bool KG_GeneratePvtY(int level, char* keytemplate, char* pvt_text, char* y_text)
{
char tmp[256] = "";
BigInt p, p1, pub, pvt, y, temp, temp2;
int size, keysystem;
if(level == 29)
{
char basepoint_text[10] = "", public_x_text[100] = "", public_y_text[100] = "";
KG_GenerateEcdsaParameters(keytemplate, pvt_text, basepoint_text, public_x_text, public_y_text);
sprintf(y_text, "%s,%s,%s", basepoint_text, public_x_text, public_y_text);
return true;
}
else if(level >= 20)
{
keysystem = KS_SHORTV3;
level = level - 20;
if(level > 8)
return false;
}
else if(level >= 10)
{
keysystem = KS_V3;
level = level - 10;
if(level > 8)
return false;
}
else
{
keysystem = KS_V2;
if(level<0 or level>3)
return false;
}
size = level + 4;
p = BigInt_Create();
p1 = BigInt_Create();
pub = BigInt_Create();
pvt = BigInt_Create();
y = BigInt_Create();
temp = BigInt_Create();
temp2 = BigInt_Create();
BigInt_Set(temp, 1);
BigInt_Shift(temp, size * 8, p);
BigInt_Set(temp, primeoffsets[level]);
BigInt_Add(p, temp, temp2);
BigInt_Copy(p, temp2);
BigInt_Subtract(p, BigInt_One(), p1);
sprintf(tmp, "%u Level Public Key", level);
GenerateKeyNumberFromString(tmp, p, &pub, keysystem, ((keysystem == KS_V3 || keysystem == KS_SHORTV3) ? level + 1 : 0));
GenerateKeyNumberFromString(keytemplate, p, &pvt, keysystem, ((keysystem == KS_V3 || keysystem == KS_SHORTV3) ? level + 1 : 0));
BigInt_ToString(pvt, 16, pvt_text);
BigInt_PowerModulus(pub, pvt, p, y);
BigInt_ToString(y, 16, y_text);
BigInt_Destroy(temp2);
BigInt_Destroy(temp);
BigInt_Destroy(y);
BigInt_Destroy(pvt);
BigInt_Destroy(pub);
BigInt_Destroy(p1);
BigInt_Destroy(p);
return true;
}
void BigInt_Power(BigInt n, BigInt exp, BigInt answer)
{
BigInt_PowerModulus(n, exp, 0, answer);
}
