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 <openssl/buffer.h>
  13 #include "gost_lcl.h"
  14
  15 static char *gost_params[GOST_PARAM_MAX+1]={NULL};
  16 static const char *gost_envnames[]={"CRYPT_PARAMS"};
  17 const ENGINE_CMD_DEFN gost_cmds[]=
  18         {
  19 /*      { GOST_CTRL_RNG,
  20         "RNG",
  21         "Type of random number generator to use",
  22         ENGINE_CMD_FLAG_STRING
  23         },
  24         { GOST_CTRL_RNG_PARAMS,
  25         "RNG_PARAMS",
  26         "Parameter for random number generator",
  27         ENGINE_CMD_FLAG_STRING
  28         },
  29 */        { GOST_CTRL_CRYPT_PARAMS,
  30                 "CRYPT_PARAMS",
  31                 "OID of default GOST 28147-89 parameters",
  32                 ENGINE_CMD_FLAG_STRING
  33                         },
  34 {0,NULL,NULL,0}
  35         };
  36
  37 void gost_param_free()
  38 {
  39         int i;
  40         for (i=0;i<=GOST_PARAM_MAX;i++)
  41                 if (gost_params[i]!=NULL)
  42                         {
  43                         OPENSSL_free(gost_params[i]);
  44                         gost_params[i]=NULL;
  45                         }
  46
  47 }
  48
  49 int gost_control_func(ENGINE *e,int cmd,long i, void *p, void (*f)(void))
  50         {
  51         int param = cmd-ENGINE_CMD_BASE;
  52         int ret=0;
  53         if (param <0 || param >GOST_PARAM_MAX) return -1;
  54         ret=gost_set_default_param(param,p);
  55         return ret;
  56         }
  57
  58 const char *get_gost_engine_param(int param)
  59         {
  60         char *tmp;
  61         if (param <0 || param >GOST_PARAM_MAX) return NULL;
  62         if (gost_params[param]!=NULL)
  63                 {
  64                 return gost_params[param];
  65                 }
  66         tmp = getenv(gost_envnames[param]);
  67         if (tmp)
  68                 {
  69                 if (gost_params[param]) OPENSSL_free(gost_params[param]);
  70                 gost_params[param] = BUF_strdup(tmp);
  71                 return gost_params[param];
  72                 }
  73         return NULL;
  74         }
  75
  76 int gost_set_default_param(int param, const char *value)
  77         {
  78         const char *tmp;
  79         if (param <0 || param >GOST_PARAM_MAX) return 0;
  80         tmp = getenv(gost_envnames[param]);
  81         /* if there is value in the environment, use it, else -passed string * */
  82         if (!tmp) tmp=value;
  83         if (gost_params[param]) OPENSSL_free(gost_params[param]);
  84         gost_params[param] = BUF_strdup(tmp);
  85
  86         return 1;
  87         }