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cpor-keys.c
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/*
* cpor-keys.c
*
* Copyright (c) 2010, Zachary N J Peterson <[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Naval Postgraduate School nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ZACHARY N J PETERSON ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ZACHARY N J PETERSON BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "cpor.h"
CPOR_key *allocate_cpor_key(){
CPOR_key *key = NULL;
if( ((key = malloc(sizeof(CPOR_key))) == NULL)) goto cleanup;
if( ((key->k_enc = malloc(params.enc_key_size)) == NULL)) goto cleanup;
key->k_enc_size = params.enc_key_size;
if( ((key->k_mac = malloc(params.mac_key_size)) == NULL)) goto cleanup;
key->k_mac_size = params.mac_key_size;
key->global = NULL;
return key;
cleanup:
if(key) destroy_cpor_key(key);
return NULL;
}
void destroy_cpor_key(CPOR_key *key){
if(!key) return;
if(key->k_enc) sfree(key->k_enc, params.enc_key_size);
key->k_enc_size = 0;
if(key->k_mac) sfree(key->k_mac, params.mac_key_size);
key->k_mac_size = 0;
if(key->global) destroy_cpor_global(key->global);
sfree(key, sizeof(CPOR_key));
return;
}
//Read keys from disk
CPOR_key *cpor_get_keys(){
CPOR_key *key = NULL;
FILE *keyfile = NULL;
size_t Zp_size = 0;
unsigned char *Zp = NULL;
if( ((key = allocate_cpor_key()) == NULL)) goto cleanup;
if( ((key->global = allocate_cpor_global()) == NULL)) goto cleanup;
keyfile = fopen("./cpor.key", "r");
if(!keyfile){
fprintf(stderr, "ERROR: Was not able to create keyfile.\n");
goto cleanup;
}
fread(&key->k_enc_size, sizeof(size_t), 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fread(key->k_enc, key->k_enc_size, 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fread(&key->k_mac_size, sizeof(size_t), 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fread(key->k_mac, key->k_mac_size, 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fread(&Zp_size, sizeof(size_t), 1, keyfile);
if(ferror(keyfile)) goto cleanup;
if( ((Zp = malloc(Zp_size)) == NULL)) goto cleanup;
memset(Zp, 0, Zp_size);
fread(Zp, Zp_size, 1, keyfile);
if(ferror(keyfile)) goto cleanup;
if(!BN_bin2bn(Zp, Zp_size, key->global->Zp)) goto cleanup;
if(Zp) sfree(Zp, Zp_size);
if(keyfile) fclose(keyfile);
return key;
cleanup:
if(Zp) sfree(Zp, Zp_size);
if(keyfile) fclose(keyfile);
if(key) destroy_cpor_key(key);
return NULL;
}
//TODO: This is totally insecure -- keys are written unencrypted to the disk. Take a look at the PDP key stuff.
/* Create and write keys.*/
CPOR_key *cpor_create_new_keys(){
CPOR_key *key = NULL;
FILE *keyfile = NULL;
size_t Zp_size = 0;
unsigned char *Zp = NULL;
if( ((key = allocate_cpor_key()) == NULL)) goto cleanup;
if( ((key->global = cpor_create_global(params.Zp_bits)) == NULL)) goto cleanup;
if(!RAND_bytes(key->k_enc, params.enc_key_size)) goto cleanup;
key->k_enc_size = params.enc_key_size;
if(!RAND_bytes(key->k_mac, params.mac_key_size)) goto cleanup;
key->k_mac_size = params.mac_key_size;
/* Check to see if the key file exists */
//TODO, fix this
/*
if( (access("./cpor.key", F_OK) == 0)){
fprintf(stdout, "WARNING: Key files for %s already exist; do you want to overwite (y/N)?", filepath);
scanf("%c", &yesorno);
if(yesorno != 'y') goto exit;
}
*/
keyfile = fopen("./cpor.key", "w");
if(!keyfile){
fprintf(stderr, "ERROR: Was not able to create keyfile.\n");
goto cleanup;
}
fwrite(&key->k_enc_size, sizeof(size_t), 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fwrite(key->k_enc, key->k_enc_size, 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fwrite(&key->k_mac_size, sizeof(size_t), 1, keyfile);
if(ferror(keyfile)) goto cleanup;
fwrite(key->k_mac, key->k_mac_size, 1, keyfile);
if(ferror(keyfile)) goto cleanup;
Zp_size = BN_num_bytes(key->global->Zp);
fwrite(&Zp_size, sizeof(size_t), 1, keyfile);
if( ((Zp = malloc(Zp_size)) == NULL)) goto cleanup;
memset(Zp, 0, Zp_size);
if(!BN_bn2bin(key->global->Zp, Zp)) goto cleanup;
fwrite(Zp, Zp_size, 1, keyfile);
if(keyfile) fclose(keyfile);
if(Zp) sfree(Zp, Zp_size);
return key;
cleanup:
if(key) destroy_cpor_key(key);
if(keyfile) fclose(keyfile);
if(Zp) sfree(Zp, Zp_size);
return NULL;
}