octopi/library/tentacles/encryption_infoton.cpp

   1 /*****************************************************************************\
   2 *                                                                             *
   3 *  Name   : encryption_infoton                                                *
   4 *  Author : Chris Koeritz                                                     *
   5 *                                                                             *
   6 *******************************************************************************
   7 * Copyright (c) 2004-$now By Author.  This program is free software; you can  *
   8 * redistribute it and/or modify it under the terms of the GNU General Public  *
   9 * License as published by the Free Software Foundation; either version 2 of   *
  10 * the License or (at your option) any later version.  This is online at:      *
  11 *     http://www.fsf.org/copyleft/gpl.html                                    *
  12 * Please send any updates to: fred@gruntose.com                               *
  13 \*****************************************************************************/
  14
  15 #include "encryption_infoton.h"
  16
  17 #include <basis/byte_array.h>
  18
  19 #include <basis/mutex.h>
  20 #include <basis/functions.h>
  21 #include <crypto/blowfish_crypto.h>
  22 #include <crypto/rsa_crypto.h>
  23 #include <octopus/tentacle.h>
  24 #include <structures/static_memory_gremlin.h>
  25 #include <textual/byte_formatter.h>
  26
  27 using namespace basis;
  28 using namespace crypto;
  29 using namespace octopi;
  30 using namespace structures;
  31 using namespace textual;
  32
  33 namespace octopi {
  34
  35 const int encryption_infoton::BLOWFISH_KEY_SIZE = 314;
  36   // our key size is almost double the recommended key size (168 bits).
  37   // this would take a very long time to crack using brute force.
  38
  39 const int encryption_infoton::RSA_KEY_SIZE = 1480;
  40   // a little bit larger than the 1024 bit threshold.
  41
  42 #undef LOG
  43 #define LOG(s) CLASS_EMERGENCY_LOG(program_wide_logger::get(), s);
  44
  45 encryption_infoton::encryption_infoton(const byte_array &pub_key,
  46     const byte_array &secret_blowfish)
  47 : infoton(encryption_classifier()),
  48   _public_key(pub_key),
  49   _encrypted_blowfish_key(secret_blowfish),
  50   _success(tentacle::NOT_FOUND)
  51 {}
  52
  53 encryption_infoton::encryption_infoton(const encryption_infoton &to_copy)
  54 : root_object(),
  55   infoton(to_copy),
  56   _public_key(to_copy._public_key),
  57   _encrypted_blowfish_key(to_copy._encrypted_blowfish_key),
  58   _success(to_copy._success)
  59 {
  60 }
  61
  62 encryption_infoton::~encryption_infoton() {}
  63
  64 clonable *encryption_infoton::clone() const
  65 { return cloner<encryption_infoton>(*this); }
  66
  67 encryption_infoton &encryption_infoton::operator =
  68     (const encryption_infoton &to_copy)
  69 {
  70   if (this == &to_copy) return *this;
  71   _public_key = to_copy._public_key;
  72   _encrypted_blowfish_key = to_copy._encrypted_blowfish_key;
  73   _success = to_copy._success;
  74   return *this;
  75 }
  76
  77 const char *encryption_class_constant = "#octcod";
  78
  79 SAFE_STATIC_CONST(string_array, encryption_infoton::encryption_classifier,
  80     (1, &encryption_class_constant))
  81
  82 int encryption_infoton::packed_size() const
  83 {
  84   return sizeof(int)  // packed outcome.
  85       + _public_key.length() + sizeof(int)  // public key array.
  86       + _encrypted_blowfish_key.length() + sizeof(int);  // secret key array.
  87 }
  88
  89 void encryption_infoton::pack(byte_array &packed_form) const
  90 {
  91   structures::attach(packed_form, _success.value());
  92   structures::attach(packed_form, _public_key);
  93   structures::attach(packed_form, _encrypted_blowfish_key);
  94 }
  95
  96 bool encryption_infoton::unpack(byte_array &packed_form)
  97 {
  98   int value;
  99   if (!structures::detach(packed_form, value)) return false;
 100   _success = outcome(value);
 101   if (!structures::detach(packed_form, _public_key)) return false;
 102   if (!structures::detach(packed_form, _encrypted_blowfish_key)) return false;
 103   return true;
 104 }
 105
 106 outcome encryption_infoton::prepare_blowfish_key(blowfish_crypto &new_key)
 107 {
 108   FUNCDEF("prepare_blowfish_key");
 109   _encrypted_blowfish_key.reset();  // clean out stuff to create.
 110   if (!_public_key.length()) {
 111     // wrong type of request being seen or something.
 112     _success = tentacle::BAD_INPUT;
 113     return _success;
 114   }
 115
 116   rsa_crypto pub(_public_key);  // suck in the provided key.
 117   blowfish_crypto agreed_key(BLOWFISH_KEY_SIZE);  // random blowfish key.
 118   new_key = agreed_key;
 119
 120   // now encrypt the new key for transit.
 121   bool worked = pub.public_encrypt(agreed_key.get_key(),
 122       _encrypted_blowfish_key);
 123   if (!worked) _success = tentacle::GARBAGE;  // lacking a better description.
 124   else _success = tentacle::OKAY;
 125   return _success;
 126 }
 127
 128 outcome encryption_infoton::prepare_both_keys(rsa_crypto &private_key)
 129 {
 130   rsa_crypto priv(RSA_KEY_SIZE);  // generate random key.
 131   outcome to_return = prepare_public_key(priv);
 132   if (to_return == tentacle::OKAY) private_key = priv;
 133   return to_return;
 134 }
 135
 136 outcome encryption_infoton::prepare_public_key(const rsa_crypto &private_key)
 137 {
 138   bool worked = private_key.public_key(_public_key);
 139   if (!worked) return tentacle::DISALLOWED;  // why would that ever fail?
 140   return tentacle::OKAY;
 141 }
 142
 143 outcome encryption_infoton::extract_response(const rsa_crypto &private_key,
 144     blowfish_crypto &new_key) const
 145 {
 146   FUNCDEF("extract_response");
 147   if (_success != tentacle::OKAY) return _success;
 148   byte_array decrypted;
 149   bool worked = private_key.private_decrypt(_encrypted_blowfish_key, decrypted);
 150   if (!worked) return tentacle::BAD_INPUT;  // that one we hope is accurate.
 151   new_key.set_key(decrypted, BLOWFISH_KEY_SIZE);
 152   return tentacle::OKAY;
 153 }
 154
 155 } //namespace.
 156