bool PointGFp::operator==(const PointGFp& other) const
{
if(m_curve != other.m_curve)
return false;
// If this is zero, only equal if other is also zero
if(is_zero())
return other.is_zero();
return (get_affine_x() == other.get_affine_x() &&
get_affine_y() == other.get_affine_y());
}
// encoding and decoding
secure_vector<uint8_t> EC2OSP(const PointGFp& point, uint8_t format)
{
if(point.is_zero())
return secure_vector<uint8_t>(1); // single 0 byte
const size_t p_bytes = point.get_curve().get_p().bytes();
BigInt x = point.get_affine_x();
BigInt y = point.get_affine_y();
secure_vector<uint8_t> bX = BigInt::encode_1363(x, p_bytes);
secure_vector<uint8_t> bY = BigInt::encode_1363(y, p_bytes);
if(format == PointGFp::UNCOMPRESSED)
{
secure_vector<uint8_t> result;
result.push_back(0x04);
result += bX;
result += bY;
return result;
}
else if(format == PointGFp::COMPRESSED)
{
secure_vector<uint8_t> result;
result.push_back(0x02 | static_cast<uint8_t>(y.get_bit(0)));
result += bX;
return result;
}
else if(format == PointGFp::HYBRID)
{
secure_vector<uint8_t> result;
result.push_back(0x06 | static_cast<uint8_t>(y.get_bit(0)));
result += bX;
result += bY;
return result;
}
else
throw Invalid_Argument("EC2OSP illegal point encoding");
}