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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：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 | 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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