137 lines
4.0 KiB
C
137 lines
4.0 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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int _krb5_AES_SHA2_string_to_default_iterator = 32768;
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static krb5_error_code
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AES_SHA2_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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krb5_error_code ret;
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uint32_t iter;
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struct _krb5_encryption_type *et = NULL;
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struct _krb5_key_data kd;
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krb5_data saltp;
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size_t enctypesz;
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const EVP_MD *md = NULL;
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krb5_data_zero(&saltp);
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kd.key = NULL;
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kd.schedule = NULL;
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if (opaque.length == 0) {
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iter = _krb5_AES_SHA2_string_to_default_iterator;
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} else if (opaque.length == 4) {
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unsigned long v;
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_krb5_get_int(opaque.data, &v, 4);
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iter = ((uint32_t)v);
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} else {
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ret = KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
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goto cleanup;
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}
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et = _krb5_find_enctype(enctype);
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if (et == NULL) {
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ret = KRB5_PROG_KEYTYPE_NOSUPP;
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goto cleanup;
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}
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kd.schedule = NULL;
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ALLOC(kd.key, 1);
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if (kd.key == NULL) {
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ret = krb5_enomem(context);
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goto cleanup;
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}
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kd.key->keytype = enctype;
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ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
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if (ret) {
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ret = krb5_enomem(context);
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goto cleanup;
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}
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enctypesz = strlen(et->name) + 1;
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ret = krb5_data_alloc(&saltp, enctypesz + salt.saltvalue.length);
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if (ret) {
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ret = krb5_enomem(context);
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goto cleanup;
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}
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memcpy(saltp.data, et->name, enctypesz);
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if (salt.saltvalue.length)
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memcpy((unsigned char *)saltp.data + enctypesz,
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salt.saltvalue.data, salt.saltvalue.length);
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ret = _krb5_aes_sha2_md_for_enctype(context, enctype, &md);
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if (ret)
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goto cleanup;
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ret = PKCS5_PBKDF2_HMAC(password.data, password.length,
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saltp.data, saltp.length,
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iter, md,
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et->keytype->size, kd.key->keyvalue.data);
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if (ret != 1) {
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krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
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"Error calculating s2k");
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ret = KRB5_PROG_KEYTYPE_NOSUPP;
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goto cleanup;
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}
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ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
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if (ret)
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goto cleanup;
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ret = krb5_copy_keyblock_contents(context, kd.key, key);
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if (ret)
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goto cleanup;
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cleanup:
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krb5_data_free(&saltp);
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_krb5_free_key_data(context, &kd, et);
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return ret;
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}
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struct salt_type _krb5_AES_SHA2_salt[] = {
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{
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KRB5_PW_SALT,
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"pw-salt",
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AES_SHA2_string_to_key
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},
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{ 0, NULL, NULL }
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};
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