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/*
* SCAN Name Abstraction
* (C) 2008,2015 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SCAN_NAME_H__
#define BOTAN_SCAN_NAME_H__
#include <botan/exceptn.h>
#include <string>
#include <vector>
#include <map>
namespace Botan {
/**
A class encapsulating a SCAN name (similar to JCE conventions)
http://www.users.zetnet.co.uk/hopwood/crypto/scan/
*/
class BOTAN_DLL SCAN_Name
{
public:
/**
* Create a SCAN_Name
* @param algo_spec A SCAN-format name
*/
explicit SCAN_Name(const char* algo_spec);
/**
* Create a SCAN_Name
* @param algo_spec A SCAN-format name
*/
explicit SCAN_Name(std::string algo_spec);
/**
* @return original input string
*/
const std::string& as_string() const { return m_orig_algo_spec; }
/**
* @return algorithm name
*/
const std::string& algo_name() const { return m_alg_name; }
/**
* @return number of arguments
*/
size_t arg_count() const { return m_args.size(); }
/**
* @param lower is the lower bound
* @param upper is the upper bound
* @return if the number of arguments is between lower and upper
*/
bool arg_count_between(size_t lower, size_t upper) const
{ return ((arg_count() >= lower) && (arg_count() <= upper)); }
/**
* @param i which argument
* @return ith argument
*/
std::string arg(size_t i) const;
/**
* @param i which argument
* @param def_value the default value
* @return ith argument or the default value
*/
std::string arg(size_t i, const std::string& def_value) const;
/**
* @param i which argument
* @param def_value the default value
* @return ith argument as an integer, or the default value
*/
size_t arg_as_integer(size_t i, size_t def_value) const;
/**
* @return cipher mode (if any)
*/
std::string cipher_mode() const
{ return (m_mode_info.size() >= 1) ? m_mode_info[0] : ""; }
/**
* @return cipher mode padding (if any)
*/
std::string cipher_mode_pad() const
{ return (m_mode_info.size() >= 2) ? m_mode_info[1] : ""; }
private:
std::string m_orig_algo_spec;
std::string m_alg_name;
std::vector<std::string> m_args;
std::vector<std::string> m_mode_info;
};
// This is unrelated but it is convenient to stash it here
template<typename T>
std::vector<std::string> probe_providers_of(const std::string& algo_spec,
const std::vector<std::string>& possible)
{
std::vector<std::string> providers;
for(auto&& prov : possible)
{
std::unique_ptr<T> o(T::create(algo_spec, prov));
if(o)
{
providers.push_back(prov); // available
}
}
return providers;
}
}
#endif
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