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