using System;
using System.Collections.Generic; using System.Threading; namespace CreditCardNumberGenerator { public class RandomCreditCardNumberGenerator { /*This is a port of the port of of the Javascript credit card number gener ator now in C# * by Kev Hunter http://kevhunter.wordpress.com */ /* * /** * See the license below. Obviously, this is not a Javascript credit card number * generator. However, The following class is a port of a Javascript credit card * number generator. * * @author robweber * * Javascript credit card number generator Copyright (C) 2006 Graham King *
[email protected] * * This program 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 2 of the License, or (at your * option) any later version. * * This program 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 this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * www.darkcoding.net */ public static String[] AMEX_PREFIX_LIST = new[] {"34", "37"}; public static String[] DINERS_PREFIX_LIST = new[] { "300", "301", "302", "303", "36 ", "38" }; public static String[] DISCOVER_PREFIX_LIST = new[] {"6011"}; public static String[] ENROUTE_PREFIX_LIST = new[] { "2014", "2149" };
public static String[] JCB_15_PREFIX_LIST = new[] { "2100", "1800" }; public static String[] JCB_16_PREFIX_LIST = new[] { "3088", "3096", "3112", "3158", "3337", "3528" }; public static String[] MASTERCARD_PREFIX_LIST = new[] { "51", "52", "53", "54", "5 5" }; public static String[] VISA_PREFIX_LIST = new[] { "4539", "4556", "4916", "4532", "4 929", "40240071", "4485", "4716", "4" }; public static String[] VOYAGER_PREFIX_LIST = new[] {"8699"}; private static String Strrev(String str) { if (str == null) return ""; String revstr = ""; for (int i = str.Length - 1; i >= 0; i--) { revstr += str[i]; } return revstr; } /* * 'prefix' is the start of the CC number as a string, any number of digits. * 'length' is the length of the CC number to generate. Typically 13 or 16 */ private static String completed_number(String prefix, int length) { String ccnumber = prefix; // generate digits while (ccnumber.Length < (length - 1)) { double rnd = (new Random().NextDouble()*1.0f - 0f); ccnumber += Math.Floor(rnd*10); Thread.Sleep(20); } // reverse number and convert to int String reversedCCnumberString = Strrev(ccnumber); var reversedCCnumberList = new List
(); for (int i = 0; i < reversedCCnumberString.Length; i++)
{ reversedCCnumberList.Add(Convert.ToInt32(reversedCCnumberString[i].T oString())); } // calculate sum int sum = 0; int pos = 0; int[] reversedCCnumber = reversedCCnumberList .ToArray(); while (pos < length - 1) { int odd = reversedCCnumber[pos]*2; if (odd > 9) { odd -= 9; } sum += odd; if (pos != (length - 2)) { sum += reversedCCnumber[pos + 1]; } pos += 2; } // calculate check digit int checkdigit = Convert.ToInt32((Math.Floor((decimal) sum/10) + 1)*10 - sum)%10; ccnumber += checkdigit; return ccnumber; } public static String[] credit_card_number(String[] prefixList, int length, int howMany) { var result = new Stack(); for (int i = 0; i < howMany; i++) { int next = new Random().Next(0, prefixList.Length - 1); String ccnumber = prefixList[next - 1]; result.Push(completed_number(ccnumber, length)); } return result.ToArray(); } public static String[] generateMasterCardNumbers(int howMany) { return credit_card_number(MASTERCARD_PREFIX_LIST, 16, howMany); } public static String generateMasterCardNumber() { return credit_card_number(MASTERCARD_PREFIX_LIST, 16, 1)[0]; } public static string Reverse(string str) { // convert the string to char array char[] charArray = str.ToCharArray(); int len = str.Length - 1; /* now this for is a bit unconventional at first glance because there
are 2 variables that we're changing values of: i++ and len--. the order of them is irrelevant. so basicaly we're going with i from start to end of the array. with len we're shortening the array by one each time. this is probably understandable. */ for (int i = 0; i < len; i++, len--) { /* now this is the tricky part people that should know about it don't. look at the table below to see what's going on exactly here. */ charArray[i] ^= charArray[len]; charArray[len] ^= charArray[i]; charArray[i] ^= charArray[len]; } return new string(charArray); } public static bool isValidCreditCardNumber(String creditCardNumber) { bool isValid = false; try { String reversedNumber = Reverse(creditCardNumber); int mod10Count = 0; for (int i = 0; i < reversedNumber.Length; i++) { int augend = Convert.ToInt32(reversedNumber[i]); if (((i + 1)%2) == 0) { String productString = (augend*2).ToString(); augend = 0; for (int j = 0; j < productString.Length; j++) { augend += Convert.ToInt32(productString[j]); } } mod10Count += augend; } if ((mod10Count%10) == 0) { isValid = true; } } catch { } return isValid; } } }
