CODEWITHSUNDEEP
luhn
SUNNY
SUNNY

Reputation: 125

How to calculate check digits for a Hexadecimal IMEI (Number+Character) using luhn's algorithm?

I want to understand the logic so that I can implement this algorithm in java. I want to calculate check digit for a valid hexadecimal IMEI number. For example - 6C4BFFC0000004 Please help me with the algorithm. I tried to find solution in google but I could not find correct answer using those algorithm.

Calculation what I did is like -

But the check digit for the above IMEI is 4. I am getting 7. I dont know where I am going wrong.

Upvotes: 3

Views: 2776

Answers (2)

ptdecker
ptdecker

Reputation: 424

Actually, you do not need to convert to Decimal first. If you have an "IMEI" in hex it is really an MEID. IMEIs are a decimal-only subset of MEIDs. There is actually a patent out on how to calculate the Luhn for hex-based MEIDs. See claims 0113 through 0119 of the following:

https://patentimages.storage.googleapis.com/74/63/03/3fb507952c7ccf/US20080194223A1.pdf

Upvotes: 1

ogs
ogs

Reputation: 1239

I have had the same need and I found the solution by using the logic explained on the following website :

Luhn test of credit card numbers

I write a function based on the C example in order to determine the last digit. Behavior will be the same in Java.

Upvotes: 0

Related Questions