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Fix pack functions

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This commit is contained in:
Andrew 2023-06-04 23:39:02 +03:00
parent 974695b178
commit 983acba760
1 changed files with 25 additions and 14 deletions
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39
src/server.cpp
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@ -6,30 +6,41 @@
char pCharset[] = "BCDFGHJKMPQRTVWXY2346789";
void unpackServer(DWORD *osFamily, DWORD *hash, DWORD *sig, DWORD *prefix, DWORD *raw) {
void unpackServer(
DWORD (&pRaw)[4],
DWORD &pChannelID,
DWORD &pHash,
DWORD (&pSignature)[2],
DWORD &pAuthInfo
) {
// We're assuming that the quantity of information within the product key is at most 114 bits.
// log2(24^25) = 114.
// OS Family = Bits [0..10] -> 11 bits
osFamily[0] = raw[0] & 0x7ff;
pChannelID = pRaw[0] & 0x7ff;
// Hash = Bits [11..41] -> 31 bits
hash[0] = ((raw[0] >> 11) | (raw[1] << 21)) & 0x7fffffff;
pHash = ((pRaw[0] >> 11) | (pRaw[1] << 21)) & 0x7fffffff;
// Signature = Bits [42..103] -> 62 bits
sig[0] = (raw[1] >> 10) | (raw[2] << 22);
sig[1] = ((raw[2] >> 10) | (raw[3] << 22)) & 0x3fffffff;
pSignature[0] = (pRaw[1] >> 10) | (pRaw[2] << 22);
pSignature[1] = ((pRaw[2] >> 10) | (pRaw[3] << 22)) & 0x3fffffff;
// Prefix = Bits [104..113] -> 10 bits
prefix[0] = (raw[3] >> 8) & 0x3ff;
pAuthInfo = (pRaw[3] >> 8) & 0x3ff;
}
void packServer(DWORD *raw, DWORD *osFamily, DWORD *hash, DWORD *sig, DWORD *prefix) {
raw[0] = osFamily[0] | (hash[0] << 11);
raw[1] = (hash[0] >> 21) | (sig[0] << 10);
raw[2] = (sig[0] >> 22) | (sig[1] << 10);
raw[3] = (sig[1] >> 22) | (prefix[0] << 8);
void packServer(
DWORD (&pRaw)[4],
DWORD pChannelID,
DWORD pHash,
DWORD (&pSignature)[2],
DWORD pAuthInfo
) {
pRaw[0] = pChannelID | (pHash << 11);
pRaw[1] = (pHash >> 21) | (pSignature[0] << 10);
pRaw[2] = (pSignature[0] >> 22) | (pSignature[1] << 10);
pRaw[3] = (pSignature[1] >> 22) | (pAuthInfo << 8);
}
@ -43,7 +54,7 @@ bool verifyServerKey(EC_GROUP *eCurve, EC_POINT *generator, EC_POINT *publicKey,
unbase24((BYTE *)bKey, cdKey);
// Extract segments from the bytecode and reverse the signature.
unpackServer(&osFamily, &hash, sig, &prefix, bKey);
unpackServer(bKey, osFamily, hash, sig, prefix);
endian((BYTE *)sig, 8);
BYTE t[FIELD_BYTES_2003]{}, md[SHA_DIGEST_LENGTH]{};
@ -297,7 +308,7 @@ void generateServerKey(char *pKey, EC_GROUP *eCurve, EC_POINT *generator, BIGNUM
endian((BYTE *)bSig, BN_num_bytes(s));
// Pack product key.
packServer(bKey, osFamily, &hash, bSig, prefix);
packServer(bKey, *osFamily, hash, bSig, *prefix);
BN_free(c);
BN_free(s);