I working on porting a small auction script I did last year in perl to
REBOL. (Along with everything else!) Of course, the completed product
will be posted to the library.
One glitch is a sub-script I borrowed from elsewhere that validates the
format of credit card numbers. I don't actually understand what it
does, but it works. ("The secret is to bang the rocks together, guys!"
- Adams)
I'd think a script like this would be a fine addition to the library in
its own right. In case someone is up for the challenge, here it is.
(And, please forgive the long attachment.)
-Ted.
# CC-Verify script for Visa, MasterCard, Amex and Novus Cards
# Written 29 June 1996 by Spider ([EMAIL PROTECTED])
# http://w3works.com
# http://www.servtech.com/public/spider
# Loosely based on a re-post of original by Melvyn Myers
# (initial author unknown) but this revision covers all 13,
# 15 and 16 digit cards using the Mod 10 algorithm.
########################################################################
######
# COPYRIGHT NOTICE
#
# Copyright 1996 Dave Paris (aka Spider) All Rights Reserved.
#
#
#
# The Validator may be used and modified free of charge by anyone so
long as #
# this copyright notice and the comments above remain intact. By using
this #
# code you agree to indemnify Dave Paris from any liability that might
#
# arise from it's use.
#
#
#
# Selling the code for this program without prior written consent is
#
# expressly forbidden. In other words, please ask first before you try
and #
# make money off of my program.
#
#
#
# Obtain permission before redistributing this software over the
Internet or #
# in any other medium. In all cases copyright and header must remain
intact.#
# This Copyright is in full effect in any country that has
International #
# Trade Agreements with the United States of America.
#
########################################################################
######
# Original downloaded from
http://www.worldwidemart.com/scripts/ccver.shtml
# Extracted "CC_Verify" sub routine and hacked slighty to work as a
standalone
# function in "any script", returning 0 or 1 for valid or not.
# Ted Husted (http://husted.com/ted) - April 1999.
sub CC_Verify {
# cardnumber, cardtype(visa,mastercard,amex,novus)
sub invalid_cc{ goto invalid_cc_exit }
$cardnumber = $_[0];
$cardtype = $_[1];
# Remove any spaces or dashes in card number
$cardnumber =~ s/ //g;
$cardnumber =~ s/-//g;
$length = length($cardnumber);
# Make sure that only numbers exist
if (!($cardnumber =~ /^[0-9]*$/)) {
&invalid_cc;
}
# Verify correct length for each card type
if ($cardtype eq "visa") { &vlen; }
if ($cardtype eq "mastercard") { &mclen; }
if ($cardtype eq "amex") { &alen; }
if ($cardtype eq "novus") { &nlen; }
sub vlen {
&invalid_cc unless (($length ==13) || ($length == 16));
}
sub mclen {
&invalid_cc unless ($length == 16);
}
sub alen {
&invalid_cc unless ($length == 15);
}
sub nlen {
&invalid_cc unless ($length == 16);
}
# Now Verify via Mod 10 for each one
if ($cardtype eq "visa") { &vver; }
if ($cardtype eq "mastercard") { &ver16; }
if ($cardtype eq "amex") { &ver15; }
if ($cardtype eq "novus") { &ver16; }
# pick one for Visa
sub vver {
if ($length == 13) { &ver13; }
if ($length == 16) { &ver16; }
}
# For 13 digit cards
sub ver13 {
$cc0 = substr($cardnumber,0,1);
$cc1 = substr($cardnumber,1,1);
$cc2 = substr($cardnumber,2,1);
$cc3 = substr($cardnumber,3,1);
$cc4 = substr($cardnumber,4,1);
$cc5 = substr($cardnumber,5,1);
$cc6 = substr($cardnumber,6,1);
$cc7 = substr($cardnumber,7,1);
$cc8 = substr($cardnumber,8,1);
$cc9 = substr($cardnumber,9,1);
$cc10 = substr($cardnumber,10,1);
$cc11 = substr($cardnumber,11,1);
$cc12 = substr($cardnumber,12,1);
$cc1a = $cc1 * 2;
$cc3a = $cc3 * 2;
$cc5a = $cc5 * 2;
$cc7a = $cc7 * 2;
$cc9a = $cc9 * 2;
$cc11a = $cc11 * 2;
if ($cc1a >= 10) {
$cc1b = substr($cc1a,0,1);
$cc1c = substr($cc1a,1,1);
$cc1 = $cc1b+$cc1c;
} else {
$cc1 = $cc1a;
}
if ($cc3a >= 10) {
$cc3b = substr($cc3a,0,1);
$cc3c = substr($cc3a,1,1);
$cc3 = $cc3b+$cc3c;
} else {
$cc3 = $cc3a;
}
if ($cc5a >= 10) {
$cc5b = substr($cc5a,0,1);
$cc5c = substr($cc5a,1,1);
$cc5 = $cc5b+$cc5c;
} else {
$cc5 = $cc5a;
}
if ($cc7a >= 10) {
$cc7b = substr($cc7a,0,1);
$cc7c = substr($cc7a,1,1);
$cc7 = $cc7b+$cc7c;
} else {
$cc7 = $cc7a;
}
if ($cc9a >= 10) {
$cc9b = substr($cc9a,0,1);
$cc9c = substr($cc9a,1,1);
$cc9 = $cc9b+$cc9c;
} else {
$cc9 = $cc9a;
}
if ($cc11a >= 10) {
$cc11b = substr($cc11a,0,1);
$cc11c = substr($cc11a,1,1);
$cc11 = $cc11b+$cc11c;
} else {
$cc11 = $cc11a;
}
$val =
$cc0+$cc1+$cc2+$cc3+$cc4+$cc5+$cc6+$cc7+$cc8+$cc9+$cc10+$cc11+$cc12;
if (substr($val,1,1) !=0 ) {
&invalid_cc;
}
}
# For 16 digit cards
sub ver16 {
$cc0 = substr($cardnumber,0,1);
$cc1 = substr($cardnumber,1,1);
$cc2 = substr($cardnumber,2,1);
$cc3 = substr($cardnumber,3,1);
$cc4 = substr($cardnumber,4,1);
$cc5 = substr($cardnumber,5,1);
$cc6 = substr($cardnumber,6,1);
$cc7 = substr($cardnumber,7,1);
$cc8 = substr($cardnumber,8,1);
$cc9 = substr($cardnumber,9,1);
$cc10 = substr($cardnumber,10,1);
$cc11 = substr($cardnumber,11,1);
$cc12 = substr($cardnumber,12,1);
$cc13 = substr($cardnumber,13,1);
$cc14 = substr($cardnumber,14,1);
$cc15 = substr($cardnumber,15,1);
$cc0a = $cc0 * 2;
$cc2a = $cc2 * 2;
$cc4a = $cc4 * 2;
$cc6a = $cc6 * 2;
$cc8a = $cc8 * 2;
$cc10a = $cc10 * 2;
$cc12a = $cc12 * 2;
$cc14a = $cc14 * 2;
if ($cc0a >= 10) {
$cc0b = substr($cc0a,0,1);
$cc0c = substr($cc0a,1,1);
$cc0 = $cc0b+$cc0c;
} else {
$cc0 = $cc0a;
}
if ($cc2a >= 10) {
$cc2b = substr($cc2a,0,1);
$cc2c = substr($cc2a,1,1);
$cc2 = $cc2b+$cc2c;
} else {
$cc2 = $cc2a;
}
if ($cc4a >= 10) {
$cc4b = substr($cc4a,0,1);
$cc4c = substr($cc4a,1,1);
$cc4 = $cc4b+$cc4c;
} else {
$cc4 = $cc4a;
}
if ($cc6a >= 10) {
$cc6b = substr($cc6a,0,1);
$cc6c = substr($cc6a,1,1);
$cc6 = $cc6b+$cc6c;
} else {
$cc6 = $cc6a;
}
if ($cc8a >= 10) {
$cc8b = substr($cc8a,0,1);
$cc8c = substr($cc8a,1,1);
$cc8 = $cc8b+$cc8c;
} else {
$cc8 = $cc8a;
}
if ($cc10a >= 10) {
$cc10b = substr($cc10a,0,1);
$cc10c = substr($cc10a,1,1);
$cc10 = $cc10b+$cc10c;
} else {
$cc10 = $cc10a;
}
if ($cc12a >= 10) {
$cc12b = substr($cc12a,0,1);
$cc12c = substr($cc12a,1,1);
$cc12 = $cc12b+$cc12c;
} else {
$cc12 = $cc12a;
}
if ($cc14a >= 10) {
$cc14b = substr($cc14a,0,1);
$cc14c = substr($cc14a,1,1);
$cc14 = $cc14b+$cc14c;
} else {
$cc14 = $cc14a;
}
$val =
$cc0+$cc1+$cc2+$cc3+$cc4+$cc5+$cc6+$cc7+$cc8+$cc9+$cc10+$cc11+$cc12+$cc1
3+$cc14+$cc15;
if (substr($val,1,1) !=0 ) {
&invalid_cc;
}
}
# For 15 digit (Amex) cards
sub ver15 {
$cc0 = substr($cardnumber,0,1);
$cc1 = substr($cardnumber,1,1);
$cc2 = substr($cardnumber,2,1);
$cc3 = substr($cardnumber,3,1);
$cc4 = substr($cardnumber,4,1);
$cc5 = substr($cardnumber,5,1);
$cc6 = substr($cardnumber,6,1);
$cc7 = substr($cardnumber,7,1);
$cc8 = substr($cardnumber,8,1);
$cc9 = substr($cardnumber,9,1);
$cc10 = substr($cardnumber,10,1);
$cc11 = substr($cardnumber,11,1);
$cc12 = substr($cardnumber,12,1);
$cc13 = substr($cardnumber,13,1);
$cc14 = substr($cardnumber,14,1);
$cc1a = $cc1 * 2;
$cc3a = $cc3 * 2;
$cc5a = $cc5 * 2;
$cc7a = $cc7 * 2;
$cc9a = $cc9 * 2;
$cc11a = $cc11 * 2;
$cc13a = $cc13 * 2;
if ($cc1a >= 10) {
$cc1b = substr($cc1a,0,1);
$cc1c = substr($cc1a,1,1);
$cc1 = $cc1b+$cc1c;
} else {
$cc1 = $cc1a;
}
if ($cc3a >= 10) {
$cc3b = substr($cc3a,0,1);
$cc3c = substr($cc3a,1,1);
$cc3 = $cc3b+$cc3c;
} else {
$cc3 = $cc3a;
}
if ($cc5a >= 10) {
$cc5b = substr($cc5a,0,1);
$cc5c = substr($cc5a,1,1);
$cc5 = $cc5b+$cc5c;
} else {
$cc5 = $cc5a;
}
if ($cc7a >= 10) {
$cc7b = substr($cc7a,0,1);
$cc7c = substr($cc7a,1,1);
$cc7 = $cc7b+$cc7c;
} else {
$cc7 = $cc7a;
}
if ($cc9a >= 10) {
$cc9b = substr($cc9a,0,1);
$cc9c = substr($cc9a,1,1);
$cc9 = $cc9b+$cc9c;
} else {
$cc9 = $cc9a;
}
if ($cc11a >= 10) {
$cc11b = substr($cc11a,0,1);
$cc11c = substr($cc11a,1,1);
$cc11 = $cc11b+$cc11c;
} else {
$cc11 = $cc11a;
}
if ($cc13a >= 10) {
$cc13b = substr($cc13a,0,1);
$cc13c = substr($cc13a,1,1);
$cc13 = $cc13b+$cc13c;
} else {
$cc13 = $cc13a;
}
$val =
$cc0+$cc1+$cc2+$cc3+$cc4+$cc5+$cc6+$cc7+$cc8+$cc9+$cc10+$cc11+$cc12+$cc1
3+$cc14;
if (substr($val,1,1) !=0 ) {
&invalid_cc;
}
}
return 0;
invalid_cc_exit: return 1
}
### END.
