/usr/include/isc/hmacmd5.h is in libbind-dev 1:9.9.5.dfsg-3ubuntu0.19.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: hmacmd5.h,v 1.14 2009/02/06 23:47:42 tbox Exp $ */
/*! \file isc/hmacmd5.h
* \brief This is the header file for the HMAC-MD5 keyed hash algorithm
* described in RFC2104.
*/
#ifndef ISC_HMACMD5_H
#define ISC_HMACMD5_H 1
#include <isc/lang.h>
#include <isc/md5.h>
#include <isc/platform.h>
#include <isc/types.h>
#define ISC_HMACMD5_KEYLENGTH 64
#ifdef ISC_PLATFORM_OPENSSLHASH
#include <openssl/hmac.h>
typedef HMAC_CTX isc_hmacmd5_t;
#else
typedef struct {
isc_md5_t md5ctx;
unsigned char key[ISC_HMACMD5_KEYLENGTH];
} isc_hmacmd5_t;
#endif
ISC_LANG_BEGINDECLS
void
isc_hmacmd5_init(isc_hmacmd5_t *ctx, const unsigned char *key,
unsigned int len);
void
isc_hmacmd5_invalidate(isc_hmacmd5_t *ctx);
void
isc_hmacmd5_update(isc_hmacmd5_t *ctx, const unsigned char *buf,
unsigned int len);
void
isc_hmacmd5_sign(isc_hmacmd5_t *ctx, unsigned char *digest);
isc_boolean_t
isc_hmacmd5_verify(isc_hmacmd5_t *ctx, unsigned char *digest);
isc_boolean_t
isc_hmacmd5_verify2(isc_hmacmd5_t *ctx, unsigned char *digest, size_t len);
ISC_LANG_ENDDECLS
#endif /* ISC_HMACMD5_H */
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