104 lines
4.7 KiB
C++
104 lines
4.7 KiB
C++
/*
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Windows XP CD Key Verification/Generator by z22
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Rewritten by Endermanch
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*/
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#include "header.h"
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HANDLE hConsole;
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ul32 dwSeed;
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byte charset[] = "BCDFGHJKMPQRTVWXY2346789";
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/*
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* PK: VX8CG-8KC6V-PVPMD-GKPPH-GC7W8
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*
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* The Windows XP product key is composed of 25 characters. The dashes store no information.
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* The product key is encoded in Base24 with an alphabet of "BCDFGHJKMPQRTVWXY2346789" in order
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* to avoid ambiguous characters (e.g. "I" and "1", "0" and "O").
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*
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* To convert a 25-digit key to binary data, we need to:
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* 1. Think of the key as of an array of bytes. Then convert the concatenated key VX8CG8KC6VPVPMDGKPPHGC7W8
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* into its Base24 representation ('B' = 0, 'C' = 1, 'D' = 2, ...) -> [ 13, 15, 22, 1, 4, ... ].
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* 2. Compute the decoded array in little-endiannessConvert.
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* 3. The decoded result is divided into sections:
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* - 12 bits -> OS Family
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* - 31 bits -> Hash
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* - 62 bits -> Signature
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* - 9 bits -> Prefix
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*
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* Product ID: AAAAA-BBB-CCCCCCC-DDEEE
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*
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* digits | length | encoding
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* --------+---------+---------------------------------------
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* AAAAA | 17 bits | bit 0 to bit 16 of P1
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* BBB | 10 bits | bit 17 to bit 26 of P1
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* CCCCCCC | 28 bits | bit 27 to bit 31 of P1 (lower 5 bits)
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* | | bit 0 to bit 22 of P2 (upper 23 bits)
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* DDEEE | 17 bits | bit 23 to bit 31 of P2 (lower 9 bits)
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* | | bit 0 to bit 7 of P3 (upper 8 bits)
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*
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* digits | meaning
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* --------+-------------------------------------------------
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* AAAAA | apparently always 55034 (in Windows XP RC1)
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* BBB | most significant three digits of Raw Product Key
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* | (see below)
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* CCCCCCC | least significant six digits of Raw Product Key
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* | plus check digit (see below)
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* DD | index of the public key used to verify the
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* | Product Key. Example: 22 for Professional keys; 23 for VLK keys
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* EEE | random value (used for phone activation, different installation IDs are generated)
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*/
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/*
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* Decoding the Product Key results in an example byte sequence.
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*
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* 0x6F 0xFA 0x95 0x45 0xFC 0x75 0xB5 0x52 0xBB 0xEF 0xB1 0x17 0xDA 0xCD 0x00
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*
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* Of these 15 bytes the least significant four bytes contain the Raw
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* Product Key in little endian byte order. The least significant bit is
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* removed by shifting this 32-bit value (0x4595FA6F - remember the
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* little endiannessConvert byte order) to the left by one bit position, resulting
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* in a Raw Product Key of 0x22CAFD37, or
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*
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* 583728439
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*
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* in decimal notation.
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*/
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int main() {
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ul32 nAmount = 1;
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hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
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srand(GetTickCount64());
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HINSTANCE hInstance = GetModuleHandleW(nullptr);
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int p = InitializeWindow(hInstance);
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system("cls");
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cprintf("Windows XP VLK Keygen\n\n", 0x08);
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cprintf("Principle of Operation:\n", 0x0C);
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printf("We need a valid Raw Product Key to generate a Product ID in form of AAAAA-BBB-CCCCCCS-DDEEE.\n\n");
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printf("AAAAA is the Windows XP Series constant - different for each version.\n");
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printf("Raw Product Key directly represents the BBB-CCCCCC part of the Product ID.\n");
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printf("S is a \"check bit\": it's picked so that the sum of all C digits with it added makes a number divisible by 7.\n");
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printf("DD is the index of the public key used to verify the Product Key.\n");
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printf("EEE is a random number used to generate a different Installation ID each time.\n\n");
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printf("The Product Key itself can at most contain 114 bits of information, as per the alphabet capacity formula.\n");
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printf("Based on that, we unpack the 114-bit Raw Product Key into 3 ordered segments:\n");
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printf("\tData (31 bits), Hash (28 bits) and Signature (55 bits).\n\n");
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printf("Microsoft uses a really elegant Elliptic Curve Algorithm to validate the product keys.\n");
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printf("It is a public-key cryptographic system, thus Microsoft had to share the public key,\nand it's, in fact, stored within pidgen.dll.\n");
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printf("To crack the CD-key generation algorithm we must find the corresponding private key from the public key,\nwhich was conveniently computed before us.\n");
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printf("In general, there are 2 special cases for the Elliptic Curve leveraged in cryptography - F2m and Fp.\nMicrosoft used the latter.\n");
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printf("\ty^2 = x^3 + ax + b %% p.\n");
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printf("The task boils down to generating a valid Hash/Signature pair for the Raw Key we provided:\n");
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printf("\t1. We need to generate a random 384-bit number r, and define C = R(r.x, r.y) = rG.\n");
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printf("\t2. Hash = (First32Bits(SHA1(pRaw, r.x, r.y)) >> 4.\n");
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printf("\t3. Signature = privateKey * Hash + (C %% Order)\n");
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printf("Finally, we pack these components together, convert them to Base24 and get a valid Windows XP key.\n");
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}
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