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Uncaught Error: Class Crypt_Rijndael not found in app/code/local/Ebizmarts/SagePaySuite/Model/SagePayForm.php

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Note: This is a historical reference, not a current security baseline. Magento 1 is end-of-life.

Magento Checkout page is blank on payment with SagePay after Magento update or PHP compatibility patch installation. The following PHP error logged: 

Fatal error: Uncaught Error: Class Crypt_Rijndael not found in app/code/local/Ebizmarts/SagePaySuite/Model/SagePayForm.php

Cause

Old versions of Ebizmarts/SagePaySuite extension (prior to 4.2.10) have direct calls to Crypt_Rijndael() class and are incompatible with PHP7.2 support. This class is replaced in Magento updates with PHP7.2 support/patch: lib/phpseclib/Crypt/Rijndael.php file is replaced with newer Rijndael implementation.

Solution

Update Ebizmarts/SagePaySuite extension up to 4.2.10 version or newer with mcrypt-based invocation of Rijndael or revert PHP7.2 support (lib/phpseclib/Crypt/Rijndael.php in particular, where Crypt_Rijndael() class was previously defined).