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/crypto.h>
  12 #include <openssl/err.h>
  13 #include <openssl/engine.h>
  14 #include <openssl/buffer.h>
  15 #include "gost_lcl.h"
  16
  17 static char *gost_params[GOST_PARAM_MAX + 1] = { NULL };
  18 static const char *gost_envnames[] = { "CRYPT_PARAMS" };
  19
  20 const ENGINE_CMD_DEFN gost_cmds[] = {
  21 /*- { GOST_CTRL_RNG,
  22     "RNG",
  23     "Type of random number generator to use",
  24     ENGINE_CMD_FLAG_STRING
  25     },
  26     { GOST_CTRL_RNG_PARAMS,
  27     "RNG_PARAMS",
  28     "Parameter for random number generator",
  29     ENGINE_CMD_FLAG_STRING
  30     },
  31 */ {GOST_CTRL_CRYPT_PARAMS,
  32            "CRYPT_PARAMS",
  33            "OID of default GOST 28147-89 parameters",
  34            ENGINE_CMD_FLAG_STRING},
  35     {0, NULL, NULL, 0}
  36 };
  37
  38 void gost_param_free()
  39 {
  40     int i;
  41
  42     for (i = 0; i <= GOST_PARAM_MAX; i++) {
  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)
  54         return -1;
  55     ret = gost_set_default_param(param, p);
  56     return ret;
  57 }
  58
  59 const char *get_gost_engine_param(int param)
  60 {
  61     char *tmp;
  62     if (param < 0 || param > GOST_PARAM_MAX)
  63         return NULL;
  64     if (gost_params[param] != NULL) {
  65         return gost_params[param];
  66     }
  67     tmp = getenv(gost_envnames[param]);
  68     if (tmp) {
  69         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)
  80         return 0;
  81     tmp = getenv(gost_envnames[param]);
  82     /*
  83      * if there is value in the environment, use it, else -passed string *
  84      */
  85     if (!tmp)
  86         tmp = value;
  87     OPENSSL_free(gost_params[param]);
  88     gost_params[param] = BUF_strdup(tmp);
  89
  90     return 1;
  91 }