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Sha-512 hash mismatch

Hi,

SHA-512 hash mismatch when we enter non-ascii characters in the hosted payment page fields such as Firstname, lastname and address.

Example from Sandbox testing:

Tested with following card information:
  Card number: 4111111111111111
  Expiry:1222
  CVV: 123
  Firstname: Renée
  Lastname: brown
  Address: 123 main street
  Zip: 30321

Transaction Response:
x_card_type: Visa
x_method: CC
x_state:
x_last_name: brown
x_ship_to_city:
x_cvv2_resp_code:
x_email:
x_avs_code: P
x_tax_exempt: FALSE
x_auth_code: 000000
x_SHA2_Hash: CA8F8217A69502E67BAB881A4B6B008480E73DFBD2132D864D74E7F660D33F58B5C067011267D98DA4FEA9AEE98C35A7F581A2B8618D9537D470A7001A796ADF
x_type: auth_only
x_response_code: 1
x_invoice_num: 900002667
x_address: 123 main street
x_response_reason_text: (TESTMODE) This transaction has been approved.
x_description: Brygid - Test Store
x_company:
x_MD5_Hash:
x_cavv_response:
x_duty: 0.00
x_cust_id: s900002667
x_account_number: XXXX1111
x_test_request: true
x_ship_to_address:
x_country:
x_city:
x_ship_to_company:
x_fax:
x_zip: 30321
x_first_name: Ren�
x_ship_to_first_name:
x_tax: 0.00
x_phone:
x_ship_to_state:
x_ship_to_last_name:
x_po_num:
x_ship_to_country:
x_response_reason_code: 1
x_ship_to_zip:
x_trans_id: 0
x_freight: 0.00
x_amount: 3.23


Datastring to generate hash = ^0^true^1^000000^^^P^CC^XXXX1111^3.23^^Ren�^brown^123 main street^^^30321^^^^^^^^^^^^^900002667^

Hash generated: 91D06EE60901B000B4308A1A10BBE916A8B2C939C69F5E976D37CB2096887AAA9BAC0F6E7B96A512C5B3650C6A3C11E9F3A9C8AE7939E4234BD36A0CD3C38255


It is an issue with character encoding but we don't know how Auth.net handles the encoding before generating the hash which they send in the response.

Will really appreciate any help from the community to resolve this issue.

Thanks


maninder
Member
21 REPLIES 21

@Renaissancemany thanks

 

As someone's post mentions, we just need to know how Auth.net is encoding the strings before carrying out the hash calculation.

 

 

@inkeyes

It is a url encoded post request, I am pretty sure. There is no easy way around it. What I did is take the raw post data and convert it, character for character. It was a sort of fun exercise and then the person who asked me didn’t want to buy it. I had hoped to get some cash out of it, as I know of no one else who figured out how to do this. I spent 4 hours on the below, about 2.5 of which was trying (in futility) to find a way to validate an uppercase Lithuanian I reliably. That one is a wild card and if your customers use that it is likely to break your validation process. I could modify the below script to validate such responses, but god knows how long it would take me. It would have to be some sort of iterative process testing scenarios. Pretty much all of the remaining characters can be converted. Disclaimer: I have tested this script on responses containing every single diacritic character except the lith I. I have also tested on a host of mixed bag requests with dozens and dozens of these characters. It has worked on them all. I cannot guarantee that there is not some permutation or combination of these characters that will throw this off. Every request I made I deliberately crammed it full of them. I would say that if your customers use only normal amounts of them you are fine. Disclaimer #2, I had made some modifications that will not be useful to users on the forum (more trying to validate the I) and removed those modifications before posting. The below script hasn’t been tested. If it works for you let me know. Eyeballing it I believe it should.

https://community.developer.authorize.net/t5/Integration-and-Testing/Working-php-sha512-Verification...