done adding passwords, some refactor

utils.c

@@ -8,8 +8,8 @@ void red_print_chars(uint8_t *c) {
     dprintf("\n");
 };
 
-void red_print_int(uint8_t *c) {
-    for (uint8_t i = 0; i < 32; i++) {
+void red_print_int(uint8_t *c, uint8_t len) {
+    for (uint8_t i = 0; i < len; i++) {
         dprintf("%d", c[i]);
     }
     dprintf("\n");
@@ -35,6 +35,51 @@ void red_send_chars_pass(uint8_t *out) {
     }
 };
 
+uint8_t *red_init_array(uint8_t len, uint8_t val) {
+    uint8_t *arr = (uint8_t *)malloc(sizeof(uint8_t) * len);
+    for (uint8_t i = 0; i < len; i++) {
+        arr[i] = val;
+    }
+    return arr;
+}
+
+uint8_t **red_init_array_2d(uint8_t len_row, uint8_t len_col, uint8_t val) {
+    uint8_t **arr = (uint8_t **)malloc(sizeof(uint8_t *) * len_row);
+    for (uint8_t i = 0; i < len_row; i++) {
+        arr[i] = (uint8_t *)malloc(sizeof(uint8_t) * len_col);
+        for (uint8_t j = 0; j < len_col; j++) {
+            arr[i][j] = val;
+        }
+    }
+    return arr;
+}
+
+// count printable symbols of ASCII in string with safety check of max length
+uint8_t red_strlen_printable(uint8_t *str_printable, uint8_t max_len) {
+    uint8_t result = 0;
+    while (result < max_len && *str_printable != '\0') {
+        result++;
+        str_printable++;
+    }
+    return result;
+}
+
+#ifdef USE_SHA256_KEY
+// hashing string to 32byte with sha256
+uint8_t *hashing_string(uint8_t *str_to_hash) {
+    SHA256_CTX ctx;
+    sha256_init(&ctx);
+    sha256_update(&ctx, str_to_hash, red_strlen_printable(str_to_hash, MAX_KEY_LEN));
+    // BYTE result_key[SHA256_BLOCK_SIZE];
+    BYTE *result_key = red_init_array(SHA256_BLOCK_SIZE, 0x00);
+    sha256_final(&ctx, result_key);
+#    ifdef USE_RED_CRY_DEBUG
+    red_print_hex(result_key);
+#    endif
+    return result_key;
+}
+#endif
+
 // EEPROM utils
 
 void red_write_to_storage(void) {