Line data    Source code

       1             : /**
       2             :  * The MIT License (MIT)
       3             :  *
       4             :  * Copyright (c) 2021 RSK Labs Ltd
       5             :  *
       6             :  * Permission is hereby granted, free of charge, to any person obtaining a copy
       7             :  * of this software and associated documentation files (the "Software"), to
       8             :  * deal in the Software without restriction, including without limitation the
       9             :  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      10             :  * sell copies of the Software, and to permit persons to whom the Software is
      11             :  * furnished to do so, subject to the following conditions:
      12             :  *
      13             :  * The above copyright notice and this permission notice shall be included in
      14             :  * all copies or substantial portions of the Software.
      15             :  *
      16             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      17             :  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      18             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
      19             :  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      20             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      21             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
      22             :  * IN THE SOFTWARE.
      23             :  */
      24             : 
      25             : #include "pin_policy.h"
      26             : 
      27             : // Helper macros for pin validation
      28             : #define IS_IN_RANGE(c, begin, end) (((c) >= (begin)) && ((c) <= (end)))
      29             : #define IS_ALPHA(c) (IS_IN_RANGE(c, 'a', 'z') || IS_IN_RANGE(c, 'A', 'Z'))
      30             : #define IS_NUM(c) IS_IN_RANGE(c, '0', '9')
      31             : #define IS_ALPHANUM(c) (IS_ALPHA(c) || IS_NUM(c))
      32             : 
      33          45 : bool pin_policy_is_valid_pin(const char* pin, size_t pin_length) {
      34             :     // Pin should be exactly MAX_PIN_LENGTH characters long
      35          45 :     if (pin_length != MAX_PIN_LENGTH) {
      36          23 :         return false;
      37             :     }
      38             : 
      39             :     // Pin should:
      40             :     // - Be entirely alphanumeric and;
      41             :     // - Contain at least one alphabetic character
      42          22 :     bool hasAlpha = false;
      43         182 :     for (size_t i = 0; i < pin_length; i++) {
      44         162 :         if (!IS_ALPHANUM(pin[i])) {
      45           2 :             return false;
      46             :         }
      47         160 :         hasAlpha |= IS_ALPHA(pin[i]);
      48             :     }
      49             : 
      50          20 :     return hasAlpha;
      51             : }