114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
//
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// Created by Andrew on 09/04/2023.
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//
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#include "header.h"
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/* Convert from byte sequence to the CD-key. */
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void base24(char *cdKey, ul32 *byteSeq) {
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byte rbs[16];
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BIGNUM *z;
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// Copy byte sequence to the reversed byte sequence.
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memcpy(rbs, byteSeq, sizeof(rbs));
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// Skip trailing zeroes and reverse y.
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int length;
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for (length = 15; rbs[length] == 0; length--);
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endiannessConvert(rbs, ++length);
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// Convert reversed byte sequence to BigNum z.
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z = BN_bin2bn(rbs, length, nullptr);
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// Divide z by 24 and convert the remainder to a CD-key char.
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cdKey[25] = 0;
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for (int i = 24; i >= 0; i--)
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cdKey[i] = charset[BN_div_word(z, 24)];
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BN_free(z);
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}
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/* Convert from CD-key to a byte sequence. */
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void unbase24(ul32 *byteSeq, const char *cdKey) {
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byte pDecodedKey[PK_LENGTH + NULL_TERMINATOR]{};
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BIGNUM *y = BN_new();
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BN_zero(y);
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// Remove dashes from the CD-key and put it into a Base24 byte array.
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for (int i = 0, k = 0; i < strlen(cdKey) && k < PK_LENGTH; i++) {
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for (int j = 0; j < 24; j++) {
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if (cdKey[i] != '-' && cdKey[i] == charset[j]) {
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pDecodedKey[k++] = j;
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break;
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}
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}
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}
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// Empty byte sequence.
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memset(byteSeq, 0, 16);
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// Calculate the weighed sum of byte array elements.
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for (int i = 0; i < PK_LENGTH; i++) {
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BN_mul_word(y, PK_LENGTH - 1);
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BN_add_word(y, pDecodedKey[i]);
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}
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// Acquire length.
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int n = BN_num_bytes(y);
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// Place the generated code into the byte sequence.
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BN_bn2bin(y, (byte *)byteSeq);
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BN_free(y);
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// Reverse the byte sequence.
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endiannessConvert((byte *) byteSeq, n);
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}
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/* Print Product Key. */
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void printProductKey(const char *pKey) {
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assert(strlen(pKey) == 25);
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SetConsoleTextAttribute(hConsole, 0x0A);
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for (int i = 0; i < PK_LENGTH; i++) {
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putchar(pKey[i]);
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if (i != PK_LENGTH - 1 && i % 5 == 4) putchar('-');
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}
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SetConsoleTextAttribute(hConsole, 0x0F);
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}
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/* Print Product ID using a Product Key. */
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void printProductID(const ul32 *pRaw) {
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char raw[12];
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char b[6], c[8];
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// Cut away last bit of the product key and convert it to an ASCII-number (=raw)
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sprintf(raw, "%09lu", pRaw[0] >> 1);
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// Make B-part {...-640-...} -> most significant 3 digits of Raw Product Key
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strncpy(b, raw, 3);
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b[3] = 0;
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// Make C-part {...-123456X-...} -> least significant 6 digits of Raw Product Key
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strcpy(c, raw + 3);
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int digit = 0;
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// Reverse sum algorithm to find a check digit that would add to the rest to form a sum divisible by 7.
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for (int i = 0; i < 6; i++)
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digit -= c[i] - '0';
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while (digit < 0)
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digit += 7;
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// Append check digit + null terminate.
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c[6] = digit + '0';
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c[7] = 0;
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printf("Product ID: ");
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cprintf("PPPPP-%s-%s-23XXX\n", 0x0E, b, c);
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} |