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;
}
int DecodeShortV3(const char* serial, bool level10, unsigned char* dest, int dest_len)
{
char keybytes_[512];
char* kb=keybytes_;
char* keybytes=keybytes_;
char* k1;
char* k2;
bool keystring=false;
int keylength;
const char* udigits="0123456789ABCDEFGHJKMNPQRTUVWXYZ";
const char* ldigits="0123456789abcdefghjkmnpqrtuvwxyz";
const char* c=serial;
const char* p;
unsigned char value=0;
unsigned char firstdigit=1;
BigInt n, n2, n3;
n=BigInt_Create();
n2=BigInt_Create();
n3=BigInt_Create();
int level=0;
if(level10)
level=10;
if(serial==0 || serial[0]==0)
{
return 0;
}
while(c[0])
{
p=strchr(udigits, c[0]); //first the current serial character in udigits
if(p)
{
value=p-udigits;
}
else
{
p=strchr(ldigits, c[0]); //first the current character in ldigits
if(p)
{
value=p-ldigits;
}
else if(c[0]=='i' || c[0]=='I' || c[0]=='l' || c[0]=='L')
{
value=1;
}
else if(c[0]=='o' || c[0]=='O')
{
value=0;
}
else if(c[0]=='s' || c[0]=='S')
{
value=5;
}
else
{
value=32;
}
}
c++;
if(value<32) //must be base32
{
if(firstdigit) //ignore the first key character
{
if(level==10)
{
/* All level 10 keys start with the digit 1. It
doesn't convey any information other than the fact
that they're level 10 keys; discard it. */
//KeyString starts with 3
if(value==3)
{
value=0;
keystring=true; //TODO: remove?
}
if(value!=0)
{
value=0;
firstdigit=0;
}
}
else
{
//KeyString starts with 3
if(value==3)
{
value=0;
keystring=true; //TODO: remove?
}
if(value!=0 && value>=16)
{
value-=16;
firstdigit=0;
}
}
}
BigInt_Shift(n, 5, n2);
BigInt_SetU(n3, value);
BigInt_Add(n2, n3, n);
}
} //end of loop
//Spit out the bytes, in reverse order.
BigInt_Set(n3, 0xFF);
if(level==10)
{
while(BigInt_Compare(n, BigInt_One())>0)
{
BigInt_And(n, n3, n2);
kb[0]=(unsigned char)BigInt_GetU(n2);
kb++;
BigInt_Shift(n, -8, n2);
BigInt_Copy(n, n2);
}
}
else
{
while(BigInt_Compare(n, BigInt_Zero())!=0)
{
BigInt_And(n, n3, n2);
kb[0]=(unsigned char)BigInt_GetU(n2);
kb++;
BigInt_Shift(n, -8, n2);
BigInt_Copy(n, n2);
}
}
if((kb-keybytes)%2) //if the length / 2 has a remainder
{
kb[0]=0; //discard last byte?
kb++;
}
/* Reverse digits in keybytes */
k1=keybytes;
k2=kb-1;
while(k1<k2)
{
char t=k1[0];
k1[0]=k2[0];
k2[0]=t;
k2--;
k1++;
}
BigInt_Destroy(n3);
BigInt_Destroy(n2);
BigInt_Destroy(n);
keylength=kb-keybytes;
memset(dest, 0, dest_len);
memcpy(dest, keybytes, keylength);
return keylength;
}
