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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* lib/crypto/keyhash_provider/md5_hmac.c
*
* Copyright 2001, 2009 by the Massachusetts Institute of Technology.
* 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 M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* Implementation of Microsoft KERB_CHECKSUM_MD5_HMAC
*/
#include "k5-int.h"
#include "keyhash_provider.h"
#include "arcfour-int.h"
#include "rsa-md5.h"
#include "hash_provider.h"
static krb5_error_code
k5_md5_hmac_hash(krb5_key key, krb5_keyusage usage, const krb5_data *input,
krb5_data *output)
{
krb5_keyusage ms_usage;
krb5_MD5_CTX ctx;
unsigned char t[4];
krb5_crypto_iov iov;
krb5int_MD5Init(&ctx);
ms_usage = krb5int_arcfour_translate_usage(usage);
store_32_le(ms_usage, t);
krb5int_MD5Update(&ctx, t, sizeof(t));
krb5int_MD5Update(&ctx, (unsigned char *)input->data, input->length);
krb5int_MD5Final(&ctx);
iov.flags = KRB5_CRYPTO_TYPE_DATA;
iov.data = make_data(ctx.digest, 16);
return krb5int_hmac(&krb5int_hash_md5, key, &iov, 1, output);
}
const struct krb5_keyhash_provider krb5int_keyhash_md5_hmac = {
16,
k5_md5_hmac_hash,
NULL, /*checksum again*/
NULL, NULL
};
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