PassphraseGenerator.h

 
#ifndef GPGFRONTEND_PASSPHRASEGENERATOR_H
#define GPGFRONTEND_PASSPHRASEGENERATOR_H
 
#include "core/GpgFrontendCore.h"
#include "core/GpgFunctionObject.h"
 
namespace GpgFrontend {
 
class GPGFRONTEND_CORE_EXPORT PassphraseGenerator
    : public SingletonFunctionObject<PassphraseGenerator> {
 public:
  explicit PassphraseGenerator(
      int channel = SingletonFunctionObject::GetDefaultChannel())
      : SingletonFunctionObject<PassphraseGenerator>(channel) {}
 
  std::string Generate(int len) {
    std::uniform_int_distribution<int> dist(999, 99999);
 
    auto file_string = boost::format("KeyPackage_%1%") % dist(mt_);
    static const char alphanum[] =
        "0123456789"
        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
        "abcdefghijklmnopqrstuvwxyz";
    std::string tmp_str;
    tmp_str.reserve(len);
 
    for (int i = 0; i < len; ++i) {
      tmp_str += alphanum[dist(mt_) % (sizeof(alphanum) - 1)];
    }
    return tmp_str;
  }
 
  std::random_device rd_;                  
  std::mt19937 mt_ = std::mt19937(rd_());  
};
 
}  // namespace GpgFrontend
 
#endif  // GPGFRONTEND_PASSPHRASEGENERATOR_H