1d9072f026
lib/krb5/crypto.c was a large, monolithic block of code which made it very difficult to selectively enable and disable particular alogrithms. Reorganise crypto.c into individual files for each encryption and salt time, and place the structures which tie everything together into their own file (crypto-algs.c) Add a non-installed library (librfc3961) and test program (test_rfc3961) which builds a minimal rfc3961 crypto library, and checks that it is usable.
225 lines
6.7 KiB
C
225 lines
6.7 KiB
C
/*
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* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#ifdef HEIM_WEAK_CRYPTO
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#ifdef ENABLE_AFS_STRING_TO_KEY
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/* This defines the Andrew string_to_key function. It accepts a password
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* string as input and converts it via a one-way encryption algorithm to a DES
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* encryption key. It is compatible with the original Andrew authentication
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* service password database.
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*/
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/*
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* Short passwords, i.e 8 characters or less.
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*/
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static void
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krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
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krb5_data cell,
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DES_cblock *key)
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{
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char password[8+1]; /* crypt is limited to 8 chars anyway */
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int i;
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for(i = 0; i < 8; i++) {
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char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
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((i < cell.length) ?
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tolower(((unsigned char*)cell.data)[i]) : 0);
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password[i] = c ? c : 'X';
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}
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password[8] = '\0';
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memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
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/* parity is inserted into the LSB so left shift each byte up one
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bit. This allows ascii characters with a zero MSB to retain as
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much significance as possible. */
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for (i = 0; i < sizeof(DES_cblock); i++)
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((unsigned char*)key)[i] <<= 1;
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DES_set_odd_parity (key);
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}
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/*
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* Long passwords, i.e 9 characters or more.
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*/
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static void
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krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
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krb5_data cell,
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DES_cblock *key)
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{
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DES_key_schedule schedule;
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DES_cblock temp_key;
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DES_cblock ivec;
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char password[512];
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size_t passlen;
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memcpy(password, pw.data, min(pw.length, sizeof(password)));
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if(pw.length < sizeof(password)) {
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int len = min(cell.length, sizeof(password) - pw.length);
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int i;
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memcpy(password + pw.length, cell.data, len);
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for (i = pw.length; i < pw.length + len; ++i)
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password[i] = tolower((unsigned char)password[i]);
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}
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passlen = min(sizeof(password), pw.length + cell.length);
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memcpy(&ivec, "kerberos", 8);
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memcpy(&temp_key, "kerberos", 8);
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DES_set_odd_parity (&temp_key);
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DES_set_key_unchecked (&temp_key, &schedule);
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DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
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memcpy(&temp_key, &ivec, 8);
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DES_set_odd_parity (&temp_key);
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DES_set_key_unchecked (&temp_key, &schedule);
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DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
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memset(&schedule, 0, sizeof(schedule));
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memset(&temp_key, 0, sizeof(temp_key));
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memset(&ivec, 0, sizeof(ivec));
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memset(password, 0, sizeof(password));
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DES_set_odd_parity (key);
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}
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static krb5_error_code
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DES_AFS3_string_to_key(krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_salt salt,
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krb5_data opaque,
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krb5_keyblock *key)
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{
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DES_cblock tmp;
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if(password.length > 8)
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krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
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else
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krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
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key->keytype = enctype;
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krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
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memset(&key, 0, sizeof(key));
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return 0;
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}
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#endif /* ENABLE_AFS_STRING_TO_KEY */
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static void
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DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
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{
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DES_key_schedule schedule;
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int i;
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int reverse = 0;
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unsigned char *p;
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unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
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0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
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memset(key, 0, 8);
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p = (unsigned char*)key;
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for (i = 0; i < length; i++) {
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unsigned char tmp = data[i];
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if (!reverse)
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*p++ ^= (tmp << 1);
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else
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*--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
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if((i % 8) == 7)
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reverse = !reverse;
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}
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DES_set_odd_parity(key);
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if(DES_is_weak_key(key))
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(*key)[7] ^= 0xF0;
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DES_set_key_unchecked(key, &schedule);
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DES_cbc_cksum((void*)data, key, length, &schedule, key);
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memset(&schedule, 0, sizeof(schedule));
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DES_set_odd_parity(key);
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if(DES_is_weak_key(key))
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(*key)[7] ^= 0xF0;
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}
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static krb5_error_code
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krb5_DES_string_to_key(krb5_context context,
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krb5_enctype enctype,
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krb5_data password,
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krb5_salt salt,
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krb5_data opaque,
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krb5_keyblock *key)
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{
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unsigned char *s;
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size_t len;
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DES_cblock tmp;
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#ifdef ENABLE_AFS_STRING_TO_KEY
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if (opaque.length == 1) {
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unsigned long v;
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_krb5_get_int(opaque.data, &v, 1);
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if (v == 1)
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return DES_AFS3_string_to_key(context, enctype, password,
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salt, opaque, key);
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}
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#endif
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len = password.length + salt.saltvalue.length;
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s = malloc(len);
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if(len > 0 && s == NULL) {
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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memcpy(s, password.data, password.length);
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memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
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DES_string_to_key_int(s, len, &tmp);
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key->keytype = enctype;
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krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
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memset(&tmp, 0, sizeof(tmp));
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memset(s, 0, len);
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free(s);
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return 0;
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}
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struct salt_type _krb5_des_salt[] = {
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{
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KRB5_PW_SALT,
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"pw-salt",
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krb5_DES_string_to_key
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},
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#ifdef ENABLE_AFS_STRING_TO_KEY
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{
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KRB5_AFS3_SALT,
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"afs3-salt",
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DES_AFS3_string_to_key
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},
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#endif
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{ 0 }
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};
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#endif
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