1 /* 2 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 14 * PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 /* $Id: key.c,v 1.8 2020/02/25 05:00:42 jsg Exp $ */ 18 19 #include <stddef.h> 20 #include <stdint.h> 21 22 #include <isc/region.h> 23 #include <isc/util.h> 24 25 #include <dst/dst.h> 26 27 #include "dst_internal.h" 28 29 uint16_t 30 dst_region_computeid(const isc_region_t *source, unsigned int alg) { 31 uint32_t ac; 32 const unsigned char *p; 33 int size; 34 35 REQUIRE(source != NULL); 36 REQUIRE(source->length >= 4); 37 38 p = source->base; 39 size = source->length; 40 41 if (alg == DST_ALG_RSAMD5) 42 return ((p[size - 3] << 8) + p[size - 2]); 43 44 for (ac = 0; size > 1; size -= 2, p += 2) 45 ac += ((*p) << 8) + *(p + 1); 46 47 if (size > 0) 48 ac += ((*p) << 8); 49 ac += (ac >> 16) & 0xffff; 50 51 return ((uint16_t)(ac & 0xffff)); 52 } 53 54 unsigned int 55 dst_key_size(const dst_key_t *key) { 56 return (key->key_size); 57 } 58 59 unsigned int 60 dst_key_alg(const dst_key_t *key) { 61 return (key->key_alg); 62 } 63 64 void 65 dst_key_setbits(dst_key_t *key, uint16_t bits) { 66 unsigned int maxbits; 67 if (bits != 0) { 68 RUNTIME_CHECK(dst_key_sigsize(key, &maxbits) == ISC_R_SUCCESS); 69 maxbits *= 8; 70 REQUIRE(bits <= maxbits); 71 } 72 key->key_bits = bits; 73 } 74 75 uint16_t 76 dst_key_getbits(const dst_key_t *key) { 77 return (key->key_bits); 78 } 79 80 /*! \file */ 81