engines/ccgost/gost_ctl.c

   1 /**********************************************************************
   2  *                        gost_ctl.c                                  *
   3  *             Copyright (c) 2005-2006 Cryptocom LTD                  *
   4  *       This file is distributed under the same license as OpenSSL   *
   5  *                                                                    *
   6  *        Implementation of control commands for GOST engine          *
   7  *            OpenSSL 0.9.9 libraries required                        *
   8  **********************************************************************/
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <openssl/engine.h>
  12 #include "gost_lcl.h"
  13
  14 static char *gost_params[GOST_PARAM_MAX+1]={NULL};
  15 static const char *gost_envnames[]={"CRYPT_PARAMS"};
  16 const ENGINE_CMD_DEFN gost_cmds[]=
  17         {
  18 /*      { GOST_CTRL_RNG,
  19         "RNG",
  20         "Type of random number generator to use",
  21         ENGINE_CMD_FLAG_STRING
  22         },
  23         { GOST_CTRL_RNG_PARAMS,
  24         "RNG_PARAMS",
  25         "Parameter for random number generator",
  26         ENGINE_CMD_FLAG_STRING
  27         },
  28 */        { GOST_CTRL_CRYPT_PARAMS,
  29                 "CRYPT_PARAMS",
  30                 "OID of default GOST 28147-89 parameters",
  31                 ENGINE_CMD_FLAG_STRING
  32                         },
  33 {0,NULL,NULL,0}
  34         };
  35
  36
  37 int gost_control_func(ENGINE *e,int cmd,long i, void *p, void (*f)(void))
  38         {
  39         int param = cmd-ENGINE_CMD_BASE;
  40         int ret=0;
  41         if (param <0 || param >GOST_PARAM_MAX) return -1;
  42         ret=gost_set_default_param(param,p);
  43         return ret;
  44         }
  45
  46 const char *get_gost_engine_param(int param)
  47         {
  48         char *tmp;
  49         if (param <0 || param >GOST_PARAM_MAX) return NULL;
  50         if (gost_params[param]!=NULL)
  51                 {
  52                 return gost_params[param];
  53                 }
  54         tmp = getenv(gost_envnames[param]);
  55         if (tmp)
  56                 {
  57                 gost_params[param] = strdup(tmp);
  58                 return gost_params[param];
  59                 }
  60         return NULL;
  61         }
  62
  63 int gost_set_default_param(int param, const char *value)
  64         {
  65         const char *tmp;
  66         if (param <0 || param >GOST_PARAM_MAX) return 0;
  67         tmp = getenv(gost_envnames[param]);
  68         /* if there is value in the environment, use it, else -passed string * */
  69         if (!tmp) tmp=value;
  70         if (gost_params[param]) free(gost_params[param]);
  71         gost_params[param] = strdup(tmp);
  72
  73         return 1;
  74         }