{"id":75,"date":"2022-11-09T01:27:07","date_gmt":"2022-11-08T17:27:07","guid":{"rendered":"https:\/\/www.shangwendada.co\/?p=75"},"modified":"2022-11-21T08:03:29","modified_gmt":"2022-11-21T00:03:29","slug":"reversecryptrc4","status":"publish","type":"post","link":"https:\/\/blog.shangwendada.top\/index.php\/2022\/11\/09\/reversecryptrc4\/","title":{"rendered":"[Reverse]crypt(rc4)"},"content":{"rendered":"
\n

\u9898\u76ee\u4e0b\u8f7d\u94fe\u63a5:crypt<\/a><\/h2>\n

\u52a8\u6001\u8c03\u8bd5<\/h2>\n

\u9996\u5148\u6211\u4eec\u5728\u8fd9\u4e24\u5904\u4e0b\u65ad\u70b9
\n

\"\"<\/div>
\n
\"\"<\/div>
\n\u6309f9\u8fdb\u5165\u52a8\u6001\u8c03\u8bd5\uff0c\u6211\u4eec\u9700\u8981\u8f93\u516522\u4f4d\u6570\u636e\uff08flag\u957f\u5ea6\u4e3a22\u4f4d\uff09
\n
\"\"<\/div>
\n\u8fdb\u5165\u8fd9\u4e2a\u7a97\u53e3\u540e\u6211\u4eec\u9009\u4e2d22\u884c\u6309tab\u8fdb\u5165\u6c47\u7f16\u754c\u9762
\n
\"\"<\/div>
\n\u53ef\u4ee5\u53d1\u73b00x14000131B\u5904\u51fa\u73b0\u4e86\u5f02\u6216\uff0c\u4e5f\u5c31\u662f\u6267\u884c22\u884c\u4ee3\u7801\u7684\u4f4d\u7f6e\uff0c\u6211\u4eec\u53ea\u9700\u8981\u628a\u6240\u6709\u5f02\u6216\u7684v9\u50a8\u5b58\u4e0b\u6765\u7136\u540e\u4e0e0x22\u548c\u5bc6\u6587\u5f02\u6216\u5c31\u884c\u4e86\u3002\u6211\u4eec\u7ee7\u7eed\u6309f8\u5f53rip\u8fd0\u884c\u5230
\n
\"file\"<\/div>
\n\u8be5\u5904\u65f6\u6211\u4eec\u5c06\u9f20\u6807\u653e\u5230rdx\u4e0a\u53ef\u4ee5\u770b\u5230\u91cc\u9762\u7684\u6570\u503c\u4e5f\u5c31\u662f\u6b64\u523bv9\u7684\u6570\u503c
\n
\"file\"<\/div>
\n\u53cd\u590d\u64cd\u4f5c22\u6b21\u6211\u4eec\u53ef\u4ee5\u5f97\u5230\u5982\u4e0b\u6570\u636e<\/p>\n
0xda,0xa9,0x73,0x1A,0xFE,0x4D,0xED,0x12,0x1E,0x66,0x5C,0x6D,0x8C,0x3C,0x96,0x49,0xFD,0x74,0xDF,0x43,0xDA,0x74<\/code><\/pre>\n
exp<\/h3>\n
#include<iostream>\n#include<string>\nusing namespace std;\n\nint data[]={0x9E,0xE7,0x30,0x5F,0xA7,0x01,0xA6,0x53,0x59,0x1B,0x0A,0x20,0xF1,0x73,0xD1,0x0E,0xAB,0x09,0x84,0x0E,0x8D, 0x2B};\nint tmp[]={0xda,0xa9,0x73,0x1A,0xFE,0x4D,0xED,0x12,0x1E,0x66,0x5C,0x6D,0x8C,0x3C,0x96,0x49,0xFD,0x74,0xDF,0x43,0xDA,0x74};\nstring flag;\nint main ()\n{\n    for(int i = 0 ; i < 22 ; i++ )\n    {\n        flag+=(char)(data[i]^tmp[i]^0x22);\n    }\n    cout<<flag;\n}\n<\/code><\/pre>\n
\u4f20\u7edfrc4<\/h2>\n
exp<\/h3>\n
#include<stdio.h>\n#include<windows.h>\n#include<cstring>\nusing namespace std;\n\nchar key[] =\n{\n  0x9E, 0xE7, 0x30, 0x5F, 0xA7, 0x01, 0xA6, 0x53, 0x59, 0x1B, \n  0x0A, 0x20, 0xF1, 0x73, 0xD1, 0x0E, 0xAB, 0x09, 0x84, 0x0E, \n  0x8D, 0x2B, 0x00, 0x00\n};\nchar Str[]="12345678abcdefghijklmnopqrspxyz";\n__int64 __fastcall sub_140001120(DWORD *a1, char *a2, int a3)\n{\n  __int64 result; \/\/ rax\n  int i; \/\/ [rsp+0h] [rbp-28h]\n  int j; \/\/ [rsp+0h] [rbp-28h]\n  int v6; \/\/ [rsp+4h] [rbp-24h]\n  int v7; \/\/ [rsp+8h] [rbp-20h]\n  int v8; \/\/ [rsp+Ch] [rbp-1Ch]\n  DWORD *v9; \/\/ [rsp+10h] [rbp-18h]\n\n  *a1 = 0;\n  a1[1] = 0;\n  v9 = a1 + 2;\n  for ( i = 0; i < 256; ++i )\n    v9[i] = i;\n  v6 = 0;\n  result = 0;\n  v7 = 0;\n  for ( j = 0; j < 256; ++j )\n  {\n    v8 = v9[j];\n    v7 = (unsigned __int8)(*(BYTE *)(a2 + v6) + v8 + v7);\n    v9[j] = v9[v7];\n    v9[v7] = v8;\n    if ( ++v6 >= a3 )\n      v6 = 0;\n    result = (unsigned int)(j + 1);\n  }\n  return result;\n}\nDWORD sub_140001240(DWORD *a1, char* a2, int a3)\n{\n  DWORD *result; \/\/ rax\n  int i; \/\/ [rsp+0h] [rbp-28h]\n  int v5; \/\/ [rsp+4h] [rbp-24h]\n  int v6; \/\/ [rsp+8h] [rbp-20h]\n  int v7; \/\/ [rsp+Ch] [rbp-1Ch]\n  int v8; \/\/ [rsp+10h] [rbp-18h]\n  DWORD *v9; \/\/ [rsp+18h] [rbp-10h]\n\n  v5 = *a1;\n  v6 = a1[1];\n  v9 = a1 + 2;\n  for ( i = 0; i < a3; ++i )\n  {\n    v5 = (unsigned __int8)(v5 + 1);\n    v7 = v9[v5];\n    v6 = (unsigned __int8)(v7 + v6);\n    v8 = v9[v6];\n    v9[v5] = v8;\n    v9[v6] = v7;\n    *(BYTE *)(a2 + i) ^= LOBYTE(v9[(unsigned __int8)(v8 + v7)]);\n  }\n  *a1 = v5;\n  result = a1;\n  a1[1] = v6;\n}\nint i;\nint main()\n{\n    DWORD *v9;\n    v9=(DWORD *)malloc(0x408*sizeof(v9));\n    sub_140001120(v9,Str,strlen(Str));\n    for(int i = 0 ; i < strlen(key);i ++  )\n    {\n        key[i]^=34;\n    }\n    sub_140001240(v9,key,strlen(key));\n    printf("%s",key);\n}\n<\/code><\/pre>\n
flag<\/h2>\n
flag{nice_to_meet_you}<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"
\u9898\u76ee\u4e0b\u8f7d\u94fe\u63a5:crypt \u52a8\u6001\u8c03\u8bd5 \u9996\u5148\u6211\u4eec\u5728\u8fd9\u4e24\u5904\u4e0b\u65ad\u70b9 \u6309f9\u8fdb\u5165\u52a8\u6001\u8c03\u8bd5\uff0c\u6211\u4eec\u9700\u8981\u8f93\u516522\u4f4d\u6570\u636e\uff08fla […]<\/p>\n","protected":false},"author":1,"featured_media":157,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-75","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/75","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/comments?post=75"}],"version-history":[{"count":7,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/75\/revisions"}],"predecessor-version":[{"id":85,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/posts\/75\/revisions\/85"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/media\/157"}],"wp:attachment":[{"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/media?parent=75"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/categories?post=75"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.shangwendada.top\/index.php\/wp-json\/wp\/v2\/tags?post=75"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}