add hmac-sha2 and update files

1 files changed, 31 insertions, 0 deletions

diff --git a/hmac-main.c b/hmac-main.c
new file mode 100644
index 0000000..ad65d65
--- /dev/null
+++ b/hmac-main.c
@@ -0,0 +1,31 @@
+#include <string.h> // strlen()
+#include <stdio.h> // printf()
+#include "hmac-sha2.h"
+
+static void print_hash(const uint8_t * const hash) {
+  for (size_t i = 0; i < SHA256_HASH_SIZE; i++) {
+    printf("%02x", hash[i]);
+  }
+}
+
+int main(int argc, char *argv[]) {
+  // check args
+  if (argc < 2) {
+    fprintf(stderr, "Usage: %s [key] [message]\n", argv[0]);
+    return -1;
+  }
+
+  // calculate hmac
+  uint8_t hash[SHA256_HASH_SIZE];
+  hmac_sha256(
+    (uint8_t *) argv[1], strlen(argv[1]),
+    (uint8_t *) argv[2], strlen(argv[2]),
+    hash
+  );
+
+  // print hash
+  print_hash(hash);
+  printf("\n");
+
+  return 0;
+}