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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* lib/crypto/krb/checksum_dk_cmac.c */
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/*
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* Copyright 2010 by the Massachusetts Institute of Technology.
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* All Rights Reserved.
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*
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* Export of this software from the United States of America may
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* require a specific license from the United States Government.
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* It is the responsibility of any person or organization contemplating
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* export to obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of M.I.T. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. Furthermore if you modify this software you must label
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* your software as modified software and not distribute it in such a
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* fashion that it might be confused with the original M.I.T. software.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*/
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#include "crypto_int.h"
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#define K5CLENGTH 5 /* 32 bit net byte order integer + one byte seed */
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krb5_error_code
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krb5int_dk_cmac_checksum(const struct krb5_cksumtypes *ctp,
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krb5_key key, krb5_keyusage usage,
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const krb5_crypto_iov *data, size_t num_data,
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krb5_data *output)
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{
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const struct krb5_enc_provider *enc = ctp->enc;
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krb5_error_code ret;
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unsigned char constantdata[K5CLENGTH];
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krb5_data datain;
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krb5_key kc;
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/* Derive the key. */
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datain = make_data(constantdata, K5CLENGTH);
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store_32_be(usage, constantdata);
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constantdata[4] = (char) 0x99;
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ret = krb5int_derive_key(enc, NULL, key, &kc, &datain,
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DERIVE_SP800_108_CMAC);
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if (ret != 0)
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return ret;
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/* Hash the data. */
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ret = krb5int_cmac_checksum(enc, kc, data, num_data, output);
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if (ret != 0)
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memset(output->data, 0, output->length);
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krb5_k_free_key(NULL, kc);
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return ret;
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}
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