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/*
This file is part of Anastasis
Copyright (C) 2020, 2021 Anastasis SARL
Anastasis is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
Anastasis; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file reducer/validation_IN_AADHAR.c
* @brief validation logic for Indian Aadhar numbers
* @author Christian Grothoff
*/
#include <string.h>
#include <stdbool.h>
#include <ctype.h>
/**
* The multiplication table.
*/
static int m[10][10] = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
{1, 2, 3, 4, 0, 6, 7, 8, 9, 5},
{2, 3, 4, 0, 1, 7, 8, 9, 5, 6},
{3, 4, 0, 1, 2, 8, 9, 5, 6, 7},
{4, 0, 1, 2, 3, 9, 5, 6, 7, 8},
{5, 9, 8, 7, 6, 0, 4, 3, 2, 1},
{6, 5, 9, 8, 7, 1, 0, 4, 3, 2},
{7, 6, 5, 9, 8, 2, 1, 0, 4, 3},
{8, 7, 6, 5, 9, 3, 2, 1, 0, 4},
{9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
};
/**
* The permutation table.
*/
static int p[10][10] = {
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
{1, 5, 7, 6, 2, 8, 3, 0, 9, 4},
{5, 8, 0, 3, 7, 9, 6, 1, 4, 2},
{8, 9, 1, 6, 0, 4, 3, 5, 2, 7},
{9, 4, 5, 3, 1, 2, 6, 8, 7, 0},
{4, 2, 8, 6, 5, 7, 3, 9, 0, 1},
{2, 7, 9, 3, 8, 0, 6, 4, 1, 5},
{7, 0, 4, 6, 9, 1, 3, 2, 5, 8}
};
/**
* Converts a string to a reversed integer array.
*
* @param input The numeric string data converted to reversed int array.
* @param[out] output array containing the digits in the numeric string
* in reverse order
*/
static bool
string_to_vals (const char *input,
int output[12])
{
unsigned int off = 0;
for (unsigned int i = 0; i < 12;)
{
int c = input[i + off];
if (0 == c)
return false;
if (isspace (c))
{
off++;
continue;
}
if (! isdigit (c))
return false;
output[11 - i++] = c - '0';
}
if ('\0' != input[12 + off])
return false;
return true;
}
/**
* Function to validate an Indian Aadhar number.
*
* See https://www.geeksforgeeks.org/how-to-check-aadhar-number-is-valid-or-not-using-regular-expression/
* and http://en.wikipedia.org/wiki/Verhoeff_algorithm/.
*
* @param aadhar_number aadhar number to validate (input)
* @return true if validation passed, else false
*/
bool
IN_AADHAR_check (const char *aadhar_number)
{
int c = 0;
int vals[12];
if (! string_to_vals (aadhar_number,
vals))
return false;
for (unsigned int i = 0; i < 12; i++)
c = m[c][p[(i % 8)][vals[i]]];
return (0 == c);
}
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