/**
* 2.0-style cloaking function
* @param item The item to cloak (part of an IP or hostname)
* @param id A unique ID for this type of item (to make it unique if the item matches)
* @param len The length of the output. Maximum for MD5 is 16 characters.
*/
std::string SegmentCloak(const std::string& item, char id, int len)
{
std::string input;
input.reserve(key.length() + 3 + item.length());
input.append(1, id);
input.append(key);
input.append(1, '\0'); // null does not terminate a C++ string
input.append(item);
std::string rv = Hash->sum(input).substr(0,len);
for(int i=0; i < len; i++)
{
// this discards 3 bits per byte. We have an
// overabundance of bits in the hash output, doesn't
// matter which ones we are discarding.
rv[i] = base32[rv[i] & 0x1F];
}
return rv;
}
