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