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<?php /** SENDING **/ $td = mcrypt_module_open('twofish', '', 'cbc', ''); $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td)); $key = substr(md5('mylittlepony').sha1('flutershyismylove'), 0, 31); mcrypt_generic_init($td, $key, $iv); $encrypted = mcrypt_generic($td, 'This is very important data'); $message = base64_encode($encrypted).'||'.base64_encode($iv); echo $message, "\n"; /** RECEIVING **/ $a = explode('||', $message); var_dump($a); $message = base64_decode($a[0]); $td = mcrypt_module_open('twofish', '', 'cbc', ''); $iv = base64_decode($a[1]); $key = substr(md5('mylittlepony').sha1('flutershyismylove'), 0, 31); mcrypt_generic_init($td, $key, $iv); $decrypted = mdecrypt_generic($td, $message); mcrypt_generic_deinit($td); mcrypt_module_close($td); $decrypted = trim($decrypted); echo $decrypted, "\n";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kihc4
function name:  (null)
number of ops:  109
compiled vars:  !0 = $td, !1 = $iv, !2 = $key, !3 = $encrypted, !4 = $message, !5 = $a, !6 = $decrypted
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   INIT_FCALL_BY_NAME                                       'mcrypt_module_open'
          1        SEND_VAL_EX                                              'twofish'
          2        SEND_VAL_EX                                              ''
          3        SEND_VAL_EX                                              'cbc'
          4        SEND_VAL_EX                                              ''
          5        DO_FCALL                                      0  $7      
          6        ASSIGN                                                   !0, $7
    7     7        INIT_FCALL_BY_NAME                                       'mcrypt_create_iv'
          8        INIT_FCALL_BY_NAME                                       'mcrypt_enc_get_iv_size'
          9        SEND_VAR_EX                                              !0
         10        DO_FCALL                                      0  $9      
         11        SEND_VAR_NO_REF_EX                                       $9
         12        DO_FCALL                                      0  $10     
         13        ASSIGN                                                   !1, $10
    8    14        INIT_FCALL                                               'substr'
         15        INIT_FCALL                                               'md5'
         16        SEND_VAL                                                 'mylittlepony'
         17        DO_ICALL                                         $12     
         18        INIT_FCALL                                               'sha1'
         19        SEND_VAL                                                 'flutershyismylove'
         20        DO_ICALL                                         $13     
         21        CONCAT                                           ~14     $12, $13
         22        SEND_VAL                                                 ~14
         23        SEND_VAL                                                 0
         24        SEND_VAL                                                 31
         25        DO_ICALL                                         $15     
         26        ASSIGN                                                   !2, $15
    9    27        INIT_FCALL_BY_NAME                                       'mcrypt_generic_init'
         28        SEND_VAR_EX                                              !0
         29        SEND_VAR_EX                                              !2
         30        SEND_VAR_EX                                              !1
         31        DO_FCALL                                      0          
   10    32        INIT_FCALL_BY_NAME                                       'mcrypt_generic'
         33        SEND_VAR_EX                                              !0
         34        SEND_VAL_EX                                              'This+is+very+important+data'
         35        DO_FCALL                                      0  $18     
         36        ASSIGN                                                   !3, $18
   11    37        INIT_FCALL                                               'base64_encode'
         38        SEND_VAR                                                 !3
         39        DO_ICALL                                         $20     
         40        CONCAT                                           ~21     $20, '%7C%7C'
         41        INIT_FCALL                                               'base64_encode'
         42        SEND_VAR                                                 !1
         43        DO_ICALL                                         $22     
         44        CONCAT                                           ~23     ~21, $22
         45        ASSIGN                                                   !4, ~23
   13    46        ECHO                                                     !4
         47        ECHO                                                     '%0A'
   17    48        INIT_FCALL                                               'explode'
         49        SEND_VAL                                                 '%7C%7C'
         50        SEND_VAR                                                 !4
         51        DO_ICALL                                         $25     
         52        ASSIGN                                                   !5, $25
   18    53        INIT_FCALL                                               'var_dump'
         54        SEND_VAR                                                 !5
         55        DO_ICALL                                                 
   20    56        INIT_FCALL                                               'base64_decode'
         57        FETCH_DIM_R                                      ~28     !5, 0
         58        SEND_VAL                                                 ~28
         59        DO_ICALL                                         $29     
         60        ASSIGN                                                   !4, $29
   21    61        INIT_FCALL_BY_NAME                                       'mcrypt_module_open'
         62        SEND_VAL_EX                                              'twofish'
         63        SEND_VAL_EX                                              ''
         64        SEND_VAL_EX                                              'cbc'
         65        SEND_VAL_EX                                              ''
         66        DO_FCALL                                      0  $31     
         67        ASSIGN                                                   !0, $31
   22    68        INIT_FCALL                                               'base64_decode'
         69        FETCH_DIM_R                                      ~33     !5, 1
         70        SEND_VAL                                                 ~33
         71        DO_ICALL                                         $34     
         72        ASSIGN                                                   !1, $34
   23    73        INIT_FCALL                                               'substr'
         74        INIT_FCALL                                               'md5'
         75        SEND_VAL                                                 'mylittlepony'
         76        DO_ICALL                                         $36     
         77        INIT_FCALL                                               'sha1'
         78        SEND_VAL                                                 'flutershyismylove'
         79        DO_ICALL                                         $37     
         80        CONCAT                                           ~38     $36, $37
         81        SEND_VAL                                                 ~38
         82        SEND_VAL                                                 0
         83        SEND_VAL                                                 31
         84        DO_ICALL                                         $39     
         85        ASSIGN                                                   !2, $39
   24    86        INIT_FCALL_BY_NAME                                       'mcrypt_generic_init'
         87        SEND_VAR_EX                                              !0
         88        SEND_VAR_EX                                              !2
         89        SEND_VAR_EX                                              !1
         90        DO_FCALL                                      0          
   25    91        INIT_FCALL_BY_NAME                                       'mdecrypt_generic'
         92        SEND_VAR_EX                                              !0
         93        SEND_VAR_EX                                              !4
         94        DO_FCALL                                      0  $42     
         95        ASSIGN                                                   !6, $42
   26    96        INIT_FCALL_BY_NAME                                       'mcrypt_generic_deinit'
         97        SEND_VAR_EX                                              !0
         98        DO_FCALL                                      0          
   27    99        INIT_FCALL_BY_NAME                                       'mcrypt_module_close'
        100        SEND_VAR_EX                                              !0
        101        DO_FCALL                                      0          
   28   102        INIT_FCALL                                               'trim'
        103        SEND_VAR                                                 !6
        104        DO_ICALL                                         $46     
        105        ASSIGN                                                   !6, $46
   30   106        ECHO                                                     !6
        107        ECHO                                                     '%0A'
        108      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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