It seems the ps3jb2 loads masterdiscs with fself, with the algo provided and the right key (which is not provided) you can decrypt said masterdiscs images right on pc and grab the fself files.
// do crypt
unsigned char sector_key;
memset(sector_key, 0, 16);
sector_key = (sector_num & 0xFF000000)>>24;
sector_key = (sector_num & 0x00FF0000)>>16;
sector_key = (sector_num & 0x0000FF00)>> 8;
sector_key = (sector_num & 0x000000FF)>> 0;
// encrypt sector
aes_setkey_enc(&aes_ctx, G_DEBUG_KEY, 128);
aes_crypt_cbc(&aes_ctx, AES_ENCRYPT, aligned_size, sector_key, buff, buff);
aes_setkey_dec(&aes_ctx, G_DEBUG_KEY, 128);
aes_crypt_cbc(&aes_ctx, AES_DECRYPT, aligned_size, sector_key, buff, buff);
that's the algo for masterdiscs
ps3gen dll has the static keys for masterdiscs
you can also get it from sv_iso
the crappy sdk tool that generates masterdisc images for dex
I looked a little more
and it seems the psjb2 just runs masterdiscs
npdrm encrypted but labeled as fself
it's a fself but I dunno what it does
I never looked at it
I don't really care on doing more
if you use the masterdisc algo I provided
and the proper key
which I am not supplying
you can decrypt all the psjb2 disc images
right on pc
grab the fself
and use them to run them on a regular 3.55 fw
basically security == LAME
still interesting to see how they patched the firmware to allow masterdiscs
they also do some auth with the dongle
which involves crypto
to make sure the firmware does not load without it
but if you don't need the firmware to load the games...
they could have added some extra keys in appldr and encrypted the damn eboots at least
I guess they didn't have enough time or enough spu skills
Regarding FSELF from "RikuKH3":
Real FSELFs are never encrypted. You can extract it with official unfself tool from SDK.
But, in this FSELF I looked into (driver sf) ELF inside IS encrypted. You can say this because it's masterdisc fself, but I really doubt it.
It doesn't look like a proper fself to me at all, in header it says that sections unecrypted, but it's not true.
Another thing - Masterdisc Generator tool from Sony gives errors with this EBOOT (if it's a masterdisc eboot as stated, why?).
Seems the above from mathieulh may be incorrect and the eboots ARE encrypted. So much for lame security, maybe this wont be so trivial?