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ctf2018-第8题
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发表于: 2018-7-1 13:54 2732
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进制转换36/62/64/256
struct buf { BYTE len0; BYTE len0_1; // len0_1 ==len0+4 BYTE len1; BYTE len2; BYTE r0[len0+4]; BYTE r1[len1]; BYTE r2[len2]; }; .text:00401A19 mov al, [edx] .text:00401A1B cmp al, 1 .text:00401A1D jb loc_4023E6 .text:00401A23 cmp al, 18h .text:00401A25 ja loc_4023E6 .text:00401A2B mov cl, [edx+1] .text:00401A2E cmp cl, 1 .text:00401A31 mov byte ptr [ebp+var_14], cl .text:00401A34 jb loc_4023E6 .text:00401A3A cmp cl, 18h .text:00401A3D ja loc_4023E6 .text:00401A43 mov bl, [edx+2] .text:00401A46 cmp bl, 1 .text:00401A49 jb loc_4023E6 .text:00401A4F cmp bl, 18h .text:00401A52 ja loc_4023E6 .text:00401A58 mov cl, [edx+3] .text:00401A5B cmp cl, 1 .text:00401A5E jb loc_4023E6 .text:00401A64 cmp cl, 18h .text:00401A67 ja loc_4023E6 .text:00401A6D mov esi, [ebp+var_14] .text:00401A70 and eax, 0FFh .text:00401A75 and esi, 0FFh .text:00401A7B lea edx, [eax+4] .text:00401A7E cmp edx, esi .text:00401A80 jnz loc_4023E6 .text:00401A86 and ecx, 0FFh .text:00401A8C and ebx, 0FFh .text:00401A92 add eax, ecx .text:00401A94 mov ecx, [ebp+var_2C] .text:00401A97 mov edx, [ecx+8] .text:00401A9A lea eax, [ebx+eax+8] .text:00401A9E cmp eax, edx .text:00401AA0 jnz loc_4023E6
struct buf { BYTE len0; BYTE len0_1; // len0_1 ==len0+4 BYTE len1; BYTE len2; BYTE r0[len0+4]; BYTE r1[len1]; BYTE r2[len2]; }; .text:00401A19 mov al, [edx] .text:00401A1B cmp al, 1 .text:00401A1D jb loc_4023E6 .text:00401A23 cmp al, 18h .text:00401A25 ja loc_4023E6 .text:00401A2B mov cl, [edx+1] .text:00401A2E cmp cl, 1 .text:00401A31 mov byte ptr [ebp+var_14], cl .text:00401A34 jb loc_4023E6 .text:00401A3A cmp cl, 18h .text:00401A3D ja loc_4023E6 .text:00401A43 mov bl, [edx+2] .text:00401A46 cmp bl, 1 .text:00401A49 jb loc_4023E6 .text:00401A4F cmp bl, 18h .text:00401A52 ja loc_4023E6 .text:00401A58 mov cl, [edx+3] .text:00401A5B cmp cl, 1 .text:00401A5E jb loc_4023E6 .text:00401A64 cmp cl, 18h .text:00401A67 ja loc_4023E6 .text:00401A6D mov esi, [ebp+var_14] .text:00401A70 and eax, 0FFh .text:00401A75 and esi, 0FFh .text:00401A7B lea edx, [eax+4] .text:00401A7E cmp edx, esi .text:00401A80 jnz loc_4023E6 .text:00401A86 and ecx, 0FFh .text:00401A8C and ebx, 0FFh .text:00401A92 add eax, ecx .text:00401A94 mov ecx, [ebp+var_2C] .text:00401A97 mov edx, [ecx+8] .text:00401A9A lea eax, [ebx+eax+8] .text:00401A9E cmp eax, edx .text:00401AA0 jnz loc_4023E6
v1=g_bn1, v2=g_bn2
.text:00401D21 push offset aWelcomeToBbsPe ; "welcome to bbs.pediy.com." .text:00401D26 push offset g_bn1 .text:00401D2B call x_from_basen .text:00401D30 mov edi, offset a0123456789abcd_0 ; .text:00401D35 or ecx, 0FFFFFFFFh .text:00401D38 xor eax, eax .text:00401D3A push 2Bh .text:00401D3C repne scasb .text:00401D3E not ecx .text:00401D40 push 2Dh .text:00401D42 dec ecx .text:00401D43 push offset a0123456789abcd_0 ; .text:00401D48 push ecx .text:00401D49 mov edi, offset aAuthorByLookhc ; "Author by Lookhc" .text:00401D4E or ecx, 0FFFFFFFFh .text:00401D51 repne scasb .text:00401D53 not ecx .text:00401D55 dec ecx .text:00401D56 push ecx .text:00401D57 push offset aAuthorByLookhc ; "Author by Lookhc" .text:00401D5C push offset g_bn2 .text:00401D61 call x_from_basen
.text:00401D21 push offset aWelcomeToBbsPe ; "welcome to bbs.pediy.com." .text:00401D26 push offset g_bn1 .text:00401D2B call x_from_basen .text:00401D30 mov edi, offset a0123456789abcd_0 ; .text:00401D35 or ecx, 0FFFFFFFFh .text:00401D38 xor eax, eax .text:00401D3A push 2Bh .text:00401D3C repne scasb .text:00401D3E not ecx .text:00401D40 push 2Dh .text:00401D42 dec ecx .text:00401D43 push offset a0123456789abcd_0 ; .text:00401D48 push ecx .text:00401D49 mov edi, offset aAuthorByLookhc ; "Author by Lookhc" .text:00401D4E or ecx, 0FFFFFFFFh .text:00401D51 repne scasb .text:00401D53 not ecx .text:00401D55 dec ecx .text:00401D56 push ecx .text:00401D57 push offset aAuthorByLookhc ; "Author by Lookhc" .text:00401D5C push offset g_bn2 .text:00401D61 call x_from_basen
校验r0[len0]
.text:00401DEB mov edx, [ebp+var_38] .text:00401DEE lea eax, [ebp+var_44] ; must return 1 .text:00401DF1 lea ecx, [ebp+var_3C] ; must return 0 .text:00401DF4 push eax .text:00401DF5 push ecx .text:00401DF6 mov edi, edx .text:00401DF8 or ecx, 0FFFFFFFFh .text:00401DFB xor eax, eax .text:00401DFD mov [ebp+var_3C], 64h .text:00401E04 mov [ebp+var_44], 0 .text:00401E0B repne scasb .text:00401E0D not ecx .text:00401E0F dec ecx .text:00401E10 push 5 .text:00401E12 push ecx .text:00401E13 push edx .text:00401E14 call sub_4010A0 ; must return 1
校验buf的crc
.text:00401E29 push ecx .text:00401E2A push edx .text:00401E2B push offset loc_401ABF .text:00401E30 push 6780h .text:00401E35 push 13114F0Dh .text:00401E3A push 1F6E1EA0h .text:00401E3F call sub_404A60 ; crc32(buf, 0) == 0 .text:00401E44 add esp, 1Ch .text:00401E47 mov [ebp+lpMem], eax ; must be 0
这个循环会校验 r0^n == r1^n+r2^n (n: 3~9), 这个肯定不成立
.text:00401EF2 cmp eax, 0Ah .text:00401EF5 jge loc_40210F .text:00401EFB test eax, eax .text:00401EFD jnz short loc_401F30 ... .text:004020FF call bn_compare .text:00402104 test eax, eax .text:00402106 jnz loc_4022E9 ; always jmp
异常处理
.text:004022E9 mov eax, [ebp+var_3C] ; must be 0 .text:004022EC test eax, eax .text:004022EE jnz short loc_402305 .text:004022F0 lea eax, [ebp+var_48] .text:004022F3 push offset __TI1H ; throw info for 'int' .text:004022F8 push eax .text:004022F9 mov [ebp+var_48], 1 .text:00402300 call __CxxThrowException@8 ; _CxxThrowException(x,x) .text:00402367 ; catch(...) // owned by 401EE8 .text:00402367 mov dword ptr [ebp-30h], 2 .text:0040236E mov eax, offset loc_40211C .text:00402373 retn .text:0040211C mov eax, [ebp-30h] .text:0040211F mov [ebp+var_4], 0FFFFFFFFh .text:00402126 cmp eax, 2 .text:00402129 jnz loc_402399
r1-r2=bn2
2*r1+4*r2=bn1
.text:00402189 call bn_add ... .text:004021BB call bn_compare .text:004021CE push 4 .text:004021D0 push edx .text:004021D1 call bn_int ... .text:004021F5 call bn_mul .text:004021FA lea ecx, [ebp+var_1970] .text:00402200 push 2 .text:00402202 push ecx .text:00402203 call bn_int ... .text:00402226 call bn_mul .text:0040222B mov ecx, 84h .text:00402230 mov esi, offset g_bn1 ... .text:0040225F call bn_add ... .text:0040228D call bn_rebase
crc32_table = [ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL ] crc32_table_highest_byte_map = [-1] * 256 for i in range(256): crc32_table_highest_byte_map[(crc32_table[i] >> 24) & 0xFF] = i def array_to_int(k, base): v = 0 n = 1 for _ in k: v += n * _ n *= base return v def int_to_array(v, base): r = [] while v != 0: r.append(v % base) v = v / base return r def str_to_int(s, char_map): # type:(str,str) -> int r = [] for _ in s: r.append(char_map.find(_)) return array_to_int(r, len(char_map)) def int_to_str(v, char_map): # type:(int,str) -> str r = int_to_array(v, len(char_map)) s = '' for _ in r: s = char_map[_] + s return s def print_array(r): s = '' for _ in r: s += ('%x' % _).zfill(2) + ' ' print s return def print_int(v, base): r = int_to_array(v, base) print_array(r) return def array_to_str(k): s = '' for _ in k: s += chr(_) return s def str_to_array(s): k = [] for _ in s: k.append(ord(s)) return k def crc32_update(k, crc): for b in k: crc = (crc >> 8) ^ crc32_table[b ^ (crc & 0xFF)] return crc def get_crc32_update_init_value(k, crc): z = len(k) - 1 while z >= 0: idx = crc32_table_highest_byte_map[(crc >> 24) & 0xFF] crc = ((crc32_table[idx] ^ crc) << 8) | (idx ^ k[z]) z -= 1 return crc def crc32(k, crc_init=0): crc = crc_init crc = (~crc) & 0xFFFFFFFF crc = crc32_update(k, crc) crc = (~crc) & 0xFFFFFFFF return crc def crc_RF(x): return crc32_table_highest_byte_map[x] def crc_F(x): return (crc32_table[x] >> 24) & 0xFF def crc_G(x): return (crc32_table[x] >> 16) & 0xFF def crc_H(x): return (crc32_table[x] >> 8) & 0xFF def crc_I(x): return (crc32_table[x] >> 0) & 0xFF def crack_crc(s_head, s_tail, crc_init, crc_final): crc1 = (~crc_init) & 0xFFFFFFFF crc1 = crc32_update(s_head, crc1) crc2 = (~crc_final) & 0xFFFFFFFF crc2 = get_crc32_update_init_value(s_tail, crc2) # hxxps://bbs.pediy.com/thread-8699.htm W = (crc2 >> 24) & 0xFF X = (crc2 >> 16) & 0xFF Y = (crc2 >> 8) & 0xFF Z = (crc2 >> 0) & 0xFF A = (crc1 >> 24) & 0xFF B = (crc1 >> 16) & 0xFF C = (crc1 >> 8) & 0xFF D = (crc1 >> 0) & 0xFF p = crc_RF(W) o = crc_RF(X ^ crc_G(p)) n = crc_RF(Y ^ crc_G(o) ^ crc_H(p)) m = crc_RF(Z ^ crc_G(n) ^ crc_H(o) ^ crc_I(p)) d = m ^ D c = n ^ C ^ crc_I(m) b = o ^ B ^ crc_H(m) ^ crc_I(n) a = p ^ A ^ crc_G(m) ^ crc_H(n) ^ crc_I(o) return [d, c, b, a] def check_crc_table(): print('xxstart') k3 = [0] * 256 k2 = [0] * 256 k1 = [0] * 256 k0 = [0] * 256 for _ in range(256): k3[(crc32_table[_] >> 24) & 0xFF] += 1 k2[(crc32_table[_] >> 16) & 0xFF] += 1 k1[(crc32_table[_] >> 8) & 0xFF] += 1 k0[(crc32_table[_] >> 0) & 0xFF] += 1 for _ in range(256): if k3[_] != 1: print('k3[%s]=%s' % (_, k3[_])) # if k2[_] != 1: # print('k2[%s]=%s' % (_, k2[_])) # if k1[_] != 1: # print('k1[%s]=%s' % (_, k1[_])) # if k0[_] != 1: # print('k0[%s]=%s' % (_, k0[_])) print('xxend') return def x_401080(v): if v == 0: return 0 r = 1 while (v & 1) == 0: v >>= 1 r *= 2 if v == 0: return 0 return r def x_4010A0(buf, bits): a1 = 0 buf_len = (1 << bits) - 1 v_cnt0 = buf_len v_cnt1 = 0 v_cnt2 = 0 _ = 0 for _ in range(buf_len): c = buf[_] v_cnt0_v = x_401080(v_cnt0) v_cnt1_v = x_401080(v_cnt1) v_cnt2_v = x_401080(v_cnt2) _v_cnt0_v = v_cnt0_v if v_cnt0_v != 0 else 100 _v_cnt1_v = v_cnt1_v if v_cnt1_v != 0 else 100 _v_cnt2_v = v_cnt2_v if v_cnt2_v != 0 else 100 if c == 0: if _v_cnt0_v >= _v_cnt1_v: break v_cnt0 -= v_cnt0_v v_cnt1 += v_cnt0_v a1 = v_cnt0_v elif c == 1: if _v_cnt0_v >= _v_cnt2_v: break v_cnt0 -= v_cnt0_v v_cnt2 += v_cnt0_v a1 = v_cnt0_v elif c == 2: if _v_cnt1_v >= _v_cnt0_v: break v_cnt0 += v_cnt1_v v_cnt1 -= v_cnt1_v a1 = v_cnt1_v elif c == 3: if _v_cnt1_v >= _v_cnt2_v: break v_cnt1 -= v_cnt1_v v_cnt2 += v_cnt1_v a1 = v_cnt1_v elif c == 4: if _v_cnt2_v >= _v_cnt0_v: break v_cnt0 += v_cnt2_v v_cnt2 -= v_cnt2_v a1 = v_cnt2_v elif c == 5: if _v_cnt2_v >= _v_cnt1_v: break v_cnt1 += v_cnt2_v v_cnt2 -= v_cnt2_v a1 = v_cnt2_v r = False a0 = v_cnt0 if _ == (buf_len - 1) and a0 == 0 and a1 == 1: r = True return [r, a0, a1] def x_crack_part1_raw(buf, offset, cond0, cond1, vct_max, strict=False): bits = 5 # buf[(1 << bits) - 1] == 0 i7_end = 6 if (offset != 0x18) else 1 vct = [] for i0 in range(6): for i1 in range(6): for i2 in range(6): for i3 in range(6): for i4 in range(6): for i5 in range(6): for i6 in range(6): for i7 in range(i7_end): buf[offset + 0] = i0 buf[offset + 1] = i1 buf[offset + 2] = i2 buf[offset + 3] = i3 buf[offset + 4] = i4 buf[offset + 5] = i5 buf[offset + 6] = i6 buf[offset + 7] = i7 r, a_0, a_1 = x_4010A0(buf, bits) if strict: ok = r else: ok = a_0 <= cond0 and (cond1 < 0 or a_1 <= cond1) if ok: v = [i0, i1, i2, i3, i4, i5, i6, i7] if strict: print('(%s): %s' % (len(vct), v)) vct.append(v) if (vct_max > 0) and (len(vct) >= vct_max): return vct return vct def x_crack_part1(count, use_cache=True): buf = [0] * 32 print('crack_part1 0:8') offset = 0 if use_cache: vct0 = [[0, 1, 3, 0, 4, 5, 0, 1], ] else: vct0 = x_crack_part1_raw(buf, offset, 0x10, -1, 1) print vct0 for _ in range(8): buf[offset + _] = vct0[0][_] print('crack_part1 8:0x10') offset += 8 if use_cache: vct1 = [[2, 1, 2, 4, 3, 0, 1, 3], ] else: vct1 = x_crack_part1_raw(buf, offset, 0x0F, -1, 1) print vct1 for _ in range(8): buf[offset + _] = vct1[0][_] print('crack_part1 0x10:0x18') offset += 8 if use_cache: vct2 = [[0, 2, 0, 2, 0, 2, 0, 4], ] else: vct2 = x_crack_part1_raw(buf, offset, 0, 1, 1) print vct2 for _ in range(8): buf[offset + _] = vct2[0][_] print('crack_part1 0x18:0x20') offset += 8 vct3 = x_crack_part1_raw(buf, offset, 0, 1, count, strict=True) r = [] for a in range(len(vct3)): v = [_ for _ in buf] for b in range(8): v[offset + b] = vct3[a][b] # print_array(v) r.append(v) return r def x_gen_sn(k): # char_map36 = 'abcdefghijklmnopqrstuvwxyz0123456789' char_map62 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' char_map64 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. ' r0_0 = [] for _ in range(0, len(k), 2): r0_0 = [k[_ + 1] * 6 + k[_], ] + r0_0 v = array_to_int(r0_0, 36) # print_int(v, 36) # print int_to_str(v, char_map36) r0_0 = int_to_array(v, 256) r0_1 = [-1] * 4 r0 = r0_0 + r0_1 v1 = str_to_int('welcome to bbs.pediy.com.'[::-1], char_map64) v2 = str_to_int('Author by Lookhc'[::-1], char_map64) y = (v1 - v2 * 2) / 6 x = y + v2 r1 = int_to_array(x, 256) r2 = int_to_array(y, 256) k = [len(r0) - 4, len(r0), len(r1), len(r2)] + r0 + r1 + r2 r0_1 = crack_crc(k[0:len(r0)], k[4 + len(r0):], 0, 0) r0 = r0_0 + r0_1 k = [len(r0) - 4, len(r0), len(r1), len(r2)] + r0 + r1 + r2 print int_to_str(array_to_int(k, 256), char_map62) return def test(): # count = 256 count = 2 ks = x_crack_part1(count, use_cache=True) for _ in range(len(ks)): x_gen_sn(ks[_]) return test()
.text:00401DEB mov edx, [ebp+var_38] .text:00401DEE lea eax, [ebp+var_44] ; must return 1 .text:00401DF1 lea ecx, [ebp+var_3C] ; must return 0 .text:00401DF4 push eax .text:00401DF5 push ecx .text:00401DF6 mov edi, edx .text:00401DF8 or ecx, 0FFFFFFFFh .text:00401DFB xor eax, eax .text:00401DFD mov [ebp+var_3C], 64h .text:00401E04 mov [ebp+var_44], 0 .text:00401E0B repne scasb .text:00401E0D not ecx .text:00401E0F dec ecx .text:00401E10 push 5 .text:00401E12 push ecx .text:00401E13 push edx .text:00401E14 call sub_4010A0 ; must return 1
校验buf的crc
.text:00401E29 push ecx .text:00401E2A push edx .text:00401E2B push offset loc_401ABF .text:00401E30 push 6780h .text:00401E35 push 13114F0Dh .text:00401E3A push 1F6E1EA0h .text:00401E3F call sub_404A60 ; crc32(buf, 0) == 0 .text:00401E44 add esp, 1Ch .text:00401E47 mov [ebp+lpMem], eax ; must be 0
.text:00401E29 push ecx .text:00401E2A push edx .text:00401E2B push offset loc_401ABF .text:00401E30 push 6780h .text:00401E35 push 13114F0Dh .text:00401E3A push 1F6E1EA0h .text:00401E3F call sub_404A60 ; crc32(buf, 0) == 0 .text:00401E44 add esp, 1Ch .text:00401E47 mov [ebp+lpMem], eax ; must be 0
这个循环会校验 r0^n == r1^n+r2^n (n: 3~9), 这个肯定不成立
.text:00401EF2 cmp eax, 0Ah .text:00401EF5 jge loc_40210F .text:00401EFB test eax, eax .text:00401EFD jnz short loc_401F30 ... .text:004020FF call bn_compare .text:00402104 test eax, eax .text:00402106 jnz loc_4022E9 ; always jmp
异常处理
.text:004022E9 mov eax, [ebp+var_3C] ; must be 0 .text:004022EC test eax, eax .text:004022EE jnz short loc_402305 .text:004022F0 lea eax, [ebp+var_48] .text:004022F3 push offset __TI1H ; throw info for 'int' .text:004022F8 push eax .text:004022F9 mov [ebp+var_48], 1 .text:00402300 call __CxxThrowException@8 ; _CxxThrowException(x,x) .text:00402367 ; catch(...) // owned by 401EE8 .text:00402367 mov dword ptr [ebp-30h], 2 .text:0040236E mov eax, offset loc_40211C .text:00402373 retn .text:0040211C mov eax, [ebp-30h] .text:0040211F mov [ebp+var_4], 0FFFFFFFFh .text:00402126 cmp eax, 2 .text:00402129 jnz loc_402399
r1-r2=bn2
2*r1+4*r2=bn1
.text:00402189 call bn_add ... .text:004021BB call bn_compare .text:004021CE push 4 .text:004021D0 push edx .text:004021D1 call bn_int ... .text:004021F5 call bn_mul .text:004021FA lea ecx, [ebp+var_1970] .text:00402200 push 2 .text:00402202 push ecx .text:00402203 call bn_int ... .text:00402226 call bn_mul .text:0040222B mov ecx, 84h .text:00402230 mov esi, offset g_bn1 ... .text:0040225F call bn_add ... .text:0040228D call bn_rebase
crc32_table = [ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL ] crc32_table_highest_byte_map = [-1] * 256 for i in range(256): crc32_table_highest_byte_map[(crc32_table[i] >> 24) & 0xFF] = i def array_to_int(k, base): v = 0 n = 1 for _ in k: v += n * _ n *= base return v def int_to_array(v, base): r = [] while v != 0: r.append(v % base) v = v / base return r def str_to_int(s, char_map): # type:(str,str) -> int r = [] for _ in s: r.append(char_map.find(_)) return array_to_int(r, len(char_map)) def int_to_str(v, char_map): # type:(int,str) -> str r = int_to_array(v, len(char_map)) s = '' for _ in r: s = char_map[_] + s return s def print_array(r): s = '' for _ in r: s += ('%x' % _).zfill(2) + ' ' print s return def print_int(v, base): r = int_to_array(v, base) print_array(r) return def array_to_str(k): s = '' for _ in k: s += chr(_) return s def str_to_array(s): k = [] for _ in s: k.append(ord(s)) return k def crc32_update(k, crc): for b in k: crc = (crc >> 8) ^ crc32_table[b ^ (crc & 0xFF)] return crc def get_crc32_update_init_value(k, crc): z = len(k) - 1 while z >= 0: idx = crc32_table_highest_byte_map[(crc >> 24) & 0xFF] crc = ((crc32_table[idx] ^ crc) << 8) | (idx ^ k[z]) z -= 1 return crc def crc32(k, crc_init=0): crc = crc_init crc = (~crc) & 0xFFFFFFFF crc = crc32_update(k, crc) crc = (~crc) & 0xFFFFFFFF return crc def crc_RF(x): return crc32_table_highest_byte_map[x] def crc_F(x): return (crc32_table[x] >> 24) & 0xFF def crc_G(x): return (crc32_table[x] >> 16) & 0xFF def crc_H(x): return (crc32_table[x] >> 8) & 0xFF def crc_I(x): return (crc32_table[x] >> 0) & 0xFF def crack_crc(s_head, s_tail, crc_init, crc_final): crc1 = (~crc_init) & 0xFFFFFFFF crc1 = crc32_update(s_head, crc1) crc2 = (~crc_final) & 0xFFFFFFFF crc2 = get_crc32_update_init_value(s_tail, crc2) # hxxps://bbs.pediy.com/thread-8699.htm W = (crc2 >> 24) & 0xFF X = (crc2 >> 16) & 0xFF Y = (crc2 >> 8) & 0xFF Z = (crc2 >> 0) & 0xFF A = (crc1 >> 24) & 0xFF B = (crc1 >> 16) & 0xFF C = (crc1 >> 8) & 0xFF D = (crc1 >> 0) & 0xFF p = crc_RF(W) o = crc_RF(X ^ crc_G(p)) n = crc_RF(Y ^ crc_G(o) ^ crc_H(p)) m = crc_RF(Z ^ crc_G(n) ^ crc_H(o) ^ crc_I(p)) d = m ^ D c = n ^ C ^ crc_I(m) b = o ^ B ^ crc_H(m) ^ crc_I(n) a = p ^ A ^ crc_G(m) ^ crc_H(n) ^ crc_I(o) return [d, c, b, a] def check_crc_table(): print('xxstart') k3 = [0] * 256 k2 = [0] * 256 k1 = [0] * 256 k0 = [0] * 256 for _ in range(256): k3[(crc32_table[_] >> 24) & 0xFF] += 1 k2[(crc32_table[_] >> 16) & 0xFF] += 1 k1[(crc32_table[_] >> 8) & 0xFF] += 1 k0[(crc32_table[_] >> 0) & 0xFF] += 1 for _ in range(256): if k3[_] != 1: print('k3[%s]=%s' % (_, k3[_])) # if k2[_] != 1: # print('k2[%s]=%s' % (_, k2[_])) # if k1[_] != 1: # print('k1[%s]=%s' % (_, k1[_])) # if k0[_] != 1: # print('k0[%s]=%s' % (_, k0[_])) print('xxend') return def x_401080(v): if v == 0: return 0 r = 1 while (v & 1) == 0: v >>= 1 r *= 2 if v == 0: return 0 return r def x_4010A0(buf, bits): a1 = 0 buf_len = (1 << bits) - 1 v_cnt0 = buf_len v_cnt1 = 0 v_cnt2 = 0 _ = 0 for _ in range(buf_len): c = buf[_] v_cnt0_v = x_401080(v_cnt0) v_cnt1_v = x_401080(v_cnt1) v_cnt2_v = x_401080(v_cnt2) _v_cnt0_v = v_cnt0_v if v_cnt0_v != 0 else 100 _v_cnt1_v = v_cnt1_v if v_cnt1_v != 0 else 100 _v_cnt2_v = v_cnt2_v if v_cnt2_v != 0 else 100 if c == 0: if _v_cnt0_v >= _v_cnt1_v: break v_cnt0 -= v_cnt0_v v_cnt1 += v_cnt0_v a1 = v_cnt0_v elif c == 1: if _v_cnt0_v >= _v_cnt2_v: break v_cnt0 -= v_cnt0_v v_cnt2 += v_cnt0_v a1 = v_cnt0_v elif c == 2: if _v_cnt1_v >= _v_cnt0_v: break v_cnt0 += v_cnt1_v v_cnt1 -= v_cnt1_v a1 = v_cnt1_v elif c == 3: if _v_cnt1_v >= _v_cnt2_v: break v_cnt1 -= v_cnt1_v v_cnt2 += v_cnt1_v a1 = v_cnt1_v elif c == 4: if _v_cnt2_v >= _v_cnt0_v: break v_cnt0 += v_cnt2_v v_cnt2 -= v_cnt2_v a1 = v_cnt2_v elif c == 5: if _v_cnt2_v >= _v_cnt1_v: break v_cnt1 += v_cnt2_v v_cnt2 -= v_cnt2_v a1 = v_cnt2_v r = False a0 = v_cnt0 if _ == (buf_len - 1) and a0 == 0 and a1 == 1: r = True return [r, a0, a1] def x_crack_part1_raw(buf, offset, cond0, cond1, vct_max, strict=False): bits = 5 # buf[(1 << bits) - 1] == 0 i7_end = 6 if (offset != 0x18) else 1 vct = [] for i0 in range(6): for i1 in range(6): for i2 in range(6): for i3 in range(6): for i4 in range(6): for i5 in range(6): for i6 in range(6): for i7 in range(i7_end): buf[offset + 0] = i0 buf[offset + 1] = i1 buf[offset + 2] = i2 buf[offset + 3] = i3 buf[offset + 4] = i4 buf[offset + 5] = i5 buf[offset + 6] = i6 buf[offset + 7] = i7 r, a_0, a_1 = x_4010A0(buf, bits) if strict: ok = r else: ok = a_0 <= cond0 and (cond1 < 0 or a_1 <= cond1) if ok: v = [i0, i1, i2, i3, i4, i5, i6, i7] if strict: print('(%s): %s' % (len(vct), v)) vct.append(v) if (vct_max > 0) and (len(vct) >= vct_max): return vct return vct def x_crack_part1(count, use_cache=True): buf = [0] * 32 print('crack_part1 0:8') offset = 0 if use_cache: vct0 = [[0, 1, 3, 0, 4, 5, 0, 1], ] else: vct0 = x_crack_part1_raw(buf, offset, 0x10, -1, 1) print vct0 for _ in range(8): buf[offset + _] = vct0[0][_] print('crack_part1 8:0x10') offset += 8 if use_cache: vct1 = [[2, 1, 2, 4, 3, 0, 1, 3], ] else: vct1 = x_crack_part1_raw(buf, offset, 0x0F, -1, 1) print vct1 for _ in range(8): buf[offset + _] = vct1[0][_] print('crack_part1 0x10:0x18') offset += 8 if use_cache: vct2 = [[0, 2, 0, 2, 0, 2, 0, 4], ] else: vct2 = x_crack_part1_raw(buf, offset, 0, 1, 1) print vct2 for _ in range(8): buf[offset + _] = vct2[0][_] print('crack_part1 0x18:0x20') offset += 8 vct3 = x_crack_part1_raw(buf, offset, 0, 1, count, strict=True) r = [] for a in range(len(vct3)): v = [_ for _ in buf] for b in range(8): v[offset + b] = vct3[a][b] # print_array(v) r.append(v) return r def x_gen_sn(k): # char_map36 = 'abcdefghijklmnopqrstuvwxyz0123456789' char_map62 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' char_map64 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. ' r0_0 = [] for _ in range(0, len(k), 2): r0_0 = [k[_ + 1] * 6 + k[_], ] + r0_0 v = array_to_int(r0_0, 36) # print_int(v, 36) # print int_to_str(v, char_map36) r0_0 = int_to_array(v, 256) r0_1 = [-1] * 4 r0 = r0_0 + r0_1 v1 = str_to_int('welcome to bbs.pediy.com.'[::-1], char_map64) v2 = str_to_int('Author by Lookhc'[::-1], char_map64) y = (v1 - v2 * 2) / 6 x = y + v2 r1 = int_to_array(x, 256) r2 = int_to_array(y, 256) k = [len(r0) - 4, len(r0), len(r1), len(r2)] + r0 + r1 + r2 r0_1 = crack_crc(k[0:len(r0)], k[4 + len(r0):], 0, 0) r0 = r0_0 + r0_1 k = [len(r0) - 4, len(r0), len(r1), len(r2)] + r0 + r1 + r2 print int_to_str(array_to_int(k, 256), char_map62) return def test(): # count = 256 count = 2 ks = x_crack_part1(count, use_cache=True) for _ in range(len(ks)): x_gen_sn(ks[_]) return test()
.text:00401EF2 cmp eax, 0Ah .text:00401EF5 jge loc_40210F .text:00401EFB test eax, eax .text:00401EFD jnz short loc_401F30 ... .text:004020FF call bn_compare .text:00402104 test eax, eax .text:00402106 jnz loc_4022E9 ; always jmp
异常处理
.text:004022E9 mov eax, [ebp+var_3C] ; must be 0 .text:004022EC test eax, eax .text:004022EE jnz short loc_402305 .text:004022F0 lea eax, [ebp+var_48] .text:004022F3 push offset __TI1H ; throw info for 'int' .text:004022F8 push eax .text:004022F9 mov [ebp+var_48], 1 .text:00402300 call __CxxThrowException@8 ; _CxxThrowException(x,x) .text:00402367 ; catch(...) // owned by 401EE8 .text:00402367 mov dword ptr [ebp-30h], 2 .text:0040236E mov eax, offset loc_40211C .text:00402373 retn .text:0040211C mov eax, [ebp-30h] .text:0040211F mov [ebp+var_4], 0FFFFFFFFh .text:00402126 cmp eax, 2 .text:00402129 jnz loc_402399
r1-r2=bn2
2*r1+4*r2=bn1
.text:00402189 call bn_add ... .text:004021BB call bn_compare .text:004021CE push 4 .text:004021D0 push edx .text:004021D1 call bn_int ... .text:004021F5 call bn_mul .text:004021FA lea ecx, [ebp+var_1970] .text:00402200 push 2 .text:00402202 push ecx .text:00402203 call bn_int ... .text:00402226 call bn_mul .text:0040222B mov ecx, 84h .text:00402230 mov esi, offset g_bn1 ... .text:0040225F call bn_add ... .text:0040228D call bn_rebase
crc32_table = [ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 0x2d02ef8dL ] crc32_table_highest_byte_map = [-1] * 256 for i in range(256): crc32_table_highest_byte_map[(crc32_table[i] >> 24) & 0xFF] = i def array_to_int(k, base): v = 0 n = 1 for _ in k: v += n * _ n *= base return v def int_to_array(v, base): r = [] while v != 0: r.append(v % base) v = v / base return r def str_to_int(s, char_map): # type:(str,str) -> int r = [] for _ in s: r.append(char_map.find(_)) return array_to_int(r, len(char_map)) def int_to_str(v, char_map): # type:(int,str) -> str r = int_to_array(v, len(char_map)) s = '' for _ in r: s = char_map[_] + s return s def print_array(r): s = '' for _ in r: s += ('%x' % _).zfill(2) + ' ' print s return def print_int(v, base): r = int_to_array(v, base) print_array(r) return def array_to_str(k): s = '' for _ in k: s += chr(_) return s def str_to_array(s): k = [] for _ in s: k.append(ord(s)) return k def crc32_update(k, crc): for b in k: crc = (crc >> 8) ^ crc32_table[b ^ (crc & 0xFF)] return crc def get_crc32_update_init_value(k, crc): z = len(k) - 1 while z >= 0: idx = crc32_table_highest_byte_map[(crc >> 24) & 0xFF] crc = ((crc32_table[idx] ^ crc) << 8) | (idx ^ k[z]) z -= 1 return crc def crc32(k, crc_init=0): crc = crc_init crc = (~crc) & 0xFFFFFFFF crc = crc32_update(k, crc) crc = (~crc) & 0xFFFFFFFF return crc def crc_RF(x): return crc32_table_highest_byte_map[x] def crc_F(x): return (crc32_table[x] >> 24) & 0xFF def crc_G(x): return (crc32_table[x] >> 16) & 0xFF def crc_H(x): return (crc32_table[x] >> 8) & 0xFF def crc_I(x): return (crc32_table[x] >> 0) & 0xFF def crack_crc(s_head, s_tail, crc_init, crc_final): crc1 = (~crc_init) & 0xFFFFFFFF crc1 = crc32_update(s_head, crc1) crc2 = (~crc_final) & 0xFFFFFFFF crc2 = get_crc32_update_init_value(s_tail, crc2) # hxxps://bbs.pediy.com/thread-8699.htm W = (crc2 >> 24) & 0xFF X = (crc2 >> 16) & 0xFF Y = (crc2 >> 8) & 0xFF Z = (crc2 >> 0) & 0xFF A = (crc1 >> 24) & 0xFF B = (crc1 >> 16) & 0xFF C = (crc1 >> 8) & 0xFF D = (crc1 >> 0) & 0xFF p = crc_RF(W) o = crc_RF(X ^ crc_G(p)) n = crc_RF(Y ^ crc_G(o) ^ crc_H(p)) m = crc_RF(Z ^ crc_G(n) ^ crc_H(o) ^ crc_I(p)) d = m ^ D c = n ^ C ^ crc_I(m) b = o ^ B ^ crc_H(m) ^ crc_I(n) a = p ^ A ^ crc_G(m) ^ crc_H(n) ^ crc_I(o) return [d, c, b, a] def check_crc_table(): print('xxstart') k3 = [0] * 256 k2 = [0] * 256 k1 = [0] * 256 k0 = [0] * 256 for _ in range(256): k3[(crc32_table[_] >> 24) & 0xFF] += 1 k2[(crc32_table[_] >> 16) & 0xFF] += 1 k1[(crc32_table[_] >> 8) & 0xFF] += 1 k0[(crc32_table[_] >> 0) & 0xFF] += 1 for _ in range(256): if k3[_] != 1: print('k3[%s]=%s' % (_, k3[_])) # if k2[_] != 1: # print('k2[%s]=%s' % (_, k2[_])) # if k1[_] != 1: # print('k1[%s]=%s' % (_, k1[_])) # if k0[_] != 1: # print('k0[%s]=%s' % (_, k0[_])) print('xxend') return def x_401080(v): if v == 0: return 0 r = 1 while (v & 1) == 0: v >>= 1 r *= 2 if v == 0: return 0 return r def x_4010A0(buf, bits): a1 = 0 buf_len = (1 << bits) - 1 v_cnt0 = buf_len v_cnt1 = 0 v_cnt2 = 0 _ = 0 for _ in range(buf_len): c = buf[_] v_cnt0_v = x_401080(v_cnt0) v_cnt1_v = x_401080(v_cnt1) v_cnt2_v = x_401080(v_cnt2) _v_cnt0_v = v_cnt0_v if v_cnt0_v != 0 else 100 _v_cnt1_v = v_cnt1_v if v_cnt1_v != 0 else 100 _v_cnt2_v = v_cnt2_v if v_cnt2_v != 0 else 100 if c == 0: if _v_cnt0_v >= _v_cnt1_v: break v_cnt0 -= v_cnt0_v v_cnt1 += v_cnt0_v a1 = v_cnt0_v elif c == 1: if _v_cnt0_v >= _v_cnt2_v: break v_cnt0 -= v_cnt0_v v_cnt2 += v_cnt0_v a1 = v_cnt0_v elif c == 2: if _v_cnt1_v >= _v_cnt0_v: break v_cnt0 += v_cnt1_v v_cnt1 -= v_cnt1_v a1 = v_cnt1_v elif c == 3: if _v_cnt1_v >= _v_cnt2_v: break v_cnt1 -= v_cnt1_v v_cnt2 += v_cnt1_v a1 = v_cnt1_v elif c == 4: if _v_cnt2_v >= _v_cnt0_v: break v_cnt0 += v_cnt2_v v_cnt2 -= v_cnt2_v a1 = v_cnt2_v elif c == 5: if _v_cnt2_v >= _v_cnt1_v: break v_cnt1 += v_cnt2_v v_cnt2 -= v_cnt2_v a1 = v_cnt2_v r = False a0 = v_cnt0 if _ == (buf_len - 1) and a0 == 0 and a1 == 1: r = True return [r, a0, a1] def x_crack_part1_raw(buf, offset, cond0, cond1, vct_max, strict=False): bits = 5 # buf[(1 << bits) - 1] == 0 i7_end = 6 if (offset != 0x18) else 1 vct = [] for i0 in range(6): for i1 in range(6): for i2 in range(6): for i3 in range(6): for i4 in range(6): for i5 in range(6): for i6 in range(6): for i7 in range(i7_end): buf[offset + 0] = i0 buf[offset + 1] = i1 buf[offset + 2] = i2 buf[offset + 3] = i3 buf[offset + 4] = i4 buf[offset + 5] = i5 buf[offset + 6] = i6 buf[offset + 7] = i7 r, a_0, a_1 = x_4010A0(buf, bits) if strict: ok = r else: ok = a_0 <= cond0 and (cond1 < 0 or a_1 <= cond1) if ok: v = [i0, i1, i2, i3, i4, i5, i6, i7] if strict: print('(%s): %s' % (len(vct), v)) vct.append(v) if (vct_max > 0) and (len(vct) >= vct_max): return vct return vct def x_crack_part1(count, use_cache=True): buf = [0] * 32 print('crack_part1 0:8') offset = 0 if use_cache: vct0 = [[0, 1, 3, 0, 4, 5, 0, 1], ] else: vct0 = x_crack_part1_raw(buf, offset, 0x10, -1, 1) print vct0 for _ in range(8): buf[offset + _] = vct0[0][_] print('crack_part1 8:0x10') offset += 8 if use_cache: vct1 = [[2, 1, 2, 4, 3, 0, 1, 3], ] else: vct1 = x_crack_part1_raw(buf, offset, 0x0F, -1, 1) print vct1 for _ in range(8): buf[offset + _] = vct1[0][_] print('crack_part1 0x10:0x18') offset += 8 if use_cache: vct2 = [[0, 2, 0, 2, 0, 2, 0, 4], ] else: vct2 = x_crack_part1_raw(buf, offset, 0, 1, 1) print vct2 for _ in range(8): buf[offset + _] = vct2[0][_] print('crack_part1 0x18:0x20') offset += 8 vct3 = x_crack_part1_raw(buf, offset, 0, 1, count, strict=True) r = [] for a in range(len(vct3)): v = [_ for _ in buf] for b in range(8): v[offset + b] = vct3[a][b] # print_array(v) r.append(v) return r def x_gen_sn(k): # char_map36 = 'abcdefghijklmnopqrstuvwxyz0123456789' char_map62 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz' char_map64 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. ' r0_0 = [] for _ in range(0, len(k), 2): r0_0 = [k[_ + 1] * 6 + k[_], ] + r0_0 v = array_to_int(r0_0, 36) # print_int(v, 36) # print int_to_str(v, char_map36) r0_0 = int_to_array(v, 256) r0_1 = [-1] * 4 r0 = r0_0 + r0_1 v1 = str_to_int('welcome to bbs.pediy.com.'[::-1], char_map64) v2 = str_to_int('Author by Lookhc'[::-1], char_map64) y = (v1 - v2 * 2) / 6 x = y + v2 r1 = int_to_array(x, 256) r2 = int_to_array(y, 256) k = [len(r0) - 4, len(r0), len(r1), len(r2)] + r0 + r1 + r2 r0_1 = crack_crc(k[0:len(r0)], k[4 + len(r0):], 0, 0) r0 = r0_0 + r0_1 k = [len(r0) - 4, len(r0), len(r1), len(r2)] + r0 + r1 + r2 print int_to_str(array_to_int(k, 256), char_map62) return def test(): # count = 256 count = 2 ks = x_crack_part1(count, use_cache=True) for _ in range(len(ks)): x_gen_sn(ks[_]) return test()
.text:00401EF2 cmp eax, 0Ah .text:00401EF5 jge loc_40210F .text:00401EFB test eax, eax .text:00401EFD jnz short loc_401F30 ... .text:004020FF call bn_compare .text:00402104 test eax, eax .text:00402106 jnz loc_4022E9 ; always jmp
[招生]科锐逆向工程师培训(2024年11月15日实地,远程教学同时开班, 第51期)
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