69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
#include "ecurve.h"
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// 使用的椭圆曲线(SECP256K1)公开参数
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char Q[] = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F"; // 有限域的模q
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char A[] = "0000000000000000000000000000000000000000000000000000000000000000"; // 曲线方程系数a
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char B[] = "0000000000000000000000000000000000000000000000000000000000000007"; // 曲线方程系数b
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char X[] = "79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798"; // 基点P的x坐标
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char Y[] = "483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"; // 基点P的y坐标
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char P_N[] = "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141"; // 基点P的阶：令nP=O的最小整数
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bool setupEcurve(ECC_PARAMS *params)
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{
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// 初始化变量
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(*params).a = mirvar(0);
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(*params).b = mirvar(0);
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(*params).q = mirvar(0);
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(*params).p = mirvar(0);
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(*params).P_x = mirvar(0);
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(*params).P_y = mirvar(0);
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(*params).P = epoint_init();
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// 赋值
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cinstr((*params).a, A);
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cinstr((*params).b, B);
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cinstr((*params).q, Q);
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cinstr((*params).p, P_N);
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cinstr((*params).P_x, X);
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cinstr((*params).P_y, Y);
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// 椭圆曲线方程初始化
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ecurve_init((*params).a, (*params).b, (*params).q, MR_PROJECTIVE);
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// 设置点坐标(P_x,P_y)为点P，此函数同时能判断P是否在上面初始化成功的椭圆曲线上
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if (!epoint_set((*params).P_x, (*params).P_y, 0, (*params).P))
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{
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freeEcurve(params);
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return false;
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}
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// 判断P是否是阶为p的基点，判断依据：基点乘以阶为无穷远点
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bool bRv = false;
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epoint *P_test = epoint_init();
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ecurve_mult((*params).p, (*params).P, P_test);
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if (point_at_infinity(P_test))
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{
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bRv = true;
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}
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else
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{
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freeEcurve(params);
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bRv = false;
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}
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epoint_free(P_test);
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return bRv;
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}
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void freeEcurve(ECC_PARAMS *params)
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{
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mirkill((*params).a);
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mirkill((*params).b);
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mirkill((*params).q);
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mirkill((*params).p);
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mirkill((*params).P_x);
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mirkill((*params).P_y);
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epoint_free((*params).P);
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} |