Calculates Verhoeff checksum

 @example
   Sjekksum::Verhoeff.of(142857) #=> 0

 @param  number [Integer, String] number for which the checksum should be calculated

 @return [Integer] calculated checksum
768321
def of number
      raise_on_type_mismatch number
      digits = convert_number_to_digits(number)

      INVERSE[digits.reverse_each.with_index.reduce(0) { |check, (digit, idx)|
        d_row = DIHEDRAL_GROUP_D5[check]
        d_row[ PERMUTATION[idx.next % 8][digit] ]
      }]
    end
1331632
protected function _isValidNumer($number)
    {
        $valid = false;
        if (($length = strlen($number))) {
            $modSum = 0;
            $mod = $length % 2;

            // Luhn algorithm
            for ($pos = 0; $pos < $length; $pos++) {
                // taking digit to check..
                $currDigit = ( int ) $number{$pos};

                // multiplying if needed..
                $addValue = (($pos % 2 == $mod) ? 2 : 1) * $currDigit;

                // adding prepared current digit
                $modSum += ($addValue > 9) ? $addValue - 9 : $addValue;
            }

            $valid = ($modSum % 10) == 0;
        }

        return $valid;
    }
1231028
private static String calculateChecksum(String string) {
        byte[] bytes = string.getBytes(UTF_8);
        Checksum checksum = new CRC32();
        checksum.update(bytes, 0, bytes.length);
        return Long.toHexString(checksum.getValue()).toUpperCase();
    }
29334
private static byte calculateChecksum(byte[] buffer) {
		byte checkSum = (byte)0xFF;
		for (int i=1; i<buffer.length-1; i++) {
			checkSum = (byte) (checkSum ^ buffer[i]);
		}
		logger.trace(String.format("Calculated checksum = 0x%02X", checkSum));
		return checkSum;
	}
1159174
public static int calculateMod10CheckSum(int[] weights, StringNumber number) {
       int c = calculateChecksum(weights, number, true) % 10;
       return c == 0 ? 0 : 10 - c;
    }
1254551
def calc_sha(self, checksum):
        
        with LogTask('Calculating {}'.format(checksum)):
            with open(self.dst + '.hash', 'wt') as f:
                sha = utils.get_hash(self.dst, checksum)
                f.write(sha)
            self.exported_metadata[checksum] = sha
1157387
def calculate_checksum(file)
      @lookup_checksums[file] = Digest::MD5.hexdigest(File.read(file, mode: "rb")) rescue ""
    end
1244275
def _calc_checksum(self, secret):
        
        return str_to_uascii(
            hashlib.sha256(mysql_aes_encrypt(self.salt, secret)).hexdigest()
        )
1146355
def luhn_validate(number):
    

    sum = 0
    parity = len(number) % 2
    for i, digit in enumerate([int(x) for x in number]):
        if i % 2 == parity:
            digit *= 2
            if digit > 9:
                digit -= 9
        sum += digit
    return sum % 10 == 0
754472
def checksum(string):
    
    digits = list(map(int, string))
    odd_sum = sum(digits[-1::-2])
    even_sum = sum([sum(divmod(2 * d, 10)) for d in digits[-2::-2]])
    return (odd_sum + even_sum) % 10
1070442
private static int computeChecksum(byte[] buf, int offset, int length, String channel) {
        Hasher hasher = Hashing.murmur3_32().newHasher();
        hasher.putBytes(buf, offset, length);
        hasher.putUnencodedChars(channel);
        return hasher.hash().asInt() & 0xffff;
    }
273011
def luhn_checksum(num: str) -> str:
    
    check = 0
    for i, s in enumerate(reversed(num)):
        sx = int(s)
        sx = sx * 2 if i % 2 == 0 else sx
        sx = sx - 9 if sx > 9 else sx
        check += sx
    return str(check * 9 % 10)
901830
def asnum(number, limit=None, return_format=None):
    
    uri = 'asnum/{number}'.format(number=number)
    if limit:
        uri = '/'.join([uri, str(limit)])
    return _get(uri, return_format)
311634
def luhn_check(number)
      multiplications = []

      number.split(//).each_with_index do |digit, i|
        if i % 2 == 0
          multiplications << digit.to_i * 2
        else
          multiplications << digit.to_i
        end
      end

      sum = 0
      multiplications.each do |num|
        num.to_s.each_byte do |character|
          sum += character.chr.to_i
        end
      end

      if sum % 10 == 0
        control_digit = 0
      else
        control_digit = (sum / 10 + 1) * 10 - sum
      end

      control_digit.to_s
    end
1369878
def sd
      return 0.0 if num < 2

      # (sqrt( ((s).sumsq - ( (s).sum * (s).sum / (s).num)) / ((s).num-1) ))
      begin
        return Math.sqrt( (sumsq - ( sum * sum / num)) / (num-1) )
      rescue Errno::EDOM
        return 0.0
      end
    end
1199668
private int getPositiveInteger(String number) {
    try {
      return Math.max(0, Integer.parseInt(number));
    } catch (NumberFormatException e) {
      return 0;
    }
  }
439622
def validate(number)
      criterii = {}
      criterii[:luhn] = Check.luhn number
      criterii[:type] = !!infos(number)

      valid = criterii.all? { |_, v| v == true }

      {
        valid: valid,
        details: criterii
      }
    end