src/core/sipe-crypt.c

   1  /**
   2  * @file sipe-crypt.c
   3  *
   4  * pidgin-sipe
   5  *
   6  * Copyright (C) 2010 pier11 <pier11@operamail.com>
   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 /**
  24  * Cypher routines implementation based on NSS.
  25  * Includes: RC4, DES
  26  */
  27
  28 #include "glib.h"
  29
  30 #include "nss.h"
  31 #include "pk11pub.h"
  32
  33 #include "sipe-crypt.h"
  34
  35
  36 /* PRIVATE methons */
  37
  38 static PK11Context*
  39 sipe_crypt_ctx_create(CK_MECHANISM_TYPE cipherMech, const guchar *key, gsize key_length)
  40 {
  41         PK11SlotInfo* slot;
  42         SECItem keyItem;
  43         SECItem ivItem;
  44         PK11SymKey* SymKey;
  45         SECItem *SecParam;
  46         PK11Context* EncContext;
  47
  48         /* For key */
  49         slot = PK11_GetBestSlot(cipherMech, NULL);
  50
  51         keyItem.type = siBuffer;
  52         keyItem.data = (unsigned char *)key;
  53         keyItem.len = key_length;
  54
  55         SymKey = PK11_ImportSymKey(slot, cipherMech, PK11_OriginUnwrap, CKA_ENCRYPT, &keyItem, NULL);
  56
  57         /* Parameter for crypto context */
  58         ivItem.type = siBuffer;
  59         ivItem.data = NULL;
  60         ivItem.len = 0;
  61         SecParam = PK11_ParamFromIV(cipherMech, &ivItem);
  62
  63         EncContext = PK11_CreateContextBySymKey(cipherMech, CKA_ENCRYPT, SymKey, SecParam);
  64
  65         PK11_FreeSymKey(SymKey);
  66         SECITEM_FreeItem(SecParam, PR_TRUE);
  67         PK11_FreeSlot(slot);
  68
  69         return EncContext;
  70 }
  71
  72 static void
  73 sipe_crypt_ctx_encrypt(PK11Context* EncContext, const guchar *in, gsize length, guchar *out)
  74 {
  75         int tmp1_outlen;
  76
  77         PK11_CipherOp(EncContext, out, &tmp1_outlen, length, (unsigned char *)in, length);
  78 }
  79
  80 static void
  81 sipe_crypt_ctx_destroy(PK11Context* EncContext)
  82 {
  83         PK11_DestroyContext(EncContext, PR_TRUE);
  84 }
  85
  86 static void
  87 sipe_crypt(CK_MECHANISM_TYPE cipherMech,
  88            const guchar *key, gsize key_length,
  89            const guchar *plaintext, gsize plaintext_length,
  90            guchar *encrypted_text)
  91 {
  92         void *EncContext;
  93
  94         EncContext = sipe_crypt_ctx_create(cipherMech, key, key_length);
  95         sipe_crypt_ctx_encrypt(EncContext, plaintext, plaintext_length, encrypted_text);
  96         sipe_crypt_ctx_destroy(EncContext);
  97 }
  98
  99
 100 /* PUBLIC methons */
 101
 102 void
 103 sipe_crypt_des(const guchar *key,
 104                const guchar *plaintext, gsize plaintext_length,
 105                guchar *encrypted_text)
 106 {
 107         sipe_crypt(CKM_DES_ECB, key, 8, plaintext, plaintext_length, encrypted_text);
 108 }
 109
 110 void
 111 sipe_crypt_rc4(const guchar *key, gsize key_length,
 112                const guchar *plaintext, gsize plaintext_length,
 113                guchar *encrypted_text)
 114 {
 115         sipe_crypt(CKM_RC4, key, key_length, plaintext, plaintext_length, encrypted_text);
 116 }
 117
 118 /* Stream RC4 cipher for file transfer */
 119 gpointer
 120 sipe_crypt_ft_start(const guchar *key)
 121 {
 122         return sipe_crypt_ctx_create(CKM_RC4, key, 16);
 123 }
 124
 125 void
 126 sipe_crypt_ft_stream(gpointer context,
 127                      const guchar *in, gsize length,
 128                      guchar *out)
 129 {
 130         sipe_crypt_ctx_encrypt(context, in, length, out);
 131 }
 132
 133 void
 134 sipe_crypt_ft_destroy(gpointer context)
 135 {
 136         sipe_crypt_ctx_destroy(context);
 137 }
 138
 139 /*
 140   Local Variables:
 141   mode: c
 142   c-file-style: "bsd"
 143   indent-tabs-mode: t
 144   tab-width: 8
 145   End:
 146 */