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Add pack/extract consistency

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This commit is contained in:
Andrew 2023-06-04 13:35:26 +03:00
parent 06920ede2a
commit 63bc103384
1 changed files with 14 additions and 14 deletions
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28
src/xp.cpp
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@ -18,32 +18,32 @@
#include "header.h"
/* Unpacks the Windows XP Product Key. */
void unpackXP(DWORD *serial, DWORD *hash, DWORD *sig, DWORD *raw) {
void unpackXP(DWORD *pRaw, DWORD *pSerial, DWORD *pHash, DWORD *pSignature) {
// 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
if (serial)
serial[0] = raw[0] & 0x7fffffff;
if (pSerial)
pSerial[0] = pRaw[0] & 0x7fffffff;
// Hash (e) = Bits [31..58] -> 28 bits
if (hash)
hash[0] = ((raw[0] >> 31) | (raw[1] << 1)) & 0xfffffff;
if (pHash)
pHash[0] = ((pRaw[0] >> 31) | (pRaw[1] << 1)) & 0xfffffff;
// Signature (s) = Bits [59..113] -> 55 bits
if (sig) {
sig[0] = (raw[1] >> 27) | (raw[2] << 5);
sig[1] = (raw[2] >> 27) | (raw[3] << 5);
if (pSignature) {
pSignature[0] = (pRaw[1] >> 27) | (pRaw[2] << 5);
pSignature[1] = (pRaw[2] >> 27) | (pRaw[3] << 5);
}
}
/* Packs the Windows XP Product Key. */
void packXP(DWORD *raw, const DWORD *serial, const DWORD *hash, const DWORD *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;
void packXP(DWORD *pRaw, const DWORD *pSerial, const DWORD *pHash, const DWORD *pSignature) {
pRaw[0] = pSerial[0] | ((pHash[0] & 1) << 31);
pRaw[1] = (pHash[0] >> 1) | ((pSignature[0] & 0x1f) << 27);
pRaw[2] = (pSignature[0] >> 5) | (pSignature[1] << 27);
pRaw[3] = pSignature[1] >> 5;
}
/* Verify Product Key */
@ -57,7 +57,7 @@ bool verifyXPKey(EC_GROUP *eCurve, EC_POINT *generator, EC_POINT *publicKey, cha
unbase24(bKey, cdKey);
// Extract data, hash and signature from the bytecode.
unpackXP(&pID, &checkHash, sig, bKey);
unpackXP(bKey, &pID, &checkHash, sig);
// e = Hash
// s = Signature