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Complete St. John's
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40
23-St. John's/notes.md
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40
23-St. John's/notes.md
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@ -0,0 +1,40 @@
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# St. John's
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## Sample payload
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```
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800000063041f23630084d78f18b0ef369693ebdb5eaf1290b3cb4a69815345a0de53b9bb6cc7de3c46159a7af7c91c28a3d3691309822290d9c6482fefc03cbbcff35ce9708
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```
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Loadaddr | N/A | Length | Bin | Signature
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---------|-----|--------|-----------|----------
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8000 | 00 | 06 | 3041 | f23630084d78f18b0ef369693ebdb5eaf1290b3cb4a69815345a0de53b9bb6cc7de3c46159a7af7c91c28a3d3691309822290d9c6482fefc03cbbcff35ce9708
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## BSS
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### ed25519 public key
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#### ?!?!?!? WHY IS THIS HERE
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70c3 679b 4336 5ca0 1131 991c c462 135b
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ecae 7df9 73d6 2b16 3c05 c679 746c e52f
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### ed25519 private key
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0821 8d19 996d 174f 147f 157b 9f2c 8011
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4ab3 d2d1 2532 d2ea b925 6161 46a8 15be
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0821 8d19 996d 174f 147f 157b 9f2c 8011
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4ab3 d2d1 2532 d2ea b925 6161 46a8 15be
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## Second verse, same as the first.
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Thanks to [cyphr.me](https://cyphr.me/ed25519_applet/ed.html) for already implementing ed25519.
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Loadaddr | N/A | Length | Bin | Signature
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---------|-----|--------|------------------|----------
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8000 | 00 | 0c | 324000ffb0121000 | 483249ADDE744F491DAED26FFC723E08257D2B210A20177B1556C8F04D0D80B861453D737ED08AE10165CDF40B37DA23967A266F605ECFA9490B9C664682EC0B
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8000 00 0c 324000ffb0121000 483249ADDE744F491DAED26FFC723E08257D2B210A20177B1556C8F04D0D80B861453D737ED08AE10165CDF40B37DA23967A266F605ECFA9490B9C664682EC0B
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# SOLVED
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The CPU completed in 21663 cycles.
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1
23-St. John's/stjohns-crack.py
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1
23-St. John's/stjohns-crack.py
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@ -0,0 +1 @@
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import nacl.public
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53
23-St. John's/stjohns.c
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53
23-St. John's/stjohns.c
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@ -0,0 +1,53 @@
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// uC includes
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#include "../common/io.c"
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#include "../common/lib.c"
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typedef unsigned char u8;
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typedef unsigned short u16;
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int main () {
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u8 *ed25519_pubkey = (mem + 0x2440);
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u8 *buf = (mem + 0x2460); // >=> 0x2460
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u8 sig_buf[64]; // >=> sp
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puts ("Welcome to the secure program loader.");
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while (1) {
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u16 loadaddr; // >=> r11
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u8 len; // >=> r10
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puts ("Please enter debug payload.");
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memset (buf, 0, 0x400);
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getsn (buf, 0x3ff);
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loadaddr = (buf[0] << 8) + (buf[1]);
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len = buf[3];
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if (0x8000 > loadaddr || loadaddr >= 0xf001) {
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puts ("Load address outside allowed range of 0x8000-0xF000");
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continue;
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}
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if (loadaddr & 1) {
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puts ("Load address unaligned");
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continue;
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}
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if (len - 6 > 0x3bb) {
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puts ("Invalid payload length");
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continue;
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}
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u8 *signature = buf + len;
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memcpy (sig_buf, buf + len, 0x40);
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if (verify_ed25519 (ed25519_pubkey, buf, len, sig_buf) != 0x1) {
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puts ("Incorrect signature, continuing");
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continue;
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}
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puts ("Signature valid, executing payload");
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printf ("LA:%p, BF:%p, LEN:%x\n", mem + loadaddr, buf, len);
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memcpy (mem + loadaddr, buf + 0x4, len);
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}
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}
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386
23-St. John's/stjohns.txt
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386
23-St. John's/stjohns.txt
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@ -0,0 +1,386 @@
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Hex:
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:10 4400 00 55425C0135D0085A8245602831400044 4D
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:10 4410 00 3F4060000F930824924260285C012F83 84
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:10 4420 00 9F4F28470024F8233F4000040F930724 A0
|
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:10 4430 00 924260285C011F83CF436024F9233150 EE
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:10 4440 00 C0FF3F404046B012A4453F406646B012 10
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:10 4450 00 A4453D4000040E433F406024B012D445 C3
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:10 4460 00 3E40FF033F406024B01286455B426024 1B
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:10 4470 00 8B105F4261240BDF5A4263240B930334 99
|
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:10 4480 00 3B9001F005283F408246B012A445DD3F 35
|
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:10 4490 00 1BB305243F40B646B012A445D63F0F4A 91
|
||||
:10 44A0 00 3F50FAFF3F90BB0305283F40CD46B012 76
|
||||
:10 44B0 00 A445CB3F3D4040000E4A3E5060240F41 92
|
||||
:10 44C0 00 B012C2450C410D4A3E4060243F404024 9A
|
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:10 44D0 00 B01252451F9305243F40E446B012A445 54
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||||
:10 44E0 00 B43F3F400447B012A4450D4A3E406424 07
|
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:10 44F0 00 0F4BB012C2458B12A83F32D0F000FD3F E7
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:10 4500 00 30403E461F41020002124F4F8F103FD0 F5
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:10 4510 00 0080024FB0121000324130410D120E12 D5
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:10 4520 00 0F1230123000B0120445315230410D12 DA
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:10 4530 00 0E120F1230123100B012044531523041 C8
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:10 4540 00 0D120E120F1230123200B01204453152 09
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:10 4550 00 30410B1204120441245221838443FAFF 98
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:10 4560 00 3B40FAFF0B540B120C120D120E120F12 DD
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:10 4570 00 30123300B01204451F44FAFF31500E00 D0
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:10 4580 00 34413B4130410E120F122312B0120445 48
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:10 4590 00 3150060030418F110F120312B0120445 42
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:10 45A0 00 215230410B120B4F033C1B53B0129645 66
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:10 45B0 00 6F4B4F93FA237F400A00B01296453B41 60
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:10 45C0 00 30410C4F043CFC4E00001C533D530D93 F6
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:10 45D0 00 FA2330410B120A12091208123D900600 0C
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:10 45E0 00 092C0C4F043CCC4E00001C533D530D93 42
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:10 45F0 00 FA23203C4E4E4B4E0B9303240C4B8C10 55
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:10 4600 00 0BDC1FB306243D53CF4E0000094F1953 56
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:10 4610 00 013C094F0C4D12C30C100A49084C8A4B 3F
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:10 4620 00 00002A533853FB230C5C0C591DF30224 61
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:10 4630 00 CC4E0000384139413A413B4130410013 F2
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:10 4640 00 57656C636F6D6520746F207468652073 A7
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:10 4650 00 65637572652070726F6772616D206C6F 33
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:10 4660 00 616465722E00506C6561736520656E74 BF
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:10 4670 00 6572206465627567207061796C6F6164 32
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:10 4680 00 2E004C6F61642061646472657373206F E7
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:10 4690 00 75747369646520616C6C6F7765642072 F2
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:10 46A0 00 616E6765206F66203078383030302D30 8D
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:10 46B0 00 7846303030004C6F6164206164647265 0C
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:10 46C0 00 737320756E616C69676E656400496E76 00
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:10 46D0 00 616C6964207061796C6F6164206C656E D7
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||||
:10 46E0 00 67746800496E636F7272656374207369 E2
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:10 46F0 00 676E61747572652C20636F6E74696E75 78
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:10 4700 00 696E67005369676E6174757265207661 C2
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:10 4710 00 6C69642C20657865637574696E672070 B8
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:08 4720 00 61796C6F61640000 17
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Strings:
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:10 4728 00 70C3679B43365CA01131991CC462135B 4C
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:10 4738 00 ECAE7DF973D62B163C05C679746CE52F 63
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:10 4748 00 08218D19996D174F147F157B9F2C8011 A7
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:10 4758 00 4AB3D2D12532D2EAB925616146A815BE 3D
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:10 4768 00 08218D19996D174F147F157B9F2C8011 87
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:10 4778 00 4AB3D2D12532D2EAB925616146A815BE 1D
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Exception_Vectors:
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:10 FF80 00 00450045004500450045004500450045 49
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:10 FF90 00 00450045004500450045004500450044 3A
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Start:
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:04 0000 03 00004400 B5
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What: ; does this do?
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:00 0000 01 FF
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Obj:
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0010 <__trap_interrupt>
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0010: 3041 ret
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4400 <__watchdog_support>
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4400: 5542 5c01 mov.b &0x015c, r5
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4404: 35d0 085a bis #0x5a08, r5
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4408: 8245 6028 mov r5, &0x2860
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440c <__init_stack>
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440c: 3140 0044 mov #0x4400 <__watchdog_support>, sp
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4410 <__do_copy_data>
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4410: 3f40 6000 mov #0x60, r15
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4414: 0f93 tst r15
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4416: 0824 jz #0x4428 <__do_clear_bss+0x0>
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4418: 9242 6028 5c01 mov &0x2860, &0x015c
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441e: 2f83 decd r15
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4420: 9f4f 2847 0024 mov 0x4728(r15), 0x2400(r15)
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4426: f823 jnz #0x4418 <__do_copy_data+0x8>
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4428 <__do_clear_bss>
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4428: 3f40 0004 mov #0x400, r15
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442c: 0f93 tst r15
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442e: 0724 jz #0x443e <main+0x0>
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4430: 9242 6028 5c01 mov &0x2860, &0x015c
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4436: 1f83 dec r15
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4438: cf43 6024 mov.b #0x0, 0x2460(r15)
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443c: f923 jnz #0x4430 <__do_clear_bss+0x8>
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443e <main>
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;? char sig_buf[64]; // >=> sp
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443e: 3150 c0ff add #0xffc0, sp
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;* puts ("Welcome to the secure program loader.");
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4442: 3f40 4046 mov #0x4640 "Welcome to the secure program loader." r15
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4446: b012 a445 call #0x45a4 <puts>
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;* while (1)
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continue:
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;* puts ("Please enter debug payload.");
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444a: 3f40 6646 mov #0x4666 "Please enter debug payload." r15
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444e: b012 a445 call #0x45a4 <puts>
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;? u8 buf[0x400]; // >=> 0x2460
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;* memset (buf, 0, 0x400);
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4452: 3d40 0004 mov #0x400, r13
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4456: 0e43 clr r14
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4458: 3f40 6024 mov #0x2460, r15
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445c: b012 d445 call #0x45d4 <memset>
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;* getsn(buf, 0x3ff);
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4460: 3e40 ff03 mov #0x3ff, r14
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4464: 3f40 6024 mov #0x2460, r15
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4468: b012 8645 call #0x4586 <getsn>
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;* void * loadaddr /* r11 */ = (buf[0] << 8) + (buf[1]);
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446c: 5b42 6024 mov.b &0x2460, r11
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4470: 8b10 swpb r11
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4472: 5f42 6124 mov.b &0x2461, r15
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4476: 0bdf bis r15, r11
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;! byte index 0x2 goes unused!
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;*size_t len = buf[3];
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4478: 5a42 6324 mov.b &0x2463, r10
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;*if (0x8000 > loadaddr || loadaddr >= 0xf001)
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447c: 0b93 tst r11
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447e: 0334 jge #0x4486 <main+0x48>
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4480: 3b90 01f0 cmp #0xf001, r11
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4484: 0528 jnc #0x4490 <main+0x52>
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;* puts ("Load address outside allowed range of 0x8000-0xF000");
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4486: 3f40 8246 mov #0x4682 "Load address outside allowed range of 0x8000-0xF000" r15
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448a: b012 a445 call #0x45a4 <puts>
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;* continue;
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448e: dd3f jmp #0x444a <main+0xc>
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;* if (loadaddr & 1)
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4490: 1bb3 bit #0x1, r11
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4492: 0524 jz #0x449e <main+0x60>
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;* puts ("Load address unaligned");
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4494: 3f40 b646 mov #0x46b6 "Load address unaligned" r15
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4498: b012 a445 call #0x45a4 <puts>
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;* continue;
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449c: d63f jmp #0x444a <main+0xc>
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;* if (len - 6 > 0x3bb)
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449e: 0f4a mov r10, r15
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44a0: 3f50 faff add #0xfffa, r15
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44a4: 3f90 bb03 cmp #0x3bb, r15
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44a8: 0528 jnc #0x44b4 <main+0x76>
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;* puts ("Invalid payload length");
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44aa: 3f40 cd46 mov #0x46cd "Invalid payload length" r15
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44ae: b012 a445 call #0x45a4 <puts>
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;* continue;
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44b2: cb3f jmp #0x444a <main+0xc>
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;* memcpy (sig_buf, buf+len, 0x40)
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44b4: 3d40 4000 mov #0x40, r13
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44b8: 0e4a mov r10, r14
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44ba: 3e50 6024 add #0x2460, r14
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44be: 0f41 mov sp, r15
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44c0: b012 c245 call #0x45c2 <memcpy>
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;* verify_ed25519 (ed25519_pubkey /*0x2440*/, buf /*0x2460*/, size /*r10*/, sig_buf /*sp*/);
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44c4: 0c41 mov sp, r12
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44c6: 0d4a mov r10, r13
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44c8: 3e40 6024 mov #0x2460, r14
|
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44cc: 3f40 4024 mov #0x2440, r15
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44d0: b012 5245 call #0x4552 <verify_ed25519>
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;* if (result != 0x1)
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44d4: 1f93 cmp #0x1, r15
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44d6: 0524 jeq #0x44e2 <main+0xa4>
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;* puts ("Incorrect signature, continuing");
|
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44d8: 3f40 e446 mov #0x46e4 "Incorrect signature, continuing" r15
|
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44dc: b012 a445 call #0x45a4 <puts>
|
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;* continue;
|
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44e0: b43f jmp #0x444a <main+0xc>
|
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;* puts ("Signature valid, executing payload");
|
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44e2: 3f40 0447 mov #0x4704 "Signature valid, executing payload" r15
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44e6: b012 a445 call #0x45a4 <puts>
|
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;* memcpy ( loadaddr /*dest*/, buf + 0x4 /*src*/, len /*size*/);
|
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44ea: 0d4a mov r10, r13
|
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44ec: 3e40 6424 mov #0x2464, r14
|
||||
44f0: 0f4b mov r11, r15
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44f2: b012 c245 call #0x45c2 <memcpy>
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;* payload ();
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44f6: 8b12 call r11
|
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;* continue;
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44f8: a83f jmp #0x444a <main+0xc>
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|
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|
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44fa <__stop_progExec__>
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44fa: 32d0 f000 bis #0xf0, sr
|
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44fe: fd3f jmp #0x44fa <__stop_progExec__+0x0>
|
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4500 <__ctors_end>
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4500: 3040 3e46 br #0x463e <_unexpected_>
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4504 <INT>
|
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4504: 1f41 0200 mov 0x2(sp), r15
|
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4508: 0212 push sr
|
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450a: 4f4f mov.b r15, r15
|
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450c: 8f10 swpb r15
|
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450e: 3fd0 0080 bis #0x8000, r15
|
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4512: 024f mov r15, sr
|
||||
4514: b012 1000 call #0x10
|
||||
4518: 3241 pop sr
|
||||
451a: 3041 ret
|
||||
451c <sha1>
|
||||
451c: 0d12 push r13
|
||||
451e: 0e12 push r14
|
||||
4520: 0f12 push r15
|
||||
4522: 3012 3000 push #0x30
|
||||
4526: b012 0445 call #0x4504 <INT>
|
||||
452a: 3152 add #0x8, sp
|
||||
452c: 3041 ret
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||||
452e <sha256>
|
||||
452e: 0d12 push r13
|
||||
4530: 0e12 push r14
|
||||
4532: 0f12 push r15
|
||||
4534: 3012 3100 push #0x31
|
||||
4538: b012 0445 call #0x4504 <INT>
|
||||
453c: 3152 add #0x8, sp
|
||||
453e: 3041 ret
|
||||
4540 <sha512>
|
||||
4540: 0d12 push r13
|
||||
4542: 0e12 push r14
|
||||
4544: 0f12 push r15
|
||||
4546: 3012 3200 push #0x32
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454a: b012 0445 call #0x4504 <INT>
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||||
454e: 3152 add #0x8, sp
|
||||
4550: 3041 ret
|
||||
4552 <verify_ed25519>
|
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4552: 0b12 push r11
|
||||
4554: 0412 push r4
|
||||
4556: 0441 mov sp, r4
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||||
4558: 2452 add #0x4, r4
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||||
455a: 2183 decd sp
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||||
455c: 8443 faff clr -0x6(r4)
|
||||
4560: 3b40 faff mov #0xfffa, r11
|
||||
4564: 0b54 add r4, r11
|
||||
4566: 0b12 push r11
|
||||
4568: 0c12 push r12
|
||||
456a: 0d12 push r13
|
||||
456c: 0e12 push r14
|
||||
456e: 0f12 push r15
|
||||
4570: 3012 3300 push #0x33
|
||||
4574: b012 0445 call #0x4504 <INT>
|
||||
4578: 1f44 faff mov -0x6(r4), r15
|
||||
457c: 3150 0e00 add #0xe, sp
|
||||
4580: 3441 pop r4
|
||||
4582: 3b41 pop r11
|
||||
4584: 3041 ret
|
||||
4586 <getsn>
|
||||
4586: 0e12 push r14
|
||||
4588: 0f12 push r15
|
||||
458a: 2312 push #0x2
|
||||
458c: b012 0445 call #0x4504 <INT>
|
||||
4590: 3150 0600 add #0x6, sp
|
||||
4594: 3041 ret
|
||||
4596 <putchar>
|
||||
4596: 8f11 sxt r15
|
||||
4598: 0f12 push r15
|
||||
459a: 0312 push #0x0
|
||||
459c: b012 0445 call #0x4504 <INT>
|
||||
45a0: 2152 add #0x4, sp
|
||||
45a2: 3041 ret
|
||||
45a4 <puts>
|
||||
45a4: 0b12 push r11
|
||||
45a6: 0b4f mov r15, r11
|
||||
45a8: 033c jmp #0x45b0 <puts+0xc>
|
||||
45aa: 1b53 inc r11
|
||||
45ac: b012 9645 call #0x4596 <putchar>
|
||||
45b0: 6f4b mov.b @r11, r15
|
||||
45b2: 4f93 tst.b r15
|
||||
45b4: fa23 jnz #0x45aa <puts+0x6>
|
||||
45b6: 7f40 0a00 mov.b #0xa, r15
|
||||
45ba: b012 9645 call #0x4596 <putchar>
|
||||
45be: 3b41 pop r11
|
||||
45c0: 3041 ret
|
||||
45c2 <memcpy>
|
||||
45c2: 0c4f mov r15, r12
|
||||
45c4: 043c jmp #0x45ce <memcpy+0xc>
|
||||
45c6: fc4e 0000 mov.b @r14+, 0x0(r12)
|
||||
45ca: 1c53 inc r12
|
||||
45cc: 3d53 add #-0x1, r13
|
||||
45ce: 0d93 tst r13
|
||||
45d0: fa23 jnz #0x45c6 <memcpy+0x4>
|
||||
45d2: 3041 ret
|
||||
45d4 <memset>
|
||||
45d4: 0b12 push r11
|
||||
45d6: 0a12 push r10
|
||||
45d8: 0912 push r9
|
||||
45da: 0812 push r8
|
||||
45dc: 3d90 0600 cmp #0x6, r13
|
||||
45e0: 092c jc #0x45f4 <memset+0x20>
|
||||
45e2: 0c4f mov r15, r12
|
||||
45e4: 043c jmp #0x45ee <memset+0x1a>
|
||||
45e6: cc4e 0000 mov.b r14, 0x0(r12)
|
||||
45ea: 1c53 inc r12
|
||||
45ec: 3d53 add #-0x1, r13
|
||||
45ee: 0d93 tst r13
|
||||
45f0: fa23 jnz #0x45e6 <memset+0x12>
|
||||
45f2: 203c jmp #0x4634 <memset+0x60>
|
||||
45f4: 4e4e mov.b r14, r14
|
||||
45f6: 4b4e mov.b r14, r11
|
||||
45f8: 0b93 tst r11
|
||||
45fa: 0324 jz #0x4602 <memset+0x2e>
|
||||
45fc: 0c4b mov r11, r12
|
||||
45fe: 8c10 swpb r12
|
||||
4600: 0bdc bis r12, r11
|
||||
4602: 1fb3 bit #0x1, r15
|
||||
4604: 0624 jz #0x4612 <memset+0x3e>
|
||||
4606: 3d53 add #-0x1, r13
|
||||
4608: cf4e 0000 mov.b r14, 0x0(r15)
|
||||
460c: 094f mov r15, r9
|
||||
460e: 1953 inc r9
|
||||
4610: 013c jmp #0x4614 <memset+0x40>
|
||||
4612: 094f mov r15, r9
|
||||
4614: 0c4d mov r13, r12
|
||||
4616: 12c3 clrc
|
||||
4618: 0c10 rrc r12
|
||||
461a: 0a49 mov r9, r10
|
||||
461c: 084c mov r12, r8
|
||||
461e: 8a4b 0000 mov r11, 0x0(r10)
|
||||
4622: 2a53 incd r10
|
||||
4624: 3853 add #-0x1, r8
|
||||
4626: fb23 jnz #0x461e <memset+0x4a>
|
||||
4628: 0c5c add r12, r12
|
||||
462a: 0c59 add r9, r12
|
||||
462c: 1df3 and #0x1, r13
|
||||
462e: 0224 jz #0x4634 <memset+0x60>
|
||||
4630: cc4e 0000 mov.b r14, 0x0(r12)
|
||||
4634: 3841 pop r8
|
||||
4636: 3941 pop r9
|
||||
4638: 3a41 pop r10
|
||||
463a: 3b41 pop r11
|
||||
463c: 3041 ret
|
||||
463e <_unexpected_>
|
||||
463e: 0013 reti pc
|
||||
4640 .strings:
|
||||
4640: "Welcome to the secure program loader."
|
||||
4666: "Please enter debug payload."
|
||||
4682: "Load address outside allowed range of 0x8000-0xF000"
|
||||
46b6: "Load address unaligned"
|
||||
46cd: "Invalid payload length"
|
||||
46e4: "Incorrect signature, continuing"
|
||||
4704: "Signature valid, executing payload"
|
||||
|
||||
|
||||
Prereqs:"Churchill"
|
||||
Name:"St. John's"
|
||||
Text: """
|
||||
Lockitall LOCKIT 2 r A.01
|
||||
______________________________________________________________________
|
||||
|
||||
User Manual: Lockitall LockIT 2, rev a.01
|
||||
______________________________________________________________________
|
||||
|
||||
|
||||
OVERVIEW
|
||||
|
||||
- The firmware has been updated to resolve a vulnerability.
|
||||
|
||||
|
||||
DETAILS
|
||||
|
||||
The LockIT 2 A.01 is the second of a new series of locks. It is
|
||||
controlled by a MSP430 microcontroller. The MSP430 is a very low-
|
||||
power device, chosen because we found several crates of old stock.
|
||||
|
||||
This lock only accepts biometric and NFC inputs, and does not have
|
||||
a traditional password prompt.
|
||||
|
||||
To support rapid development cycles this lock accepts a program
|
||||
from the old password input prompt.
|
||||
|
||||
800000063041f23630084d78f18b0ef369693ebdb5eaf1290b3cb4a69815345a0d
|
||||
e53b9bb6cc7de3c46159a7af7c91c28a3d3691309822290d9c6482fefc03cbbcff
|
||||
35ce9708
|
||||
|
||||
This is Hardware Version Beta.
|
||||
|
||||
This is Software Revision 04.
|
||||
|
||||
|
||||
|
||||
(c) 2021 LOCKITALL Page 1/1
|
||||
"""
|
||||
|
||||
X:170
|
||||
Y:325
|
||||
Rating:20
|
||||
Patch:""
|
||||
Loading…
Reference in New Issue
Block a user