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/*
* key derivation routines
*
* Copyright (C) 2014-2018 LastPass.
*
* 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.
*
* See LICENSE.OpenSSL for more details regarding this exception.
*/
#include "kdf.h"
#include "util.h"
#include <string.h>
#include <sys/mman.h>
#include <openssl/evp.h>
#include <openssl/sha.h>
#include <openssl/opensslv.h>
#if defined(__APPLE__) && defined(__MACH__)
#include <CommonCrypto/CommonCryptor.h>
#include <CommonCrypto/CommonKeyDerivation.h>
static void pbkdf2_hash(const char *username, size_t username_len, const char *password, size_t password_len, int iterations, unsigned char hash[KDF_HASH_LEN])
{
if (CCKeyDerivationPBKDF(kCCPBKDF2, password, password_len, (const uint8_t *)username, username_len, kCCPRFHmacAlgSHA256, iterations, hash, KDF_HASH_LEN) == kCCParamError)
die("Failed to compute PBKDF2 for %s", username);
}
#else
#include "pbkdf2.h"
static void pbkdf2_hash(const char *username, size_t username_len, const char *password, size_t password_len, int iterations, unsigned char hash[KDF_HASH_LEN])
{
if (!PKCS5_PBKDF2_HMAC(password, password_len, (const unsigned char *)username, username_len, iterations, EVP_sha256(), KDF_HASH_LEN, hash))
die("Failed to compute PBKDF2 for %s", username);
}
#endif
static inline void fail_invalid_iteration_count() {
die("Action required: Your current iteration count does not meet the minimum number of %d iterations . Increase the iteration count on another client that supports iteration number setting.", MINIMUM_ITERATIONS);
}
void kdf_login_key(const char *username, const char *password, int iterations, char hex[KDF_HEX_LEN])
{
unsigned char hash[KDF_HASH_LEN];
size_t password_len;
_cleanup_free_ char *user_lower = xstrlower(username);
password_len = strlen(password);
if (iterations < MINIMUM_ITERATIONS)
fail_invalid_iteration_count();
pbkdf2_hash(user_lower, strlen(user_lower), password, password_len, iterations, hash);
pbkdf2_hash(password, password_len, (char *)hash, KDF_HASH_LEN, 1, hash);
bytes_to_hex(hash, &hex, KDF_HASH_LEN);
mlock(hex, KDF_HEX_LEN);
}
void kdf_decryption_key(const char *username, const char *password, int iterations, unsigned char hash[KDF_HASH_LEN])
{
_cleanup_free_ char *user_lower = xstrlower(username);
if (iterations < MINIMUM_ITERATIONS)
fail_invalid_iteration_count();
pbkdf2_hash(user_lower, strlen(user_lower), password, strlen(password), iterations, hash);
mlock(hash, KDF_HASH_LEN);
}
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