Add support for AES 256 encryption #465
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Adds a respective GUC and enables TDE AES lib to handle 128 and 256-bit keys. Also adds the support for 256 bit encryption of primary keys
It adds `pg_tde/keys_version`, which contains the latest magic number (version) of the wal and smgr keys. If those versions don't match the current ones at the server start, it will rewrite _keys to the new format if needed and update keys_version. If the start crashed along the way updating _keys, it will retry again on the next start since keys_version wasn't updated.
This is a temporary fix. Tools will be addressed properly in the following PR
Codecov Report❌ Patch coverage is ❌ Your project status has failed because the head coverage (59.08%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage. Additional details and impacted files@@ Coverage Diff @@
## main #465 +/- ##
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- Coverage 59.69% 59.08% -0.62%
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Files 67 67
Lines 10471 10641 +170
Branches 1813 1838 +25
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+ Hits 6251 6287 +36
- Misses 3524 3653 +129
- Partials 696 701 +5
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A new GUC option is applied to all newly created keys - both principal and internal.
We had to change the _keys file format to accommodate 32-byte internal keys. So the keys file migration routine was added at server start.