The CardKeyProviderCsv class implements a column decryption scheme
where columns are protected using a transport key. The CSV files
are enrcypted using contrib/csv-encrypt-columns.py.
The current implementation has two main problems:
- The decryption code in CardKeyProviderCsv is not specific to CSV files.
It could be re-used in other formats, for example to decrypt columns
(fields) red from a database. So let's split the decryption code in a
separate class.
- The encryption code in csv-encrypt-columns.py accesses methods and
properties in CardKeyProviderCsv. Also having the coresponding
encryption code somewhere out of tree may be confusing. Let's improve
the design and put encryption and decryption functions in a single
class. Let's also make sure the encryption/decryption is covered by
unittests.
Related: SYS#7725
Change-Id: I180457d4938f526d227c81020e4e03c6b3a57dab
There is no unit-test for the CardKeyProviderCsv class yet. Let's add
one to ensure that the CardKeyProviderCsv class keeps working as expected.
Related: SYS#7725
Change-Id: I52519847a4c4a13a7bca49985133872b01c4aaab
