441 lines
14 KiB
C
441 lines
14 KiB
C
/*
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* WPA Supplicant / shared MSCHAPV2 helper functions / RFC 2433 / RFC 2759
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* Copyright (c) 2004-2006, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include "common.h"
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#include "sha1.h"
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#include "ms_funcs.h"
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#include "crypto.h"
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#include "rc4.h"
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/**
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* challenge_hash - ChallengeHash() - RFC 2759, Sect. 8.2
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* @peer_challenge: 16-octet PeerChallenge (IN)
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* @auth_challenge: 16-octet AuthenticatorChallenge (IN)
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* @username: 0-to-256-char UserName (IN)
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* @username_len: Length of username
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* @challenge: 8-octet Challenge (OUT)
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*/
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static void challenge_hash(const u8 *peer_challenge, const u8 *auth_challenge,
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const u8 *username, size_t username_len,
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u8 *challenge)
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{
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u8 hash[SHA1_MAC_LEN];
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const unsigned char *addr[3];
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size_t len[3];
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addr[0] = peer_challenge;
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len[0] = 16;
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addr[1] = auth_challenge;
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len[1] = 16;
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addr[2] = username;
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len[2] = username_len;
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sha1_vector(3, addr, len, hash);
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os_memcpy(challenge, hash, 8);
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}
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/**
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* nt_password_hash - NtPasswordHash() - RFC 2759, Sect. 8.3
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* @password: 0-to-256-unicode-char Password (IN; ASCII)
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* @password_len: Length of password
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* @password_hash: 16-octet PasswordHash (OUT)
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*/
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void nt_password_hash(const u8 *password, size_t password_len,
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u8 *password_hash)
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{
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u8 buf[512], *pos;
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size_t i, len;
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if (password_len > 256)
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return;
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/* Convert password into unicode */
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for (i = 0; i < password_len; i++) {
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buf[2 * i] = password[i];
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buf[2 * i + 1] = 0;
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}
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len = password_len * 2;
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pos = buf;
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md4_vector(1, (const u8 **) &pos, &len, password_hash);
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}
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/**
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* hash_nt_password_hash - HashNtPasswordHash() - RFC 2759, Sect. 8.4
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* @password_hash: 16-octet PasswordHash (IN)
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* @password_hash_hash: 16-octet PasswordHashHash (OUT)
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*/
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void hash_nt_password_hash(const u8 *password_hash, u8 *password_hash_hash)
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{
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size_t len = 16;
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md4_vector(1, &password_hash, &len, password_hash_hash);
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}
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/**
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* challenge_response - ChallengeResponse() - RFC 2759, Sect. 8.5
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* @challenge: 8-octet Challenge (IN)
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* @password_hash: 16-octet PasswordHash (IN)
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* @response: 24-octet Response (OUT)
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*/
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void challenge_response(const u8 *challenge, const u8 *password_hash,
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u8 *response)
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{
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u8 zpwd[7];
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des_encrypt(challenge, password_hash, response);
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des_encrypt(challenge, password_hash + 7, response + 8);
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zpwd[0] = password_hash[14];
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zpwd[1] = password_hash[15];
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os_memset(zpwd + 2, 0, 5);
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des_encrypt(challenge, zpwd, response + 16);
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}
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/**
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* generate_nt_response - GenerateNTResponse() - RFC 2759, Sect. 8.1
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* @auth_challenge: 16-octet AuthenticatorChallenge (IN)
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* @peer_hallenge: 16-octet PeerChallenge (IN)
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* @username: 0-to-256-char UserName (IN)
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* @username_len: Length of username
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* @password: 0-to-256-unicode-char Password (IN; ASCII)
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* @password_len: Length of password
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* @response: 24-octet Response (OUT)
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*/
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void generate_nt_response(const u8 *auth_challenge, const u8 *peer_challenge,
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const u8 *username, size_t username_len,
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const u8 *password, size_t password_len,
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u8 *response)
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{
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u8 challenge[8];
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u8 password_hash[16];
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challenge_hash(peer_challenge, auth_challenge, username, username_len,
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challenge);
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nt_password_hash(password, password_len, password_hash);
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challenge_response(challenge, password_hash, response);
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}
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/**
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* generate_nt_response_pwhash - GenerateNTResponse() - RFC 2759, Sect. 8.1
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* @auth_challenge: 16-octet AuthenticatorChallenge (IN)
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* @peer_hallenge: 16-octet PeerChallenge (IN)
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* @username: 0-to-256-char UserName (IN)
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* @username_len: Length of username
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* @password_hash: 16-octet PasswordHash (IN)
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* @response: 24-octet Response (OUT)
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*/
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void generate_nt_response_pwhash(const u8 *auth_challenge,
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const u8 *peer_challenge,
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const u8 *username, size_t username_len,
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const u8 *password_hash,
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u8 *response)
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{
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u8 challenge[8];
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challenge_hash(peer_challenge, auth_challenge, username, username_len,
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challenge);
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challenge_response(challenge, password_hash, response);
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}
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/**
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* generate_authenticator_response_pwhash - GenerateAuthenticatorResponse() - RFC 2759, Sect. 8.7
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* @password_hash: 16-octet PasswordHash (IN)
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* @nt_response: 24-octet NT-Response (IN)
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* @peer_challenge: 16-octet PeerChallenge (IN)
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* @auth_challenge: 16-octet AuthenticatorChallenge (IN)
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* @username: 0-to-256-char UserName (IN)
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* @username_len: Length of username
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* @response: 20-octet AuthenticatorResponse (OUT) (note: this value is usually
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* encoded as a 42-octet ASCII string (S=<hexdump of response>)
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*/
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void generate_authenticator_response_pwhash(
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const u8 *password_hash,
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const u8 *peer_challenge, const u8 *auth_challenge,
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const u8 *username, size_t username_len,
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const u8 *nt_response, u8 *response)
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{
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static const u8 magic1[39] = {
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0x4D, 0x61, 0x67, 0x69, 0x63, 0x20, 0x73, 0x65, 0x72, 0x76,
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0x65, 0x72, 0x20, 0x74, 0x6F, 0x20, 0x63, 0x6C, 0x69, 0x65,
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0x6E, 0x74, 0x20, 0x73, 0x69, 0x67, 0x6E, 0x69, 0x6E, 0x67,
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0x20, 0x63, 0x6F, 0x6E, 0x73, 0x74, 0x61, 0x6E, 0x74
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};
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static const u8 magic2[41] = {
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0x50, 0x61, 0x64, 0x20, 0x74, 0x6F, 0x20, 0x6D, 0x61, 0x6B,
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0x65, 0x20, 0x69, 0x74, 0x20, 0x64, 0x6F, 0x20, 0x6D, 0x6F,
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0x72, 0x65, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x6F, 0x6E,
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0x65, 0x20, 0x69, 0x74, 0x65, 0x72, 0x61, 0x74, 0x69, 0x6F,
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0x6E
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};
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u8 password_hash_hash[16], challenge[8];
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const unsigned char *addr1[3];
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const size_t len1[3] = { 16, 24, sizeof(magic1) };
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const unsigned char *addr2[3];
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const size_t len2[3] = { SHA1_MAC_LEN, 8, sizeof(magic2) };
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addr1[0] = password_hash_hash;
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addr1[1] = nt_response;
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addr1[2] = magic1;
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addr2[0] = response;
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addr2[1] = challenge;
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addr2[2] = magic2;
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hash_nt_password_hash(password_hash, password_hash_hash);
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sha1_vector(3, addr1, len1, response);
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challenge_hash(peer_challenge, auth_challenge, username, username_len,
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challenge);
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sha1_vector(3, addr2, len2, response);
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}
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/**
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* generate_authenticator_response - GenerateAuthenticatorResponse() - RFC 2759, Sect. 8.7
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* @password: 0-to-256-unicode-char Password (IN; ASCII)
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* @password_len: Length of password
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* @nt_response: 24-octet NT-Response (IN)
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* @peer_challenge: 16-octet PeerChallenge (IN)
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* @auth_challenge: 16-octet AuthenticatorChallenge (IN)
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* @username: 0-to-256-char UserName (IN)
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* @username_len: Length of username
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* @response: 20-octet AuthenticatorResponse (OUT) (note: this value is usually
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* encoded as a 42-octet ASCII string (S=<hexdump of response>)
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*/
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void generate_authenticator_response(const u8 *password, size_t password_len,
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const u8 *peer_challenge,
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const u8 *auth_challenge,
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const u8 *username, size_t username_len,
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const u8 *nt_response, u8 *response)
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{
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u8 password_hash[16];
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nt_password_hash(password, password_len, password_hash);
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generate_authenticator_response_pwhash(password_hash,
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peer_challenge, auth_challenge,
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username, username_len,
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nt_response, response);
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}
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/**
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* nt_challenge_response - NtChallengeResponse() - RFC 2433, Sect. A.5
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* @challenge: 8-octet Challenge (IN)
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* @password: 0-to-256-unicode-char Password (IN; ASCII)
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* @password_len: Length of password
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* @response: 24-octet Response (OUT)
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*/
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void nt_challenge_response(const u8 *challenge, const u8 *password,
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size_t password_len, u8 *response)
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{
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u8 password_hash[16];
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nt_password_hash(password, password_len, password_hash);
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challenge_response(challenge, password_hash, response);
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}
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/**
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* get_master_key - GetMasterKey() - RFC 3079, Sect. 3.4
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* @password_hash_hash: 16-octet PasswordHashHash (IN)
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* @nt_response: 24-octet NTResponse (IN)
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* @master_key: 16-octet MasterKey (OUT)
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*/
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void get_master_key(const u8 *password_hash_hash, const u8 *nt_response,
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u8 *master_key)
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{
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static const u8 magic1[27] = {
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0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74,
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0x68, 0x65, 0x20, 0x4d, 0x50, 0x50, 0x45, 0x20, 0x4d,
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0x61, 0x73, 0x74, 0x65, 0x72, 0x20, 0x4b, 0x65, 0x79
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};
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const unsigned char *addr[3];
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const size_t len[3] = { 16, 24, sizeof(magic1) };
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u8 hash[SHA1_MAC_LEN];
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addr[0] = password_hash_hash;
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addr[1] = nt_response;
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addr[2] = magic1;
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sha1_vector(3, addr, len, hash);
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os_memcpy(master_key, hash, 16);
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}
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/**
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* get_asymetric_start_key - GetAsymetricStartKey() - RFC 3079, Sect. 3.4
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* @master_key: 16-octet MasterKey (IN)
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* @session_key: 8-to-16 octet SessionKey (OUT)
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* @session_key_len: SessionKeyLength (Length of session_key) (IN)
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* @is_send: IsSend (IN, BOOLEAN)
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* @is_server: IsServer (IN, BOOLEAN)
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*/
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void get_asymetric_start_key(const u8 *master_key, u8 *session_key,
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size_t session_key_len, int is_send,
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int is_server)
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{
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static const u8 magic2[84] = {
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0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
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0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
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0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
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0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20, 0x6b, 0x65, 0x79,
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0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
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0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73, 0x69, 0x64, 0x65,
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0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
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0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
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0x6b, 0x65, 0x79, 0x2e
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};
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static const u8 magic3[84] = {
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0x4f, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x69,
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0x65, 0x6e, 0x74, 0x20, 0x73, 0x69, 0x64, 0x65, 0x2c, 0x20,
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0x74, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20, 0x74, 0x68,
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0x65, 0x20, 0x72, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x20,
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0x6b, 0x65, 0x79, 0x3b, 0x20, 0x6f, 0x6e, 0x20, 0x74, 0x68,
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0x65, 0x20, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x20, 0x73,
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0x69, 0x64, 0x65, 0x2c, 0x20, 0x69, 0x74, 0x20, 0x69, 0x73,
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0x20, 0x74, 0x68, 0x65, 0x20, 0x73, 0x65, 0x6e, 0x64, 0x20,
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0x6b, 0x65, 0x79, 0x2e
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};
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static const u8 shs_pad1[40] = {
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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static const u8 shs_pad2[40] = {
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0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
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0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
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0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2,
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0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2, 0xf2
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};
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u8 digest[SHA1_MAC_LEN];
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const unsigned char *addr[4];
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const size_t len[4] = { 16, 40, 84, 40 };
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addr[0] = master_key;
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addr[1] = shs_pad1;
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if (is_send) {
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addr[2] = is_server ? magic3 : magic2;
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} else {
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addr[2] = is_server ? magic2 : magic3;
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}
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addr[3] = shs_pad2;
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sha1_vector(4, addr, len, digest);
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if (session_key_len > SHA1_MAC_LEN)
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session_key_len = SHA1_MAC_LEN;
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os_memcpy(session_key, digest, session_key_len);
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}
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#define PWBLOCK_LEN 516
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/**
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* encrypt_pw_block_with_password_hash - EncryptPwBlockWithPasswordHash() - RFC 2759, Sect. 8.10
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* @password: 0-to-256-unicode-char Password (IN; ASCII)
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* @password_len: Length of password
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* @password_hash: 16-octet PasswordHash (IN)
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* @pw_block: 516-byte PwBlock (OUT)
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*/
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static void encrypt_pw_block_with_password_hash(
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const u8 *password, size_t password_len,
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const u8 *password_hash, u8 *pw_block)
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{
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size_t i, offset;
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u8 *pos;
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if (password_len > 256)
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return;
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os_memset(pw_block, 0, PWBLOCK_LEN);
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offset = (256 - password_len) * 2;
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os_get_random(pw_block, offset);
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for (i = 0; i < password_len; i++)
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pw_block[offset + i * 2] = password[i];
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/*
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* PasswordLength is 4 octets, but since the maximum password length is
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* 256, only first two (in little endian byte order) can be non-zero.
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*/
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pos = &pw_block[2 * 256];
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WPA_PUT_LE16(pos, password_len * 2);
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rc4(pw_block, PWBLOCK_LEN, password_hash, 16);
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}
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/**
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* new_password_encrypted_with_old_nt_password_hash - NewPasswordEncryptedWithOldNtPasswordHash() - RFC 2759, Sect. 8.9
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* @new_password: 0-to-256-unicode-char NewPassword (IN; ASCII)
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* @new_password_len: Length of new_password
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* @old_password: 0-to-256-unicode-char OldPassword (IN; ASCII)
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* @old_password_len: Length of old_password
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* @encrypted_pw_block: 516-octet EncryptedPwBlock (OUT)
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*/
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void new_password_encrypted_with_old_nt_password_hash(
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const u8 *new_password, size_t new_password_len,
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const u8 *old_password, size_t old_password_len,
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u8 *encrypted_pw_block)
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{
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u8 password_hash[16];
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nt_password_hash(old_password, old_password_len, password_hash);
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encrypt_pw_block_with_password_hash(new_password, new_password_len,
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password_hash, encrypted_pw_block);
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}
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/**
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* nt_password_hash_encrypted_with_block - NtPasswordHashEncryptedWithBlock() - RFC 2759, Sect 8.13
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* @password_hash: 16-octer PasswordHash (IN)
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* @block: 16-octet Block (IN)
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* @cypher: 16-octer Cypher (OUT)
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*/
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static void nt_password_hash_encrypted_with_block(const u8 *password_hash,
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const u8 *block,
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u8 *cypher)
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{
|
|
des_encrypt(password_hash, block, cypher);
|
|
des_encrypt(password_hash + 8, block + 7, cypher + 8);
|
|
}
|
|
|
|
|
|
/**
|
|
* old_nt_password_hash_encrypted_with_new_nt_password_hash - OldNtPasswordHashEncryptedWithNewNtPasswordHash() - RFC 2759, Sect. 8.12
|
|
* @new_password: 0-to-256-unicode-char NewPassword (IN; ASCII)
|
|
* @new_password_len: Length of new_password
|
|
* @old_password: 0-to-256-unicode-char OldPassword (IN; ASCII)
|
|
* @old_password_len: Length of old_password
|
|
* @encrypted_password_ash: 16-octet EncryptedPasswordHash (OUT)
|
|
*/
|
|
void old_nt_password_hash_encrypted_with_new_nt_password_hash(
|
|
const u8 *new_password, size_t new_password_len,
|
|
const u8 *old_password, size_t old_password_len,
|
|
u8 *encrypted_password_hash)
|
|
{
|
|
u8 old_password_hash[16], new_password_hash[16];
|
|
|
|
nt_password_hash(old_password, old_password_len, old_password_hash);
|
|
nt_password_hash(new_password, new_password_len, new_password_hash);
|
|
nt_password_hash_encrypted_with_block(old_password_hash,
|
|
new_password_hash,
|
|
encrypted_password_hash);
|
|
}
|