Add mbedtls dependency

src/ex07/main.c

@@ -0,0 +1,47 @@
+#include "utils.h"
+#include <ctype.h>
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include "mbedtls/aes.h"
+
+#define BUF_SIZE 4096
+
+int main(int argc, char *argv[]) {
+  if (argc < 3) {
+    printf("Usage: %s <key> <filename>\n", argv[0]);
+    return EXIT_FAILURE;
+  }
+
+  const char *key = argv[1];
+  const char *filename = argv[2];
+
+  FILE *fp = fopen(filename, "r");
+  if (fp == NULL) {
+    printf("Error opening file %s\n", filename);
+    return EXIT_FAILURE;
+  }
+
+  char input[BUF_SIZE] = {'\0'};
+  size_t nread = fread(input, 1, BUF_SIZE, fp);
+  if (nread == 0) {
+    printf("Cannot read any character from file %s\n", filename);
+    return EXIT_FAILURE;
+  }
+
+  unsigned char buf[BUF_SIZE] = {0};
+  size_t len = base64_to_bytes(buf, input);
+  if (len == 0) {
+    printf("Could not decode base64\n");
+    return EXIT_FAILURE;
+  }
+
+  mbedtls_aes_context aes;
+
+  if (fclose(fp)) {
+    printf("Error closing file %s\n", filename);
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}