bool verify(CryptoPP::ECPPoint Q, byte *message, unsigned message_length, CryptoPP::Integer r, CryptoPP::Integer s){
auto ec = common::ec_parameters().GetCurve();
auto G = common::ec_parameters().GetSubgroupGenerator();
auto n = common::ec_parameters().GetGroupOrder();
Integer z = hash_m_to_int(message, message_length, n.ByteCount());
// verify
if (Q == ec.Identity()){
cerr << "Q == O" << endl;
return false;
}
if (!(ec.Multiply(n, Q) == ec.Identity())){
cerr << "n x Q != O" << endl;
return false;
}
if (r <= 0 || r >= n){
cerr << "incorrect r" << endl;
return false;
}
if (s <= 0 || s >= n){
cerr << "incorrect s" << endl;
return false;
}
Integer w = s.InverseMod(n);
Integer u1 = a_times_b_mod_c(z, w, n);
Integer u2 = a_times_b_mod_c(r, w, n);
ECPPoint P2 = ec.Add(ec.Multiply(u1, G), ec.Multiply(u2, Q));
if (P2.x != r){
cerr << "P2.x != r" << endl;
return false;
}
return true;
}
MALIB_API SURFACE::SURFACE(const string name, void* data, uint width, uint height, PIXELFORMAT format)
{
this->data = data;
this->name = name;
this->width = width;
this->height = height;
this->byteCount = ByteCount(format);
this->format = format;
}
MALIB_API SURFACE::SURFACE(const string name, uint width, uint height, PIXELFORMAT format)
{
this->data = 0;
this->name = name;
this->width = width;
this->height = height;
this->format = format;
this->byteCount = ByteCount(format);
uint size = this->width * this->height * this->byteCount;
this->data = new uchar[size];
memset((void*)this->data, 0, size * sizeof(uchar));
}
TUint64 CSISController::ControllerSizeForHash() const
{
TUint64 ctlSize = ByteCount(false);
TUint64 size = ctlSize - iSignatures.ByteCountWithHeader(false) - iDataIndex.ByteCountWithHeader(false);
if(CSISHeader::IsBigHeader(ctlSize))
{
size += 8;
}
else
{
size += 4;
}
return size;
}
/**
* Creates a new buffer containing the big-endian binary representation of this
* integer.
*
* Note that it does not support the exporting of negative integers.
*
* @return The new buffer.
*
* @leave KErrNegativeExportNotSupported If this instance is a negative integer.
*
*/
EXPORT_C HBufC8* TInteger::BufferLC() const
{
if(IsNegative())
{
User::Leave(KErrNegativeExportNotSupported);
}
TUint bytes = ByteCount();
HBufC8* buf = HBufC8::NewMaxLC(bytes);
TUint8* bufPtr = (TUint8*)(buf->Ptr());
TUint8* regPtr = (TUint8*)Ptr();
// we internally store the number little endian, as a string we want it big
// endian
for(TUint i=0,j=bytes-1; i<bytes; )
{
bufPtr[i++] = regPtr[j--];
}
return buf;
}