// license that can be found in the LICENSE file.

package elliptic

import (
	"math/big"
	"testing"
)

type scalarMultTest struct {
	k          string
	xIn, yIn   string
	xOut, yOut string
}

var p256MultTests = []scalarMultTest{
	{
		"2a265f8bcbdcaf94d58519141e578124cb40d64a501fba9c11847b28965bc737",
		"023819813ac969847059028ea88a1f30dfbcde03fc791d3a252c6b41211882ea",

func (curve *CurveParams) affineFromJacobian(x, y, z *big.Int) (xOut, yOut *big.Int) {
	if z.Sign() == 0 {
		return new(big.Int), new(big.Int)
	}

	zinv := new(big.Int).ModInverse(z, curve.P)
	zinvsq := new(big.Int).Mul(zinv, zinv)

	xOut = new(big.Int).Mul(x, zinvsq)
	xOut.Mod(xOut, curve.P)
	zinvsq.Mul(zinvsq, zinv)
	yOut = new(big.Int).Mul(y, zinvsq)
	yOut.Mod(yOut, curve.P)
	return
}

// Add implements [Curve.Add].

		err := arbitraryValues(arguments, xType, config, rand)
		if err != nil {
			return err
		}

		xOut := toInterfaces(x.Call(arguments))
		yOut := toInterfaces(y.Call(arguments))

		if !reflect.DeepEqual(xOut, yOut) {
			return &CheckEqualError{CheckError{i + 1, toInterfaces(arguments)}, xOut, yOut}
		}
	}

	return nil
}

// arbitraryValues writes Values to args such that args contains Values

	LDacc (u2)
	CALL p256SubInternal(SB)

	LDt (r)
	CALL p256MulInternal(SB)

	LDt (s2)
	CALL p256SubInternal(SB)
	ST (yout)

	MOVOU xout(16*0), X0
	MOVOU xout(16*1), X1
	MOVOU yout(16*0), X2
	MOVOU yout(16*1), X3
	MOVOU zout(16*0), X4
	MOVOU zout(16*1), X5
	// Finally output the result
	MOVQ rptr, AX
	MOVQ $0, rptr
	MOVOU X0, (16*0)(AX)
	MOVOU X1, (16*1)(AX)

> Quelle est l'histoire de ce projet ? Il semble être sorti de nulle part et est devenu génial en quelques semaines [...].

Voici un petit bout de cette histoire.

## Alternatives

#include <iostream>

int main () {
    #if defined(__clang__)
        std::cout << "Hello from clang!" << std::endl;
    #elif defined(__GNUC__) && defined(__MINGW32__)
        std::cout << "Hello from mingw!" << std::endl;
    #elif defined(__GNUC__) && defined(__CYGWIN__)
        std::cout << "Hello from gcc cygwin!" << std::endl;
    #elif defined(__GNUC__)
        std::cout << "Hello from gcc!" << std::endl;
    #elif defined(_MSC_VER)

	olp := log.Prefix()

	// Revert the original log settings before we exit.
	defer func() {
		log.SetFlags(olf)
		log.SetPrefix(olp)
		log.SetOutput(olw)
	}()

	lOut := new(strings.Builder)
	log.SetPrefix("lw: ")
	log.SetOutput(lOut)
	log.SetFlags(0)

	lw := new(strings.Builder)
	wl := NewWriteLogger("write:", lw)
	if _, err := wl.Write([]byte("Hello, World!")); err != nil {

    #if defined(__x86_64__) || defined(_M_X64)
    cout << "amd64";
    #elif defined(__i386) || defined(_M_IX86)
    cout << "i386";
    #elif defined(_M_IA64)
    cout << "itanium";
    #else
    cout << "unknown";
    #endif
    cout << " ";

    #if defined(__linux__)
    cout << "linux";
    #elif defined(__APPLE__) && defined(__MACH__)
    cout << "os x";

#endif

#ifdef GOPPC64_power9
#define SETB_CR0(rout) SETB CR0, rout
#define SETB_CR1(rout) SETB CR1, rout
#define SETB_INIT()
#define SETB_CR0_NE(rout) SETB_CR0(rout)
#else
// A helper macro to emulate SETB on P8. This assumes
// -1 is in R20, and 1 is in R21. crxlt and crxeq must
// also be the same CR field.
#define _SETB(crxlt, crxeq, rout) \
	ISEL	crxeq,R0,R21,rout \
	ISEL	crxlt,R20,rout,rout

// to the rotation schedule.
func ksRotate(in uint32) (out []uint32) {
	out = make([]uint32, 16)
	last := in
	for i := 0; i < 16; i++ {
		// 28-bit circular left shift
		left := (last << (4 + ksRotations[i])) >> 4
		right := (last << 4) >> (32 - ksRotations[i])
		out[i] = left | right
		last = out[i]
	}
	return
}

// creates 16 56-bit subkeys from the original key.