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/*
* Argon2 PBKDF2 library wrapper
*
* Copyright (C) 2016-2024 Red Hat, Inc. All rights reserved.
* Copyright (C) 2016-2024 Milan Broz
*
* This file is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This file 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <errno.h>
#include "crypto_backend_internal.h"
#if HAVE_ARGON2_H
#include <argon2.h>
#else
#include "argon2/argon2.h"
#endif
#define CONST_CAST(x) (x)(uintptr_t)
#if USE_INTERNAL_ARGON2 || HAVE_ARGON2_H
int argon2(const char *type, const char *password, size_t password_length,
const char *salt, size_t salt_length,
char *key, size_t key_length,
uint32_t iterations, uint32_t memory, uint32_t parallel)
{
argon2_type atype;
argon2_context context = {
.flags = ARGON2_DEFAULT_FLAGS,
.version = ARGON2_VERSION_NUMBER,
.t_cost = (uint32_t)iterations,
.m_cost = (uint32_t)memory,
.lanes = (uint32_t)parallel,
.threads = (uint32_t)parallel,
.out = (uint8_t *)key,
.outlen = (uint32_t)key_length,
.pwd = CONST_CAST(uint8_t *)password,
.pwdlen = (uint32_t)password_length,
.salt = CONST_CAST(uint8_t *)salt,
.saltlen = (uint32_t)salt_length,
};
int r;
/* This code must not be run if crypt backend library natively supports Argon2 */
assert(!(crypt_backend_flags() & CRYPT_BACKEND_ARGON2));
if (!strcmp(type, "argon2i"))
atype = Argon2_i;
else if(!strcmp(type, "argon2id"))
atype = Argon2_id;
else
return -EINVAL;
switch (argon2_ctx(&context, atype)) {
case ARGON2_OK:
r = 0;
break;
case ARGON2_MEMORY_ALLOCATION_ERROR:
case ARGON2_FREE_MEMORY_CBK_NULL:
case ARGON2_ALLOCATE_MEMORY_CBK_NULL:
r = -ENOMEM;
break;
default:
r = -EINVAL;
}
return r;
}
#else /* USE_INTERNAL_ARGON2 || HAVE_ARGON2_H */
#pragma GCC diagnostic ignored "-Wunused-parameter"
int argon2(const char *type, const char *password, size_t password_length,
const char *salt, size_t salt_length,
char *key, size_t key_length,
uint32_t iterations, uint32_t memory, uint32_t parallel)
{
return -EINVAL;
}
#endif
/* Additional string for crypt backend version */
const char *crypt_argon2_version(void)
{
const char *version = "";
if (crypt_backend_flags() & CRYPT_BACKEND_ARGON2)
return version;
#if HAVE_ARGON2_H /* this has priority over internal argon2 */
version = " [external libargon2]";
#elif USE_INTERNAL_ARGON2
version = " [cryptsetup libargon2]";
#endif
return version;
}
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