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/*
* SRP-6a File Handling
* (C) 2011 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/srp6_files.h>
#include <botan/parsing.h>
#include <botan/base64.h>
#include <fstream>
namespace Botan {
SRP6_Authenticator_File::SRP6_Authenticator_File(const std::string& filename)
{
std::ifstream in(filename.c_str());
if(!in)
return; // no entries
while(in.good())
{
std::string line;
std::getline(in, line);
std::vector<std::string> parts = split_on(line, ':');
if(parts.size() != 4)
throw Decoding_Error("Invalid line in SRP authenticator file");
std::string username = parts[0];
BigInt v = BigInt::decode(base64_decode(parts[1]));
MemoryVector<byte> salt = base64_decode(parts[2]);
BigInt group_id_idx = BigInt::decode(base64_decode(parts[3]));
std::string group_id;
if(group_id_idx == 1)
group_id = "modp/srp/1024";
else if(group_id_idx == 2)
group_id = "modp/srp/1536";
else if(group_id_idx == 3)
group_id = "modp/srp/2048";
else
continue; // unknown group, ignored
entries[username] = SRP6_Data(v, salt, group_id);
}
}
bool SRP6_Authenticator_File::lookup_user(const std::string& username,
BigInt& v,
MemoryRegion<byte>& salt,
std::string& group_id) const
{
std::map<std::string, SRP6_Data>::const_iterator i = entries.find(username);
if(i == entries.end())
return false;
v = i->second.v;
salt = i->second.salt;
group_id = i->second.group_id;
return true;
}
}
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