我也发个第2阶段第2题答案
void GetHash(const char* pszUserName, BYTE* pHash)
{
Integer a(-3);
Integer modulus("C564EEF070E69193h");
Integer b("22996B9C33AEEFDBH");
ECP ecp(modulus, a,b);
Integer var_378("1C4EEE9222DDDA62h");
Integer var_328("2223A1D595845FA2h");
ECP::Point base(var_328, var_378);
Integer var_364("880198E3724F9FEEh");
Integer var_350("297A4A1E5B1FC99Bh");
ECP::Point y(var_350, var_364); //pub-key
Integer var_33C("C564EEF19A080B07h"); //n
Integer d("54656E63656E7420H"); //ecc 密码是 "Tencent "
ECDSA<ECP, SHA>::Signer priv(ecp, base, var_33C, d);
AutoSeededRandomPool rng;
priv.SignMessage(rng, (BYTE*)pszUserName, strlen(pszUserName), pHash);
}
void Base32Convert(BYTE* pHash, BYTE* pData)
{
int i;
int j;
BYTE bits[20*8];
for(i=0; i<20; i++)
{
for(j=0; j<8; j++)
{
bits[i*8+7-j] = (pHash[i]>>j)&1;
}
}
for(i=0; i<32; i++)
{
for(j=0; j<5; j++)
{
pData[i] |= bits[i*5+j] << (4-j);
}
}
}
void DataToCode(BYTE* pData, char* pszCode)
{
char* pstr = "ABCDEFGHJKMNPQRSTVWXYZ1234567890";
int i;
for(i=0; i<32; i++)
{
pszCode[i] = pstr[pData[i]];
}
}
void Keygen(const char* pszUserName, char* pszLicenseCode)
{
BYTE cbHash[32];
BYTE cbData[32];
memset(cbHash, 0, sizeof(cbHash));
memset(cbData, 0, sizeof(cbData));
//ecdsa
GetHash(pszUserName, cbHash);
//blowfish
UINT* ptmp = (UINT*)cbHash;
*(UINT*)(cbData+0x10) = ptmp[0] ^ ptmp[1] ^ ptmp[2] ^ ptmp[3];
ptmp[0] ^= *(UINT*)(cbData+0x10);
BF_KEY key;
My_BF_set_key(&key, 8,(BYTE*)"DEADBEEF");
My_BF_decrypt(ptmp, &key);
ptmp[2] ^= ptmp[0];
ptmp[3] ^= ptmp[1];
My_BF_decrypt(ptmp+2, &key);
//置换
int i;
for(i=0; i<16; i++)
{
cbHash[i] = gtable[cbHash[i]];
}
for(i=0; i<4; i++)
{
cbData[0x10+i] = gtable[cbData[0x10+i]];
}
//SMS4
INT32U rk[32];
SMS4_KeyExpansion ((ULONG*)"Security@Tencent", rk);
SMS4_Encryption((ULONG*)cbHash, rk, (ULONG*)cbData);
//base32
BYTE sndata[32] = {0};
Base32Convert(cbData, sndata);
char szCode[64] = {0};
DataToCode(sndata, szCode);
pszLicenseCode[8] = pszLicenseCode[0x11] = pszLicenseCode[0x1a] = '-';
memcpy(pszLicenseCode, szCode, 8);
memcpy(pszLicenseCode+9, szCode+8, 8);
memcpy(pszLicenseCode+0x12, szCode+16, 8);
memcpy(pszLicenseCode+0x1b, szCode+24, 8);
}
