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/*
* Cryptographic routines for faifa using OpenSSL
*
* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <openssl/sha.h>
#include "crypto.h"
#define HASH_SIZ SHA256_DIGEST_LENGTH
unsigned char hash_value[HASH_SIZ];
u_int8_t dak_salt[SALT_SIZ] = {0x08, 0x85, 0x6D, 0xAF, 0x7C, 0xF5, 0x81, 0x85};
u_int8_t nmk_salt[SALT_SIZ] = {0x08, 0x85, 0x6D, 0xAF, 0x7C, 0xF5, 0x81, 0x86};
/**
* init_salted_secret - initialise a secret using a salt
* @secret: secret to initialise will be modified
* @isecret: initialisation secret
* @salt: secret to initialise with
*/
void init_salted_secret(struct salted_secret *secret, const unsigned char *isecret, const unsigned char *isalt)
{
unsigned char l = ' ';
secret->len = 0;
memset(secret->value, 0, sizeof(secret->value));
if (isecret) {
l = (unsigned char)strlen((char *)isecret);
if (l > MAX_SECRET_SIZ)
l = MAX_SECRET_SIZ;
memcpy(secret->value, (unsigned char *)isecret, l);
}
if (!isalt)
l = 16;
secret->len = (unsigned char) (secret->len + l);
if (isalt) {
memcpy(&secret->value[secret->len], (unsigned char*)isalt, SALT_SIZ);
secret->len += SALT_SIZ;
}
}
/**
* hash_hpav - hash a secret with a salt as HomePlug AV requires it
* @isecret: initialisation secret
* @salt: salt to initialise the secret with
*/
const unsigned char* hash_hpav(const unsigned char* isecret, const unsigned char *salt)
{
SHA256_CTX context;
struct salted_secret secret;
int i, max;
/* Null salt is the NetworkID */
if (!salt)
max = 4;
else
max = 999;
SHA256_Init(&context);
memset(hash_value, 0, sizeof(hash_value));
init_salted_secret(&secret, isecret, salt);
SHA256_Update(&context, secret.value, secret.len);
SHA256_Final(hash_value, &context);
/* Do it 998 times as the standard requires it
* or only 4 times if we use the NID */
for(i = 0; i < max; i++) {
SHA256_Init(&context);
SHA256_Update(&context, hash_value, HASH_SIZ);
SHA256_Final(hash_value, &context);
}
return hash_value;
}
int gen_passphrase(const char *password, u_int8_t *key, const unsigned char *salt)
{
unsigned char password_cpy[MAX_SECRET_SIZ + 1];
const unsigned char *password_hash;
/* Use a local variable to store the input password */
memcpy((unsigned char *)password_cpy, password, MAX_SECRET_SIZ);
password_hash = (const unsigned char *)malloc(HASH_SIZ);
if (!password_hash) {
perror("malloc");
return -1;
}
password_hash = hash_hpav(password_cpy, salt);
memcpy(key, password_hash, 16);
return 0;
}
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