+  @file demo_crypt_constants.c
+
+  Demo how to get various constants to dynamic languages
+  like Python
+
+  Larry Bugbee, February 2013
+*/
+
+static void _print_line(const char* cmd, const char* desc)
+{
+   printf("  %-16s - %s\n", cmd, desc);
+}
+
+int main(int argc, char **argv)
+{
+   if (argc == 1) {
+      /* given a specific constant name, get and print its value */
+      char name[] = "CTR_COUNTER_BIG_ENDIAN";
+      int value;
+      char *names_list;
+      unsigned int names_list_len;
+
+      if (crypt_get_constant(name, &value) != 0) exit(EXIT_FAILURE);
+      printf("\n  %s is %d \n\n", name, value);
+
+      /* get and print the length of the names (and values) list */
+
+      if (crypt_list_all_constants(NULL, &names_list_len) != 0) exit(EXIT_FAILURE);
+      printf("  need to allocate %u bytes \n\n", names_list_len);
+
+      /* get and print the names (and values) list */
+      if ((names_list = malloc(names_list_len)) == NULL) exit(EXIT_FAILURE);
+      if (crypt_list_all_constants(names_list, &names_list_len) != 0) exit(EXIT_FAILURE);
+      printf("  supported constants:\n\n%s\n\n", names_list);
+      free(names_list);
+   } else if (argc == 2) {
+      if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
+         char* base = strdup(basename(argv[0]));
+         printf("Usage: %s [-a] [-s name]\n\n", base);
+         _print_line("<no argument>", "The old behavior of the demo");
+         _print_line("-a", "Only lists all constants");
+         _print_line("-s name", "List a single constant given as argument");
+         _print_line("-h", "The help you're looking at");
+         free(base);
+      } else if (strcmp(argv[1], "-a") == 0) {
+         char *names_list;
+         unsigned int names_list_len;
+         /* get and print the length of the names (and values) list */
+         if (crypt_list_all_constants(NULL, &names_list_len) != 0) exit(EXIT_FAILURE);
+         /* get and print the names (and values) list */
+         names_list = malloc(names_list_len);
+         if (crypt_list_all_constants(names_list, &names_list_len) != 0) exit(EXIT_FAILURE);
+         printf("%s\n", names_list);
+      }
+   } else if (argc == 3) {
+      if (strcmp(argv[1], "-s") == 0) {
+         int value;
+         if (crypt_get_constant(argv[2], &value) != 0) exit(EXIT_FAILURE);
+         printf("%s,%u\n", argv[2], value);
+      }
+   }
+
+   return 0;
+}
+
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */