src/purple/purple-crypt.c

   1 /**
   2  * @file purple-crypt.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2010 SIPE Project <http://sipe.sourceforge.net/>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "glib.h"
  24 #include "cipher.h"
  25
  26 #include "sipe-crypt.h"
  27
  28 void sipe_crypt_des(const guchar *key,
  29                     const guchar *plaintext, gsize plaintext_length,
  30                     guchar *encrypted_text)
  31 {
  32         gsize dummy;
  33         PurpleCipherContext *context = purple_cipher_context_new_by_name("des", NULL);
  34         purple_cipher_context_set_key(context, key);
  35         purple_cipher_context_encrypt(context, plaintext, plaintext_length, encrypted_text, &dummy);
  36         purple_cipher_context_destroy(context);
  37 }
  38
  39 void sipe_crypt_rc4(const guchar *key, gsize key_length,
  40                     const guchar *plaintext, gsize plaintext_length,
  41                     guchar *encrypted_text)
  42 {
  43         gsize dummy;
  44         PurpleCipherContext *context = purple_cipher_context_new_by_name("rc4", NULL);
  45         purple_cipher_context_set_option(context, "key_len", (gpointer)key_length);
  46         purple_cipher_context_set_key(context, key);
  47         purple_cipher_context_encrypt(context, plaintext, plaintext_length, encrypted_text, &dummy);
  48         purple_cipher_context_destroy(context);
  49 }
  50
  51 /* Stream RC4 cipher for file transfer */
  52 gpointer sipe_crypt_ft_start(const guchar *key)
  53 {
  54         PurpleCipherContext *context = purple_cipher_context_new_by_name("rc4", NULL);
  55         /* only use first 16 characters of the key */
  56         purple_cipher_context_set_option(context, "key_len", (gpointer)16);
  57         purple_cipher_context_set_key(context, key);
  58         return(context);
  59 }
  60
  61 void sipe_crypt_ft_stream(gpointer context,
  62                           const guchar *in, gsize length,
  63                           guchar *out)
  64 {
  65         purple_cipher_context_encrypt(context, in, length, out, NULL);
  66 }
  67
  68 void sipe_crypt_ft_destroy(gpointer context)
  69 {
  70         purple_cipher_context_destroy(context);
  71 }
  72
  73 /*
  74   Local Variables:
  75   mode: c
  76   c-file-style: "bsd"
  77   indent-tabs-mode: t
  78   tab-width: 8
  79   End:
  80 */