_ Git - rust-lightning/blob - src/ln/peer_channel_encryptor.rs

   1 use ln::msgs::HandleError;
   2 use ln::msgs;
   3
   4 use secp256k1::Secp256k1;
   5 use secp256k1::key::{PublicKey,SecretKey};
   6 use secp256k1::ecdh::SharedSecret;
   7
   8 use rand::{thread_rng,Rng};
   9
  10 use crypto::digest::Digest;
  11 use crypto::hkdf::{hkdf_extract,hkdf_expand};
  12 use crypto::sha2::Sha256;
  13
  14 use crypto::aead::{AeadEncryptor, AeadDecryptor};
  15
  16 use util::chacha20poly1305rfc::ChaCha20Poly1305RFC;
  17 use util::byte_utils;
  18
  19 // Sha256("Noise_XK_secp256k1_ChaChaPoly_SHA256")
  20 const NOISE_CK: [u8; 32] = [0x26, 0x40, 0xf5, 0x2e, 0xeb, 0xcd, 0x9e, 0x88, 0x29, 0x58, 0x95, 0x1c, 0x79, 0x42, 0x50, 0xee, 0xdb, 0x28, 0x00, 0x2c, 0x05, 0xd7, 0xdc, 0x2e, 0xa0, 0xf1, 0x95, 0x40, 0x60, 0x42, 0xca, 0xf1];
  21 // Sha256(NOISE_CK || "lightning")
  22 const NOISE_H: [u8; 32] = [0xd1, 0xfb, 0xf6, 0xde, 0xe4, 0xf6, 0x86, 0xf1, 0x32, 0xfd, 0x70, 0x2c, 0x4a, 0xbf, 0x8f, 0xba, 0x4b, 0xb4, 0x20, 0xd8, 0x9d, 0x2a, 0x04, 0x8a, 0x3c, 0x4f, 0x4c, 0x09, 0x2e, 0x37, 0xb6, 0x76];
  23
  24 pub enum NextNoiseStep {
  25         ActOne,
  26         ActTwo,
  27         ActThree,
  28         NoiseComplete,
  29 }
  30
  31 #[derive(PartialEq)]
  32 enum NoiseStep {
  33         PreActOne,
  34         PostActOne,
  35         PostActTwo,
  36         // When done swap noise_state for NoiseState::Finished
  37 }
  38
  39 struct BidirectionalNoiseState {
  40         h: [u8; 32],
  41         ck: [u8; 32],
  42 }
  43 enum DirectionalNoiseState {
  44         Outbound {
  45                 ie: SecretKey,
  46         },
  47         Inbound {
  48                 ie: Option<PublicKey>, // filled in if state >= PostActOne
  49                 re: Option<SecretKey>, // filled in if state >= PostActTwo
  50                 temp_k2: Option<[u8; 32]>, // filled in if state >= PostActTwo
  51         }
  52 }
  53 enum NoiseState {
  54         InProgress {
  55                 state: NoiseStep,
  56                 directional_state: DirectionalNoiseState,
  57                 bidirectional_state: BidirectionalNoiseState,
  58         },
  59         Finished {
  60                 sk: [u8; 32],
  61                 sn: u64,
  62                 sck: [u8; 32],
  63                 rk: [u8; 32],
  64                 rn: u64,
  65                 rck: [u8; 32],
  66         }
  67 }
  68
  69 pub struct PeerChannelEncryptor {
  70         secp_ctx: Secp256k1,
  71         their_node_id: Option<PublicKey>, // filled in for outbound, or inbound after noise_state is Finished
  72
  73         noise_state: NoiseState,
  74 }
  75
  76 impl PeerChannelEncryptor {
  77         pub fn new_outbound(their_node_id: PublicKey) -> PeerChannelEncryptor {
  78                 let mut rng = thread_rng();
  79                 let mut key = [0u8; 32];
  80                 rng.fill_bytes(&mut key);
  81
  82                 let secp_ctx = Secp256k1::new();
  83                 let sec_key = SecretKey::from_slice(&secp_ctx, &key).unwrap(); //TODO: nicer rng-is-bad error message
  84
  85                 let mut sha = Sha256::new();
  86                 sha.input(&NOISE_H);
  87                 sha.input(&their_node_id.serialize()[..]);
  88                 let mut h = [0; 32];
  89                 sha.result(&mut h);
  90
  91                 PeerChannelEncryptor {
  92                         their_node_id: Some(their_node_id),
  93                         secp_ctx: secp_ctx,
  94                         noise_state: NoiseState::InProgress {
  95                                 state: NoiseStep::PreActOne,
  96                                 directional_state: DirectionalNoiseState::Outbound {
  97                                         ie: sec_key,
  98                                 },
  99                                 bidirectional_state: BidirectionalNoiseState {
 100                                         h: h,
 101                                         ck: NOISE_CK,
 102                                 },
 103                         }
 104                 }
 105         }
 106
 107         pub fn new_inbound(our_node_secret: &SecretKey) -> PeerChannelEncryptor {
 108                 let secp_ctx = Secp256k1::new();
 109
 110                 let mut sha = Sha256::new();
 111                 sha.input(&NOISE_H);
 112                 let our_node_id = PublicKey::from_secret_key(&secp_ctx, our_node_secret).unwrap(); //TODO: nicer bad-node_secret error message
 113                 sha.input(&our_node_id.serialize()[..]);
 114                 let mut h = [0; 32];
 115                 sha.result(&mut h);
 116
 117                 PeerChannelEncryptor {
 118                         their_node_id: None,
 119                         secp_ctx: secp_ctx,
 120                         noise_state: NoiseState::InProgress {
 121                                 state: NoiseStep::PreActOne,
 122                                 directional_state: DirectionalNoiseState::Inbound {
 123                                         ie: None,
 124                                         re: None,
 125                                         temp_k2: None,
 126                                 },
 127                                 bidirectional_state: BidirectionalNoiseState {
 128                                         h: h,
 129                                         ck: NOISE_CK,
 130                                 },
 131                         }
 132                 }
 133         }
 134
 135         #[inline]
 136         fn encrypt_with_ad(res: &mut[u8], n: u64, key: &[u8; 32], h: &[u8], plaintext: &[u8]) {
 137                 let mut nonce = [0; 12];
 138                 nonce[4..].copy_from_slice(&byte_utils::le64_to_array(n));
 139
 140                 let mut chacha = ChaCha20Poly1305RFC::new(key, &nonce, h);
 141                 let mut tag = [0; 16];
 142                 chacha.encrypt(plaintext, &mut res[0..plaintext.len()], &mut tag);
 143                 res[plaintext.len()..].copy_from_slice(&tag);
 144         }
 145
 146         #[inline]
 147         fn decrypt_with_ad(res: &mut[u8], n: u64, key: &[u8; 32], h: &[u8], cyphertext: &[u8]) -> Result<(), HandleError> {
 148                 let mut nonce = [0; 12];
 149                 nonce[4..].copy_from_slice(&byte_utils::le64_to_array(n));
 150
 151                 let mut chacha = ChaCha20Poly1305RFC::new(key, &nonce, h);
 152                 if !chacha.decrypt(&cyphertext[0..cyphertext.len() - 16], res, &cyphertext[cyphertext.len() - 16..]) {
 153                         return Err(HandleError{err: "Bad MAC", msg: Some(msgs::ErrorMessage::DisconnectPeer{})});
 154                 }
 155                 Ok(())
 156         }
 157
 158         #[inline]
 159         fn hkdf(state: &mut BidirectionalNoiseState, ss: SharedSecret) -> [u8; 32] {
 160                 let sha = Sha256::new();
 161                 let mut hkdf = [0; 64];
 162                 {
 163                         let mut prk = [0; 32];
 164                         hkdf_extract(sha, &state.ck, &ss[..], &mut prk);
 165                         hkdf_expand(sha, &prk, &[0;0], &mut hkdf);
 166                 }
 167                 state.ck.copy_from_slice(&hkdf[0..32]);
 168                 let mut res = [0; 32];
 169                 res.copy_from_slice(&hkdf[32..]);
 170                 res
 171         }
 172
 173         #[inline]
 174         fn outbound_noise_act(secp_ctx: &Secp256k1, state: &mut BidirectionalNoiseState, our_key: &SecretKey, their_key: &PublicKey) -> ([u8; 50], [u8; 32]) {
 175                 let our_pub = PublicKey::from_secret_key(secp_ctx, &our_key).unwrap(); //TODO: nicer rng-is-bad error message
 176
 177                 let mut sha = Sha256::new();
 178                 sha.input(&state.h);
 179                 sha.input(&our_pub.serialize()[..]);
 180                 sha.result(&mut state.h);
 181
 182                 let ss = SharedSecret::new(secp_ctx, &their_key, &our_key);
 183                 let temp_k = PeerChannelEncryptor::hkdf(state, ss);
 184
 185                 let mut res = [0; 50];
 186                 res[1..34].copy_from_slice(&our_pub.serialize()[..]);
 187                 PeerChannelEncryptor::encrypt_with_ad(&mut res[34..], 0, &temp_k, &state.h, &[0; 0]);
 188
 189                 sha.reset();
 190                 sha.input(&state.h);
 191                 sha.input(&res[34..]);
 192                 sha.result(&mut state.h);
 193
 194                 (res, temp_k)
 195         }
 196
 197         #[inline]
 198         fn inbound_noise_act(secp_ctx: &Secp256k1, state: &mut BidirectionalNoiseState, act: &[u8], our_key: &SecretKey) -> Result<(PublicKey, [u8; 32]), HandleError> {
 199                 assert_eq!(act.len(), 50);
 200
 201                 if act[0] != 0 {
 202                         return Err(HandleError{err: "Unknown handshake version number", msg: Some(msgs::ErrorMessage::DisconnectPeer{})});
 203                 }
 204
 205                 let their_pub = match PublicKey::from_slice(secp_ctx, &act[1..34]) {
 206                         Err(_) => return Err(HandleError{err: "Invalid public key", msg: Some(msgs::ErrorMessage::DisconnectPeer{})}),
 207                         Ok(key) => key,
 208                 };
 209
 210                 let mut sha = Sha256::new();
 211                 sha.input(&state.h);
 212                 sha.input(&their_pub.serialize()[..]);
 213                 sha.result(&mut state.h);
 214
 215                 let ss = SharedSecret::new(secp_ctx, &their_pub, &our_key);
 216                 let temp_k = PeerChannelEncryptor::hkdf(state, ss);
 217
 218                 let mut dec = [0; 0];
 219                 try!(PeerChannelEncryptor::decrypt_with_ad(&mut dec, 0, &temp_k, &state.h, &act[34..]));
 220
 221                 sha.reset();
 222                 sha.input(&state.h);
 223                 sha.input(&act[34..]);
 224                 sha.result(&mut state.h);
 225
 226                 Ok((their_pub, temp_k))
 227         }
 228
 229         pub fn get_act_one(&mut self) -> [u8; 50] {
 230                 match self.noise_state {
 231                         NoiseState::InProgress { ref mut state, ref directional_state, ref mut bidirectional_state } =>
 232                                 match directional_state {
 233                                         &DirectionalNoiseState::Outbound { ref ie } => {
 234                                                 if *state != NoiseStep::PreActOne {
 235                                                         panic!("Requested act at wrong step");
 236                                                 }
 237
 238                                                 let (res, _) = PeerChannelEncryptor::outbound_noise_act(&self.secp_ctx, bidirectional_state, &ie, &self.their_node_id.unwrap());
 239                                                 *state = NoiseStep::PostActOne;
 240                                                 res
 241                                         },
 242                                         _ => panic!("Wrong direction for act"),
 243                                 },
 244                         _ => panic!("Cannot get act one after noise handshake completes"),
 245                 }
 246         }
 247
 248         // Separated for testing:
 249         fn process_act_one_with_ephemeral_key(&mut self, act_one: &[u8], our_node_secret: &SecretKey, our_ephemeral: SecretKey) -> Result<[u8; 50], HandleError> {
 250                 assert_eq!(act_one.len(), 50);
 251
 252                 match self.noise_state {
 253                         NoiseState::InProgress { ref mut state, ref mut directional_state, ref mut bidirectional_state } =>
 254                                 match directional_state {
 255                                         &mut DirectionalNoiseState::Inbound { ref mut ie, ref mut re, ref mut temp_k2 } => {
 256                                                 if *state != NoiseStep::PreActOne {
 257                                                         panic!("Requested act at wrong step");
 258                                                 }
 259
 260                                                 let (their_pub, _) = try!(PeerChannelEncryptor::inbound_noise_act(&self.secp_ctx, bidirectional_state, act_one, &our_node_secret));
 261                                                 ie.get_or_insert(their_pub);
 262
 263                                                 re.get_or_insert(our_ephemeral);
 264
 265                                                 let (res, temp_k) = PeerChannelEncryptor::outbound_noise_act(&self.secp_ctx, bidirectional_state, &re.unwrap(), &ie.unwrap());
 266                                                 *temp_k2 = Some(temp_k);
 267                                                 *state = NoiseStep::PostActTwo;
 268                                                 Ok(res)
 269                                         },
 270                                         _ => panic!("Wrong direction for act"),
 271                                 },
 272                         _ => panic!("Cannot get act one after noise handshake completes"),
 273                 }
 274         }
 275
 276         pub fn process_act_one_with_key(&mut self, act_one: &[u8], our_node_secret: &SecretKey) -> Result<[u8; 50], HandleError> {
 277                 assert_eq!(act_one.len(), 50);
 278
 279                 let mut rng = thread_rng();
 280                 let mut key = [0u8; 32];
 281                 rng.fill_bytes(&mut key);
 282                 let our_ephemeral_key = SecretKey::from_slice(&self.secp_ctx, &key).unwrap(); //TODO: nicer rng-is-bad error message
 283                 self.process_act_one_with_ephemeral_key(act_one, our_node_secret, our_ephemeral_key)
 284         }
 285
 286         pub fn process_act_two(&mut self, act_two: &[u8], our_node_secret: &SecretKey) -> Result<[u8; 66], HandleError> {
 287                 assert_eq!(act_two.len(), 50);
 288
 289                 let mut final_hkdf = [0; 64];
 290                 let ck;
 291                 let res: [u8; 66] = match self.noise_state {
 292                         NoiseState::InProgress { ref state, ref directional_state, ref mut bidirectional_state } =>
 293                                 match directional_state {
 294                                         &DirectionalNoiseState::Outbound { ref ie } => {
 295                                                 if *state != NoiseStep::PostActOne {
 296                                                         panic!("Requested act at wrong step");
 297                                                 }
 298
 299                                                 let (re, temp_k2) = try!(PeerChannelEncryptor::inbound_noise_act(&self.secp_ctx, bidirectional_state, act_two, &ie));
 300
 301                                                 let mut res = [0; 66];
 302                                                 let our_node_id = PublicKey::from_secret_key(&self.secp_ctx, &our_node_secret).unwrap(); //TODO: nicer rng-is-bad error message
 303
 304                                                 PeerChannelEncryptor::encrypt_with_ad(&mut res[1..50], 1, &temp_k2, &bidirectional_state.h, &our_node_id.serialize()[..]);
 305
 306                                                 let mut sha = Sha256::new();
 307                                                 sha.input(&bidirectional_state.h);
 308                                                 sha.input(&res[1..50]);
 309                                                 sha.result(&mut bidirectional_state.h);
 310
 311                                                 let ss = SharedSecret::new(&self.secp_ctx, &re, our_node_secret);
 312                                                 let temp_k = PeerChannelEncryptor::hkdf(bidirectional_state, ss);
 313
 314                                                 PeerChannelEncryptor::encrypt_with_ad(&mut res[50..], 0, &temp_k, &bidirectional_state.h, &[0; 0]);
 315
 316                                                 sha.reset();
 317                                                 let mut prk = [0; 32];
 318                                                 hkdf_extract(sha, &bidirectional_state.ck, &[0; 0], &mut prk);
 319                                                 hkdf_expand(sha, &prk, &[0;0], &mut final_hkdf);
 320                                                 ck = bidirectional_state.ck.clone();
 321                                                 res
 322                                         },
 323                                         _ => panic!("Wrong direction for act"),
 324                                 },
 325                         _ => panic!("Cannot get act one after noise handshake completes"),
 326                 };
 327
 328                 let mut sk = [0; 32];
 329                 let mut rk = [0; 32];
 330                 sk.copy_from_slice(&final_hkdf[0..32]);
 331                 rk.copy_from_slice(&final_hkdf[32..]);
 332
 333                 self.noise_state = NoiseState::Finished {
 334                         sk: sk,
 335                         sn: 0,
 336                         sck: ck.clone(),
 337                         rk: rk,
 338                         rn: 0,
 339                         rck: ck,
 340                 };
 341
 342                 Ok(res)
 343         }
 344
 345         pub fn process_act_three(&mut self, act_three: &[u8]) -> Result<PublicKey, HandleError> {
 346                 assert_eq!(act_three.len(), 66);
 347
 348                 let mut final_hkdf = [0; 64];
 349                 let ck;
 350                 match self.noise_state {
 351                         NoiseState::InProgress { ref state, ref directional_state, ref mut bidirectional_state } =>
 352                                 match directional_state {
 353                                         &DirectionalNoiseState::Inbound { ie: _, ref re, ref temp_k2 } => {
 354                                                 if *state != NoiseStep::PostActTwo {
 355                                                         panic!("Requested act at wrong step");
 356                                                 }
 357                                                 if act_three[0] != 0 {
 358                                                         return Err(HandleError{err: "Unknown handshake version number", msg: Some(msgs::ErrorMessage::DisconnectPeer{})});
 359                                                 }
 360
 361                                                 let mut their_node_id = [0; 33];
 362                                                 try!(PeerChannelEncryptor::decrypt_with_ad(&mut their_node_id, 1, &temp_k2.unwrap(), &bidirectional_state.h, &act_three[1..50]));
 363                                                 self.their_node_id = Some(match PublicKey::from_slice(&self.secp_ctx, &their_node_id) {
 364                                                         Ok(key) => key,
 365                                                         Err(_) => return Err(HandleError{err: "Bad node_id from peer", msg: Some(msgs::ErrorMessage::DisconnectPeer{})}),
 366                                                 });
 367
 368                                                 let mut sha = Sha256::new();
 369                                                 sha.input(&bidirectional_state.h);
 370                                                 sha.input(&act_three[1..50]);
 371                                                 sha.result(&mut bidirectional_state.h);
 372
 373                                                 let ss = SharedSecret::new(&self.secp_ctx, &self.their_node_id.unwrap(), &re.unwrap());
 374                                                 let temp_k = PeerChannelEncryptor::hkdf(bidirectional_state, ss);
 375
 376                                                 try!(PeerChannelEncryptor::decrypt_with_ad(&mut [0; 0], 0, &temp_k, &bidirectional_state.h, &act_three[50..]));
 377
 378                                                 sha.reset();
 379                                                 let mut prk = [0; 32];
 380                                                 hkdf_extract(sha, &bidirectional_state.ck, &[0; 0], &mut prk);
 381                                                 hkdf_expand(sha, &prk, &[0;0], &mut final_hkdf);
 382                                                 ck = bidirectional_state.ck.clone();
 383                                         },
 384                                         _ => panic!("Wrong direction for act"),
 385                                 },
 386                         _ => panic!("Cannot get act one after noise handshake completes"),
 387                 }
 388
 389                 let mut rk = [0; 32];
 390                 let mut sk = [0; 32];
 391                 rk.copy_from_slice(&final_hkdf[0..32]);
 392                 sk.copy_from_slice(&final_hkdf[32..]);
 393
 394                 self.noise_state = NoiseState::Finished {
 395                         sk: sk,
 396                         sn: 0,
 397                         sck: ck.clone(),
 398                         rk: rk,
 399                         rn: 0,
 400                         rck: ck,
 401                 };
 402
 403                 Ok(self.their_node_id.unwrap().clone())
 404         }
 405
 406         /// Encrypts the given message, returning the encrypted version
 407         /// panics if msg.len() > 65535 or Noise handshake has not finished.
 408         pub fn encrypt_message(&mut self, msg: &[u8]) -> Vec<u8> {
 409                 if msg.len() > 65535 {
 410                         panic!("Attempted to encrypt message longer than 65535 bytes!");
 411                 }
 412
 413                 let mut res = Vec::with_capacity(msg.len() + 16*2 + 2);
 414                 res.resize(msg.len() + 16*2 + 2, 0);
 415
 416                 match self.noise_state {
 417                         NoiseState::Finished { ref mut sk, ref mut sn, ref mut sck, rk: _, rn: _, rck: _ } => {
 418                                 if *sn >= 1000 {
 419                                         let mut sha = Sha256::new();
 420                                         let mut prk = [0; 32];
 421                                         hkdf_extract(sha, sck, sk, &mut prk);
 422                                         let mut hkdf = [0; 64];
 423                                         hkdf_expand(sha, &prk, &[0;0], &mut hkdf);
 424
 425                                         sck[..].copy_from_slice(&hkdf[0..32]);
 426                                         sk[..].copy_from_slice(&hkdf[32..]);
 427                                         *sn = 0;
 428                                 }
 429
 430                                 Self::encrypt_with_ad(&mut res[0..16+2], *sn, sk, &[0; 0], &byte_utils::be16_to_array(msg.len() as u16));
 431                                 *sn += 1;
 432
 433                                 Self::encrypt_with_ad(&mut res[16+2..], *sn, sk, &[0; 0], msg);
 434                                 *sn += 1;
 435                         },
 436                         _ => panic!("Tried to encrypt a message prior to noise handshake completion"),
 437                 }
 438
 439                 res
 440         }
 441
 442         /// Decrypts a message length header from the remote peer.
 443         /// panics if noise handshake has not yet finished or msg.len() != 18
 444         pub fn decrypt_length_header(&mut self, msg: &[u8]) -> Result<u16, HandleError> {
 445                 assert_eq!(msg.len(), 16+2);
 446
 447                 match self.noise_state {
 448                         NoiseState::Finished { sk: _, sn: _, sck: _, ref mut rk, ref mut rn, ref mut rck } => {
 449                                 if *rn >= 1000 {
 450                                         let mut sha = Sha256::new();
 451                                         let mut prk = [0; 32];
 452                                         hkdf_extract(sha, rck, rk, &mut prk);
 453                                         let mut hkdf = [0; 64];
 454                                         hkdf_expand(sha, &prk, &[0;0], &mut hkdf);
 455
 456                                         rck[..].copy_from_slice(&hkdf[0..32]);
 457                                         rk[..].copy_from_slice(&hkdf[32..]);
 458                                         *rn = 0;
 459                                 }
 460
 461                                 let mut res = [0; 2];
 462                                 try!(Self::decrypt_with_ad(&mut res, *rn, rk, &[0; 0], msg));
 463                                 *rn += 1;
 464                                 Ok(byte_utils::slice_to_be16(&res))
 465                         },
 466                         _ => panic!("Tried to encrypt a message prior to noise handshake completion"),
 467                 }
 468         }
 469
 470         /// Decrypts the given message.
 471         /// panics if msg.len() > 65535 + 16
 472         pub fn decrypt_message(&mut self, msg: &[u8]) -> Result<Vec<u8>, HandleError> {
 473                 if msg.len() > 65535 + 16 {
 474                         panic!("Attempted to encrypt message longer than 65535 bytes!");
 475                 }
 476
 477                 match self.noise_state {
 478                         NoiseState::Finished { sk: _, sn: _, sck: _, ref rk, ref mut rn, rck: _ } => {
 479                                 let mut res = Vec::with_capacity(msg.len() - 16);
 480                                 res.resize(msg.len() - 16, 0);
 481                                 try!(Self::decrypt_with_ad(&mut res[..], *rn, rk, &[0; 0], msg));
 482                                 *rn += 1;
 483
 484                                 Ok(res)
 485                         },
 486                         _ => panic!("Tried to encrypt a message prior to noise handshake completion"),
 487                 }
 488         }
 489
 490         pub fn get_noise_step(&self) -> NextNoiseStep {
 491                 match self.noise_state {
 492                         NoiseState::InProgress {ref state, ..} => {
 493                                 match state {
 494                                         &NoiseStep::PreActOne => NextNoiseStep::ActOne,
 495                                         &NoiseStep::PostActOne => NextNoiseStep::ActTwo,
 496                                         &NoiseStep::PostActTwo => NextNoiseStep::ActThree,
 497                                 }
 498                         },
 499                         NoiseState::Finished {..} => NextNoiseStep::NoiseComplete,
 500                 }
 501         }
 502
 503         pub fn is_ready_for_encryption(&self) -> bool {
 504                 match self.noise_state {
 505                         NoiseState::InProgress {..} => { false },
 506                         NoiseState::Finished {..} => { true }
 507                 }
 508         }
 509 }
 510
 511 #[cfg(test)]
 512 mod tests {
 513         use secp256k1::Secp256k1;
 514         use secp256k1::key::{PublicKey,SecretKey};
 515
 516         use bitcoin::util::misc::hex_bytes;
 517
 518         use ln::peer_channel_encryptor::{PeerChannelEncryptor,NoiseState,DirectionalNoiseState};
 519
 520         fn get_outbound_peer_for_initiator_test_vectors() -> PeerChannelEncryptor {
 521                 let secp_ctx = Secp256k1::new();
 522                 let their_node_id = PublicKey::from_slice(&secp_ctx, &hex_bytes("028d7500dd4c12685d1f568b4c2b5048e8534b873319f3a8daa612b469132ec7f7").unwrap()[..]).unwrap();
 523
 524                 let mut outbound_peer = PeerChannelEncryptor::new_outbound(their_node_id);
 525                 match outbound_peer.noise_state {
 526                         NoiseState::InProgress { state: _, ref mut directional_state, bidirectional_state: _ } => {
 527                                 *directional_state = DirectionalNoiseState::Outbound { // overwrite ie...
 528                                         ie: SecretKey::from_slice(&secp_ctx, &hex_bytes("1212121212121212121212121212121212121212121212121212121212121212").unwrap()[..]).unwrap(),
 529                                 };
 530                         },
 531                         _ => panic!()
 532                 }
 533
 534                 assert_eq!(outbound_peer.get_act_one()[..], hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap()[..]);
 535                 outbound_peer
 536         }
 537
 538         #[test]
 539         fn noise_initiator_test_vectors() {
 540                 let secp_ctx = Secp256k1::new();
 541                 let our_node_id = SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap();
 542
 543                 {
 544                         // transport-initiator successful handshake
 545                         let mut outbound_peer = get_outbound_peer_for_initiator_test_vectors();
 546
 547                         let act_two = hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap().to_vec();
 548                         assert_eq!(outbound_peer.process_act_two(&act_two[..], &our_node_id).unwrap()[..], hex_bytes("00b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba").unwrap()[..]);
 549
 550                         match outbound_peer.noise_state {
 551                                 NoiseState::Finished { sk, sn, sck, rk, rn, rck } => {
 552                                         assert_eq!(sk, hex_bytes("969ab31b4d288cedf6218839b27a3e2140827047f2c0f01bf5c04435d43511a9").unwrap()[..]);
 553                                         assert_eq!(sn, 0);
 554                                         assert_eq!(sck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 555                                         assert_eq!(rk, hex_bytes("bb9020b8965f4df047e07f955f3c4b88418984aadc5cdb35096b9ea8fa5c3442").unwrap()[..]);
 556                                         assert_eq!(rn, 0);
 557                                         assert_eq!(rck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 558                                 },
 559                                 _ => panic!()
 560                         }
 561                 }
 562                 {
 563                         // transport-initiator act2 short read test
 564                         // Can't actually test this cause process_act_two requires you pass the right length!
 565                 }
 566                 {
 567                         // transport-initiator act2 bad version test
 568                         let mut outbound_peer = get_outbound_peer_for_initiator_test_vectors();
 569
 570                         let act_two = hex_bytes("0102466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap().to_vec();
 571                         assert!(outbound_peer.process_act_two(&act_two[..], &our_node_id).is_err());
 572                 }
 573
 574                 {
 575                         // transport-initiator act2 bad key serialization test
 576                         let mut outbound_peer = get_outbound_peer_for_initiator_test_vectors();
 577
 578                         let act_two = hex_bytes("0004466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap().to_vec();
 579                         assert!(outbound_peer.process_act_two(&act_two[..], &our_node_id).is_err());
 580                 }
 581
 582                 {
 583                         // transport-initiator act2 bad MAC test
 584                         let mut outbound_peer = get_outbound_peer_for_initiator_test_vectors();
 585
 586                         let act_two = hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730af").unwrap().to_vec();
 587                         assert!(outbound_peer.process_act_two(&act_two[..], &our_node_id).is_err());
 588                 }
 589         }
 590
 591         #[test]
 592         fn noise_responder_test_vectors() {
 593                 let secp_ctx = Secp256k1::new();
 594                 let our_node_id = SecretKey::from_slice(&secp_ctx, &hex_bytes("2121212121212121212121212121212121212121212121212121212121212121").unwrap()[..]).unwrap();
 595                 let our_ephemeral = SecretKey::from_slice(&secp_ctx, &hex_bytes("2222222222222222222222222222222222222222222222222222222222222222").unwrap()[..]).unwrap();
 596
 597                 {
 598                         // transport-responder successful handshake
 599                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 600
 601                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 602                         assert_eq!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).unwrap()[..], hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap()[..]);
 603
 604                         let act_three = hex_bytes("00b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba").unwrap().to_vec();
 605                         // test vector doesn't specify the initiator static key, but its the same as the one
 606                         // from trasport-initiator successful handshake
 607                         assert_eq!(inbound_peer.process_act_three(&act_three[..]).unwrap().serialize()[..], hex_bytes("034f355bdcb7cc0af728ef3cceb9615d90684bb5b2ca5f859ab0f0b704075871aa").unwrap()[..]);
 608
 609                         match inbound_peer.noise_state {
 610                                 NoiseState::Finished { sk, sn, sck, rk, rn, rck } => {
 611                                         assert_eq!(sk, hex_bytes("bb9020b8965f4df047e07f955f3c4b88418984aadc5cdb35096b9ea8fa5c3442").unwrap()[..]);
 612                                         assert_eq!(sn, 0);
 613                                         assert_eq!(sck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 614                                         assert_eq!(rk, hex_bytes("969ab31b4d288cedf6218839b27a3e2140827047f2c0f01bf5c04435d43511a9").unwrap()[..]);
 615                                         assert_eq!(rn, 0);
 616                                         assert_eq!(rck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 617                                 },
 618                                 _ => panic!()
 619                         }
 620                 }
 621                 {
 622                         // transport-responder act1 short read test
 623                         // Can't actually test this cause process_act_one requires you pass the right length!
 624                 }
 625                 {
 626                         // transport-responder act1 bad version test
 627                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 628
 629                         let act_one = hex_bytes("01036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 630                         assert!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).is_err());
 631                 }
 632                 {
 633                         // transport-responder act1 bad key serialization test
 634                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 635
 636                         let act_one =hex_bytes("00046360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 637                         assert!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).is_err());
 638                 }
 639                 {
 640                         // transport-responder act1 bad MAC test
 641                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 642
 643                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6b").unwrap().to_vec();
 644                         assert!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).is_err());
 645                 }
 646                 {
 647                         // transport-responder act3 bad version test
 648                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 649
 650                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 651                         assert_eq!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).unwrap()[..], hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap()[..]);
 652
 653                         let act_three = hex_bytes("01b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba").unwrap().to_vec();
 654                         assert!(inbound_peer.process_act_three(&act_three[..]).is_err());
 655                 }
 656                 {
 657                         // transport-responder act3 short read test
 658                         // Can't actually test this cause process_act_three requires you pass the right length!
 659                 }
 660                 {
 661                         // transport-responder act3 bad MAC for ciphertext test
 662                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 663
 664                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 665                         assert_eq!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).unwrap()[..], hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap()[..]);
 666
 667                         let act_three = hex_bytes("00c9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba").unwrap().to_vec();
 668                         assert!(inbound_peer.process_act_three(&act_three[..]).is_err());
 669                 }
 670                 {
 671                         // transport-responder act3 bad rs test
 672                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 673
 674                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 675                         assert_eq!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).unwrap()[..], hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap()[..]);
 676
 677                         let act_three = hex_bytes("00bfe3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa2235536ad09a8ee351870c2bb7f78b754a26c6cef79a98d25139c856d7efd252c2ae73c").unwrap().to_vec();
 678                         assert!(inbound_peer.process_act_three(&act_three[..]).is_err());
 679                 }
 680                 {
 681                         // transport-responder act3 bad MAC test
 682                         let mut inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 683
 684                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 685                         assert_eq!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).unwrap()[..], hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap()[..]);
 686
 687                         let act_three = hex_bytes("00b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139bb").unwrap().to_vec();
 688                         assert!(inbound_peer.process_act_three(&act_three[..]).is_err());
 689                 }
 690         }
 691
 692
 693         #[test]
 694         fn message_encryption_decryption_test_vectors() {
 695                 let secp_ctx = Secp256k1::new();
 696
 697                 // We use the same keys as the initiator and responder test vectors, so we copy those tests
 698                 // here and use them to encrypt.
 699                 let mut outbound_peer = get_outbound_peer_for_initiator_test_vectors();
 700
 701                 {
 702                         let our_node_id = SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap();
 703
 704                         let act_two = hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap().to_vec();
 705                         assert_eq!(outbound_peer.process_act_two(&act_two[..], &our_node_id).unwrap()[..], hex_bytes("00b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba").unwrap()[..]);
 706
 707                         match outbound_peer.noise_state {
 708                                 NoiseState::Finished { sk, sn, sck, rk, rn, rck } => {
 709                                         assert_eq!(sk, hex_bytes("969ab31b4d288cedf6218839b27a3e2140827047f2c0f01bf5c04435d43511a9").unwrap()[..]);
 710                                         assert_eq!(sn, 0);
 711                                         assert_eq!(sck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 712                                         assert_eq!(rk, hex_bytes("bb9020b8965f4df047e07f955f3c4b88418984aadc5cdb35096b9ea8fa5c3442").unwrap()[..]);
 713                                         assert_eq!(rn, 0);
 714                                         assert_eq!(rck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 715                                 },
 716                                 _ => panic!()
 717                         }
 718                 }
 719
 720                 let mut inbound_peer;
 721
 722                 {
 723                         // transport-responder successful handshake
 724                         let our_node_id = SecretKey::from_slice(&secp_ctx, &hex_bytes("2121212121212121212121212121212121212121212121212121212121212121").unwrap()[..]).unwrap();
 725                         let our_ephemeral = SecretKey::from_slice(&secp_ctx, &hex_bytes("2222222222222222222222222222222222222222222222222222222222222222").unwrap()[..]).unwrap();
 726
 727                         inbound_peer = PeerChannelEncryptor::new_inbound(&our_node_id);
 728
 729                         let act_one = hex_bytes("00036360e856310ce5d294e8be33fc807077dc56ac80d95d9cd4ddbd21325eff73f70df6086551151f58b8afe6c195782c6a").unwrap().to_vec();
 730                         assert_eq!(inbound_peer.process_act_one_with_ephemeral_key(&act_one[..], &our_node_id, our_ephemeral.clone()).unwrap()[..], hex_bytes("0002466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f276e2470b93aac583c9ef6eafca3f730ae").unwrap()[..]);
 731
 732                         let act_three = hex_bytes("00b9e3a702e93e3a9948c2ed6e5fd7590a6e1c3a0344cfc9d5b57357049aa22355361aa02e55a8fc28fef5bd6d71ad0c38228dc68b1c466263b47fdf31e560e139ba").unwrap().to_vec();
 733                         // test vector doesn't specify the initiator static key, but its the same as the one
 734                         // from trasport-initiator successful handshake
 735                         assert_eq!(inbound_peer.process_act_three(&act_three[..]).unwrap().serialize()[..], hex_bytes("034f355bdcb7cc0af728ef3cceb9615d90684bb5b2ca5f859ab0f0b704075871aa").unwrap()[..]);
 736
 737                         match inbound_peer.noise_state {
 738                                 NoiseState::Finished { sk, sn, sck, rk, rn, rck } => {
 739                                         assert_eq!(sk, hex_bytes("bb9020b8965f4df047e07f955f3c4b88418984aadc5cdb35096b9ea8fa5c3442").unwrap()[..]);
 740                                         assert_eq!(sn, 0);
 741                                         assert_eq!(sck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 742                                         assert_eq!(rk, hex_bytes("969ab31b4d288cedf6218839b27a3e2140827047f2c0f01bf5c04435d43511a9").unwrap()[..]);
 743                                         assert_eq!(rn, 0);
 744                                         assert_eq!(rck, hex_bytes("919219dbb2920afa8db80f9a51787a840bcf111ed8d588caf9ab4be716e42b01").unwrap()[..]);
 745                                 },
 746                                 _ => panic!()
 747                         }
 748                 }
 749
 750                 for i in 0..1005 {
 751                         let msg = [0x68, 0x65, 0x6c, 0x6c, 0x6f];
 752                         let res = outbound_peer.encrypt_message(&msg);
 753                         assert_eq!(res.len(), 5 + 2*16 + 2);
 754
 755                         let mut len_header = res[0..2+16].to_vec();
 756                         assert_eq!(inbound_peer.decrypt_length_header(&len_header[..]).unwrap() as usize, msg.len());
 757                         assert_eq!(inbound_peer.decrypt_message(&res[2+16..]).unwrap()[..], msg[..]);
 758
 759                         if i == 0 {
 760                                 assert_eq!(res, hex_bytes("cf2b30ddf0cf3f80e7c35a6e6730b59fe802473180f396d88a8fb0db8cbcf25d2f214cf9ea1d95").unwrap());
 761                         } else if i == 1 {
 762                                 assert_eq!(res, hex_bytes("72887022101f0b6753e0c7de21657d35a4cb2a1f5cde2650528bbc8f837d0f0d7ad833b1a256a1").unwrap());
 763                         } else if i == 500 {
 764                                 assert_eq!(res, hex_bytes("178cb9d7387190fa34db9c2d50027d21793c9bc2d40b1e14dcf30ebeeeb220f48364f7a4c68bf8").unwrap());
 765                         } else if i == 501 {
 766                                 assert_eq!(res, hex_bytes("1b186c57d44eb6de4c057c49940d79bb838a145cb528d6e8fd26dbe50a60ca2c104b56b60e45bd").unwrap());
 767                         } else if i == 1000 {
 768                                 assert_eq!(res, hex_bytes("4a2f3cc3b5e78ddb83dcb426d9863d9d9a723b0337c89dd0b005d89f8d3c05c52b76b29b740f09").unwrap());
 769                         } else if i == 1001 {
 770                                 assert_eq!(res, hex_bytes("2ecd8c8a5629d0d02ab457a0fdd0f7b90a192cd46be5ecb6ca570bfc5e268338b1a16cf4ef2d36").unwrap());
 771                         }
 772                 }
 773         }
 774 }