diff --git a/CMakeLists.txt b/CMakeLists.txt
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--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 3.24)
+project(Keygen)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(
+        Keygen
+        main.cpp
+)
+target_link_libraries(Keygen ${CMAKE_CURRENT_SOURCE_DIR}/lib/libcrypto.lib -static)
\ No newline at end of file
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diff --git a/lib/ossl-modules/legacy.dll b/lib/ossl-modules/legacy.dll
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diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..de22aff
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,601 @@
+/*
+	Windows XP CD Key Verification/Generator v0.03
+	by z22
+	
+	Compile with OpenSSL libs, modify to suit your needs.
+	http://gnuwin32.sourceforge.net/packages/openssl.htm
+
+	History:
+	0.03	Stack corruptionerror on exit fixed (now pkey is large enough)
+			More Comments added
+	0.02	Changed name the *.cpp;
+			Fixed minor bugs & Make it compilable on VC++
+	0.01	First version compilable MingW
+
+
+*/
+
+#include <cstdio>
+#include <cstring>
+#include <cassert>
+#include <openssl/bn.h>
+#include <openssl/ec.h>
+#include <openssl/sha.h>
+#include <windows.h>
+
+#define FIELD_BITS 384
+#define FIELD_BYTES 48
+
+typedef unsigned char U8;
+typedef unsigned long U32;
+
+HANDLE hConsole;
+unsigned char charset[] = "BCDFGHJKMPQRTVWXY2346789";
+
+/* Colored output */
+VOID cprintf(CONST CHAR *Format, INT nColor, ...) {
+    va_list vList;
+
+    va_start(vList, nColor);
+
+    SetConsoleTextAttribute(hConsole, nColor);
+    vprintf(Format, vList);
+    SetConsoleTextAttribute(hConsole, 0x0F);
+
+    va_end(vList);
+
+    return;
+}
+
+/* Unpacks the Product Key. */
+void extract(unsigned long *serial, unsigned long *hash, unsigned long *sig, unsigned long *raw) {
+
+    // We're assuming that the quantity of information within the product key is at most 114 bits.
+    // log2(24^25) = 114.
+
+    // Serial = Bits [0..30] -> 31 bits
+	serial[0] = raw[0] & 0x7fffffff;
+ 
+    // Hash (e) = Bits [31..58] -> 28 bits
+	hash[0] = ((raw[0] >> 31) | (raw[1] << 1)) & 0xfffffff;
+ 
+    // Signature (s) = Bits [59..113] -> 55 bits
+	sig[0] = (raw[1] >> 27) | (raw[2] << 5);
+	sig[1] = (raw[2] >> 27) | (raw[3] << 5);
+}
+
+/* Repacks the Product Key. */
+void pack(unsigned long *raw, unsigned long *serial, unsigned long *hash, unsigned long *sig) {
+	raw[0] = serial[0] | ((hash[0] & 1) << 31);
+	raw[1] = (hash[0] >> 1) | ((sig[0] & 0x1f) << 27);
+	raw[2] = (sig[0] >> 5) | (sig[1] << 27);
+	raw[3] = sig[1] >> 5;
+}
+
+/* Convert data between endianness types. */
+void endiannessConvert(unsigned char *data, int length) {
+	for (int i = 0; i < length / 2; i++) {
+        unsigned char temp = data[i];
+		data[i] = data[length - i - 1];
+		data[length - i - 1] = temp;
+	}
+}
+
+/* Convert from byte sequence to the CD-key. */
+void base24(unsigned char *cdKey, unsigned long *byteSeq) {
+    unsigned char rbs[16];
+    BIGNUM *z;
+
+    // Copy byte sequence to the reversed byte sequence.
+    memcpy(rbs, byteSeq, sizeof(rbs));
+
+    // Skip trailing zeroes and reverse y.
+    int length;
+
+    for (length = 15; rbs[length] == 0; length--);
+    endiannessConvert(rbs, ++length);
+
+    // Convert reversed byte sequence to BigNum z.
+    z = BN_bin2bn(rbs, length, nullptr);
+
+    // Divide z by 24 and convert the remainder to a CD-key char.
+    cdKey[25] = 0;
+
+    for (int i = 24; i >= 0; i--)
+        cdKey[i] = charset[BN_div_word(z, 24)];
+
+    BN_free(z);
+}
+
+/* Convert from CD-key to a byte sequence. */
+void unbase24(unsigned long *byteSeq, unsigned char *cdKey) {
+	BIGNUM *y = BN_new();
+	BN_zero(y);
+
+    // Empty byte sequence.
+    memset(byteSeq, 0, 16);
+
+    // For each character in product key, place its ASCII-code.
+	for (int i = 0; i < 25; i++) {
+		BN_mul_word(y, 24);
+		BN_add_word(y, cdKey[i]);
+	}
+
+    // Acquire length.
+	int n = BN_num_bytes(y);
+
+    // Place the generated code into the byte sequence.
+	BN_bn2bin(y, (unsigned char *)byteSeq);
+	BN_free(y);
+
+    // Reverse the byte sequence.
+    endiannessConvert((unsigned char *) byteSeq, n);
+}
+
+/* Print Product ID using a Product Key. */
+void printProductID(unsigned long *pKey) {
+	char raw[12];
+	char b[6], c[8];
+	
+    // Cut away last bit of the product key and convert it to an ASCII-number (=raw)
+	sprintf(raw, "%lu", pKey[0] >> 1);
+ 
+    // Make B-part {...-640-...} -> most significant 3 digits of Raw Product Key
+	strncpy(b, raw, 3);
+	b[3] = 0;
+
+    // Make C-part {...-123456X-...} -> least significant 6 digits of Raw Product Key
+	strcpy(c, raw + 3);
+
+    // Make checksum digit-part {...56X-}
+	assert(strlen(c) == 6);
+
+    int digit = 0;
+
+    // Reverse sum algorithm to find a check digit that would add to the rest to form a sum divisible by 7.
+	for (int i = 0; i < 6; i++)
+		digit -= c[i] - '0';
+
+	while (digit < 0)
+		digit += 7;
+
+    // Append check digit + null terminate.
+	c[6] = digit + '0';
+	c[7] = 0;
+
+    printf("Product ID: ");
+	cprintf("PPPPP-%s-%s-23XXX\n", 0x0E, b, c);
+}
+
+/* Print Product Key. */
+void printProductKey(unsigned char *pKey) {
+	assert(strlen((const char *)pKey) == 25);
+
+    SetConsoleTextAttribute(hConsole, 0x0A);
+
+	for (int i = 0; i < 25; i++) {
+		putchar(pKey[i]);
+		if (i != 24 && i % 5 == 4) putchar('-');
+	}
+
+    SetConsoleTextAttribute(hConsole, 0x0F);
+}
+
+/* Verify Product Key */
+void verifyKey(EC_GROUP *ec, EC_POINT *generator, EC_POINT *publicKey, char *cdKey) {
+	unsigned char key[25];
+
+	BN_CTX *ctx = BN_CTX_new();
+
+    // Remove dashes from the CD-key.
+	for (int i = 0, k = 0; i < strlen(cdKey) && k < 25; i++) {
+		for (int j = 0; j < 24; j++) {
+			if (cdKey[i] != '-' && cdKey[i] == charset[j]) {
+				key[k++] = j;
+				break;
+			}
+
+            // Make sure the CD-key passes the verification procedure.
+			assert(j < 24);
+		}
+	}
+	
+    // Convert Base24 CD-key to bytecode.
+	unsigned long bKey[4]{};
+	unsigned long pID[1], hash[1], sig[2];
+
+	unbase24(bKey, key);
+ 
+    // Output CD-key bytecode.
+	printf("Bytecode: %.8lX %.8lX %.8lX %.8lX\n", bKey[3], bKey[2], bKey[1], bKey[0]);
+
+    // Extract pid_data, hash and signature from the bytecode.
+    extract(pID, hash, sig, bKey);
+    printProductID(pID);
+	
+	printf("PID: %.8lX\nHash: %.8lX\nSignature: %.8lX %.8lX\n", pID[0], hash[0], sig[1], sig[0]);
+
+    // e = Hash
+    // s = Signature
+	BIGNUM *e, *s;
+
+    // Put hash word into BigNum e.
+	e = BN_new();
+	BN_set_word(e, hash[0]);
+
+    // Reverse signature and create a new BigNum s.
+    endiannessConvert((unsigned char *) sig, sizeof(sig));
+	s = BN_bin2bn((unsigned char *)sig, sizeof(sig), nullptr);
+
+    // Create x and y.
+	BIGNUM *x = BN_new();
+	BIGNUM *y = BN_new();
+
+    // Create 2 new points on the existing elliptic curve.
+	EC_POINT *u = EC_POINT_new(ec);
+	EC_POINT *v = EC_POINT_new(ec);
+
+
+    // EC_POINT_mul calculates r = generator * n + q * m.
+	// v = s * generator + e * (-publicKey)
+
+    // u = generator * s
+	EC_POINT_mul(ec, u, nullptr, generator, s, ctx);
+
+    // v = publicKey * e
+	EC_POINT_mul(ec, v, nullptr, publicKey, e, ctx);
+
+    // v += u
+	EC_POINT_add(ec, v, u, v, ctx);
+
+    // EC_POINT_get_affine_coordinates() sets x and y, either of which may be NULL, to the corresponding coordinates of p.
+    // x = v.x; y = v.y;
+	EC_POINT_get_affine_coordinates(ec, v, x, y, ctx);
+
+
+	unsigned char buf[FIELD_BYTES], md[SHA_DIGEST_LENGTH], t[4];
+	unsigned long h;
+
+	SHA_CTX hContext;
+	
+	/* h = (first 32 bits of SHA1(pID || v.x, v.y)) >> 4 */
+	SHA1_Init(&hContext);
+
+    // Chop Product ID into 4 bytes.
+	t[0] = pID[0] & 0xff;                   // First 8 bits
+	t[1] = (pID[0] & 0xff00) >> 8;          // Second 8 bits
+	t[2] = (pID[0] & 0xff0000) >> 16;       // Third 8 bits
+	t[3] = (pID[0] & 0xff000000) >> 24;     // Fourth 8 bits
+
+    // Hash chunk of data.
+	SHA1_Update(&hContext, t, sizeof(t));
+
+    // Empty buffer, place v.x in little-endian.
+	memset(buf, 0, sizeof(buf));
+	BN_bn2bin(x, buf);
+    endiannessConvert((unsigned char *) buf, sizeof(buf));
+
+    // Hash chunk of data.
+	SHA1_Update(&hContext, buf, sizeof(buf));
+
+    // Empty buffer, place v.y in little-endian.
+	memset(buf, 0, sizeof(buf));
+	BN_bn2bin(y, buf);
+    endiannessConvert((unsigned char *) buf, sizeof(buf));
+
+    // Hash chunk of data.
+	SHA1_Update(&hContext, buf, sizeof(buf));
+
+    // Store the final message from hContext in md.
+	SHA1_Final(md, &hContext);
+
+    // h = (first 32 bits of SHA1(pID || v.x, v.y)) >> 4
+	h = (md[0] | (md[1] << 8) | (md[2] << 16) | (md[3] << 24)) >> 4;
+	h &= 0xfffffff;
+	
+	printf("Calculated hash: %.8lX\n", h);
+
+    // If we managed to generateKey a key with the same hash, the key is correct.
+	if (h == hash[0]) cprintf("Key valid\n", 0x0A);
+	else cprintf("Key invalid\n", 0x0C);
+
+	putchar('\n');
+	
+	BN_free(e);
+	BN_free(s);
+	BN_free(x);
+	BN_free(y);
+
+    BN_CTX_free(ctx);
+
+	EC_POINT_free(u);
+	EC_POINT_free(v);
+}
+
+/* Generate a valid Product Key. */
+void generateKey(unsigned char *pKey, EC_GROUP *eCurve, EC_POINT *generator, BIGNUM *order, BIGNUM *privateKey, unsigned long *pRaw) {
+    EC_POINT *r = EC_POINT_new(eCurve);
+    BN_CTX *ctx = BN_CTX_new();
+
+	BIGNUM *c = BN_new();
+	BIGNUM *s = BN_new();
+	BIGNUM *x = BN_new();
+	BIGNUM *y = BN_new();
+
+	unsigned long bKey[4];
+
+	do {
+        // Generate a random number c consisting of 384 bits without any constraints.
+		BN_rand(c, FIELD_BITS, BN_RAND_TOP_ANY, BN_RAND_BOTTOM_ANY);
+
+        // r = generator * c;
+		EC_POINT_mul(eCurve, r, NULL, generator, c, ctx);
+
+        // x = r.x; y = r.y;
+		EC_POINT_get_affine_coordinates(eCurve, r, x, y, ctx);
+		
+		SHA_CTX hContext;
+		unsigned char md[SHA_DIGEST_LENGTH], buf[FIELD_BYTES], t[4];
+		unsigned long hash[1];
+
+        /* h = (fist 32 bits of SHA1(pRaw || r.x, r.y)) >> 4 */
+		SHA1_Init(&hContext);
+
+        // Chop Raw Product Key into 4 bytes.
+		t[0] = pRaw[0] & 0xff;
+		t[1] = (pRaw[0] & 0xff00) >> 8;
+		t[2] = (pRaw[0] & 0xff0000) >> 16;
+		t[3] = (pRaw[0] & 0xff000000) >> 24;
+
+        // Hash chunk of data.
+		SHA1_Update(&hContext, t, sizeof(t));
+
+        // Empty buffer, place r.x in little-endian.
+		memset(buf, 0, sizeof(buf));
+		BN_bn2bin(x, buf);
+        endiannessConvert((unsigned char *) buf, sizeof(buf));
+
+        // Hash chunk of data.
+		SHA1_Update(&hContext, buf, sizeof(buf));
+
+        // Empty buffer, place r.y in little-endian.
+		memset(buf, 0, sizeof(buf));
+		BN_bn2bin(y, buf);
+        endiannessConvert((unsigned char *) buf, sizeof(buf));
+
+        // Hash chunk of data.
+		SHA1_Update(&hContext, buf, sizeof(buf));
+
+        // Store the final message from hContext in md.
+		SHA1_Final(md, &hContext);
+
+        // h = (First-32(SHA1(pRaw, r.x, r.y)) >> 4
+		hash[0] = (md[0] | (md[1] << 8) | (md[2] << 16) | (md[3] << 24)) >> 4;
+		hash[0] &= 0xfffffff;
+		
+		/* s = privateKey * hash + c; */
+        // s = privateKey;
+		BN_copy(s, privateKey);
+
+        // s *= hash;
+        BN_mul_word(s, hash[0]);
+
+        // BN_mod_add() adds a to b % m and places the non-negative result in r.
+        // s = |s + c % order|;
+		BN_mod_add(s, s, c, order, ctx);
+
+        // Convert s from BigNum back to bytecode and reverse the endianness.
+		unsigned long sig[2]{};
+
+		BN_bn2bin(s, (unsigned char *)sig);
+        endiannessConvert((unsigned char *) sig, BN_num_bytes(s));
+
+        // Pack product key.
+		pack(bKey, pRaw, hash, sig);
+
+		printf("PID: %.8lX\nHash: %.8lX\nSignature: %.8lX %.8lX\n\n", pRaw[0], hash[0], sig[1], sig[0]);
+	} while (bKey[3] >= 0x62A32); // Loop in case signature part will make the CD-key longer than 25 characters.
+
+    // Convert the key to Base24.
+	base24(pKey, bKey);
+	
+	BN_free(c);
+	BN_free(s);
+	BN_free(x);
+	BN_free(y);
+
+    BN_CTX_free(ctx);
+	EC_POINT_free(r);
+}
+
+
+/*
+ * PK: VX8CG-8KC6V-PVPMD-GKPPH-GC7W8
+ *
+ * The Windows XP product key is composed of 25 characters. The dashes store no information.
+ * The product key is encoded in Base24 with an alphabet of "BCDFGHJKMPQRTVWXY2346789" in order
+ * to avoid ambiguous characters (e.g. "I" and "1", "0" and "O").
+ *
+ * To convert a 25-digit key to binary data, we need to:
+ * 1. Think of the key as of an array of bytes. Then convert the concatenated key VX8CG8KC6VPVPMDGKPPHGC7W8
+ *    into its Base24 representation ('B' = 0, 'C' = 1, 'D' = 2, ...) -> [ 13, 15, 22, 1, 4, ... ].
+ * 2. Compute the decoded array in little-endian.
+ * 3. The decoded result is divided into sections:
+ *    - 12 bits -> OS Family
+ *    - 31 bits -> Hash
+ *    - 62 bits -> Signature
+ *    -  9 bits -> Prefix
+ *
+ * Product ID: AAAAA-BBB-CCCCCCC-DDEEE
+ *
+ *  digits |  length | encoding
+ * --------+---------+---------------------------------------
+ *   AAAAA | 17 bits | bit  0 to bit 16 of P1
+ *     BBB | 10 bits | bit 17 to bit 26 of P1
+ * CCCCCCC | 28 bits | bit 27 to bit 31 of P1 (lower  5 bits)
+ *         |         | bit  0 to bit 22 of P2 (upper 23 bits)
+ *   DDEEE | 17 bits | bit 23 to bit 31 of P2 (lower  9 bits)
+ *         |         | bit  0 to bit  7 of P3 (upper  8 bits)
+ *
+ *  digits | meaning
+ * --------+-------------------------------------------------
+ *   AAAAA | apparently always 55034 (in Windows XP RC1)
+ *     BBB | most significant three digits of Raw Product Key
+ *         | (see below)
+ * CCCCCCC | least significant six digits of Raw Product Key
+ *         | plus check digit (see below)
+ *      DD | index of the public key used to verify the
+ *         | Product Key. Example: 22 for PRO version and 23 for VLK version
+ *     EEE | random value (used for phone activation, different installation IDs are generated)
+ */
+
+
+int main() {
+    hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
+
+    // Initialize BIGNUM and BIGNUMCTX structures.
+    // BIGNUM - Large numbers
+    // BIGNUMCTX - Context large numbers (temporary)
+	BIGNUM *a, *b, *p, *generatorX, *generatorY, *publicKeyX, *publicKeyY, *genOrder, *privateKey;
+	BN_CTX *context;
+
+    // Microsoft Product Key identification program uses a public key stored in pidgen.dll's BINK resource,
+    // which is an Elliptic Curve Cryptography (ECC) public key. It can be decomposed into a following mathematical task:
+
+    // We're presented with an elliptic curve, a multivariable function y(x; p; a; b), where
+    // y^2 % p = x^3 + ax + b % p.
+	a = BN_new();
+	b = BN_new();
+	p = BN_new();
+
+    // Public key will consist of the resulting (x; y) values.
+    publicKeyX = BN_new();
+    publicKeyY = BN_new();
+
+    // G(x; y) is a generator function, its return value represents a point on the elliptic curve.
+    generatorX = BN_new();
+    generatorY = BN_new();
+
+    // We cannot produce a valid key without knowing the private key k. The reason for this is that
+    // we need the result of the function K(x; y) = kG(x; y).
+    privateKey = BN_new();
+
+    // We can, however, validate any given key using the available public key: {p, a, b, G, K}.
+    // genOrder the order of the generator G, a value we have to reverse -> Schoof's Algorithm.
+	genOrder = BN_new();
+
+    // Context variable
+    context = BN_CTX_new();
+
+
+    /* Public data */
+    // Data taken from pidgen.dll BINK-resources
+	BN_hex2bn(&p, "92ddcf14cb9e71f4489a2e9ba350ae29454d98cb93bdbcc07d62b502ea12238ee904a8b20d017197aae0c103b32713a9");
+
+    BN_set_word(a, 1);
+	BN_set_word(b, 0);
+
+	// Base point G (Generator)
+	BN_hex2bn(&generatorX, "46E3775ECE21B0898D39BEA57050D422A0AF989E497962BAEE2CB17E0A28D5360D5476B8DC966443E37A14F1AEF37742");
+	BN_hex2bn(&generatorY, "7C8E741D2C34F4478E325469CD491603D807222C9C4AC09DDB2B31B3CE3F7CC191B3580079932BC6BEF70BE27604F65E");
+
+	// Inverse of the public key
+	BN_hex2bn(&publicKeyX, "5D8DBE75198015EC41C45AAB6143542EB098F6A5CC9CE4178A1B8A1E7ABBB5BC64DF64FAF6177DC1B0988AB00BA94BF8");
+	BN_hex2bn(&publicKeyY, "23A2909A0B4803C89F910C7191758B48746CEA4D5FF07667444ACDB9512080DBCA55E6EBF30433672B894F44ACE92BFA");
+
+
+    /* Computed data */
+	// The order of G was computed in 18 hours using a Pentium III 450
+	BN_hex2bn(&genOrder, "DB6B4C58EFBAFD");
+
+	// The private key was computed in 10 hours using a Pentium III 450
+	BN_hex2bn(&privateKey, "565B0DFF8496C8");
+
+
+    /* Elliptical Curve calculations. */
+    // The group is defined via Fp = all integers [0; p - 1], where p is prime.
+    // The function EC_POINT_set_affine_coordinates() sets the x and y coordinates for the point p defined over the curve given in group.
+	EC_GROUP *eCurve = EC_GROUP_new_curve_GFp(p, a, b, context);
+
+    // Create new point for the generator on the elliptic curve and set its coordinates to (genX; genY).
+	EC_POINT *genPoint = EC_POINT_new(eCurve);
+    EC_POINT_set_affine_coordinates(eCurve, genPoint, generatorX, generatorY, context);
+
+    // Create new point for the public key on the elliptic curve and set its coordinates to (pubX; pubY).
+	EC_POINT *pub = EC_POINT_new(eCurve);
+	EC_POINT_set_affine_coordinates(eCurve, pub, publicKeyX, publicKeyY, context);
+
+
+    /* Generate a key. */
+	unsigned char pKey[26]{};
+	unsigned long pRaw[1]{};
+
+    /*
+     * Decoding the Product Key results in an example byte sequence.
+     *
+     * 0x6F 0xFA 0x95 0x45 0xFC 0x75 0xB5 0x52 0xBB 0xEF 0xB1 0x17 0xDA 0xCD 0x00
+     *
+     * Of these 15 bytes the least significant four bytes contain the Raw
+     * Product Key in little endian byte order. The least significant bit is
+     * removed by shifting this 32-bit value (0x4595FA6F - remember the
+     * little endian byte order) to the left by one bit position, resulting
+     * in a Raw Product Key of 0x22CAFD37, or
+     *
+     *      583728439
+     *
+     * in decimal notation.
+     */
+
+    SetConsoleTitleA("Windows XP VLK Keygen");
+
+    system("cls");
+    cprintf("Windows XP VLK Keygen\n\n", 0x08);
+
+    cprintf("Principle of Operation:\n", 0x0C);
+    printf("We need a valid Raw Product Key to generate the Product ID in form of AAAAA-BBB-CCCCCCS-DDEEE.\n\n");
+    printf("AAAAA is the Windows XP Series constant - different for each version.\n");
+    printf("Raw Product Key directly represents the BBB-CCCCCC part of the Product ID.\n");
+    printf("S is a \"check bit\": it's picked so that the sum of all C digits with it added makes a number divisble by 7.\n");
+    printf("DD is the index of the public key used to verify the Product Key.\n");
+    printf("EEE is a random number used to generate a different Installation ID each time.\n\n");
+
+    printf("The Product Key itself can at most contain 114 bits of information, as per the alphabet capacity formula.\n");
+    printf("Based on that, we unpack the 114-bit Raw Product Key into 3 ordered segments:\n");
+    printf("\tData (31 bits), Hash (28 bits) and Signature (55 bits).\n\n");
+    printf("Microsoft uses a really elegant Elliptic Curve Algorithm to validate the product keys.\n");
+    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");
+    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");
+    printf("In general, there are 2 special cases for the Elliptic Curve leveraged in cryptography - F2m and Fp.\nMicrosoft used the latter.\n");
+    printf("\ty^2 = x^3 + ax + b %% p.\n");
+    printf("The task boils down to generating a valid Hash/Signature pair for the Raw Key we provided:\n");
+    printf("\t1. We need to generate a random 384-bit number r, and define C = R(r.x, r.y) = rG.\n");
+    printf("\t2. Hash = (First32Bits(SHA1(pRaw, r.x, r.y)) >> 4.\n");
+    printf("\t3. Signature = privateKey * Hash + (C %% Order)\n");
+    printf("Finally, we pack these components together, convert them to Base24 and get a valid Windows XP key.\n");
+
+    cprintf("Input Raw Product Key BBB-CCCCCC WITHOUT DASHES in range [100-000000; 999-999999]: ", 0x0E);
+    scanf_s("%lu", pRaw);
+
+    printf("\n");
+
+    pRaw[0] <<= 1;
+
+
+    for (int i = 0; i < 10; i++) {
+        cprintf("Product Key %d:\n", 0x08, i + 1);
+
+        generateKey(pKey, eCurve, genPoint, genOrder, privateKey, pRaw);
+        printProductKey(pKey);
+
+        printf("\n\n");
+
+        // Verify the key
+        verifyKey(eCurve, genPoint, pub, (char *) pKey);
+    }
+
+	
+    // Cleanup
+	BN_CTX_free(context);
+	
+	return 0;
+}
diff --git a/openssl/c_rehash.pl b/openssl/c_rehash.pl
new file mode 100644
index 0000000..a98cffd
--- /dev/null
+++ b/openssl/c_rehash.pl
@@ -0,0 +1,252 @@
+#!/usr/bin/env perl
+
+# WARNING: do not edit!
+# Generated by makefile from tools\c_rehash.in
+# Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the Apache License 2.0 (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
+# Perl c_rehash script, scan all files in a directory
+# and add symbolic links to their hash values.
+
+my $dir = "";
+my $prefix = "";
+
+my $errorcount = 0;
+my $openssl = $ENV{OPENSSL} || "openssl";
+my $pwd;
+my $x509hash = "-subject_hash";
+my $crlhash = "-hash";
+my $verbose = 0;
+my $symlink_exists=eval {symlink("",""); 1};
+my $removelinks = 1;
+
+##  Parse flags.
+while ( $ARGV[0] =~ /^-/ ) {
+    my $flag = shift @ARGV;
+    last if ( $flag eq '--');
+    if ( $flag eq '-old') {
+        $x509hash = "-subject_hash_old";
+        $crlhash = "-hash_old";
+    } elsif ( $flag eq '-h' || $flag eq '-help' ) {
+        help();
+    } elsif ( $flag eq '-n' ) {
+        $removelinks = 0;
+    } elsif ( $flag eq '-v' ) {
+        $verbose++;
+    }
+    else {
+        print STDERR "Usage error; try -h.\n";
+        exit 1;
+    }
+}
+
+sub help {
+    print "Usage: c_rehash [-old] [-h] [-help] [-v] [dirs...]\n";
+    print "   -old use old-style digest\n";
+    print "   -h or -help print this help text\n";
+    print "   -v print files removed and linked\n";
+    exit 0;
+}
+
+eval "require Cwd";
+if (defined(&Cwd::getcwd)) {
+    $pwd=Cwd::getcwd();
+} else {
+    $pwd=`pwd`;
+    chomp($pwd);
+}
+
+# DOS/Win32 or Unix delimiter?  Prefix our installdir, then search.
+my $path_delim = ($pwd =~ /^[a-z]\:/i) ? ';' : ':';
+$ENV{PATH} = "$prefix/bin" . ($ENV{PATH} ? $path_delim . $ENV{PATH} : "");
+
+if (! -x $openssl) {
+    my $found = 0;
+    foreach (split /$path_delim/, $ENV{PATH}) {
+        if (-x "$_/$openssl") {
+            $found = 1;
+            $openssl = "$_/$openssl";
+            last;
+        }
+    }
+    if ($found == 0) {
+        print STDERR "c_rehash: rehashing skipped ('openssl' program not available)\n";
+        exit 0;
+    }
+}
+
+if (@ARGV) {
+    @dirlist = @ARGV;
+} elsif ($ENV{SSL_CERT_DIR}) {
+    @dirlist = split /$path_delim/, $ENV{SSL_CERT_DIR};
+} else {
+    $dirlist[0] = "$dir/certs";
+}
+
+if (-d $dirlist[0]) {
+    chdir $dirlist[0];
+    $openssl="$pwd/$openssl" if (!-x $openssl);
+    chdir $pwd;
+}
+
+foreach (@dirlist) {
+    if (-d $_ ) {
+        if ( -w $_) {
+            hash_dir($_);
+        } else {
+            print "Skipping $_, can't write\n";
+            $errorcount++;
+        }
+    }
+}
+exit($errorcount);
+
+sub copy_file {
+    my ($src_fname, $dst_fname) = @_;
+
+    if (open(my $in, "<", $src_fname)) {
+        if (open(my $out, ">", $dst_fname)) {
+            print $out $_ while (<$in>);
+            close $out;
+        } else {
+            warn "Cannot open $dst_fname for write, $!";
+        }
+        close $in;
+    } else {
+        warn "Cannot open $src_fname for read, $!";
+    }
+}
+
+sub hash_dir {
+    my $dir = shift;
+    my %hashlist;
+
+    print "Doing $dir\n";
+
+    if (!chdir $dir) {
+        print STDERR "WARNING: Cannot chdir to '$dir', $!\n";
+        return;
+    }
+
+    opendir(DIR, ".") || print STDERR "WARNING: Cannot opendir '.', $!\n";
+    my @flist = sort readdir(DIR);
+    closedir DIR;
+    if ( $removelinks ) {
+        # Delete any existing symbolic links
+        foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
+            if (-l $_) {
+                print "unlink $_\n" if $verbose;
+                unlink $_ || warn "Can't unlink $_, $!\n";
+            }
+        }
+    }
+    FILE: foreach $fname (grep {/\.(pem|crt|cer|crl)$/} @flist) {
+        # Check to see if certificates and/or CRLs present.
+        my ($cert, $crl) = check_file($fname);
+        if (!$cert && !$crl) {
+            print STDERR "WARNING: $fname does not contain a certificate or CRL: skipping\n";
+            next;
+        }
+        link_hash_cert($fname) if ($cert);
+        link_hash_crl($fname) if ($crl);
+    }
+
+    chdir $pwd;
+}
+
+sub check_file {
+    my ($is_cert, $is_crl) = (0,0);
+    my $fname = $_[0];
+
+    open(my $in, "<", $fname);
+    while(<$in>) {
+        if (/^-----BEGIN (.*)-----/) {
+            my $hdr = $1;
+            if ($hdr =~ /^(X509 |TRUSTED |)CERTIFICATE$/) {
+                $is_cert = 1;
+                last if ($is_crl);
+            } elsif ($hdr eq "X509 CRL") {
+                $is_crl = 1;
+                last if ($is_cert);
+            }
+        }
+    }
+    close $in;
+    return ($is_cert, $is_crl);
+}
+
+sub compute_hash {
+    my $fh;
+    if ( $^O eq "VMS" ) {
+        # VMS uses the open through shell
+        # The file names are safe there and list form is unsupported
+        if (!open($fh, "-|", join(' ', @_))) {
+            print STDERR "Cannot compute hash on '$fname'\n";
+            return;
+        }
+    } else {
+        if (!open($fh, "-|", @_)) {
+            print STDERR "Cannot compute hash on '$fname'\n";
+            return;
+        }
+    }
+    return (<$fh>, <$fh>);
+}
+
+# Link a certificate to its subject name hash value, each hash is of
+# the form <hash>.<n> where n is an integer. If the hash value already exists
+# then we need to up the value of n, unless its a duplicate in which
+# case we skip the link. We check for duplicates by comparing the
+# certificate fingerprints
+
+sub link_hash_cert {
+    link_hash($_[0], 'cert');
+}
+
+# Same as above except for a CRL. CRL links are of the form <hash>.r<n>
+
+sub link_hash_crl {
+    link_hash($_[0], 'crl');
+}
+
+sub link_hash {
+    my ($fname, $type) = @_;
+    my $is_cert = $type eq 'cert';
+
+    my ($hash, $fprint) = compute_hash($openssl,
+                                       $is_cert ? "x509" : "crl",
+                                       $is_cert ? $x509hash : $crlhash,
+                                       "-fingerprint", "-noout",
+                                       "-in", $fname);
+    chomp $hash;
+    $hash =~ s/^.*=// if !$is_cert;
+    chomp $fprint;
+    return if !$hash;
+    $fprint =~ s/^.*=//;
+    $fprint =~ tr/://d;
+    my $suffix = 0;
+    # Search for an unused hash filename
+    my $crlmark = $is_cert ? "" : "r";
+    while(exists $hashlist{"$hash.$crlmark$suffix"}) {
+        # Hash matches: if fingerprint matches its a duplicate cert
+        if ($hashlist{"$hash.$crlmark$suffix"} eq $fprint) {
+            my $what = $is_cert ? 'certificate' : 'CRL';
+            print STDERR "WARNING: Skipping duplicate $what $fname\n";
+            return;
+        }
+        $suffix++;
+    }
+    $hash .= ".$crlmark$suffix";
+    if ($symlink_exists) {
+        print "link $fname -> $hash\n" if $verbose;
+        symlink $fname, $hash || warn "Can't symlink, $!";
+    } else {
+        print "copy $fname -> $hash\n" if $verbose;
+        copy_file($fname, $hash);
+    }
+    $hashlist{$hash} = $fprint;
+}
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