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gost_ctl.c
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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"};
20  {
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  },
32  "CRYPT_PARAMS",
33  "OID of default GOST 28147-89 parameters",
35  },
36 {0,NULL,NULL,0}
37  };
38 
40 {
41  int i;
42  for (i=0;i<=GOST_PARAM_MAX;i++)
43  if (gost_params[i]!=NULL)
44  {
45  OPENSSL_free(gost_params[i]);
46  gost_params[i]=NULL;
47  }
48 
49 }
50 
51 int gost_control_func(ENGINE *e,int cmd,long i, void *p, void (*f)(void))
52  {
53  int param = cmd-ENGINE_CMD_BASE;
54  int ret=0;
55  if (param <0 || param >GOST_PARAM_MAX) return -1;
56  ret=gost_set_default_param(param,p);
57  return ret;
58  }
59 
60 const char *get_gost_engine_param(int param)
61  {
62  char *tmp;
63  if (param <0 || param >GOST_PARAM_MAX) return NULL;
64  if (gost_params[param]!=NULL)
65  {
66  return gost_params[param];
67  }
68  tmp = getenv(gost_envnames[param]);
69  if (tmp)
70  {
71  if (gost_params[param]) OPENSSL_free(gost_params[param]);
72  gost_params[param] = BUF_strdup(tmp);
73  return gost_params[param];
74  }
75  return NULL;
76  }
77 
78 int gost_set_default_param(int param, const char *value)
79  {
80  const char *tmp;
81  if (param <0 || param >GOST_PARAM_MAX) return 0;
82  tmp = getenv(gost_envnames[param]);
83  /* if there is value in the environment, use it, else -passed string * */
84  if (!tmp) tmp=value;
85  if (gost_params[param]) OPENSSL_free(gost_params[param]);
86  gost_params[param] = BUF_strdup(tmp);
87 
88  return 1;
89  }