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[原创]武林外传登陆数据包加密算法分析
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发表于: 2009-11-25 18:37
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当用户点击登录游戏后，服务器会发送一段数据到本地：
其中选中部分就是服务器发送到本地的随机密钥（不知道称为密钥合不合适，因为它会当做数据被加密）。。。。其余是一些数据包特征和偏移大小之类的。。。
然后利用此密钥经过一系列的处理之后。。。。发送给服务器如下验证信息：
其中选中的部分的数据就是加密之后的数据。。。。。
下面来分析这个过程。。。当然下面的分析不是非常详细。。。不然就不和谐了。。。。
首先来看一下主加密函数，此函数写得甚是壮观。。。上千条汇编语句尽然没有一条跳转指令，IDA F5了下修改了几处，倒是能编译运行了。。。代码如下：
int code(BYTE *key, const void *a2)
{
DWORD result; // eax@1
BYTE *v3; // ebx@1
DWORD key1; // ebp@1
DWORD key3; // eax@1
DWORD key2; // edx@1
unsigned int v7; // eax@1
unsigned int v8; // ecx@1
unsigned int v9; // edx@1
unsigned int v10; // esi@1
unsigned int v11; // eax@1
unsigned int v12; // ecx@1
unsigned int v13; // edx@1
unsigned int v14; // esi@1
unsigned int v15; // eax@1
unsigned int v16; // ecx@1
unsigned int v17; // edx@1
unsigned int v18; // esi@1
unsigned int v19; // eax@1
unsigned int v20; // ecx@1
unsigned int v21; // edx@1
unsigned int v22; // esi@1
unsigned int v23; // eax@1
unsigned int v24; // ecx@1
unsigned int v25; // edx@1
unsigned int v26; // esi@1
unsigned int v27; // eax@1
unsigned int v28; // ecx@1
unsigned int v29; // edx@1
unsigned int v30; // esi@1
unsigned int v31; // eax@1
unsigned int v32; // ecx@1
unsigned int v33; // edx@1
unsigned int v34; // esi@1
unsigned int v35; // eax@1
unsigned int v36; // ecx@1
unsigned int v37; // edx@1
unsigned int v38; // esi@1
unsigned int v39; // eax@1
unsigned int v40; // edi@1
unsigned int v41; // ebp@1
unsigned int v42; // ecx@1
unsigned int v43; // eax@1
unsigned int v44; // edx@1
unsigned int v45; // esi@1
unsigned int v46; // ecx@1
unsigned int v47; // eax@1
unsigned int v48; // edx@1
unsigned int v49; // esi@1
unsigned int v50; // ecx@1
unsigned int v51; // eax@1
unsigned int v52; // edx@1
unsigned int v53; // esi@1
unsigned int v54; // ecx@1
unsigned int v55; // eax@1
unsigned int v56; // edx@1
unsigned int v57; // esi@1
unsigned int v58; // ecx@1
unsigned int v59; // eax@1
unsigned int v60; // edx@1
unsigned int v61; // esi@1
unsigned int v62; // ecx@1
unsigned int v63; // eax@1
unsigned int v64; // edx@1
unsigned int v65; // esi@1
unsigned int v66; // ecx@1
unsigned int v67; // eax@1
unsigned int v68; // edi@1
unsigned int v69; // edx@1
DWORD v70; // esi@1
unsigned int v71; // eax@1
DWORD v72; // ecx@1
BYTE v73[64]; // [sp+14h] [bp-40h]@1
unsigned int v74; // [sp+10h] [bp-44h]@1
v3 = key;
key1 = *(DWORD *)(key + 12);
key3 = *(DWORD *)(key + 20);
key2 = *(DWORD *)(key + 16);
memcpy(v73, a2, sizeof(v73));
v7 = key1
+ (((*(DWORD *)(v3 + 8) + (key1 & key2 | key3 & ~key1) + *(DWORD*)v73 - 680876936) << 7) | ((*(DWORD *)(v3 + 8)
+ (key1 & key2 | key3 & (unsigned int)~key1)
+ (DWORD)v73
- 680876936) >> 25));
v8 = v7
+ (((*(DWORD *)(v3 + 20) + *(DWORD *)&v73[4] + (v7 & key1 | key2 & ~v7) - 389564586) << 12) | ((*(DWORD *)(v3 + 20) + *(DWORD *)&v73[4] + (v7 & key1 | key2 & ~v7) - 389564586) >> 20));
v9 = v8
+ (((key2 + *(DWORD *)&v73[8] + (v7 & v8 | key1 & ~v8) + 606105819) << 17) | ((key2
+ *(DWORD *)&v73[8]
+ (v7 & v8 | key1 & ~v8)
+ 606105819) >> 15));
v10 = v9
+ (((key1 - 1044525330 + *(DWORD *)&v73[12] + (v9 & v8 | v7 & ~v9)) >> 10) | ((key1
- 1044525330
+ *(DWORD *)&v73[12]
+ (v9 & v8 | v7 & ~v9)) << 22));
v11 = v10
+ (((v7 + *(DWORD *)&v73[16] + (v10 & v9 | v8 & ~v10) - 176418897) << 7) | ((v7
+ *(DWORD *)&v73[16]
+ (v10 & v9 | v8 & ~v10)
- 176418897) >> 25));
v12 = v11
+ (((v8 + *(DWORD *)&v73[20] + (v11 & v10 | v9 & ~v11) + 1200080426) << 12) | ((v8
+ *(DWORD *)&v73[20]
+ (v11 & v10 | v9 & ~v11)
+ 1200080426) >> 20));
v13 = v12
+ (((v9 + *(DWORD *)&v73[24] + (v11 & v12 | v10 & ~v12) - 1473231341) << 17) | ((v9
+ *(DWORD *)&v73[24]
+ (v11 & v12 | v10 & ~v12)
- 1473231341) >> 15));
v14 = v13
+ (((v10 + *(DWORD *)&v73[28] + (v13 & v12 | v11 & ~v13) - 45705983) >> 10) | ((v10
+ *(DWORD *)&v73[28]
+ (v13 & v12 | v11 & ~v13)
- 45705983) << 22));
v15 = v14
+ (((v11 + *(DWORD *)&v73[32] + (v14 & v13 | v12 & ~v14) + 1770035416) << 7) | ((v11
+ *(DWORD *)&v73[32]
+ (v14 & v13 | v12 & ~v14)
+ 1770035416) >> 25));
v16 = v15
+ (((v12 + *(DWORD *)&v73[36] + (v15 & v14 | v13 & ~v15) - 1958414417) << 12) | ((v12
+ *(DWORD *)&v73[36]
+ (v15 & v14 | v13 & ~v15)
- 1958414417) >> 20));
v17 = v16
+ (((v13 + *(DWORD *)&v73[40] + (v15 & v16 | v14 & ~v16) - 42063) << 17) | ((v13
+ *(DWORD *)&v73[40]
+ (v15 & v16 | v14 & ~v16)
- 42063) >> 15));
v18 = v17
+ (((v14 + *(DWORD *)&v73[44] + (v17 & v16 | v15 & ~v17) - 1990404162) >> 10) | ((v14
+ *(DWORD *)&v73[44]
+ (v17 & v16 | v15 & ~v17)
- 1990404162) << 22));
v19 = v18
+ (((v15 + *(DWORD *)&v73[48] + (v18 & v17 | v16 & ~v18) + 1804603682) << 7) | ((v15
+ *(DWORD *)&v73[48]
+ (v18 & v17 | v16 & ~v18)
+ 1804603682) >> 25));
v20 = v19
+ (((v16 + *(DWORD *)&v73[52] + (v19 & v18 | v17 & ~v19) - 40341101) << 12) | ((v16
+ *(DWORD *)&v73[52]
+ (v19 & v18 | v17 & ~v19)
- 40341101) >> 20));
a2 = (const void *)~v20;
v21 = v20
+ (((v17 + *(DWORD *)&v73[56] + (v19 & v20 | v18 & ~v20) - 1502002290) << 17) | ((v17
+ *(DWORD *)&v73[56]
+ (v19 & v20 | v18 & ~v20)
- 1502002290) >> 15));
v74 = ~v21;
v22 = v21
+ (((v18 + *(DWORD *)&v73[60] + (v21 & v20 | v19 & ~v21) + 1236535329) >> 10) | ((v18
+ *(DWORD *)&v73[60]
+ (v21 & v20 | v19 & ~v21)
+ 1236535329) << 22));
v23 = v22
+ (32 * (v19 + *(DWORD *)&v73[4] + (v22 & v20 | v21 & ~v20) - 165796510) | ((v19
+ *(DWORD *)&v73[4]
+ (v22 & v20 | v21 & ~v20)
- 165796510) >> 27));
v24 = v23
+ (((v20 + *(DWORD *)&v73[24] + (v23 & v21 | v22 & ~v21) - 1069501632) << 9) | ((v20
+ *(DWORD *)&v73[24]
+ (v23 & v21 | v22 & ~v21)
- 1069501632) >> 23));
v25 = v24
+ (((v21 + *(DWORD *)&v73[44] + (v22 & v24 | v23 & ~v22) + 643717713) << 14) | ((v21
+ *(DWORD *)&v73[44]
+ (v22 & v24 | v23 & ~v22)
+ 643717713) >> 18));
v26 = v25
+ (((v22 + (DWORD)v73 + (v23 & v25 | v24 & ~v23) - 373897302) >> 12) | ((v22
+ (DWORD)v73
+ (v23 & v25 | v24 & ~v23)
- 373897302) << 20));
v27 = v26
+ (32 * (v23 + *(DWORD *)&v73[20] + (v26 & v24 | v25 & ~v24) - 701558691) | ((v23
+ *(DWORD *)&v73[20]
+ (v26 & v24 | v25 & ~v24)
- 701558691) >> 27));
v28 = v27
+ (((v24 + *(DWORD *)&v73[40] + (v27 & v25 | v26 & ~v25) + 38016083) << 9) | ((v24
+ *(DWORD *)&v73[40]
+ (v27 & v25 | v26 & ~v25)
+ 38016083) >> 23));
v29 = v28
+ (((v25 + *(DWORD *)&v73[60] + (v26 & v28 | v27 & ~v26) - 660478335) << 14) | ((v25
+ *(DWORD *)&v73[60]
+ (v26 & v28 | v27 & ~v26)
- 660478335) >> 18));
v30 = v29
+ (((v26 + *(DWORD *)&v73[16] + (v27 & v29 | v28 & ~v27) - 405537848) >> 12) | ((v26
+ *(DWORD *)&v73[16]
+ (v27 & v29 | v28 & ~v27)
- 405537848) << 20));
v31 = v30
+ (32 * (v27 + *(DWORD *)&v73[36] + (v30 & v28 | v29 & ~v28) + 568446438) | ((v27
+ *(DWORD *)&v73[36]
+ (v30 & v28 | v29 & ~v28)
+ 568446438) >> 27));
v32 = v31
+ (((v28 + *(DWORD *)&v73[56] + (v31 & v29 | v30 & ~v29) - 1019803690) << 9) | ((v28
+ *(DWORD *)&v73[56]
+ (v31 & v29 | v30 & ~v29)
- 1019803690) >> 23));
v33 = v32
+ (((v29 + *(DWORD *)&v73[12] + (v30 & v32 | v31 & ~v30) - 187363961) << 14) | ((v29
+ *(DWORD *)&v73[12]
+ (v30 & v32 | v31 & ~v30)
- 187363961) >> 18));
v34 = v33
+ (((v30 + *(DWORD *)&v73[32] + (v31 & v33 | v32 & ~v31) + 1163531501) >> 12) | ((v30
+ *(DWORD *)&v73[32]
+ (v31 & v33 | v32 & ~v31)
+ 1163531501) << 20));
v35 = v34
+ (32 * (v31 + *(DWORD *)&v73[52] + (v34 & v32 | v33 & ~v32) - 1444681467) | ((v31
+ *(DWORD *)&v73[52]
+ (v34 & v32 | v33 & ~v32)
- 1444681467) >> 27));
v36 = v35
+ (((v32 + *(DWORD *)&v73[8] + (v35 & v33 | v34 & ~v33) - 51403784) << 9) | ((v32
+ *(DWORD *)&v73[8]
+ (v35 & v33 | v34 & ~v33)
- 51403784) >> 23));
v37 = v36
+ (((v33 + *(DWORD *)&v73[28] + (v34 & v36 | v35 & ~v34) + 1735328473) << 14) | ((v33
+ *(DWORD *)&v73[28]
+ (v34 & v36 | v35 & ~v34)
+ 1735328473) >> 18));
v38 = v37
+ (((v34 + *(DWORD *)&v73[48] + (v35 & v37 | v36 & ~v35) - 1926607734) >> 12) | ((v34
+ *(DWORD *)&v73[48]
+ (v35 & v37 | v36 & ~v35)
- 1926607734) << 20));
v39 = v38
+ (16 * (v35 + *(DWORD *)&v73[20] + (v38 ^ v37 ^ v36) - 378558) | ((v35
+ *(DWORD *)&v73[20]
+ (v38 ^ v37 ^ v36)
- 378558) >> 28));
v40 = v39
+ (((v36 + *(DWORD *)&v73[32] + (v39 ^ v38 ^ v37) - 2022574463) << 11) | ((v36
+ *(DWORD *)&v73[32]
+ (v39 ^ v38 ^ v37)
- 2022574463) >> 21));
v41 = v40
+ (((v37 + *(DWORD *)&v73[44] + (v39 ^ v38 ^ v40) + 1839030562) << 16) | ((v37
+ *(DWORD *)&v73[44]
+ (v39 ^ v38 ^ v40)
+ 1839030562) >> 16));
v42 = v41
+ (((v38 + *(DWORD *)&v73[56] + (v39 ^ v41 ^ v40) - 35309556) >> 9) | ((v38
+ *(DWORD *)&v73[56]
+ (v39 ^ v41 ^ v40)
- 35309556) << 23));
v43 = v42
+ (16 * (v39 + *(DWORD *)&v73[4] + (v42 ^ v41 ^ v40) - 1530992060) | ((v39
+ *(DWORD *)&v73[4]
+ (v42 ^ v41 ^ v40)
- 1530992060) >> 28));
v44 = v43
+ (((v40 + *(DWORD *)&v73[16] + (v43 ^ v42 ^ v41) + 1272893353) << 11) | ((v40
+ *(DWORD *)&v73[16]
+ (v43 ^ v42 ^ v41)
+ 1272893353) >> 21));
v45 = v44
+ (((v41 - 155497632 + *(DWORD *)&v73[28] + (v43 ^ v42 ^ v44)) << 16) | ((v41
- 155497632
+ *(DWORD *)&v73[28]
+ (v43 ^ v42 ^ v44)) >> 16));
v46 = v45
+ (((v42 + *(DWORD *)&v73[40] + (v43 ^ v45 ^ v44) - 1094730640) >> 9) | ((v42
+ *(DWORD *)&v73[40]
+ (v43 ^ v45 ^ v44)
- 1094730640) << 23));
v47 = v46
+ (16 * (v43 + *(DWORD *)&v73[52] + (v46 ^ v45 ^ v44) + 681279174) | ((v43
+ *(DWORD *)&v73[52]
+ (v46 ^ v45 ^ v44)
+ 681279174) >> 28));
v48 = v47
+ (((v44 + (DWORD)v73 + (v47 ^ v46 ^ v45) - 358537222) << 11) | ((v44
+ (DWORD)v73
+ (v47 ^ v46 ^ v45)
- 358537222) >> 21));
v49 = v48
+ (((v45 + *(DWORD *)&v73[12] + (v47 ^ v46 ^ v48) - 722521979) << 16) | ((v45
+ *(DWORD *)&v73[12]
+ (v47 ^ v46 ^ v48)
- 722521979) >> 16));
v50 = v49
+ (((v46 + *(DWORD *)&v73[24] + (v47 ^ v49 ^ v48) + 76029189) >> 9) | ((v46
+ *(DWORD *)&v73[24]
+ (v47 ^ v49 ^ v48)
+ 76029189) << 23));
v51 = v50
+ (16 * (v47 + *(DWORD *)&v73[36] + (v50 ^ v49 ^ v48) - 640364487) | ((v47
+ *(DWORD *)&v73[36]
+ (v50 ^ v49 ^ v48)
- 640364487) >> 28));
v52 = v51
+ (((v48 + *(DWORD *)&v73[48] + (v51 ^ v50 ^ v49) - 421815835) << 11) | ((v48
+ *(DWORD *)&v73[48]
+ (v51 ^ v50 ^ v49)
- 421815835) >> 21));
v53 = v52
+ (((v49 + *(DWORD *)&v73[60] + (v51 ^ v50 ^ v52) + 530742520) << 16) | ((v49
+ *(DWORD *)&v73[60]
+ (v51 ^ v50 ^ v52)
+ 530742520) >> 16));
v54 = v53
+ (((v50 + *(DWORD *)&v73[8] + (v51 ^ v53 ^ v52) - 995338651) >> 9) | ((v50
+ *(DWORD *)&v73[8]
+ (v51 ^ v53 ^ v52)
- 995338651) << 23));
v55 = v54
+ (((v51 + (DWORD)v73 + (v53 ^ (v54 | ~v52)) - 198630844) << 6) | ((v51
+ (DWORD)v73
+ (v53 ^ (v54 | ~v52))
- 198630844) >> 26));
v56 = v55
+ (((v52 + *(DWORD *)&v73[28] + (v54 ^ (v55 | ~v53)) + 1126891415) << 10) | ((v52
+ *(DWORD *)&v73[28]
+ (v54 ^ (v55 | ~v53))
+ 1126891415) >> 22));
v57 = v56
+ (((v53 + *(DWORD *)&v73[56] + (v55 ^ (v56 | ~v54)) - 1416354905) << 15) | ((v53
+ *(DWORD *)&v73[56]
+ (v55 ^ (v56 | ~v54))
- 1416354905) >> 17));
v58 = v57
+ (((v54 + *(DWORD *)&v73[20] + (v56 ^ (v57 | ~v55)) - 57434055) >> 11) | ((v54
+ *(DWORD *)&v73[20]
+ (v56 ^ (v57 | ~v55))
- 57434055) << 21));
v59 = v58
+ (((v55 + *(DWORD *)&v73[48] + (v57 ^ (v58 | ~v56)) + 1700485571) << 6) | ((v55
+ *(DWORD *)&v73[48]
+ (v57 ^ (v58 | ~v56))
+ 1700485571) >> 26));
v60 = v59
+ (((v56 + *(DWORD *)&v73[12] + (v58 ^ (v59 | ~v57)) - 1894986606) << 10) | ((v56
+ *(DWORD *)&v73[12]
+ (v58 ^ (v59 | ~v57))
- 1894986606) >> 22));
v61 = v60
+ (((v57 + *(DWORD *)&v73[40] + (v59 ^ (v60 | ~v58)) - 1051523) << 15) | ((v57
+ *(DWORD *)&v73[40]
+ (v59 ^ (v60 | ~v58))
- 1051523) >> 17));
v62 = v61
+ (((v58 + *(DWORD *)&v73[4] + (v60 ^ (v61 | ~v59)) - 2054922799) >> 11) | ((v58
+ *(DWORD *)&v73[4]
+ (v60 ^ (v61 | ~v59))
- 2054922799) << 21));
v63 = v62
+ (((v59 + *(DWORD *)&v73[32] + (v61 ^ (v62 | ~v60)) + 1873313359) << 6) | ((v59
+ *(DWORD *)&v73[32]
+ (v61 ^ (v62 | ~v60))
+ 1873313359) >> 26));
v64 = v63
+ (((v60 + *(DWORD *)&v73[60] + (v62 ^ (v63 | ~v61)) - 30611744) << 10) | ((v60
+ *(DWORD *)&v73[60]
+ (v62 ^ (v63 | ~v61))
- 30611744) >> 22));
v65 = v64
+ (((v61 + *(DWORD *)&v73[24] + (v63 ^ (v64 | ~v62)) - 1560198380) << 15) | ((v61
+ *(DWORD *)&v73[24]
+ (v63 ^ (v64 | ~v62))
- 1560198380) >> 17));
v66 = v65
+ (((v62 + *(DWORD *)&v73[52] + (v64 ^ (v65 | ~v63)) + 1309151649) >> 11) | ((v62
+ *(DWORD *)&v73[52]
+ (v64 ^ (v65 | ~v63))
+ 1309151649) << 21));
v67 = v66
+ (((v63 + *(DWORD *)&v73[16] + (v65 ^ (v66 | ~v64)) - 145523070) << 6) | ((v63
+ *(DWORD *)&v73[16]
+ (v65 ^ (v66 | ~v64))
- 145523070) >> 26));
v68 = v67
+ (((v64 + *(DWORD *)&v73[44] + (v66 ^ (v67 | ~v65)) - 1120210379) << 10) | ((v64
+ *(DWORD *)&v73[44]
+ (v66 ^ (v67 | ~v65))
- 1120210379) >> 22));
v69 = v68
+ (((v65 + *(DWORD *)&v73[8] + (v67 ^ (v68 | ~v66)) + 718787259) << 15) | ((v65
+ *(DWORD *)&v73[8]
+ (v67 ^ (v68 | ~v66))
+ 718787259) >> 17));
v70 = v67 + *(DWORD *)(v3 + 8);
v71 = ((v66 + *(DWORD *)&v73[36] + (v68 ^ (v69 | ~v67)) - 343485551) >> 11) | ((v66
+ *(DWORD *)&v73[36]
+ (v68 ^ (v69 | ~v67))
- 343485551) << 21);
v72 = *(DWORD *)(v3 + 12);
*(DWORD *)(v3 + 8) = v70;
*(DWORD *)(v3 + 12) = v72 + v69 + v71;
*(DWORD *)(v3 + 16) += v69;
result = v68 + *(DWORD *)(v3 + 20);
*(DWORD *)(v3 + 20) = result;
return result;
}
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