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Diffstat (limited to 'contrib/bind9/lib/dns/ds.c')
| -rw-r--r-- | contrib/bind9/lib/dns/ds.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/contrib/bind9/lib/dns/ds.c b/contrib/bind9/lib/dns/ds.c new file mode 100644 index 000000000000..80e1503f1528 --- /dev/null +++ b/contrib/bind9/lib/dns/ds.c @@ -0,0 +1,160 @@ +/* + * Copyright (C) 2004-2007, 2010 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2002, 2003 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: ds.c,v 1.13 2010-12-23 23:47:08 tbox Exp $ */ + +/*! \file */ + +#include <config.h> + +#include <string.h> + +#include <isc/buffer.h> +#include <isc/region.h> +#include <isc/sha1.h> +#include <isc/sha2.h> +#include <isc/util.h> + +#include <dns/ds.h> +#include <dns/fixedname.h> +#include <dns/name.h> +#include <dns/rdata.h> +#include <dns/rdatastruct.h> +#include <dns/result.h> + +#include <dst/dst.h> + +#ifdef HAVE_OPENSSL_GOST +#include <dst/result.h> +#include <openssl/evp.h> + +extern const EVP_MD * EVP_gost(void); +#endif + +isc_result_t +dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key, + unsigned int digest_type, unsigned char *buffer, + dns_rdata_t *rdata) +{ + dns_fixedname_t fname; + dns_name_t *name; + unsigned char digest[ISC_SHA256_DIGESTLENGTH]; + isc_region_t r; + isc_buffer_t b; + dns_rdata_ds_t ds; + isc_sha1_t sha1; + isc_sha256_t sha256; +#ifdef HAVE_OPENSSL_GOST + EVP_MD_CTX ctx; + const EVP_MD *md; +#endif + + REQUIRE(key != NULL); + REQUIRE(key->type == dns_rdatatype_dnskey); + + if (!dns_ds_digest_supported(digest_type)) + return (ISC_R_NOTIMPLEMENTED); + + dns_fixedname_init(&fname); + name = dns_fixedname_name(&fname); + (void)dns_name_downcase(owner, name, NULL); + + memset(buffer, 0, DNS_DS_BUFFERSIZE); + isc_buffer_init(&b, buffer, DNS_DS_BUFFERSIZE); + + switch (digest_type) { + case DNS_DSDIGEST_SHA1: + isc_sha1_init(&sha1); + dns_name_toregion(name, &r); + isc_sha1_update(&sha1, r.base, r.length); + dns_rdata_toregion(key, &r); + INSIST(r.length >= 4); + isc_sha1_update(&sha1, r.base, r.length); + isc_sha1_final(&sha1, digest); + break; +#ifdef HAVE_OPENSSL_GOST +#define CHECK(x) \ + if ((x) != 1) { \ + EVP_MD_CTX_cleanup(&ctx); \ + return (DST_R_OPENSSLFAILURE); \ + } + + case DNS_DSDIGEST_GOST: + md = EVP_gost(); + if (md == NULL) + return (DST_R_OPENSSLFAILURE); + EVP_MD_CTX_init(&ctx); + CHECK(EVP_DigestInit(&ctx, md)); + dns_name_toregion(name, &r); + CHECK(EVP_DigestUpdate(&ctx, + (const void *) r.base, + (size_t) r.length)); + dns_rdata_toregion(key, &r); + INSIST(r.length >= 4); + CHECK(EVP_DigestUpdate(&ctx, + (const void *) r.base, + (size_t) r.length)); + CHECK(EVP_DigestFinal(&ctx, digest, NULL)); + break; +#endif + default: + isc_sha256_init(&sha256); + dns_name_toregion(name, &r); + isc_sha256_update(&sha256, r.base, r.length); + dns_rdata_toregion(key, &r); + INSIST(r.length >= 4); + isc_sha256_update(&sha256, r.base, r.length); + isc_sha256_final(digest, &sha256); + break; + } + + ds.mctx = NULL; + ds.common.rdclass = key->rdclass; + ds.common.rdtype = dns_rdatatype_ds; + ds.algorithm = r.base[3]; + ds.key_tag = dst_region_computeid(&r, ds.algorithm); + ds.digest_type = digest_type; + switch (digest_type) { + case DNS_DSDIGEST_SHA1: + ds.length = ISC_SHA1_DIGESTLENGTH; + break; +#ifdef HAVE_OPENSSL_GOST + case DNS_DSDIGEST_GOST: + ds.length = ISC_GOST_DIGESTLENGTH; + break; +#endif + default: + ds.length = ISC_SHA256_DIGESTLENGTH; + break; + } + ds.digest = digest; + + return (dns_rdata_fromstruct(rdata, key->rdclass, dns_rdatatype_ds, + &ds, &b)); +} + +isc_boolean_t +dns_ds_digest_supported(unsigned int digest_type) { +#ifdef HAVE_OPENSSL_GOST + return (ISC_TF(digest_type == DNS_DSDIGEST_SHA1 || + digest_type == DNS_DSDIGEST_SHA256 || + digest_type == DNS_DSDIGEST_GOST)); +#else + return (ISC_TF(digest_type == DNS_DSDIGEST_SHA1 || + digest_type == DNS_DSDIGEST_SHA256)); +#endif +} |