计算SM2 Z及E值

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// unsigned char p[]= { 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
// 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

unsigned char SM2_A[]= { 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC };

unsigned char SM2_B[]= { 0x28, 0xE9, 0xFA, 0x9E, 0x9D, 0x9F, 0x5E, 0x34, 0x4D, 0x5A, 0x9E, 0x4B, 0xCF, 0x65, 0x09, 0xA7,
0xF3, 0x97, 0x89, 0xF5, 0x15, 0xAB, 0x8F, 0x92, 0xDD, 0xBC, 0xBD, 0x41, 0x4D, 0x94, 0x0E, 0x93 };

// unsigned char n[]= { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
// 0x72, 0x03, 0xDF, 0x6B, 0x21, 0xC6, 0x05, 0x2B, 0x53, 0xBB, 0xF4, 0x09, 0x39, 0xD5, 0x41, 0x23 };

unsigned char xG[]={ 0x32, 0xC4, 0xAE, 0x2C, 0x1F, 0x19, 0x81, 0x19, 0x5F, 0x99, 0x04, 0x46, 0x6A, 0x39, 0xC9, 0x94,
0x8F, 0xE3, 0x0B, 0xBF, 0xF2, 0x66, 0x0B, 0xE1, 0x71, 0x5A, 0x45, 0x89, 0x33, 0x4C, 0x74, 0xC7 };

unsigned char yG[]={ 0xBC, 0x37, 0x36, 0xA2, 0xF4, 0xF6, 0x77, 0x9C, 0x59, 0xBD, 0xCE, 0xE3, 0x6B, 0x69, 0x21, 0x53,
0xD0, 0xA9, 0x87, 0x7C, 0xC6, 0x2A, 0x47, 0x40, 0x02, 0xDF, 0x32, 0xE5, 0x21, 0x39, 0xF0, 0xA0};

// 调用者保证pZ缓冲区大于32字节
int SM2_Get_Z(BYTE *pUserID,WORD wUserIDLen,BYTE *px,BYTE*py,BYTE *pZ)
{
if(pUserID == NULL || px == NULL || py == NULL || pZ == NULL)
{
return -1;
}
unsigned char szUIDBitLen[3] = {0}; // 前两个字节为位长度
szUIDBitLen[0] = (BYTE)(wUserIDLen*8 >> 8);
szUIDBitLen[1] = (BYTE)(wUserIDLen*8 & 0x00FF);

sm3_context ctx;
sm3_starts( &ctx );
sm3_update( &ctx, szUIDBitLen, 2 );
sm3_update( &ctx, pUserID, wUserIDLen );

sm3_update( &ctx, SM2_A, 32 );
sm3_update( &ctx, SM2_B, 32 );
sm3_update( &ctx, xG, 32 );
sm3_update( &ctx, yG, 32 );
sm3_update( &ctx, px, 32 );
sm3_update( &ctx, py, 32 );

sm3_finish( &ctx, pZ );
return 0;
}

// 调用者保证pE缓冲区大于32字节
int SM2_Get_E(BYTE *pZ,BYTE *pData,ULONG ulDataLen,BYTE *pE)
{
if(pZ == NULL || pData == NULL || pE == NULL)
{
return -1;
}
sm3_context ctx;
sm3_starts( &ctx );
sm3_update( &ctx, pZ, 32 );
sm3_update( &ctx, pData, ulDataLen );
sm3_finish( &ctx, pE );
return 0;
}

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