contrib/bind/lib/dns/key.c

   1 /*
   2  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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: key.c,v 1.8 2007/06/19 23:47:16 tbox Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24
  25 #include <isc/region.h>
  26 #include <isc/util.h>
  27
  28 #include <dns/keyvalues.h>
  29
  30 #include <dst/dst.h>
  31
  32 #include "dst_internal.h"
  33
  34 isc_uint16_t
  35 dst_region_computeid(const isc_region_t *source, unsigned int alg) {
  36         isc_uint32_t ac;
  37         const unsigned char *p;
  38         int size;
  39
  40         REQUIRE(source != NULL);
  41         REQUIRE(source->length >= 4);
  42
  43         p = source->base;
  44         size = source->length;
  45
  46         if (alg == DST_ALG_RSAMD5)
  47                 return ((p[size - 3] << 8) + p[size - 2]);
  48
  49         for (ac = 0; size > 1; size -= 2, p += 2)
  50                 ac += ((*p) << 8) + *(p + 1);
  51
  52         if (size > 0)
  53                 ac += ((*p) << 8);
  54         ac += (ac >> 16) & 0xffff;
  55
  56         return ((isc_uint16_t)(ac & 0xffff));
  57 }
  58
  59 dns_name_t *
  60 dst_key_name(const dst_key_t *key) {
  61         REQUIRE(VALID_KEY(key));
  62         return (key->key_name);
  63 }
  64
  65 unsigned int
  66 dst_key_size(const dst_key_t *key) {
  67         REQUIRE(VALID_KEY(key));
  68         return (key->key_size);
  69 }
  70
  71 unsigned int
  72 dst_key_proto(const dst_key_t *key) {
  73         REQUIRE(VALID_KEY(key));
  74         return (key->key_proto);
  75 }
  76
  77 unsigned int
  78 dst_key_alg(const dst_key_t *key) {
  79         REQUIRE(VALID_KEY(key));
  80         return (key->key_alg);
  81 }
  82
  83 isc_uint32_t
  84 dst_key_flags(const dst_key_t *key) {
  85         REQUIRE(VALID_KEY(key));
  86         return (key->key_flags);
  87 }
  88
  89 dns_keytag_t
  90 dst_key_id(const dst_key_t *key) {
  91         REQUIRE(VALID_KEY(key));
  92         return (key->key_id);
  93 }
  94
  95 dns_rdataclass_t
  96 dst_key_class(const dst_key_t *key) {
  97         REQUIRE(VALID_KEY(key));
  98         return (key->key_class);
  99 }
 100
 101 isc_boolean_t
 102 dst_key_iszonekey(const dst_key_t *key) {
 103         REQUIRE(VALID_KEY(key));
 104
 105         if ((key->key_flags & DNS_KEYTYPE_NOAUTH) != 0)
 106                 return (ISC_FALSE);
 107         if ((key->key_flags & DNS_KEYFLAG_OWNERMASK) != DNS_KEYOWNER_ZONE)
 108                 return (ISC_FALSE);
 109         if (key->key_proto != DNS_KEYPROTO_DNSSEC &&
 110             key->key_proto != DNS_KEYPROTO_ANY)
 111                 return (ISC_FALSE);
 112         return (ISC_TRUE);
 113 }
 114
 115 isc_boolean_t
 116 dst_key_isnullkey(const dst_key_t *key) {
 117         REQUIRE(VALID_KEY(key));
 118
 119         if ((key->key_flags & DNS_KEYFLAG_TYPEMASK) != DNS_KEYTYPE_NOKEY)
 120                 return (ISC_FALSE);
 121         if ((key->key_flags & DNS_KEYFLAG_OWNERMASK) != DNS_KEYOWNER_ZONE)
 122                 return (ISC_FALSE);
 123         if (key->key_proto != DNS_KEYPROTO_DNSSEC &&
 124             key->key_proto != DNS_KEYPROTO_ANY)
 125                 return (ISC_FALSE);
 126         return (ISC_TRUE);
 127 }
 128
 129 void
 130 dst_key_setbits(dst_key_t *key, isc_uint16_t bits) {
 131         unsigned int maxbits;
 132         REQUIRE(VALID_KEY(key));
 133         if (bits != 0) {
 134                 RUNTIME_CHECK(dst_key_sigsize(key, &maxbits) == ISC_R_SUCCESS);
 135                 maxbits *= 8;
 136                 REQUIRE(bits <= maxbits);
 137         }
 138         key->key_bits = bits;
 139 }
 140
 141 isc_uint16_t
 142 dst_key_getbits(const dst_key_t *key) {
 143         REQUIRE(VALID_KEY(key));
 144         return (key->key_bits);
 145 }
 146
 147 /*! \file */