109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
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/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <ell/ell.h>
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#include "mschaputil.h"
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static bool mschap_des_encrypt(const uint8_t *challenge, const uint8_t *key,
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uint8_t *cipher_text)
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{
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uint8_t pkey[8], tmp;
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int i;
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struct l_cipher *cipher;
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uint8_t next;
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for (i = 0, next = 0; i < 7; ++i) {
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tmp = key[i];
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pkey[i] = (tmp >> i) | next | 1;
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next = tmp << (7 - i);
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}
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pkey[i] = next | 1;
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cipher = l_cipher_new(L_CIPHER_DES, pkey, 8);
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if (!cipher)
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return false;
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l_cipher_encrypt(cipher, challenge, cipher_text, 8);
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l_cipher_free(cipher);
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return true;
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}
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bool mschap_challenge_response(const uint8_t *challenge,
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const uint8_t *password_hash, uint8_t *response)
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{
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uint8_t buf[21];
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memset(buf, 0, sizeof(buf));
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memcpy(buf, password_hash, 16);
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if (!mschap_des_encrypt(challenge, buf + 0, response + 0))
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return false;
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if (!mschap_des_encrypt(challenge, buf + 7, response + 8))
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return false;
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if (!mschap_des_encrypt(challenge, buf + 14, response + 16))
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return false;
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return true;
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}
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bool mschap_nt_password_hash(const char *password, uint8_t *password_hash)
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{
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size_t size = l_utf8_strlen(password);
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size_t bsize = strlen(password);
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uint16_t buffer[size];
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unsigned int i, pos;
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struct l_checksum *check;
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for (i = 0, pos = 0; i < size; ++i) {
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wchar_t val;
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pos += l_utf8_get_codepoint(password + pos, bsize - pos, &val);
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if (val > 0xFFFF) {
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l_error("Encountered password with value not valid in "
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"ucs-2");
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return false;
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}
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buffer[i] = L_CPU_TO_LE16(val);
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}
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check = l_checksum_new(L_CHECKSUM_MD4);
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if (!check)
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return false;
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l_checksum_update(check, (uint8_t *) buffer, size * 2);
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l_checksum_get_digest(check, password_hash, 16);
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l_checksum_free(check);
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return true;
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}
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