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Added missing file.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
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Pol Henarejos 2023-02-05 00:00:47 +01:00
parent 9310e1af55
commit 02a5695b61
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tool/kdf_calc.py Normal file
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"""
kdf_calc.py - a library for calculating hash by KDF
Copyright (C) 2018 Free Software Initiative of Japan
Author: NIIBE Yutaka <gniibe@fsij.org>
This file is a part of Gnuk, a GnuPG USB Token implementation.
Gnuk 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 3 of the License, or
(at your option) any later version.
Gnuk 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, see <http://www.gnu.org/licenses/>.
"""
from cffi import FFI
import platform
DEF_gcry_kdf_derive="""
typedef unsigned int gpg_error_t;
gpg_error_t gcry_kdf_derive (const void *passphrase, size_t passphraselen,
int algo, int subalgo, const void *salt,
size_t saltlen, unsigned long iterations,
size_t keysize, void *keybuffer);
"""
GCRY_KDF_ITERSALTED_S2K = 19
GCRY_MD_SHA256 = 8
def kdf_calc(pw_string, salt_byte, iterations):
ffi = FFI()
ffi.cdef(DEF_gcry_kdf_derive)
if (platform.system() == 'Darwin'):
libgcrypt = ffi.dlopen("libgcrypt.20.dylib")
else:
libgcrypt = ffi.dlopen("libgcrypt.so.20")
if isinstance(pw_string, str):
pw_byte = pw_string.encode('UTF-8')
else:
pw_byte = pw_string
pw=ffi.new("char []", pw_byte)
salt = ffi.new("char []", salt_byte)
kb = ffi.new("char []", 32)
r = libgcrypt.gcry_kdf_derive(pw, len(pw_string), GCRY_KDF_ITERSALTED_S2K,
GCRY_MD_SHA256, salt, 8, iterations, 32, kb)
if r != 0:
raise ValueError("libgcrypt error", r)
return ffi.unpack(kb, 32)