contrib/bind-9.3/lib/dns/ds.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2002, 2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: ds.c,v 1.4.2.1 2004/03/08 02:07:53 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <string.h>
  23
  24 #include <isc/buffer.h>
  25 #include <isc/region.h>
  26 #include <isc/sha1.h>
  27 #include <isc/util.h>
  28
  29 #include <dns/ds.h>
  30 #include <dns/fixedname.h>
  31 #include <dns/name.h>
  32 #include <dns/rdata.h>
  33 #include <dns/rdatastruct.h>
  34 #include <dns/result.h>
  35
  36 #include <dst/dst.h>
  37
  38 isc_result_t
  39 dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key,
  40                   unsigned int digest_type, unsigned char *buffer,
  41                   dns_rdata_t *rdata)
  42 {
  43         isc_sha1_t sha1;
  44         dns_fixedname_t fname;
  45         dns_name_t *name;
  46         unsigned char digest[ISC_SHA1_DIGESTLENGTH];
  47         isc_region_t r;
  48         isc_buffer_t b;
  49         dns_rdata_ds_t ds;
  50
  51         REQUIRE(key != NULL);
  52         REQUIRE(key->type == dns_rdatatype_dnskey);
  53
  54         if (digest_type != DNS_DSDIGEST_SHA1)
  55                 return (ISC_R_NOTIMPLEMENTED);
  56
  57         dns_fixedname_init(&fname);
  58         name = dns_fixedname_name(&fname);
  59         (void)dns_name_downcase(owner, name, NULL);
  60
  61         memset(buffer, 0, DNS_DS_BUFFERSIZE);
  62         isc_buffer_init(&b, buffer, DNS_DS_BUFFERSIZE);
  63
  64         isc_sha1_init(&sha1);
  65         dns_name_toregion(name, &r);
  66         isc_sha1_update(&sha1, r.base, r.length);
  67         dns_rdata_toregion(key, &r);
  68         INSIST(r.length >= 4);
  69         isc_sha1_update(&sha1, r.base, r.length);
  70         isc_sha1_final(&sha1, digest);
  71
  72         ds.mctx = NULL;
  73         ds.common.rdclass = key->rdclass;
  74         ds.common.rdtype = dns_rdatatype_ds;
  75         ds.algorithm = r.base[3];
  76         ds.key_tag = dst_region_computeid(&r, ds.algorithm);
  77         ds.digest_type = DNS_DSDIGEST_SHA1;
  78         ds.length = ISC_SHA1_DIGESTLENGTH;
  79         ds.digest = digest;
  80
  81         return (dns_rdata_fromstruct(rdata, key->rdclass, dns_rdatatype_ds,
  82                                      &ds, &b));
  83 }