[应用相关] 基于 STM32 加密库开发比特币应用的补充 说明

/* coefficient a*/

const uint8_t secp256_a[] =

{

 0x00

};

/* coefficient b */

const uint8_t secp256_b[] =

{

 0x7

};

/* prime modulus p*/

const uint8_t secp256_p[] =

{

 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,

 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xff,

 0xff,0xfc,0x2f

};

/* order n*/

const uint8_t secp256_n[] = {

 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,

 0xff,0xfe,0xba,0xae,0xdc,0xe6,0xaf,0x48,0xa0,0x3b,0xbf,0xd2,0x5e,0x8c,0xd0,

 0x36,0x41,0x41

 

};

/* base point Gx*/

const uint8_t secp256_Gx[] =

{

 0x79,0xbe,0x66,0x7e,0xf9,0xdc,0xbb,0xac,0x55,0xa0,0x62,0x95,0xce,0x87,

 0x0b,0x07,0x02,0x9b,0xfc,0xdb,0x2d,0xce,0x28,0xd9,0x59,0xf2,0x81,0x5b,0x16,

 0xf8,0x17,0x98

 

};

/* base point Gy*/

const uint8_t secp256_Gy[] =

{

 0x48,0x3a,0xda,0x77,0x26,0xa3,0xc4,0x65,0x5d,0xa4,0xfb,0xfc,

 0x0e,0x11,0x08,0xa8,0xfd,0x17,0xb4,0x48,0xa6,0x85,0x54,0x19,0x9c,0x47,0xd0,

 0x8f,0xfb,0x10,0xd4,0xb8

};

case 3: 

 /* Initialize the ECC curve structure, with all the parameters */

 EC_st.pmA = secp256_a;

 EC_st.pmP = secp256_p;

 EC_st.pmN = secp256_n;

 EC_st.pmGx = secp256_Gx;

 EC_st.pmGy = secp256_Gy;

 EC_st.mAsize = sizeof(secp256_a);

 EC_st.mNsize = sizeof(secp256_n);

 EC_st.mPsize = sizeof(secp256_p);

 EC_st.mGxsize = sizeof(secp256_Gx);

 EC_st.mGysize = sizeof(secp256_Gy);

 break;

ECCkeyGen(PrivKey, PubKey, &RNGstate, &EC_st, &Crypto_Buffer); // 例程原有代码

// 使用这里产生的私钥，通过点乘运算得到公钥，看是否和该 API 生成的公钥一致

// 调用 ECCinitPoint 为参考点分配空间

ECCinitPoint(&G, &EC_st, &Crypto_Buffer);

// 从参数曲线中获取该曲线的参考点

ECCsetPointGenerator(G, &EC_st);

// 对私钥做一个基于曲线参考点的点乘，结果就是该私钥对应的公钥

ECCscalarMul(G, PrivKey, PubKey, &EC_st, &Crypto_Buffer);

ECCpoint_stt *G = NULL;

ECCfreePoint(&G, &Crypto_Buffer);

ECCsetPrivKeyValue(PrivKey, secp256_priv, sizeof(secp256_priv));