88 lines
2.5 KiB
C++
88 lines
2.5 KiB
C++
/**
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* This file is a part of the WindowsXPKg Project
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*
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* Copyleft (C) 2019-2023 WindowsXPKg Contributors (et.al.)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @FileCreated by Neo on 5/26/2023
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* @Maintainer Andrew
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*/
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#include "header.h"
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char pCharset[] = "BCDFGHJKMPQRTVWXY2346789";
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/* Converts from CD-key to a byte sequence. */
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void unbase24(BYTE *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] == pCharset[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, byteSeq);
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BN_free(y);
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// Reverse the byte sequence.
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endian(byteSeq, n);
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}
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/* Converts from byte sequence to the CD-key. */
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void base24(char *cdKey, BYTE *byteSeq) {
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BYTE rbyteSeq[16];
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BIGNUM *z;
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// Copy byte sequence to the reversed byte sequence.
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memcpy(rbyteSeq, byteSeq, sizeof(rbyteSeq));
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// Skip trailing zeroes and reverse y.
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int length;
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for (length = 15; rbyteSeq[length] == 0; length--);
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endian(rbyteSeq, ++length);
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// Convert reversed byte sequence to BigNum z.
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z = BN_bin2bn(rbyteSeq, 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] = pCharset[BN_div_word(z, 24)];
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BN_free(z);
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} |