(a) In this section, "hash validation" means a mathematical function that, when applied to a file, creates a unique string of letters and numbers that may be used to confirm that a voting system and its source code have not been altered.
(b) Immediately after receiving a voting system from a vendor, the general custodian of election records shall:
(1) verify that the system delivered is certified by the secretary of state;
(2) perform a hardware diagnostic test on the system as provided by Section 129.022(b);
(3) perform a public test of logic and accuracy on the system as provided by Section 129.023;
(4) perform a hash validation on each ballot marking device, each unit of automatic tabulating equipment, and each tabulation computer to verify that the source code of the equipment has not been altered; and
(5) perform any additional test that the secretary of state may prescribe.
Official text of the Texas Election Code as published by the Texas Legislative Council.