Created
June 10, 2019 03:35
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Credit Card Number Generator
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import java.util.List; | |
import java.util.Stack; | |
import java.util.Vector; | |
/** | |
* 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 | |
* | |
*/ | |
public class RandomCreditCardNumberGenerator { | |
/* | |
* Javascript credit card number generator Copyright (C) 2006-2012 Graham King | |
* | |
* 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 final String[] VISA_PREFIX_LIST = new String[] { "4539", | |
"4556", "4916", "4532", "4929", "40240071", "4485", "4716", "4" }; | |
public static final String[] MASTERCARD_PREFIX_LIST = new String[] { "51", | |
"52", "53", "54", "55", "2221", "2222", "2223", "2224", "2225", "2226", "2227", "2228", "2229", "223", "224", "225", "226", "227", "228", "229", "23", "24", "25", "26", "270", "271", "2720" }; | |
public static final String[] AMEX_PREFIX_LIST = new String[] { "34", "37" }; | |
public static final String[] DISCOVER_PREFIX_LIST = new String[] { "6011" }; | |
public static final String[] DINERS_PREFIX_LIST = new String[] { "300", | |
"301", "302", "303", "36", "38" }; | |
public static final String[] ENROUTE_PREFIX_LIST = new String[] { "2014", | |
"2149" }; | |
public static final String[] JCB_PREFIX_LIST = new String[] { "35" }; | |
public static final String[] VOYAGER_PREFIX_LIST = new String[] { "8699" }; | |
static String strrev(String str) { | |
if (str == null) | |
return ""; | |
String revstr = ""; | |
for (int i = str.length() - 1; i >= 0; i--) { | |
revstr += str.charAt(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 | |
*/ | |
static String completed_number(String prefix, int length) { | |
String ccnumber = prefix; | |
// generate digits | |
while (ccnumber.length() < (length - 1)) { | |
ccnumber += new Double(Math.floor(Math.random() * 10)).intValue(); | |
} | |
// reverse number and convert to int | |
String reversedCCnumberString = strrev(ccnumber); | |
List<Integer> reversedCCnumberList = new Vector<Integer>(); | |
for (int i = 0; i < reversedCCnumberString.length(); i++) { | |
reversedCCnumberList.add(new Integer(String | |
.valueOf(reversedCCnumberString.charAt(i)))); | |
} | |
// calculate sum | |
int sum = 0; | |
int pos = 0; | |
Integer[] reversedCCnumber = reversedCCnumberList | |
.toArray(new Integer[reversedCCnumberList.size()]); | |
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 = new Double( | |
((Math.floor(sum / 10) + 1) * 10 - sum) % 10).intValue(); | |
ccnumber += checkdigit; | |
return ccnumber; | |
} | |
public static String[] credit_card_number(String[] prefixList, int length, | |
int howMany) { | |
Stack<String> result = new Stack<String>(); | |
for (int i = 0; i < howMany; i++) { | |
int randomArrayIndex = (int) Math.floor(Math.random() | |
* prefixList.length); | |
String ccnumber = prefixList[randomArrayIndex]; | |
result.push(completed_number(ccnumber, length)); | |
} | |
return result.toArray(new String[result.size()]); | |
} | |
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 boolean isValidCreditCardNumber(String creditCardNumber) { | |
boolean isValid = false; | |
try { | |
String reversedNumber = new StringBuffer(creditCardNumber) | |
.reverse().toString(); | |
int mod10Count = 0; | |
for (int i = 0; i < reversedNumber.length(); i++) { | |
int augend = Integer.parseInt(String.valueOf(reversedNumber | |
.charAt(i))); | |
if (((i + 1) % 2) == 0) { | |
String productString = String.valueOf(augend * 2); | |
augend = 0; | |
for (int j = 0; j < productString.length(); j++) { | |
augend += Integer.parseInt(String.valueOf(productString | |
.charAt(j))); | |
} | |
} | |
mod10Count += augend; | |
} | |
if ((mod10Count % 10) == 0) { | |
isValid = true; | |
} | |
} catch (NumberFormatException e) { | |
} | |
return isValid; | |
} | |
public static void main(String[] args) { | |
int howMany = 0; | |
try { | |
howMany = Integer.parseInt(args[0]); | |
} catch (Exception e) { | |
System.err | |
.println("Usage error. You need to supply a numeric argument (ex: 500000)"); | |
} | |
String[] creditcardnumbers = generateMasterCardNumbers(howMany); | |
for (int i = 0; i < creditcardnumbers.length; i++) { | |
System.out.println(creditcardnumbers[i] | |
+ ":" | |
+ (isValidCreditCardNumber(creditcardnumbers[i]) ? "valid" | |
: "invalid")); | |
} | |
} | |
} |
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