I just goggle'd the constants and it looks like a regular 8-round TEA to me. The official source has 0x9E3779B9 as the delta (which is -Y_STEP), "y+= step;" and "y -= step;" switch places to match; Y_INIT is then just (8 * DELTA)&0xFFFFFFFF.
Where is this code from? I presume reverse engineering of the BL files (surely explains negating the constant). If so, why can't we RE (or just take the keys off) other header versions? R. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Daniel Stenberg Sent: Friday, June 30, 2006 8:41 PM To: Rockbox Development Subject: mi4, BL and more Hello I just wanted to put your attention to the fact that we now have a first (en/de)crypt tool for (some) mi4 files. All details on my mi4 page: http://daniel.haxx.se/sansa/mi4.html We can use some help to get the rest figured out as well! -- Daniel Stenberg -- http://www.rockbox.org/ -- http://daniel.haxx.se/
