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/*
* SCAN Name Abstraction
* (C) 2008-2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/scan_name.h>
#include <botan/parsing.h>
#include <botan/exceptn.h>
#include <stdexcept>
namespace Botan {
namespace {
std::string make_arg(
const std::vector<std::pair<size_t, std::string> >& name, size_t start)
{
std::string output = name[start].second;
size_t level = name[start].first;
size_t paren_depth = 0;
for(size_t i = start + 1; i != name.size(); ++i)
{
if(name[i].first <= name[start].first)
break;
if(name[i].first > level)
{
output += '(' + name[i].second;
++paren_depth;
}
else if(name[i].first < level)
{
output += ")," + name[i].second;
--paren_depth;
}
else
{
if(output[output.size() - 1] != '(')
output += ",";
output += name[i].second;
}
level = name[i].first;
}
for(size_t i = 0; i != paren_depth; ++i)
output += ')';
return output;
}
std::pair<size_t, std::string>
deref_aliases(const std::pair<size_t, std::string>& in)
{
return std::make_pair(in.first,
SCAN_Name::deref_alias(in.second));
}
}
std::mutex SCAN_Name::s_alias_map_mutex;
std::map<std::string, std::string> SCAN_Name::s_alias_map;
SCAN_Name::SCAN_Name(std::string algo_spec)
{
orig_algo_spec = algo_spec;
std::vector<std::pair<size_t, std::string> > name;
size_t level = 0;
std::pair<size_t, std::string> accum = std::make_pair(level, "");
std::string decoding_error = "Bad SCAN name '" + algo_spec + "': ";
algo_spec = SCAN_Name::deref_alias(algo_spec);
for(size_t i = 0; i != algo_spec.size(); ++i)
{
char c = algo_spec[i];
if(c == '/' || c == ',' || c == '(' || c == ')')
{
if(c == '(')
++level;
else if(c == ')')
{
if(level == 0)
throw Decoding_Error(decoding_error + "Mismatched parens");
--level;
}
if(c == '/' && level > 0)
accum.second.push_back(c);
else
{
if(accum.second != "")
name.push_back(deref_aliases(accum));
accum = std::make_pair(level, "");
}
}
else
accum.second.push_back(c);
}
if(accum.second != "")
name.push_back(deref_aliases(accum));
if(level != 0)
throw Decoding_Error(decoding_error + "Missing close paren");
if(name.size() == 0)
throw Decoding_Error(decoding_error + "Empty name");
alg_name = name[0].second;
bool in_modes = false;
for(size_t i = 1; i != name.size(); ++i)
{
if(name[i].first == 0)
{
mode_info.push_back(make_arg(name, i));
in_modes = true;
}
else if(name[i].first == 1 && !in_modes)
args.push_back(make_arg(name, i));
}
}
std::string SCAN_Name::algo_name_and_args() const
{
std::string out;
out = algo_name();
if(arg_count())
{
out += '(';
for(size_t i = 0; i != arg_count(); ++i)
{
out += arg(i);
if(i != arg_count() - 1)
out += ',';
}
out += ')';
}
return out;
}
std::string SCAN_Name::arg(size_t i) const
{
if(i >= arg_count())
throw std::range_error("SCAN_Name::argument - i out of range");
return args[i];
}
std::string SCAN_Name::arg(size_t i, const std::string& def_value) const
{
if(i >= arg_count())
return def_value;
return args[i];
}
size_t SCAN_Name::arg_as_integer(size_t i, size_t def_value) const
{
if(i >= arg_count())
return def_value;
return to_u32bit(args[i]);
}
void SCAN_Name::add_alias(const std::string& alias, const std::string& basename)
{
std::lock_guard<std::mutex> lock(s_alias_map_mutex);
if(s_alias_map.find(alias) == s_alias_map.end())
s_alias_map[alias] = basename;
}
std::string SCAN_Name::deref_alias(const std::string& alias)
{
std::lock_guard<std::mutex> lock(s_alias_map_mutex);
std::string name = alias;
for(auto i = s_alias_map.find(name); i != s_alias_map.end(); i = s_alias_map.find(name))
name = i->second;
return name;
}
void SCAN_Name::set_default_aliases()
{
// common variations worth supporting
SCAN_Name::add_alias("EME-PKCS1-v1_5", "PKCS1v15");
SCAN_Name::add_alias("3DES", "TripleDES");
SCAN_Name::add_alias("DES-EDE", "TripleDES");
SCAN_Name::add_alias("CAST5", "CAST-128");
SCAN_Name::add_alias("SHA1", "SHA-160");
SCAN_Name::add_alias("SHA-1", "SHA-160");
SCAN_Name::add_alias("MARK-4", "RC4(256)");
SCAN_Name::add_alias("ARC4", "RC4");
SCAN_Name::add_alias("OMAC", "CMAC");
SCAN_Name::add_alias("EMSA-PSS", "PSSR");
SCAN_Name::add_alias("PSS-MGF1", "PSSR");
SCAN_Name::add_alias("EME-OAEP", "OAEP");
SCAN_Name::add_alias("EMSA2", "EMSA_X931");
SCAN_Name::add_alias("EMSA3", "EMSA_PKCS1");
SCAN_Name::add_alias("EMSA-PKCS1-v1_5", "EMSA_PKCS1");
// should be renamed in sources
SCAN_Name::add_alias("X9.31", "EMSA2");
// kept for compatability with old library versions
SCAN_Name::add_alias("EMSA4", "PSSR");
SCAN_Name::add_alias("EME1", "OAEP");
// probably can be removed
SCAN_Name::add_alias("GOST", "GOST-28147-89");
SCAN_Name::add_alias("GOST-34.11", "GOST-R-34.11-94");
}
}
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