_ Git - dnssec-prover/blob - src/validation.rs

   1 //! Utilities to deserialize and validate RFC 9102 proofs
   2
   3 use alloc::vec::Vec;
   4 use alloc::vec;
   5 use core::cmp;
   6
   7 use ring::signature;
   8
   9 use crate::rr::*;
  10 use crate::ser::write_name;
  11
  12 /// Gets the trusted root anchors
  13 ///
  14 /// These are available at <https://data.iana.org/root-anchors/root-anchors.xml>
  15 pub fn root_hints() -> Vec<DS> {
  16         #[allow(unused_mut)]
  17         let mut res = vec![DS {
  18                 name: ".".try_into().unwrap(), key_tag: 19036, alg: 8, digest_type: 2,
  19                 digest: hex_lit::hex!("49AAC11D7B6F6446702E54A1607371607A1A41855200FD2CE1CDDE32F24E8FB5").to_vec(),
  20         }, DS {
  21                 name: ".".try_into().unwrap(), key_tag: 20326, alg: 8, digest_type: 2,
  22                 digest: hex_lit::hex!("E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D").to_vec(),
  23         }];
  24         // In tests, add the trust anchor from RFC 9102
  25         #[cfg(test)]
  26         res.push(DS {
  27                 name: ".".try_into().unwrap(), key_tag: 47005, alg: 13, digest_type: 2,
  28                 digest: hex_lit::hex!("2eb6e9f2480126691594d649a5a613de3052e37861634641bb568746f2ffc4d4").to_vec(),
  29         });
  30         res
  31 }
  32
  33 #[derive(Debug, PartialEq)]
  34 /// An error when validating DNSSEC signatures or other data
  35 pub enum ValidationError {
  36         /// An algorithm used in signing was not supported.
  37         ///
  38         /// In general DNS usage the resulting data should be used anyway, as we were able to verify
  39         /// that a zone wished to use the unsupported algorithm.
  40         ///
  41         /// However, in cases where signing is mandatory, this can be treated as an error.
  42         UnsupportedAlgorithm,
  43         /// The provided data was invalid or signatures did not validate.
  44         Invalid,
  45 }
  46
  47 pub(crate) fn bytes_to_rsa_pk<'a>(pubkey: &'a [u8])
  48 -> Result<signature::RsaPublicKeyComponents<&'a [u8]>, ()> {
  49         if pubkey.len() <= 3 { return Err(()); }
  50
  51         let mut pos = 0;
  52         let exponent_length;
  53         if pubkey[0] == 0 {
  54                 exponent_length = ((pubkey[1] as usize) << 8) | (pubkey[2] as usize);
  55                 pos += 3;
  56         } else {
  57                 exponent_length = pubkey[0] as usize;
  58                 pos += 1;
  59         }
  60
  61         if pubkey.len() <= pos + exponent_length { return Err(()); }
  62         Ok(signature::RsaPublicKeyComponents {
  63                 n: &pubkey[pos + exponent_length..],
  64                 e: &pubkey[pos..pos + exponent_length]
  65         })
  66 }
  67
  68 fn verify_rrsig<'a, RR: Record, Keys>(sig: &RRSig, dnskeys: Keys, mut records: Vec<&RR>)
  69 -> Result<(), ValidationError>
  70 where Keys: IntoIterator<Item = &'a DnsKey> {
  71         for record in records.iter() {
  72                 if sig.ty != record.ty() { return Err(ValidationError::Invalid); }
  73         }
  74         for dnskey in dnskeys.into_iter() {
  75                 if dnskey.key_tag() == sig.key_tag {
  76                         // Protocol must be 3, otherwise its not DNSSEC
  77                         if dnskey.protocol != 3 { continue; }
  78                         // The ZONE flag must be set if we're going to validate RRs with this key.
  79                         if dnskey.flags & 0b1_0000_0000 == 0 { continue; }
  80                         if dnskey.alg != sig.alg { continue; }
  81
  82                         let mut signed_data = Vec::with_capacity(2048);
  83                         signed_data.extend_from_slice(&sig.ty.to_be_bytes());
  84                         signed_data.extend_from_slice(&sig.alg.to_be_bytes());
  85                         signed_data.extend_from_slice(&sig.labels.to_be_bytes());
  86                         signed_data.extend_from_slice(&sig.orig_ttl.to_be_bytes());
  87                         signed_data.extend_from_slice(&sig.expiration.to_be_bytes());
  88                         signed_data.extend_from_slice(&sig.inception.to_be_bytes());
  89                         signed_data.extend_from_slice(&sig.key_tag.to_be_bytes());
  90                         write_name(&mut signed_data, &sig.key_name);
  91
  92                         records.sort();
  93
  94                         for record in records.iter() {
  95                                 let periods = record.name().as_str().chars().filter(|c| *c == '.').count();
  96                                 let labels = sig.labels.into();
  97                                 if periods != 1 && periods != labels {
  98                                         if periods < labels { return Err(ValidationError::Invalid); }
  99                                         let signed_name = record.name().as_str().splitn(periods - labels + 1, ".").last();
 100                                         debug_assert!(signed_name.is_some());
 101                                         if let Some(name) = signed_name {
 102                                                 signed_data.extend_from_slice(b"\x01*");
 103                                                 write_name(&mut signed_data, name);
 104                                         } else { return Err(ValidationError::Invalid); }
 105                                 } else {
 106                                         write_name(&mut signed_data, record.name());
 107                                 }
 108                                 signed_data.extend_from_slice(&record.ty().to_be_bytes());
 109                                 signed_data.extend_from_slice(&1u16.to_be_bytes()); // The INternet class
 110                                 signed_data.extend_from_slice(&sig.orig_ttl.to_be_bytes());
 111                                 record.write_u16_len_prefixed_data(&mut signed_data);
 112                         }
 113
 114                         match sig.alg {
 115                                 8|10 => {
 116                                         let alg = if sig.alg == 8 {
 117                                                 &signature::RSA_PKCS1_1024_8192_SHA256_FOR_LEGACY_USE_ONLY
 118                                         } else {
 119                                                 &signature::RSA_PKCS1_1024_8192_SHA512_FOR_LEGACY_USE_ONLY
 120                                         };
 121                                         bytes_to_rsa_pk(&dnskey.pubkey).map_err(|_| ValidationError::Invalid)?
 122                                                 .verify(alg, &signed_data, &sig.signature)
 123                                                 .map_err(|_| ValidationError::Invalid)?;
 124                                 },
 125                                 13|14 => {
 126                                         let alg = if sig.alg == 13 {
 127                                                 &signature::ECDSA_P256_SHA256_FIXED
 128                                         } else {
 129                                                 &signature::ECDSA_P384_SHA384_FIXED
 130                                         };
 131
 132                                         // Add 0x4 identifier to the ECDSA pubkey as expected by ring.
 133                                         let mut key = Vec::with_capacity(dnskey.pubkey.len() + 1);
 134                                         key.push(0x4);
 135                                         key.extend_from_slice(&dnskey.pubkey);
 136
 137                                         signature::UnparsedPublicKey::new(alg, &key)
 138                                                 .verify(&signed_data, &sig.signature)
 139                                                 .map_err(|_| ValidationError::Invalid)?;
 140                                 },
 141                                 15 => {
 142                                         signature::UnparsedPublicKey::new(&signature::ED25519, &dnskey.pubkey)
 143                                                 .verify(&signed_data, &sig.signature)
 144                                                 .map_err(|_| ValidationError::Invalid)?;
 145                                 },
 146                                 _ => return Err(ValidationError::UnsupportedAlgorithm),
 147                         }
 148
 149                         return Ok(());
 150                 }
 151         }
 152         Err(ValidationError::Invalid)
 153 }
 154
 155 fn verify_dnskey_rrsig<'a, T, I>(sig: &RRSig, dses: T, records: Vec<&DnsKey>)
 156 -> Result<(), ValidationError>
 157 where T: IntoIterator<IntoIter = I>, I: Iterator<Item = &'a DS> + Clone {
 158         let mut validated_dnskeys = Vec::with_capacity(records.len());
 159         let dses = dses.into_iter();
 160
 161         let mut had_known_digest_type = false;
 162         let mut had_ds = false;
 163         for ds in dses.clone() {
 164                 had_ds = true;
 165                 if ds.digest_type == 1 || ds.digest_type == 2 || ds.digest_type == 4 {
 166                         had_known_digest_type = true;
 167                         break;
 168                 }
 169         }
 170         if !had_ds { return Err(ValidationError::Invalid); }
 171         if !had_known_digest_type { return Err(ValidationError::UnsupportedAlgorithm); }
 172
 173         for dnskey in records.iter() {
 174                 // Only use SHA1 DS records if we don't have any SHA256/SHA384 DS RRs.
 175                 let trust_sha1 = dses.clone().all(|ds| ds.digest_type != 2 && ds.digest_type != 4);
 176                 for ds in dses.clone() {
 177                         if ds.alg != dnskey.alg { continue; }
 178                         if dnskey.key_tag() == ds.key_tag {
 179                                 let alg = match ds.digest_type {
 180                                         1 if trust_sha1 => &ring::digest::SHA1_FOR_LEGACY_USE_ONLY,
 181                                         2 => &ring::digest::SHA256,
 182                                         4 => &ring::digest::SHA384,
 183                                         _ => continue,
 184                                 };
 185                                 let mut ctx = ring::digest::Context::new(alg);
 186                                 write_name(&mut ctx, &dnskey.name);
 187                                 ctx.update(&dnskey.flags.to_be_bytes());
 188                                 ctx.update(&dnskey.protocol.to_be_bytes());
 189                                 ctx.update(&dnskey.alg.to_be_bytes());
 190                                 ctx.update(&dnskey.pubkey);
 191                                 let hash = ctx.finish();
 192                                 if hash.as_ref() == &ds.digest {
 193                                         validated_dnskeys.push(*dnskey);
 194                                         break;
 195                                 }
 196                         }
 197                 }
 198         }
 199         verify_rrsig(sig, validated_dnskeys.iter().map(|k| *k), records)
 200 }
 201
 202 /// Given a set of [`RR`]s, [`verify_rr_stream`] checks what it can and returns the set of
 203 /// non-[`RRSig`]/[`DnsKey`]/[`DS`] records which it was able to verify using this struct.
 204 ///
 205 /// It also contains signing and expiry times, which must be validated before considering the
 206 /// contained records verified.
 207 #[derive(Debug, Clone)]
 208 pub struct VerifiedRRStream<'a> {
 209         /// The set of verified [`RR`]s.
 210         ///
 211         /// These are not valid unless the current UNIX time is between [`Self::valid_from`] and
 212         /// [`Self::expiration`].
 213         pub verified_rrs: Vec<&'a RR>,
 214         /// The latest [`RRSig::inception`] of all the [`RRSig`]s validated to verify
 215         /// [`Self::verified_rrs`].
 216         ///
 217         /// Any records in [`Self::verified_rrs`] should not be considered valid unless this is before
 218         /// the current UNIX time.
 219         ///
 220         /// While the field here is a u64, the algorithm used to identify rollovers will fail in 2133.
 221         pub valid_from: u64,
 222         /// The earliest [`RRSig::expiration`] of all the [`RRSig`]s validated to verify
 223         /// [`Self::verified_rrs`].
 224         ///
 225         /// Any records in [`Self::verified_rrs`] should not be considered valid unless this is after
 226         /// the current UNIX time.
 227         ///
 228         /// While the field here is a u64, the algorithm used to identify rollovers will fail in 2133.
 229         pub expires: u64,
 230         /// The minimum [`RRSig::orig_ttl`] of all the [`RRSig`]s validated to verify
 231         /// [`Self::verified_rrs`].
 232         ///
 233         /// Any caching of [`Self::verified_rrs`] must not last longer than this value, in seconds.
 234         pub max_cache_ttl: u32,
 235 }
 236
 237 fn resolve_time(time: u32) -> u64 {
 238         // RFC 2065 was published in January 1997, so we arbitrarily use that as a cutoff and assume
 239         // any timestamps before then are actually past 2106 instead.
 240         // We ignore leap years for simplicity.
 241         if time < 60*60*24*365*27 {
 242                 (time as u64) + (u32::MAX as u64)
 243         } else {
 244                 time.into()
 245         }
 246 }
 247
 248 /// Verifies the given set of resource records.
 249 ///
 250 /// Given a set of arbitrary records, this attempts to validate DNSSEC data from the [`root_hints`]
 251 /// through to any supported non-DNSSEC record types.
 252 ///
 253 /// All records which could be validated are returned, though if an error is found validating any
 254 /// contained record, only `Err` will be returned.
 255 ///
 256 /// You MUST check that the current UNIX time is between [`VerifiedRRStream::latest_inception`] and
 257 /// [`VerifiedRRStream::earliest_expiry`].
 258 pub fn verify_rr_stream<'a>(inp: &'a [RR]) -> Result<VerifiedRRStream<'a>, ValidationError> {
 259         let mut zone = ".";
 260         let mut res = Vec::new();
 261         let mut pending_ds_sets = Vec::with_capacity(1);
 262         let mut latest_inception = 0;
 263         let mut earliest_expiry = u64::MAX;
 264         let mut min_ttl = u32::MAX;
 265         'next_zone: while zone == "." || !pending_ds_sets.is_empty() {
 266                 let mut found_unsupported_alg = false;
 267                 let next_ds_set;
 268                 if let Some((next_zone, ds_set)) = pending_ds_sets.pop() {
 269                         next_ds_set = Some(ds_set);
 270                         zone = next_zone;
 271                 } else {
 272                         debug_assert_eq!(zone, ".");
 273                         next_ds_set = None;
 274                 }
 275
 276                 for rrsig in inp.iter()
 277                         .filter_map(|rr| if let RR::RRSig(sig) = rr { Some(sig) } else { None })
 278                         .filter(|rrsig| rrsig.name.as_str() == zone && rrsig.ty == DnsKey::TYPE)
 279                 {
 280                         let dnskeys = inp.iter()
 281                                 .filter_map(|rr| if let RR::DnsKey(dnskey) = rr { Some(dnskey) } else { None })
 282                                 .filter(move |dnskey| dnskey.name.as_str() == zone);
 283                         let dnskeys_verified = if zone == "." {
 284                                 verify_dnskey_rrsig(rrsig, &root_hints(), dnskeys.clone().collect())
 285                         } else {
 286                                 debug_assert!(next_ds_set.is_some());
 287                                 if next_ds_set.is_none() { break 'next_zone; }
 288                                 verify_dnskey_rrsig(rrsig, next_ds_set.clone().unwrap(), dnskeys.clone().collect())
 289                         };
 290                         if dnskeys_verified.is_ok() {
 291                                 latest_inception = cmp::max(latest_inception, resolve_time(rrsig.inception));
 292                                 earliest_expiry = cmp::min(earliest_expiry, resolve_time(rrsig.expiration));
 293                                 min_ttl = cmp::min(min_ttl, rrsig.orig_ttl);
 294                                 for rrsig in inp.iter()
 295                                         .filter_map(|rr| if let RR::RRSig(sig) = rr { Some(sig) } else { None })
 296                                         .filter(move |rrsig| rrsig.key_name.as_str() == zone && rrsig.ty != DnsKey::TYPE)
 297                                 {
 298                                         if !rrsig.name.ends_with(zone) { return Err(ValidationError::Invalid); }
 299                                         let signed_records = inp.iter()
 300                                                 .filter(|rr| rr.name() == &rrsig.name && rr.ty() == rrsig.ty);
 301                                         verify_rrsig(rrsig, dnskeys.clone(), signed_records.clone().collect())?;
 302                                         latest_inception = cmp::max(latest_inception, resolve_time(rrsig.inception));
 303                                         earliest_expiry = cmp::min(earliest_expiry, resolve_time(rrsig.expiration));
 304                                         min_ttl = cmp::min(min_ttl, rrsig.orig_ttl);
 305                                         match rrsig.ty {
 306                                                 // RRSigs shouldn't cover child `DnsKey`s or other `RRSig`s
 307                                                 RRSig::TYPE|DnsKey::TYPE => return Err(ValidationError::Invalid),
 308                                                 DS::TYPE => {
 309                                                         if !pending_ds_sets.iter().any(|(pending_zone, _)| pending_zone == &rrsig.name.as_str()) {
 310                                                                 pending_ds_sets.push((
 311                                                                         &rrsig.name,
 312                                                                         signed_records.filter_map(|rr|
 313                                                                                 if let RR::DS(ds) = rr { Some(ds) }
 314                                                                                 else { debug_assert!(false, "We already filtered by type"); None })
 315                                                                 ));
 316                                                         }
 317                                                 },
 318                                                 _ => {
 319                                                         for record in signed_records {
 320                                                                 if !res.contains(&record) { res.push(record); }
 321                                                         }
 322                                                 },
 323                                         }
 324                                 }
 325                                 continue 'next_zone;
 326                         } else if dnskeys_verified == Err(ValidationError::UnsupportedAlgorithm) {
 327                                 // There may be redundant signatures by different keys, where one we don't supprt
 328                                 // and another we do. Ignore ones we don't support, but if there are no more,
 329                                 // return UnsupportedAlgorithm
 330                                 found_unsupported_alg = true;
 331                         } else {
 332                                 // We don't explicitly handle invalid signatures here, instead we move on to the
 333                                 // next RRSig (if there is one) and return `Invalid` if no `RRSig`s match.
 334                         }
 335                 }
 336                 // No RRSigs were able to verify our DnsKey set
 337                 if found_unsupported_alg {
 338                         return Err(ValidationError::UnsupportedAlgorithm);
 339                 } else {
 340                         return Err(ValidationError::Invalid);
 341                 }
 342         }
 343         if res.is_empty() { Err(ValidationError::Invalid) }
 344         else if latest_inception >= earliest_expiry { Err(ValidationError::Invalid) }
 345         else {
 346                 Ok(VerifiedRRStream {
 347                         verified_rrs: res, valid_from: latest_inception, expires: earliest_expiry,
 348                         max_cache_ttl: min_ttl,
 349                 })
 350         }
 351 }
 352
 353 impl<'a> VerifiedRRStream<'a> {
 354         /// Given a name, resolve any [`CName`] records and return any verified records which were
 355         /// pointed to by the original name.
 356         ///
 357         /// Note that because of [`CName`]s, the [`RR::name`] in the returned records may or may not be
 358         /// equal to `name`.
 359         ///
 360         /// You MUST still check that the current UNIX time is between
 361         /// [`VerifiedRRStream::valid_from`] and [`VerifiedRRStream::expires`] before
 362         /// using any records returned here.
 363         pub fn resolve_name<'b>(&self, mut name: &'b Name) -> Vec<&'a RR> where 'a: 'b {
 364                 loop {
 365                         let mut cname_search = self.verified_rrs.iter()
 366                                 .filter(|rr| rr.name() == name)
 367                                 .filter_map(|rr| if let RR::CName(cn) = rr { Some(cn) } else { None });
 368                         if let Some(cname) = cname_search.next() {
 369                                 name = &cname.canonical_name;
 370                         }
 371                         return self.verified_rrs.iter().filter(|rr| rr.name() == name).map(|rr| *rr).collect();
 372                 }
 373         }
 374 }
 375
 376 #[cfg(test)]
 377 mod tests {
 378         #![allow(deprecated)]
 379
 380         use super::*;
 381
 382         use alloc::borrow::ToOwned;
 383
 384         use crate::ser::{parse_rr_stream, write_rr};
 385
 386         use hex_conservative::FromHex;
 387         use rand::seq::SliceRandom;
 388
 389         fn root_dnskey() -> (Vec<DnsKey>, Vec<RR>) {
 390                 let dnskeys = vec![DnsKey {
 391                         name: ".".try_into().unwrap(), flags: 256, protocol: 3, alg: 8,
 392                         pubkey: base64::decode("AwEAAentCcIEndLh2QSK+pHFq/PkKCwioxt75d7qNOUuTPMo0Fcte/NbwDPbocvbZ/eNb5RV/xQdapaJASQ/oDLsqzD0H1+JkHNuuKc2JLtpMxg4glSE4CnRXT2CnFTW5IwOREL+zeqZHy68OXy5ngW5KALbevRYRg/q2qFezRtCSQ0knmyPwgFsghVYLKwi116oxwEU5yZ6W7npWMxt5Z+Qs8diPNWrS5aXLgJtrWUGIIuFfuZwXYziGRP/z3o1EfMo9zZU19KLopkoLXX7Ls/diCXdSEdJXTtFA8w0/OKQviuJebfKscoElCTswukVZ1VX5gbaFEo2xWhHJ9Uo63wYaTk=").unwrap(),
 393                 }, DnsKey {
 394                         name: ".".try_into().unwrap(), flags: 257, protocol: 3, alg: 8,
 395                         pubkey: base64::decode("AwEAAaz/tAm8yTn4Mfeh5eyI96WSVexTBAvkMgJzkKTOiW1vkIbzxeF3+/4RgWOq7HrxRixHlFlExOLAJr5emLvN7SWXgnLh4+B5xQlNVz8Og8kvArMtNROxVQuCaSnIDdD5LKyWbRd2n9WGe2R8PzgCmr3EgVLrjyBxWezF0jLHwVN8efS3rCj/EWgvIWgb9tarpVUDK/b58Da+sqqls3eNbuv7pr+eoZG+SrDK6nWeL3c6H5Apxz7LjVc1uTIdsIXxuOLYA4/ilBmSVIzuDWfdRUfhHdY6+cn8HFRm+2hM8AnXGXws9555KrUB5qihylGa8subX2Nn6UwNR1AkUTV74bU=").unwrap(),
 396                 }];
 397                 let dnskey_rrsig = RRSig {
 398                         name: ".".try_into().unwrap(), ty: DnsKey::TYPE, alg: 8, labels: 0, orig_ttl: 172800,
 399                         expiration: 1708473600, inception: 1706659200, key_tag: 20326, key_name: ".".try_into().unwrap(),
 400                         signature: base64::decode("ZO8LbjtwAiVkkBzOnGbiI/3ilGUPmmJpagsLSBVbIZRG6o/8a+hUZpIPTvk5ERZ1rAW4x0YxKAU8qtaHQpKIp3qYA6u97DYytVD7RdtXKHmGYAvR6QbD5eVTkCw1Sz705rJxbwt6+YM5OBweSUAy5Glo6JSQPDQwRDwj/bV2fLRhJbvfsBgxqaXJA0SaE/ceyvK8gB2NIaguTJNrztr2TENrHxi86OKOuHYDHthOW0TFoPfr19qj/P2eEC6dYniTVovUwHT7e+Hqrb05dJF4mI4ZjaIb5mFf8i5RehT1aRlnb3CLiwJ01bEjrRBo3xUn5I3PkCnglHhx3EvkO73OzA==").unwrap(),
 401                 };
 402                 let root_hints = root_hints();
 403                 verify_dnskey_rrsig(&dnskey_rrsig, &root_hints, dnskeys.iter().collect()).unwrap();
 404                 let rrs = vec![dnskeys[0].clone().into(), dnskeys[1].clone().into(), dnskey_rrsig.into()];
 405                 (dnskeys, rrs)
 406         }
 407
 408         fn com_dnskey() -> (Vec<DnsKey>, Vec<RR>) {
 409                 let root_dnskeys = root_dnskey().0;
 410                 let mut com_ds = vec![DS {
 411                         name: "com.".try_into().unwrap(), key_tag: 19718, alg: 13, digest_type: 2,
 412                         digest: Vec::from_hex("8ACBB0CD28F41250A80A491389424D341522D946B0DA0C0291F2D3D771D7805A").unwrap(),
 413                 }];
 414                 let ds_rrsig = RRSig {
 415                         name: "com.".try_into().unwrap(), ty: DS::TYPE, alg: 8, labels: 1, orig_ttl: 86400,
 416                         expiration: 1708189200, inception: 1707062400, key_tag: 30903, key_name: ".".try_into().unwrap(),
 417                         signature: base64::decode("vwMOBBwqRBdlmGZB+0FKfyMSignEtpYW9sD4TzPW2E+wdbF7O7epR5cmKmvcv0RUJdM0dGC/QmhCfgf/yqw1Xp7TpmPaYzaruW70hjGXZJO2nY3G6stUVe4S7lM2CzHL7nbbpaB5B+iSu6Ua9dZ+nyKrxfB7855HBLCLrHrkMGxWQiEPTallXXS8tEM1Y2XrsuzAQu2vZ2D2ClhFspFbPwwOdw+G6+NsZ8PnIfTkCj6DuKcgbdxjmGaYmw/6hVt9OU3kGCOBaJaEy4LrD8Kwzfu4S7axMwTKP4y4c5Y/E4k/mVAW0cuUtv549HaDfD2V0CvW1bDl6PqRkOiVsqM/lA==").unwrap(),
 418                 };
 419                 verify_rrsig(&ds_rrsig, &root_dnskeys, com_ds.iter().collect()).unwrap();
 420                 let dnskeys = vec![DnsKey {
 421                         name: "com.".try_into().unwrap(), flags: 256, protocol: 3, alg: 13,
 422                         pubkey: base64::decode("5i9qjJgyH+9MBz7VO269/srLQB/xRRllyUoVq8oLBZshPe4CGzDSFGnXAM3L/QPzB9ULpJuuy7jcxmBZ5Ebo7A==").unwrap(),
 423                 }, DnsKey {
 424                         name: "com.".try_into().unwrap(), flags: 257, protocol: 3, alg: 13,
 425                         pubkey: base64::decode("tx8EZRAd2+K/DJRV0S+hbBzaRPS/G6JVNBitHzqpsGlz8huE61Ms9ANe6NSDLKJtiTBqfTJWDAywEp1FCsEINQ==").unwrap(),
 426                 }];
 427                 let dnskey_rrsig = RRSig {
 428                         name: "com.".try_into().unwrap(), ty: DnsKey::TYPE, alg: 13, labels: 1, orig_ttl: 86400,
 429                         expiration: 1707750155, inception: 1706453855, key_tag: 19718, key_name: "com.".try_into().unwrap(),
 430                         signature: base64::decode("ZFGChM7QfJt0QSqVWerWnG5pMjpL1pXyJAmuHe8dHI/olmaNCxm+mqNHv9i3AploFY6JoNtiHmeBiC6zuFj/ZQ==").unwrap(),
 431                 };
 432                 verify_dnskey_rrsig(&dnskey_rrsig, &com_ds, dnskeys.iter().collect()).unwrap();
 433                 let rrs = vec![com_ds.pop().unwrap().into(), ds_rrsig.into(),
 434                         dnskeys[0].clone().into(), dnskeys[1].clone().into(), dnskey_rrsig.into()];
 435                 (dnskeys, rrs)
 436         }
 437
 438         fn mattcorallo_dnskey() -> (Vec<DnsKey>, Vec<RR>) {
 439                 let com_dnskeys = com_dnskey().0;
 440                 let mut mattcorallo_ds = vec![DS {
 441                         name: "mattcorallo.com.".try_into().unwrap(), key_tag: 25630, alg: 13, digest_type: 2,
 442                         digest: Vec::from_hex("DC608CA62BE89B3B9DB1593F9A59930D24FBA79D486E19C88A7792711EC00735").unwrap(),
 443                 }];
 444                 let ds_rrsig = RRSig {
 445                         name: "mattcorallo.com.".try_into().unwrap(), ty: DS::TYPE, alg: 13, labels: 2, orig_ttl: 86400,
 446                         expiration: 1707631252, inception: 1707022252, key_tag: 4534, key_name: "com.".try_into().unwrap(),
 447                         signature: base64::decode("M7Fk+CjfLz6hRsY5iSuw5bwc2OqlS3XtKH8FDs7lcbhEiR63n+DzOF0I8L+3k06SXFnE89uuofQECzWmAyef6Q==").unwrap(),
 448                 };
 449                 verify_rrsig(&ds_rrsig, &com_dnskeys, mattcorallo_ds.iter().collect()).unwrap();
 450                 let dnskeys = vec![DnsKey {
 451                         name: "mattcorallo.com.".try_into().unwrap(), flags: 257, protocol: 3, alg: 13,
 452                         pubkey: base64::decode("8BP51Etiu4V6cHvGCYqwNqCip4pvHChjEgkgG4zpdDvO9YRcTGuV/p71hAUut2/qEdxqXfUOT/082BJ/Z089DA==").unwrap(),
 453                 }, DnsKey {
 454                         name: "mattcorallo.com.".try_into().unwrap(), flags: 256, protocol: 3, alg: 13,
 455                         pubkey: base64::decode("AhUlQ8qk7413R0m4zKfTDHb/FQRlKag+ncGXxNxT+qTzSZTb9E5IGjo9VCEp6+IMqqpkd4GrXpN9AzDvlcU9Ig==").unwrap(),
 456                 }];
 457                 let dnskey_rrsig = RRSig {
 458                         name: "mattcorallo.com.".try_into().unwrap(), ty: DnsKey::TYPE, alg: 13, labels: 2, orig_ttl: 604800,
 459                         expiration: 1708278650, inception: 1707063650, key_tag: 25630, key_name: "mattcorallo.com.".try_into().unwrap(),
 460                         signature: base64::decode("nyVDwG+la8d5dyWgB7m+H3BQwCvTWLQ/kAqNruMzdLmn9B3VC9u/rvM/ortEu0WPbA1FZWJbRKpF1Ohkj3ltNw==").unwrap(),
 461                 };
 462                 verify_dnskey_rrsig(&dnskey_rrsig, &mattcorallo_ds, dnskeys.iter().collect()).unwrap();
 463                 let rrs = vec![mattcorallo_ds.pop().unwrap().into(), ds_rrsig.into(),
 464                         dnskeys[0].clone().into(), dnskeys[1].clone().into(), dnskey_rrsig.into()];
 465                 (dnskeys, rrs)
 466         }
 467
 468         fn mattcorallo_txt_record() -> (Txt, RRSig) {
 469                 let txt_resp = Txt {
 470                         name: "matt.user._bitcoin-payment.mattcorallo.com.".try_into().unwrap(),
 471                         data: "bitcoin:?b12=lno1qsgqmqvgm96frzdg8m0gc6nzeqffvzsqzrxqy32afmr3jn9ggkwg3egfwch2hy0l6jut6vfd8vpsc3h89l6u3dm4q2d6nuamav3w27xvdmv3lpgklhg7l5teypqz9l53hj7zvuaenh34xqsz2sa967yzqkylfu9xtcd5ymcmfp32h083e805y7jfd236w9afhavqqvl8uyma7x77yun4ehe9pnhu2gekjguexmxpqjcr2j822xr7q34p078gzslf9wpwz5y57alxu99s0z2ql0kfqvwhzycqq45ehh58xnfpuek80hw6spvwrvttjrrq9pphh0dpydh06qqspp5uq4gpyt6n9mwexde44qv7lstzzq60nr40ff38u27un6y53aypmx0p4qruk2tf9mjwqlhxak4znvna5y".to_owned().into_bytes(),
 472                 };
 473                 let txt_rrsig = RRSig {
 474                         name: "matt.user._bitcoin-payment.mattcorallo.com.".try_into().unwrap(),
 475                         ty: Txt::TYPE, alg: 13, labels: 5, orig_ttl: 3600, expiration: 1708123318,
 476                         inception: 1706908318, key_tag: 47959, key_name: "mattcorallo.com.".try_into().unwrap(),
 477                         signature: base64::decode("mgU6iwyMWO0w9nj2Gmt1+RmaIJIU3KO7DWVZiCD1bmU9e9zNefXCtnWOC2HtwjUsn/QYkWluvuSfYpBrt1IjpQ==").unwrap(),
 478                 };
 479                 (txt_resp, txt_rrsig)
 480         }
 481
 482         fn matcorallo_dnskey() -> (Vec<DnsKey>, Vec<RR>) {
 483                 let com_dnskeys = com_dnskey().0;
 484                 let mut matcorallo_ds = vec![DS {
 485                         name: "matcorallo.com.".try_into().unwrap(), key_tag: 24930, alg: 13, digest_type: 2,
 486                         digest: Vec::from_hex("693E990CBB1CE1095E387092D3C04BCE907C008891F32A88D41D3ECB129E5E23").unwrap(),
 487                 }];
 488                 let ds_rrsig = RRSig {
 489                         name: "matcorallo.com.".try_into().unwrap(), ty: DS::TYPE, alg: 13, labels: 2, orig_ttl: 86400,
 490                         expiration: 1707628636, inception: 1707019636, key_tag: 4534, key_name: "com.".try_into().unwrap(),
 491                         signature: base64::decode("l9b+DhtnJSIzR6y4Bwx+0L9kep77UNCBoTg74RTSL6oMrQd8w4OobHxzwDyXqnLfyxVP18V+AnQp4DdJ2nUW1g==").unwrap(),
 492                 };
 493                 verify_rrsig(&ds_rrsig, &com_dnskeys, matcorallo_ds.iter().collect()).unwrap();
 494                 let dnskeys = vec![DnsKey {
 495                         name: "matcorallo.com.".try_into().unwrap(), flags: 257, protocol: 3, alg: 13,
 496                         pubkey: base64::decode("pfO3ow3SrKhLS7AMEi3b5W9P28nCOB9vryxfSXhqMcXFP1x9V4xAt0/JLr0zNodsqRD/8d9Yhu4Wf3hnSlaavw==").unwrap(),
 497                 }, DnsKey {
 498                         name: "matcorallo.com.".try_into().unwrap(), flags: 256, protocol: 3, alg: 13,
 499                         pubkey: base64::decode("OO6LQTV1mnRsFgn6YQoyeo/SDqS3eajfVv8WGQVnuSYO/bTS9St1tJiox2fgU6wRWDU3chhjz1Pj0unKUAQKig==").unwrap(),
 500                 }];
 501                 let dnskey_rrsig = RRSig {
 502                         name: "matcorallo.com.".try_into().unwrap(), ty: DnsKey::TYPE, alg: 13, labels: 2, orig_ttl: 604800,
 503                         expiration: 1708309135, inception: 1707094135, key_tag: 24930, key_name: "matcorallo.com.".try_into().unwrap(),
 504                         signature: base64::decode("2MKg3bTn9zf4ThwCoKRFadqD6l1D6SuLksRieKxFC0QQnzUOCRgZSK2/IlT0DMEoM0+mGrJZo7UG79UILMGUyg==").unwrap(),
 505                 };
 506                 verify_dnskey_rrsig(&dnskey_rrsig, &matcorallo_ds, dnskeys.iter().collect()).unwrap();
 507                 let rrs = vec![matcorallo_ds.pop().unwrap().into(), ds_rrsig.into(),
 508                         dnskeys[0].clone().into(), dnskeys[1].clone().into(), dnskey_rrsig.into()];
 509                 (dnskeys, rrs)
 510         }
 511
 512         fn matcorallo_txt_record() -> (Txt, RRSig) {
 513                 let txt_resp = Txt {
 514                         name: "txt_test.matcorallo.com.".try_into().unwrap(),
 515                         data: "dnssec_prover_test".to_owned().into_bytes(),
 516                 };
 517                 let txt_rrsig = RRSig {
 518                         name: "txt_test.matcorallo.com.".try_into().unwrap(),
 519                         ty: Txt::TYPE, alg: 13, labels: 3, orig_ttl: 30, expiration: 1708319203,
 520                         inception: 1707104203, key_tag: 34530, key_name: "matcorallo.com.".try_into().unwrap(),
 521                         signature: base64::decode("4vaE5Jex2VvIT39JpuMNT7Ds7O0OfzTik5f8WcRRxO0IJnGAO16syAsNUkNkNqsMYknnjHDF0lI4agszgzdpsw==").unwrap(),
 522                 };
 523                 (txt_resp, txt_rrsig)
 524         }
 525
 526         fn matcorallo_cname_record() -> (CName, RRSig) {
 527                 let cname_resp = CName {
 528                         name: "cname_test.matcorallo.com.".try_into().unwrap(),
 529                         canonical_name: "txt_test.matcorallo.com.".try_into().unwrap(),
 530                 };
 531                 let cname_rrsig = RRSig {
 532                         name: "cname_test.matcorallo.com.".try_into().unwrap(),
 533                         ty: CName::TYPE, alg: 13, labels: 3, orig_ttl: 30, expiration: 1708319203,
 534                         inception: 1707104203, key_tag: 34530, key_name: "matcorallo.com.".try_into().unwrap(),
 535                         signature: base64::decode("5HIrmEotbVb95umE6SX3NrPboKsthdcY8b7DdaYQZzm0Nj5m2VgcfOmEPJYS8o1xE4GvGGF4sdfSy3Uw7TibBg==").unwrap(),
 536                 };
 537                 (cname_resp, cname_rrsig)
 538         }
 539
 540         fn matcorallo_wildcard_record() -> (Txt, RRSig) {
 541                 let txt_resp = Txt {
 542                         name: "test.wildcard_test.matcorallo.com.".try_into().unwrap(),
 543                         data: "wildcard_test".to_owned().into_bytes(),
 544                 };
 545                 let txt_rrsig = RRSig {
 546                         name: "test.wildcard_test.matcorallo.com.".try_into().unwrap(),
 547                         ty: Txt::TYPE, alg: 13, labels: 3, orig_ttl: 30, expiration: 1708321778,
 548                         inception: 1707106778, key_tag: 34530, key_name: "matcorallo.com.".try_into().unwrap(),
 549                         signature: base64::decode("vdnXunPY4CnbW/BL8VOOR9o33+dqyKA/4h+u5VM7NjB30Shp8L8gL5UwE0k7TKRNgHC8j3TqEPEmNMIHz87Z4Q==").unwrap(),
 550                 };
 551                 (txt_resp, txt_rrsig)
 552         }
 553
 554         fn matcorallo_cname_wildcard_record() -> (CName, RRSig, Txt, RRSig) {
 555                 let cname_resp = CName {
 556                         name: "test.cname_wildcard_test.matcorallo.com.".try_into().unwrap(),
 557                         canonical_name: "cname.wildcard_test.matcorallo.com.".try_into().unwrap(),
 558                 };
 559                 let txt_resp = Txt {
 560                         name: "cname.wildcard_test.matcorallo.com.".try_into().unwrap(),
 561                         data: "wildcard_test".to_owned().into_bytes(),
 562                 };
 563                 let cname_rrsig = RRSig {
 564                         name: "test.cname_wildcard_test.matcorallo.com.".try_into().unwrap(),
 565                         ty: CName::TYPE, alg: 13, labels: 3, orig_ttl: 30, expiration: 1708322050,
 566                         inception: 1707107050, key_tag: 34530, key_name: "matcorallo.com.".try_into().unwrap(),
 567                         signature: base64::decode("JfJuSemF5dtQYxEw6eKL4IRP8BaDt6FtbtdpZ6HjODTDflhKQRhBEbwT7kwceKPAq18q5sWHFV1bMTqE/F3WLw==").unwrap(),
 568                 };
 569                 let txt_rrsig = RRSig {
 570                         name: "cname.wildcard_test.matcorallo.com.".try_into().unwrap(),
 571                         ty: Txt::TYPE, alg: 13, labels: 3, orig_ttl: 30, expiration: 1708321778,
 572                         inception: 1707106778, key_tag: 34530, key_name: "matcorallo.com.".try_into().unwrap(),
 573                         signature: base64::decode("vdnXunPY4CnbW/BL8VOOR9o33+dqyKA/4h+u5VM7NjB30Shp8L8gL5UwE0k7TKRNgHC8j3TqEPEmNMIHz87Z4Q==").unwrap(),
 574                 };
 575                 (cname_resp, cname_rrsig, txt_resp, txt_rrsig)
 576         }
 577
 578         fn matcorallo_txt_sort_edge_cases_records() -> (Vec<Txt>, RRSig) {
 579                 let txts = vec![Txt {
 580                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 581                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab".to_owned().into_bytes(),
 582                 }, Txt {
 583                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 584                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".to_owned().into_bytes(),
 585                 }, Txt {
 586                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 587                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabaa".to_owned().into_bytes(),
 588                 }, Txt {
 589                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 590                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaba".to_owned().into_bytes(),
 591                 }, Txt {
 592                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 593                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".to_owned().into_bytes(),
 594                 }, Txt {
 595                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 596                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab".to_owned().into_bytes(),
 597                 }, Txt {
 598                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 599                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".to_owned().into_bytes(),
 600                 }, Txt {
 601                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 602                         data: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaba".to_owned().into_bytes(),
 603                 }];
 604                 let rrsig = RRSig {
 605                         name: "txt_sort_order.matcorallo.com.".try_into().unwrap(),
 606                         ty: Txt::TYPE, alg: 13, labels: 3, orig_ttl: 30, expiration: 1708449632,
 607                         inception: 1707234632, key_tag: 34530, key_name: "matcorallo.com.".try_into().unwrap(),
 608                         signature: base64::decode("elAhELwzkGpUMvzeiYZpg1+yRFPjmOeEd1ir1vYx2Dku9kzsXmAlejOYDPWdaJ6ekvHdMejCN/MtyI+iFAYqsw==").unwrap(),
 609                 };
 610                 (txts, rrsig)
 611         }
 612
 613         #[test]
 614         fn check_txt_record_a() {
 615                 let dnskeys = mattcorallo_dnskey().0;
 616                 let (txt, txt_rrsig) = mattcorallo_txt_record();
 617                 let txt_resp = [txt];
 618                 verify_rrsig(&txt_rrsig, &dnskeys, txt_resp.iter().collect()).unwrap();
 619         }
 620
 621         #[test]
 622         fn check_single_txt_proof() {
 623                 let mut rr_stream = Vec::new();
 624                 for rr in root_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 625                 for rr in com_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 626                 for rr in mattcorallo_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 627                 let (txt, txt_rrsig) = mattcorallo_txt_record();
 628                 for rr in [RR::Txt(txt), RR::RRSig(txt_rrsig)] { write_rr(&rr, 1, &mut rr_stream); }
 629
 630                 let mut rrs = parse_rr_stream(&rr_stream).unwrap();
 631                 rrs.shuffle(&mut rand::rngs::OsRng);
 632                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 633                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 634                 if let RR::Txt(txt) = &verified_rrs.verified_rrs[0] {
 635                         assert_eq!(txt.name.as_str(), "matt.user._bitcoin-payment.mattcorallo.com.");
 636                         assert_eq!(txt.data, b"bitcoin:?b12=lno1qsgqmqvgm96frzdg8m0gc6nzeqffvzsqzrxqy32afmr3jn9ggkwg3egfwch2hy0l6jut6vfd8vpsc3h89l6u3dm4q2d6nuamav3w27xvdmv3lpgklhg7l5teypqz9l53hj7zvuaenh34xqsz2sa967yzqkylfu9xtcd5ymcmfp32h083e805y7jfd236w9afhavqqvl8uyma7x77yun4ehe9pnhu2gekjguexmxpqjcr2j822xr7q34p078gzslf9wpwz5y57alxu99s0z2ql0kfqvwhzycqq45ehh58xnfpuek80hw6spvwrvttjrrq9pphh0dpydh06qqspp5uq4gpyt6n9mwexde44qv7lstzzq60nr40ff38u27un6y53aypmx0p4qruk2tf9mjwqlhxak4znvna5y");
 637                 } else { panic!(); }
 638                 assert_eq!(verified_rrs.valid_from, 1707063650); // The TXT record RRSig was created last
 639                 assert_eq!(verified_rrs.expires, 1707631252); // The mattcorallo.com DS RRSig expires first
 640                 assert_eq!(verified_rrs.max_cache_ttl, 3600); // The TXT record had the shortest TTL
 641         }
 642
 643         #[test]
 644         fn check_txt_record_b() {
 645                 let dnskeys = matcorallo_dnskey().0;
 646                 let (txt, txt_rrsig) = matcorallo_txt_record();
 647                 let txt_resp = [txt];
 648                 verify_rrsig(&txt_rrsig, &dnskeys, txt_resp.iter().collect()).unwrap();
 649         }
 650
 651         #[test]
 652         fn check_cname_record() {
 653                 let dnskeys = matcorallo_dnskey().0;
 654                 let (cname, cname_rrsig) = matcorallo_cname_record();
 655                 let cname_resp = [cname];
 656                 verify_rrsig(&cname_rrsig, &dnskeys, cname_resp.iter().collect()).unwrap();
 657         }
 658
 659         #[test]
 660         fn check_multi_zone_proof() {
 661                 let mut rr_stream = Vec::new();
 662                 for rr in root_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 663                 for rr in com_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 664                 for rr in mattcorallo_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 665                 let (txt, txt_rrsig) = mattcorallo_txt_record();
 666                 for rr in [RR::Txt(txt), RR::RRSig(txt_rrsig)] { write_rr(&rr, 1, &mut rr_stream); }
 667                 for rr in matcorallo_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 668                 let (txt, txt_rrsig) = matcorallo_txt_record();
 669                 for rr in [RR::Txt(txt), RR::RRSig(txt_rrsig)] { write_rr(&rr, 1, &mut rr_stream); }
 670                 let (cname, cname_rrsig) = matcorallo_cname_record();
 671                 for rr in [RR::CName(cname), RR::RRSig(cname_rrsig)] { write_rr(&rr, 1, &mut rr_stream); }
 672
 673                 let mut rrs = parse_rr_stream(&rr_stream).unwrap();
 674                 rrs.shuffle(&mut rand::rngs::OsRng);
 675                 let mut verified_rrs = verify_rr_stream(&rrs).unwrap();
 676                 verified_rrs.verified_rrs.sort();
 677                 assert_eq!(verified_rrs.verified_rrs.len(), 3);
 678                 if let RR::Txt(txt) = &verified_rrs.verified_rrs[0] {
 679                         assert_eq!(txt.name.as_str(), "matt.user._bitcoin-payment.mattcorallo.com.");
 680                         assert_eq!(txt.data, b"bitcoin:?b12=lno1qsgqmqvgm96frzdg8m0gc6nzeqffvzsqzrxqy32afmr3jn9ggkwg3egfwch2hy0l6jut6vfd8vpsc3h89l6u3dm4q2d6nuamav3w27xvdmv3lpgklhg7l5teypqz9l53hj7zvuaenh34xqsz2sa967yzqkylfu9xtcd5ymcmfp32h083e805y7jfd236w9afhavqqvl8uyma7x77yun4ehe9pnhu2gekjguexmxpqjcr2j822xr7q34p078gzslf9wpwz5y57alxu99s0z2ql0kfqvwhzycqq45ehh58xnfpuek80hw6spvwrvttjrrq9pphh0dpydh06qqspp5uq4gpyt6n9mwexde44qv7lstzzq60nr40ff38u27un6y53aypmx0p4qruk2tf9mjwqlhxak4znvna5y");
 681                 } else { panic!(); }
 682                 if let RR::Txt(txt) = &verified_rrs.verified_rrs[1] {
 683                         assert_eq!(txt.name.as_str(), "txt_test.matcorallo.com.");
 684                         assert_eq!(txt.data, b"dnssec_prover_test");
 685                 } else { panic!(); }
 686                 if let RR::CName(cname) = &verified_rrs.verified_rrs[2] {
 687                         assert_eq!(cname.name.as_str(), "cname_test.matcorallo.com.");
 688                         assert_eq!(cname.canonical_name.as_str(), "txt_test.matcorallo.com.");
 689                 } else { panic!(); }
 690
 691                 let filtered_rrs =
 692                         verified_rrs.resolve_name(&"cname_test.matcorallo.com.".try_into().unwrap());
 693                 assert_eq!(filtered_rrs.len(), 1);
 694                 if let RR::Txt(txt) = &filtered_rrs[0] {
 695                         assert_eq!(txt.name.as_str(), "txt_test.matcorallo.com.");
 696                         assert_eq!(txt.data, b"dnssec_prover_test");
 697                 } else { panic!(); }
 698         }
 699
 700         #[test]
 701         fn check_wildcard_record() {
 702                 let dnskeys = matcorallo_dnskey().0;
 703                 let (txt, txt_rrsig) = matcorallo_wildcard_record();
 704                 let txt_resp = [txt];
 705                 verify_rrsig(&txt_rrsig, &dnskeys, txt_resp.iter().collect()).unwrap();
 706         }
 707
 708         #[test]
 709         fn check_wildcard_proof() {
 710                 let mut rr_stream = Vec::new();
 711                 for rr in root_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 712                 for rr in com_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 713                 for rr in matcorallo_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 714                 let (cname, cname_rrsig, txt, txt_rrsig) = matcorallo_cname_wildcard_record();
 715                 for rr in [RR::CName(cname), RR::RRSig(cname_rrsig)] { write_rr(&rr, 1, &mut rr_stream); }
 716                 for rr in [RR::Txt(txt), RR::RRSig(txt_rrsig)] { write_rr(&rr, 1, &mut rr_stream); }
 717
 718                 let mut rrs = parse_rr_stream(&rr_stream).unwrap();
 719                 rrs.shuffle(&mut rand::rngs::OsRng);
 720                 let mut verified_rrs = verify_rr_stream(&rrs).unwrap();
 721                 verified_rrs.verified_rrs.sort();
 722                 assert_eq!(verified_rrs.verified_rrs.len(), 2);
 723                 if let RR::Txt(txt) = &verified_rrs.verified_rrs[0] {
 724                         assert_eq!(txt.name.as_str(), "cname.wildcard_test.matcorallo.com.");
 725                         assert_eq!(txt.data, b"wildcard_test");
 726                 } else { panic!(); }
 727                 if let RR::CName(cname) = &verified_rrs.verified_rrs[1] {
 728                         assert_eq!(cname.name.as_str(), "test.cname_wildcard_test.matcorallo.com.");
 729                         assert_eq!(cname.canonical_name.as_str(), "cname.wildcard_test.matcorallo.com.");
 730                 } else { panic!(); }
 731
 732                 let filtered_rrs =
 733                         verified_rrs.resolve_name(&"test.cname_wildcard_test.matcorallo.com.".try_into().unwrap());
 734                 assert_eq!(filtered_rrs.len(), 1);
 735                 if let RR::Txt(txt) = &filtered_rrs[0] {
 736                         assert_eq!(txt.name.as_str(), "cname.wildcard_test.matcorallo.com.");
 737                         assert_eq!(txt.data, b"wildcard_test");
 738                 } else { panic!(); }
 739         }
 740
 741         #[test]
 742         fn check_txt_sort_order() {
 743                 let mut rr_stream = Vec::new();
 744                 for rr in root_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 745                 for rr in com_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 746                 for rr in matcorallo_dnskey().1 { write_rr(&rr, 1, &mut rr_stream); }
 747                 let (mut txts, rrsig) = matcorallo_txt_sort_edge_cases_records();
 748                 write_rr(&rrsig, 1, &mut rr_stream);
 749                 for txt in txts.iter() { write_rr(txt, 1, &mut rr_stream); }
 750
 751                 let mut rrs = parse_rr_stream(&rr_stream).unwrap();
 752                 rrs.shuffle(&mut rand::rngs::OsRng);
 753                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 754                 let mut verified_txts = verified_rrs.verified_rrs
 755                         .iter().map(|rr| if let RR::Txt(txt) = rr { txt.clone() } else { panic!(); })
 756                         .collect::<Vec<_>>();
 757                 verified_txts.sort();
 758                 txts.sort();
 759                 assert_eq!(verified_txts, txts);
 760         }
 761
 762         #[test]
 763         fn rfc9102_parse_test() {
 764                 // Note that this is the `AuthenticationChain` field only, and ignores the
 765                 // `ExtSupportLifetime` field (stripping the top two 0 bytes from the front).
 766 let rfc9102_test_vector = Vec::from_hex("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").unwrap();
 767
 768                 let mut rrs = parse_rr_stream(&rfc9102_test_vector).unwrap();
 769                 rrs.shuffle(&mut rand::rngs::OsRng);
 770                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 771                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 772                 if let RR::TLSA(tlsa) = &verified_rrs.verified_rrs[0] {
 773                         assert_eq!(tlsa.cert_usage, 3);
 774                         assert_eq!(tlsa.selector, 1);
 775                         assert_eq!(tlsa.data_ty, 1);
 776                         assert_eq!(tlsa.data, Vec::from_hex("8bd1da95272f7fa4ffb24137fc0ed03aae67e5c4d8b3c50734e1050a7920b922").unwrap());
 777                 } else { panic!(); }
 778         }
 779 }