ecurve_add

ecurve_add定义在miracl.h

extern int  ecurve_add(_MIPT_ epoint *,epoint *);

函数功能：椭圆曲线上的两个点相加，pa=pa+p。

参数_MIPD_：可能为空，非空为miracl *类型。

参数p：椭圆曲线上的点。

参数pa：椭圆曲线上的点。

1. 源码分析

ecurve_add实现在mrcurve.c

int ecurve_add(_MIPD_ epoint *p,epoint *pa)
{  /* pa=pa+p; */

#ifdef MR_OS_THREADS
    miracl *mr_mip=get_mip();
#endif
    if (mr_mip->ERNUM) return MR_OVER;

    MR_IN(94)

    if (p==pa) 
    {
        ecurve_double(_MIPP_ pa);
        MR_OUT
        if (pa->marker==MR_EPOINT_INFINITY) return MR_OVER;
        return MR_DOUBLE;
    }
    if (pa->marker==MR_EPOINT_INFINITY)
    {
        epoint_copy(p,pa);
        MR_OUT 
        return MR_ADD;
    }
    if (p->marker==MR_EPOINT_INFINITY) 
    {
        MR_OUT
        return MR_ADD;
    }

    if (!ecurve_padd(_MIPP_ p,pa))
    {    
        ecurve_double(_MIPP_ pa);
        MR_OUT
        return MR_DOUBLE;
    }
    MR_OUT
    if (pa->marker==MR_EPOINT_INFINITY) return MR_OVER;
    return MR_ADD;
}

int ecurve_add(_MIPD_ epoint *p,epoint *pa)
{  /* pa=pa+p; */

#ifdef MR_OS_THREADS
    miracl *mr_mip=get_mip();
#endif
    if (mr_mip->ERNUM) return MR_OVER;

    MR_IN(94)

    if (p==pa) 
    {
        ecurve_double(_MIPP_ pa);
        MR_OUT
        if (pa->marker==MR_EPOINT_INFINITY) return MR_OVER;
        return MR_DOUBLE;
    }
    if (pa->marker==MR_EPOINT_INFINITY)
    {
        epoint_copy(p,pa);
        MR_OUT 
        return MR_ADD;
    }
    if (p->marker==MR_EPOINT_INFINITY) 
    {
        MR_OUT
        return MR_ADD;
    }

    if (!ecurve_padd(_MIPP_ p,pa))
    {    
        ecurve_double(_MIPP_ pa);
        MR_OUT
        return MR_DOUBLE;
    }
    MR_OUT
    if (pa->marker==MR_EPOINT_INFINITY) return MR_OVER;
    return MR_ADD;
}

get_mip

ecurve_double

ecurve_padd