Eric Wild c582b5fee3 GP: fix kcb for non block aligned keys ...

how encrypt_key() pads a kcv:
len(key) % blocksize bytes
what it should do to actually do it right:
blocksize - len(key) % blocksize
so the plaintext handed to the cipher was only block aligned by luck as
long as the key length happened to be a multiple of half the block size.

And of course decrypt_key() did not invert encrypt_key() at all,
the clear text length of GP CardSpec v2.3 Table 11-70 precedes the
ENCRYPTED kcv, but it was parsed out of the DECRYPTED data, and the
length byte itself was fed to the cipher along with the cryptogram.

Fix this up with a helper and tests so it is actually usable.

Change-Id: I02b4f2ed948c31e1741e40f0226fb49757fa2570

2026-09-07 19:51:23 +02:00

..

card_sanitizer

tests/pySim-smpp2sim_test/card_sanitizer: update card backup with new test keyset

2026-03-10 09:23:03 +00:00

pySim-prog_test

pySim-prog/cards: fix programming of EF.SMSP

2026-04-29 19:39:14 +00:00

pySim-shell_test

pySim/transport: fix GET RESPONSE behaviour

2026-04-29 19:34:27 +00:00

pySim-smpp2sim_test

tests: pySim-smpp2sim_test.sh: fix copy-pasted comment

2026-04-23 23:54:10 +07:00

pySim-trace_test

cosmetic: fix company name in copyright header.

2026-01-06 21:41:23 +00:00

unittests

GP: fix kcb for non block aligned keys

2026-09-07 19:51:23 +02:00