lib/opencdk/seskey.c

   1 /* seskey.c - Session key routines
   2  * Copyright (C) 1998-2012 Free Software Foundation, Inc.
   3  *
   4  * Author: Timo Schulz
   5  *
   6  * This file is part of OpenCDK.
   7  *
   8  * The OpenCDK library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 3 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  20  *
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26 #include <stdio.h>
  27
  28 #include "opencdk.h"
  29 #include "main.h"
  30 #include "packet.h"
  31
  32 /**
  33  * cdk_s2k_new:
  34  * @ret_s2k: output for the new S2K object
  35  * @mode: the S2K mode (simple, salted, iter+salted)
  36  * @digest_algo: the hash algorithm
  37  * @salt: random salt
  38  *
  39  * Create a new S2K object with the given parameter.
  40  * The @salt parameter must be always 8 octets.
  41  **/
  42 cdk_error_t
  43 cdk_s2k_new (cdk_s2k_t * ret_s2k, int mode, int digest_algo,
  44              const byte * salt)
  45 {
  46   cdk_s2k_t s2k;
  47
  48   if (!ret_s2k)
  49     return CDK_Inv_Value;
  50
  51   if (mode != 0x00 && mode != 0x01 && mode != 0x03)
  52     return CDK_Inv_Mode;
  53
  54   if (_gnutls_hash_get_algo_len (digest_algo) <= 0)
  55     return CDK_Inv_Algo;
  56
  57   s2k = cdk_calloc (1, sizeof *s2k);
  58   if (!s2k)
  59     return CDK_Out_Of_Core;
  60   s2k->mode = mode;
  61   s2k->hash_algo = digest_algo;
  62   if (salt)
  63     memcpy (s2k->salt, salt, 8);
  64   *ret_s2k = s2k;
  65   return 0;
  66 }
  67
  68
  69 /**
  70  * cdk_s2k_free:
  71  * @s2k: the S2K object
  72  *
  73  * Release the given S2K object.
  74  **/
  75 void
  76 cdk_s2k_free (cdk_s2k_t s2k)
  77 {
  78   cdk_free (s2k);
  79 }
  80
  81
  82 /* Make a copy of the source s2k into R_DST. */
  83 cdk_error_t
  84 _cdk_s2k_copy (cdk_s2k_t * r_dst, cdk_s2k_t src)
  85 {
  86   cdk_s2k_t dst;
  87   cdk_error_t err;
  88
  89   err = cdk_s2k_new (&dst, src->mode, src->hash_algo, src->salt);
  90   if (err)
  91     return err;
  92   dst->count = src->count;
  93   *r_dst = dst;
  94
  95   return 0;
  96 }