gost_ctl.c

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/**********************************************************************
 *                        gost_ctl.c                                  *
 *             Copyright (c) 2005-2006 Cryptocom LTD                  *
 *       This file is distributed under the same license as OpenSSL   *
 *                                                                    *
 *        Implementation of control commands for GOST engine          *
 *            OpenSSL 0.9.9 libraries required                        *
 **********************************************************************/            
#include <stdlib.h>
#include <string.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/engine.h>
#include <openssl/buffer.h>
#include "gost_lcl.h"

static char *gost_params[GOST_PARAM_MAX+1]={NULL};
static const char *gost_envnames[]={"CRYPT_PARAMS"};
const ENGINE_CMD_DEFN gost_cmds[]=
    {
/*  { GOST_CTRL_RNG,
    "RNG",
    "Type of random number generator to use",
    ENGINE_CMD_FLAG_STRING
    },
    { GOST_CTRL_RNG_PARAMS,
    "RNG_PARAMS",
    "Parameter for random number generator",
    ENGINE_CMD_FLAG_STRING
    },
*/    { GOST_CTRL_CRYPT_PARAMS,
        "CRYPT_PARAMS",
        "OID of default GOST 28147-89 parameters",
        ENGINE_CMD_FLAG_STRING
            },
{0,NULL,NULL,0}
    };

void gost_param_free() 
{
    int i;
    for (i=0;i<=GOST_PARAM_MAX;i++) 
        if (gost_params[i]!=NULL) 
            {
            OPENSSL_free(gost_params[i]);
            gost_params[i]=NULL;
            }
        
}

int gost_control_func(ENGINE *e,int cmd,long i, void *p, void (*f)(void))
    {
    int param = cmd-ENGINE_CMD_BASE;
    int ret=0;
    if (param <0 || param >GOST_PARAM_MAX) return -1;
    ret=gost_set_default_param(param,p);
    return ret;
    }

const char *get_gost_engine_param(int param) 
    {
    char *tmp;
    if (param <0 || param >GOST_PARAM_MAX) return NULL;
    if (gost_params[param]!=NULL) 
        {
        return gost_params[param];
        }
    tmp = getenv(gost_envnames[param]);
    if (tmp) 
        {
        if (gost_params[param]) OPENSSL_free(gost_params[param]);
        gost_params[param] = BUF_strdup(tmp);
        return gost_params[param];
        }   
    return NULL;
    }   

int gost_set_default_param(int param, const char *value) 
    {
    const char *tmp;
    if (param <0 || param >GOST_PARAM_MAX) return 0;
    tmp = getenv(gost_envnames[param]);
    /* if there is value in the environment, use it, else -passed string * */
    if (!tmp) tmp=value;
    if (gost_params[param]) OPENSSL_free(gost_params[param]);
    gost_params[param] = BUF_strdup(tmp);

    return 1;
    }