signed long BigInt_Get(BigInt n)
{
signed long value=BigInt_GetU(n);
if(value<0) value=-value;
if(n->negative) value=-value;
return value;
}
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;
}
