Skip to content

Instantly share code, notes, and snippets.

@pawlos

pawlos/code.asm

Created October 21, 2025 16:11
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save pawlos/52c423b81c97abb8271edefab7ee74a1 to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save pawlos/52c423b81c97abb8271edefab7ee74a1 to your computer and use it in GitHub Desktop.
Download ZIP
Hack.lu 2025 - Instructions unclear asm code
Raw
code.asm
.section .ikea
FLEN: db 65
paX: db 23
BLKSZ: db 12
b00ts: db 47
c5d: db 225,204,82,249,67,214,139,164,154,116,172,47,62,84,45,3,47,104,35,84,93,44,34,6,25,163,30,206,78,117,5,225,233,23,152,55,146,238,226,49,74,173,199,34,15,78,84,81,161,96,220,110,128,201,46,27,123,41,191,6,123,58,89,119,69
kallax: db 3,0,0,2,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,1,0,0
billy: db 166,241,180,132,190,47,251,88,10,46,127,195,92,216,151,226,103,173,3,218,0,14,199,119,228,111,214,104,131,252,134,152,225,52,39,60,56,179,4,144,24,203,233,156,167,91,146,254,73,27,187,123,113,40,83,41,1,81,22,202,201,176,100,158,87,50,128,182,84,209,55,240,20,62,51,184,75,220,175,192,12,172,5,204,61,186,30,154,255,101,213,208,67,145,23,36,170,141,108,212,181,193,82,37,74,211,109,155,168,221,138,207,121,130,198,9,188,164,124,249,217,157,110,139,210,229,8,116,93,6,178,29,70,2,129,53,183,197,99,95,38,244,65,125,85,49,194,94,11,219,148,215,115,223,26,140,44,245,19,15,248,86,7,205,253,171,160,169,246,105,191,54,243,239,238,79,13,242,143,72,68,25,227,97,34,31,161,196,32,147,126,78,71,57,159,137,114,42,230,250,117,106,59,17,133,98,16,177,136,90,232,174,80,206,185,234,107,76,35,162,237,58,200,163,89,77,222,142,102,21,189,122,48,224,165,69,64,247,149,66,18,236,153,135,96,33,28,235,231,150,120,118,112,63,45,43,177,88,7,134,38,179,127,126,41,20,25,233,37,141,82,124,215,206,128,237,239,19,227,180,83,248,249,165,57,228,232,161,94,6,192,142,64,200,77,42,132,4,221,153,65,48,238,135,89,27,70,122,13,210,16,155,160,119,17,240,242,188,251,51,107,22,208,162,197,230,39,229,146,157,168,76,67,105,49,213,96,241,109,104,87,125,68,44,66,140,26,136,143,203,245,211,183,10,193,43,100,172,171,28,85,98,226,151,73,236,91,40,198,110,219,114,117,111,23,60,101,244,62,0,47,186,175,174,191,167,52,148,189,173,61,194,250,231,130,54,50,187,93,185,9,218,255,214,149,106,32,145,71,31,209,202,29,154,118,190,201,56,12,204,84,5,115,246,58,14,166,103,235,170,147,247,53,196,2,99,3,92,199,150,97,46,30,131,35,176,81,78,222,133,59,18,178,253,79,182,123,75,217,163,137,113,223,95,21,252,63,195,158,121,36,34,205,184,224,129,102,11,8,243,225,159,254,33,181,112,90,74,216,138,120,80,24,1,220,156,139,72,55,207,164,86,69,234,169,144,108,15,212,152,116,45,58,14,250,180,0,171,247,215,46,166,50,118,73,231,33,7,223,79,242,113,61,88,177,2,147,202,18,15,167,152,101,27,183,220,158,30,224,128,153,198,187,6,178,22,34,232,210,5,191,219,110,226,244,9,117,45,248,245,8,71,161,124,205,105,69,92,241,132,246,81,51,142,20,37,172,208,160,75,62,53,42,13,236,193,80,144,181,151,155,235,170,141,59,189,41,148,87,233,197,109,123,253,206,19,86,126,188,254,195,182,133,100,130,55,116,201,4,112,131,225,96,125,114,60,176,194,149,21,211,156,200,134,216,240,111,28,243,140,68,255,237,3,102,10,64,207,238,12,67,32,29,99,239,162,164,174,120,115,90,190,230,184,89,228,78,221,36,107,52,157,95,17,108,74,234,145,185,54,154,229,76,251,94,23,218,137,204,26,136,70,222,186,165,91,39,179,173,163,85,66,24,168,150,72,47,199,139,119,217,169,122,82,40,214,213,175,252,56,209,146,63,57,11,138,127,104,31,1,159,97,83,249,196,106,48,43,227,143,98,16,212,135,121,84,44,35,203,129,93,38,25,192,103,77,65,49,255,148,204,174,252,10,233,164,253,76,113,9,187,33,51,20,87,196,59,193,27,221,116,40,107,37,69,38,172,129,56,72,194,119,142,203,168,224,120,133,156,247,195,166,143,70,241,126,118,90,191,186,235,234,104,100,210,34,207,152,246,208,229,109,64,57,190,160,44,140,132,139,28,62,79,92,182,167,19,202,238,60,111,228,213,163,189,237,14,135,13,58,15,150,81,48,42,226,93,211,236,21,157,217,250,231,24,185,68,7,198,225,138,219,192,249,171,105,242,26,106,77,197,95,200,245,180,201,179,43,88,244,136,147,6,121,39,153,223,36,146,232,144,89,161,251,218,178,181,215,12,78,22,230,176,159,169,99,80,17,206,35,114,66,212,173,85,53,52,222,127,31,125,103,82,243,71,8,155,83,29,0,108,254,18,154,84,177,115,94,214,101,46,188,102,73,1,170,97,5,151,134,98,45,4,131,91,65,54,32,16,205,141,49,220,158,137,124,112,23,2,209,130,67,199,122,227,41,11,184,96,47,183,149,239,110,25,175,145,123,50,30,240,165,74,55,3,216,128,117,63,248,162,86,75,61,144,192,167,72,80,203,160,78,18,82,208,212,222,235,228,84,161,12,5,73,132,239,89,252,56,21,233,102,187,231,36,2,74,246,39,85,1,130,110,0,97,226,240,156,254,151,47,31,205,137,150,224,64,79,206,123,75,159,202,111,214,183,193,220,67,140,55,3,182,93,136,200,135,127,117,145,17,8,204,34,38,115,100,255,114,26,43,249,68,46,25,186,44,19,91,210,42,32,185,81,7,52,165,90,71,178,147,27,195,98,124,134,216,163,177,45,103,62,170,173,108,139,146,232,10,229,121,131,16,191,94,237,190,181,245,171,230,57,172,247,122,107,154,168,169,213,217,209,238,241,201,194,225,95,158,20,133,86,40,128,125,179,50,157,242,142,243,129,174,218,223,116,54,37,175,118,99,24,13,104,23,164,120,184,119,66,180,87,77,253,244,251,101,88,83,215,29,248,152,59,198,166,92,69,48,4,143,138,76,30,176,250,65,49,211,199,221,109,227,22,162,113,41,11,219,148,96,58,197,149,61,15,196,141,70,35,9,188,153,105,33,6,234,207,155,126,51,28,236,189,112,106,63,60,53,14,133,211,196,173,138,240,254,105,34,251,116,151,242,225,122,106,127,120,33,36,40,56,130,156,252,207,29,219,227,100,149,46,186,176,70,51,200,101,230,136,109,67,243,21,234,134,93,50,150,64,74,19,24,141,155,168,241,25,18,16,171,175,121,201,245,255,187,115,82,3,226,107,43,154,124,42,145,52,32,182,91,157,62,237,76,75,220,1,45,85,218,193,54,2,35,253,90,163,58,113,28,203,167,98,4,162,152,189,87,217,146,123,49,89,0,41,192,13,214,61,9,47,205,222,147,38,231,246,199,174,39,129,232,114,135,92,83,55,14,185,238,224,102,161,78,53,216,159,190,65,131,165,139,80,158,81,212,63,140,79,30,26,143,233,248,71,249,22,247,77,180,166,179,197,236,223,244,66,6,125,183,170,137,213,160,86,250,195,119,27,12,208,210,37,177,169,97,48,228,215,112,110,84,59,5,209,221,10,229,144,103,11,153,72,198,164,118,69,7,191,132,104,23,172,148,96,17,202,194,184,88,20,188,126,73,235,204,108,60,31,15,8,178,128,94,44,206,111,95,68,239,181,142,117,99,57
.section .bss.shuffled
IN: rb 65 CAND: rb 65 BLK: rb 12 RND: rb 12 SA: rb 97 SB: rb 89 SP: rb 97 KA: rb 2 KB: rb 2 PK: rb 2 DUMMY: rb 64 SF: rb 61 PASS: rb 1
.section .text
mov PASS, 0
mov sumct, 0
mov term, 0
mov i, 0
precs_i:
cmp i, FLEN
jl tradfi
jmp tradfine
tradfi:
load t0, c5d[i]
add sumct, t0
add sumct, term
add term, paX
add i, 1
jmp precs_i
tradfine:
mod sumct, 256
mov chk, sumct
xor chk, b00ts
cmp 0, chk
jl union_work
jmp checkin
union_work:
mov i, 0
fw_init:
mov t1, i
mod t1, 61
store SF[i], t1
add i, 1
cmp i, 61
jl fw_init
mov z, paX
xor z, paX mov i, 0
fw_i:
cmp i, 64
jl fw_do
jmp checkin
fw_do:
load d, DUMMY[i]
xor d, z
store DUMMY[i], d
add i, 1
jmp fw_i
checkin:
mov offset, 0
mov bidx, 0
blk_check:
cmp offset, FLEN
jl do_block
jmp compare
do_block:
mov lenb, 0
mov i, 0
drucker0:
cmp i, BLKSZ
jl cc_check_flen
jmp cc_done
cc_check_flen:
mov t1, offset
add t1, i
cmp t1, FLEN
jl cc_copy
jmp cc_done
cc_copy:
add lenb, 1
add i, 1
jmp drucker0
cc_done:
mov i, 0
blk_copy:
cmp i, lenb
jl blk_copy_do
jmp stackfault
blk_copy_do:
mov t1, offset
add t1, i
load t2, IN[t1]
store BLK[i], t2
add i, 1
jmp blk_copy
stackfault:
mov flags, paX
mov t3, bidx
add t3, bidx
add t3, bidx
add flags, t3
add flags, 0x5A
mov t4, flags
mod t4, 2
mov use_billy, t4
mov t5, flags
mod t5, 4
mov use_roll, 0
cmp 1, t5
jl set_roll
jmp steuerfahndung
set_roll:
mov use_roll, 1
steuerfahndung:
mov billy_id, paX
mov t6, bidx
add t6, bidx
add t6, bidx
add billy_id, t6
mod billy_id, 32
load billy_idx, kallax[billy_id]
mov t0, 0
mov i7, 0
ka_i7:
cmp i7, 7
jl selfservice
jmp r8none7
selfservice:
add t0, bidx
add i7, 1
jmp ka_i7
r8none7:
mov t0b, paX
add t0b, t0
add t0b, 11
store KA[0], t0b
mov t1b, paX
xor t1b, 0xA5
store KA[1], t1b
mov t2b, 0
mov i9, 0
kb_i9:
cmp i9, 9
jl kb_add
jmp kb_done9
kb_add:
add t2b, bidx
add i9, 1
jmp kb_i9
kb_done9:
mov t2b2, paX
add t2b2, t2b
add t2b2, 23
store KB[0], t2b2
mov t3b, paX
add t3b, paX
add t3b, paX
add t3b, paX
add t3b, paX
add t3b, 0x3D
store KB[1], t3b
mov b13, 0
mov i13, 0
pk_i13:
cmp i13, 13
jl pk_add13
jmp pk_done13
pk_add13:
add b13, bidx
add i13, 1
jmp pk_i13
pk_done13:
mov pk0, paX
add pk0, b13
add pk0, 57
store PK[0], pk0
mov b17, 0
mov i17, 0
pk_i17:
cmp i17, 17
jl pk_add17
jmp pk_done17
pk_add17:
add b17, bidx
add i17, 1
jmp pk_i17
pk_done17:
mov pk1, paX
add pk1, b17
add pk1, 91
store PK[1], pk1
mov i, 0
init_SA:
mov t0, i
store SA[i], t0
add i, 1
cmp i, 97
jl init_SA
mov i, 0
mov j, 0
ksa_a:
load t0, SA[i]
load kbyte, KA[i]
add j, t0
add j, kbyte
mod j, 97
load t1, SA[j]
store SA[j], t0
store SA[i], t1
add i, 1
cmp i, 97
jl ksa_a
mov i, 0
init_SB:
mov t0, i
store SB[i], t0
add i, 1
cmp i, 89
jl init_SB
mov i, 0
mov j, 0
cult:
load t0, SB[i]
load kbyte, KB[i]
add j, t0
add j, kbyte
mod j, 89
load t1, SB[j]
store SB[j], t0
store SB[i], t1
add i, 1
cmp i, 89
jl cult
mov i, 0
mov jA, 0
mov iB, 0
mov jB, 0
mov k, 0
prga_mask:
cmp k, lenb
jl nackt
jmp stage_billy
nackt:
add i, 1
mod i, 97
load t0, SA[i]
add jA, t0
mod jA, 97
load t1, SA[jA]
store SA[jA], t0
store SA[i], t1
load t2, SA[i]
load t3, SA[jA]
add t2, t3
mod t2, 97
load kAbyte, SA[t2]
add iB, 1
mod iB, 89
load u0, SB[iB]
add jB, u0
mod jB, 89
load u1, SB[jB]
store SB[jB], u0
store SB[iB], u1
load u2, SB[iB]
load u3, SB[jB]
add u2, u3
mod u2, 89
load kBbyte, SB[u2]
load x, BLK[k]
xor x, kAbyte
xor x, kBbyte
store BLK[k], x
add k, 1
jmp prga_mask
stage_billy:
cmp 0, use_billy
jl do_billy
jmp tombola
do_billy:
mov base, 0
mov i, 0
knut:
cmp i, billy_idx
jl knut_add
jmp billy_i
knut_add:
add base, 256
add i, 1
jmp knut
billy_i:
mov i, 0
billy_do:
cmp i, lenb
jl billy_apply
jmp tombola
billy_apply:
load byte, BLK[i]
mov t0, base
add t0, byte
load t1, billy[t0]
store BLK[i], t1
add i, 1
jmp billy_do
tombola:
cmp 0, use_roll
jl do_roll
jmp stage_perm
do_roll:
mov acc, paX
mov t0, bidx
add t0, bidx
add t0, bidx
add acc, t0
add acc, 17
mov step, paX
mov t5b, bidx
add t5b, bidx
add t5b, bidx
add t5b, bidx
add t5b, bidx
add step, t5b
add step, 1
mov i, 0
roll_i:
cmp i, lenb
jl imbus
jmp stage_perm
imbus:
load x, BLK[i]
mov y, x
xor y, acc
store BLK[i], y
add acc, x
add acc, step
mod acc, 256
add i, 1
jmp roll_i
stage_perm:
mov i, 0
init_SP:
mov t0, i
store SP[i], t0
add i, 1
cmp i, 97
jl init_SP
mov i, 0
mov j, 0
ksa_sp:
load t0, SP[i]
load kbyte, PK[i]
add j, t0
add j, kbyte
mod j, 97
load t1, SP[j]
store SP[j], t0
store SP[i], t1
add i, 1
cmp i, 97
jl ksa_sp
mov i, 0
mov j, 0
mov k, 0
prga_sp:
cmp k, lenb
jl prga_sp_do
jmp permute
prga_sp_do:
add i, 1
mod i, 97
load t0, SP[i]
add j, t0
mod j, 97
load t1, SP[j]
store SP[j], t0
store SP[i], t1
load t2, SP[i]
load t3, SP[j]
add t2, t3
mod t2, 97
load t4, SP[t2]
store RND[k], t4
add k, 1
jmp prga_sp
permute:
mov idx, lenb
perm_i:
add idx, -1
cmp 0, idx
jl BADRING
jmp store_block
BADRING:j load t0, RND[idx]
mov t1, idx
add t1, 1
mod t0, t1
load a, BLK[idx]
load b, BLK[t0]
store BLK[idx], b
store BLK[t0], a
jmp perm_i
store_block:
mov i, 0
wb_i:
cmp i, lenb
jl wb_do
jmp hotdogs
wb_do:
mov t1, offset
add t1, i
load t2, BLK[i]
store CAND[t1], t2
add i, 1
jmp wb_i
hotdogs:
add offset, lenb
add bidx, 1
jmp blk_check
compare:
mov i, 0
cmp_i:
cmp i, FLEN
jl cmp_do
jmp ingrid
cmp_do:
load a, CAND[i]
load b, c5d[i]
cmp a, b
jl fail
cmp b, a
jl fail
add i, 1
jmp cmp_i
ingrid:
mov PASS, 1
jmp done
fail:
mov PASS, 0
mov z2, paX
xor z2, paX
mov pass2, 0
pn_outer:
cmp pass2, 2
jl pn_begin
jmp done
pn_begin:
mov i, 0
pn_i:
cmp i, FLEN
jl pn_do
add pass2, 1
jmp pn_outer
pn_do:
load v, CAND[i]
xor v, z2
store CAND[i], v
add i, 1
jmp pn_i
done:
halt
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment