AI generated solution for instructions unclear

solve.py

c5d = [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]
FLEN = 65
paX = 23
BLKSZ = 12
b00ts = 47

kallax = [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 = [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]

def ksa(list_len, key_bytes):
    S = list(range(list_len))
    j = 0
    klen = len(key_bytes)
    for i in range(list_len):
        kbyte = key_bytes[i % klen]
        j = (j + S[i] + kbyte) % list_len
        S[i], S[j] = S[j], S[i]
    return S

def prga_generate(S, out_len):
    i = 0
    j = 0
    out = []
    n = len(S)
    for _ in range(out_len):
        i = (i + 1) % n
        j = (j + S[i]) % n
        S[i], S[j] = S[j], S[i]
        t = (S[i] + S[j]) % n
        out.append(S[t])
    return out

billy_inv_blocks = []
for block_idx in range(4):  # 1024 / 256 = 4 blocks
    base = block_idx * 256
    block = billy[base:base+256]
    inv = [0]*256
    for orig, val in enumerate(block):
        inv[val] = orig
    billy_inv_blocks.append(inv)

def derive_KA(bidx):
    t0 = 7 * bidx
    ka0 = (paX + t0 + 11) & 0xFF
    ka1 = (paX ^ 0xA5) & 0xFF
    return [ka0, ka1]

def derive_KB(bidx):
    t2b = 9 * bidx
    kb0 = (paX + t2b + 23) & 0xFF
    kb1 = (5 * paX + 0x3D) & 0xFF
    return [kb0, kb1]

def derive_PK(bidx):
    b13 = 13 * bidx
    b17 = 17 * bidx
    pk0 = (paX + b13 + 57) & 0xFF
    pk1 = (paX + b17 + 91) & 0xFF
    return [pk0, pk1]

def compute_billy_idx(bidx):
    billy_id = (paX + 3*bidx) % 32
    return kallax[billy_id]

def inverse_transform_block(out_block, bidx):
    lenb = len(out_block)
    KA = derive_KA(bidx)
    KB = derive_KB(bidx)
    PK = derive_PK(bidx)
    flags = paX + 3*bidx + 0x5A
    use_billy = flags % 2
    t5 = flags % 4
    use_roll = 1 if (t5 > 1) else 0
    billy_idx = compute_billy_idx(bidx)
    SP = ksa(97, PK.copy())
    RND = prga_generate(SP.copy(), lenb)
    blk = out_block.copy()
    for idx in range(0, lenb):
        t0 = RND[idx] % (idx+1)
        blk[idx], blk[t0] = blk[t0], blk[idx]
    if use_roll:
        acc = (paX + 3*bidx + 17) & 0xFF
        step = (paX + 5*bidx + 1) & 0xFF
        inv_blk = []
        for i in range(lenb):
            y = blk[i]
            x = y ^ acc
            inv_blk.append(x)
            acc = (acc + x + step) & 0xFF
        blk = inv_blk
    if use_billy:
        base_idx = billy_idx
        inv_map = billy_inv_blocks[base_idx]
        blk = [inv_map[b] for b in blk]
    SA = ksa(97, KA.copy())
    SB = ksa(89, KB.copy())
    kA_stream = prga_generate(SA.copy(), lenb)
    kB_stream = prga_generate(SB.copy(), lenb)
    in_blk = []
    for i in range(lenb):
        x = blk[i] ^ kA_stream[i] ^ kB_stream[i]
        in_blk.append(x)
    return in_blk

IN = [0]*FLEN
offset = 0
bidx = 0
while offset < FLEN:
    lenb = min(BLKSZ, FLEN - offset)
    out_block = c5d[offset:offset+lenb]
    in_block = inverse_transform_block(out_block, bidx)
    IN[offset:offset+lenb] = in_block
    offset += lenb
    bidx += 1

try:
    printable = ''.join(chr(b) if 32 <= b < 127 else '.' for b in IN)
    print("Printable:", printable)
except:
    pass