V_ret_string || 'American Express Credit Card Number.'
V_ret_string := v_ret_string || 'MasterCard Credit Card Number.' ĮLSIF SUBSTR (cc_number, 1, 2) = 34 OR SUBSTR (cc_number, 1, 2) = 37 /* check if amex card */ V_ret_string := v_ret_string || 'Visa Credit Card Number.' ĮLSIF SUBSTR (cc_number, 1, 2) BETWEEN 51 AND 55 /* check if master card*/ IF LENGTH (cc_number) = 13 OR LENGTH (cc_number) = 16 IF SUBSTR (cc_number, 1, 1) = '4' /* check if it is a Visa card */ * Credit card number is valid now check for its type */ V_ret_string := 'Not a valid Credit Card Number.' * Credit card number is invalid if below funciton returns non zero value */ Add the sum to the sum of the digits that weren’t multiplied by 2.
#Credit card validator luhn java github mod#
+ MOD (i + 1, 2) * SIGN (-SIGN (n_ntoi - 4) + 1) * (2 * n_ntoi) According to Luhn’s algorithm, you can determine if a credit card number is (syntactically) valid as follows: Multiply every other digit by 2, starting with the number’s second-to-last digit, and then add those products’ digits together. N_ntoi := TO_NUMBER (SUBSTR (p_ccnumber, n_ntoc + 1 - i, 1)) CREATE OR REPLACE FUNCTION validate_CC (cc_number IN VARCHAR2)įUNCTION check_luhn_algo (p_ccnumber VARCHAR2)
whereas the Luhn Mod-10 Check-Digit Validator uses the standard Luhn. Function CHECK_LUHN_ALGO to check the number using Luhn algorithm is written inside the function VALIDATE_CC, so if you want to add the more card types support then no need to change the CHECK_LUHN_ALGO function, change only the main part of the VALIDATE_CC function. For example, its the algorithm used by credit card companies to generate the final. You can modify to add more Credit Card types. Currently, this PL/SQL function supports three kinds of the Credit Cards which are Visa, MasterCard, and American Express. The following function takes an argument as Credit Card number and then validates the number using Luhn algorithm and returns its type. ".PL/SQL Function Example to Validate Credit Card Number and Its Type in Oracle ( SimCardUtils::isValidSim( $iccid )? "valid" : "invalid" ). Step 3 Add all the single digit number obtained from Step 1. Return ( false != preg_match($pattern, $sim_id) & self::isValidLuhn( $sim_id ) ) Step 2 Starting from right to left of the card number add all the digits at the odd places. check to see if the pattern is valid followed by the Luhn checksum
#Credit card validator luhn java github code#
In my code I first validate using a regular expression, since the regex should be decently efficient, and then calculate the Luhn check digit to make sure the number itself is correct. The first two are hard coded to “89” for “telecommunications”, followed by a “1” for the United States country code, and then 3 digits identifying the Verizon Mobile Network Code (MNC) – see the previous link for valid values for other carriers – and then a final check digit using the Luhn algorithm. The ICCID values we are expecting will be 19 digits + a check digit for a total length of 20 numeric characters. I needed to identify valid ICCID values for a project I was working on, and more specifically SIM Cards that are valid on the Verizon LTE network in the United States. The SIM Card is in turn identified by an Integrated Circuit Card Identifier (ICCID) which is printed on the card. The Subscriber Identification Module (SIM) Card is an chip that stores your wireless devices’ International Mobile Subscriber Identity (IMSI).
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