void ror()
{
uint16_t a = GET_EAB;
uint8_t t = get_memb(a);
ror8(t);
set_memb(a, t);
}
void unshield_deobfuscate(unsigned char* buffer, size_t size, unsigned* seed)
{
unsigned tmp_seed = *seed;
for (; size > 0; size--, buffer++, tmp_seed++)
{
*buffer = ror8(*buffer ^ 0xd5, 2) - (tmp_seed % 0x47);
}
*seed = tmp_seed;
}
NC_LIBEXPORT(VOID) ncKeyShift(unsigned char* keybuf, int len)
{
for(int i = 0; i < (NC_ENC_PASSES - 1); i++)
{
bool f = false;
for(int l = 0; l < len; l++)
{
if(f)
rol8((unsigned char*)&keybuf[l], 2);
else
ror8((unsigned char*)&keybuf[2], 3);
f = !f;
}
}
}
NC_LIBEXPORT(VOID) ncCreateUsageKey(unsigned char* output, unsigned char* key, int len, int rora)
{
// Setup priv key
unsigned char apkey[NC_KEY_MAX_LENGTH];
memcpy(&apkey, &_ncEncPrivkey, NC_PRIV_KEY_LENGTH);
// Setup public key
unsigned char akey[NC_KEY_MAX_LENGTH];
memcpy(&akey, key, len);
// Expand keys
ncKeyExpand((unsigned char*)&apkey, NC_PRIV_KEY_LENGTH);
ncKeyExpand((unsigned char*)&akey[0], len);
// Create usage key
for(int ai = 0; ai < NC_KEY_MAX_LENGTH; ai++)
{
output[ai] = (apkey[ai] ^ akey[ai]) ^ 0xFF;
ror8(&output[ai], rora);
}
}
void rorb()
{
ror8(rb);
}
void rora()
{
ror8(ra);
}
