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/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "k5-int.h"
#include "etypes.h"
#include "dk.h"
#include "aead.h"
#define K5CLENGTH 5 /* 32 bit net byte order integer + one byte seed */
krb5_error_code
krb5_dk_make_checksum(const struct krb5_hash_provider *hash,
krb5_key key, krb5_keyusage usage,
const krb5_data *input, krb5_data *output)
{
const struct krb5_keytypes *ktp;
const struct krb5_enc_provider *enc;
krb5_error_code ret;
unsigned char constantdata[K5CLENGTH];
krb5_data datain;
krb5_key kc;
ktp = find_enctype(key->keyblock.enctype);
if (ktp == NULL)
return KRB5_BAD_ENCTYPE;
enc = ktp->enc;
/*
* key->length will be tested in enc->encrypt.
* output->length will be tested in krb5_hmac.
*/
/* Derive the key. */
datain.data = (char *) constantdata;
datain.length = K5CLENGTH;
store_32_be(usage, constantdata);
datain.data[4] = (char) 0x99;
ret = krb5_derive_key(enc, key, &kc, &datain);
if (ret)
return ret;
/* hash the data */
datain = *input;
ret = krb5_hmac(hash, kc, 1, &datain, output);
if (ret)
memset(output->data, 0, output->length);
krb5_k_free_key(NULL, kc);
return ret;
}
krb5_error_code
krb5int_dk_make_checksum_iov(const struct krb5_hash_provider *hash,
krb5_key key, krb5_keyusage usage,
const krb5_crypto_iov *data, size_t num_data,
krb5_data *output)
{
const struct krb5_keytypes *ktp;
const struct krb5_enc_provider *enc;
krb5_error_code ret;
unsigned char constantdata[K5CLENGTH];
krb5_data datain;
krb5_key kc;
ktp = find_enctype(key->keyblock.enctype);
if (ktp == NULL)
return KRB5_BAD_ENCTYPE;
enc = ktp->enc;
/*
* key->length will be tested in enc->encrypt.
* output->length will be tested in krb5_hmac.
*/
/* Derive the key. */
datain.data = (char *) constantdata;
datain.length = K5CLENGTH;
store_32_be(usage, constantdata);
datain.data[4] = (char) 0x99;
ret = krb5_derive_key(enc, key, &kc, &datain);
if (ret)
return ret;
/* Hash the data. */
ret = krb5int_hmac_iov(hash, kc, data, num_data, output);
if (ret)
memset(output->data, 0, output->length);
krb5_k_free_key(NULL, kc);
return ret;
}
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