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Bolt 4: add route blinding construction
Add specification requirements for creating and using blinded routes. This commit contains the low-level details of the route blinding scheme, decoupled from how it can be used by high-level components such as onion messages or payments.
This commit is contained in:
t-bast
Bastien Teinturier
parent
ebd0659fc9
commit
58d80473e0
2 changed files with 287 additions and 0 deletions
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@ -50,6 +50,7 @@ A node:
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* [Packet Structure](#packet-structure)
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* [Packet Structure](#packet-structure)
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* [Payload Format](#payload-format)
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* [Payload Format](#payload-format)
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* [Basic Multi-Part Payments](#basic-multi-part-payments)
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* [Basic Multi-Part Payments](#basic-multi-part-payments)
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* [Route Blinding](#route-blinding)
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* [Accepting and Forwarding a Payment](#accepting-and-forwarding-a-payment)
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* [Accepting and Forwarding a Payment](#accepting-and-forwarding-a-payment)
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* [Payload for the Last Node](#payload-for-the-last-node)
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* [Payload for the Last Node](#payload-for-the-last-node)
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* [Non-strict Forwarding](#non-strict-forwarding)
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* [Non-strict Forwarding](#non-strict-forwarding)
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@ -352,6 +353,153 @@ otherwise meets the amount criterion (eg. some other failure, or
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invoice timeout), however if it were to fulfill only some of them,
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invoice timeout), however if it were to fulfill only some of them,
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intermediary nodes could simply claim the remaining ones.
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intermediary nodes could simply claim the remaining ones.
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### Route Blinding
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Nodes receiving onion packets may hide their identity from senders by
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"blinding" an arbitrary amount of hops at the end of an onion path.
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When using route blinding, nodes find a route to themselves from a given
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"introduction node". They then use ECDH with each node in that route to create
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a "blinded" node ID and an encrypted blob (`encrypted_data`) for each one of
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the blinded nodes.
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They communicate this blinded route and the encrypted blobs to the sender.
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The sender finds a route to the introduction node and extends it with the
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blinded route provided by the recipient. The sender includes the encrypted
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blobs in the corresponding onion payloads: they allow nodes in the blinded
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part of the route to "unblind" the next node and correctly forward the packet.
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The `encrypted_data` is a TLV stream, encrypted for a given blinded node, that
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may contain the following TLV fields:
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1. `tlv_stream`: `encrypted_data_tlv`
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2. types:
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1. type: 1 (`padding`)
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2. data:
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* [`...*byte`:`padding`]
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1. type: 2 (`short_channel_id`)
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2. data:
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* [`short_channel_id`:`short_channel_id`]
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1. type: 4 (`next_node_id`)
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2. data:
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* [`point`:`node_id`]
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1. type: 6 (`path_id`)
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2. data:
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* [`...*byte`:`data`]
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1. type: 8 (`next_blinding_override`)
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2. data:
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* [`point`:`blinding`]
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#### Requirements
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A recipient N(r) creating a blinded route `N(0) -> N(1) -> ... -> N(r)` to itself:
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- MUST create a blinded node ID `B(i)` for each node using the following algorithm:
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- `e(0) <- {0;1}^256`
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- `E(0) = e(0) * G`
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- For every node in the route:
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- let `N(i) = k(i) * G` be the `node_id` (`k(i)` is `N(i)`'s private key)
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- `ss(i) = SHA256(e(i) * N(i)) = SHA256(k(i) * E(i))` (ECDH shared secret known only by `N(r)` and `N(i)`)
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- `B(i) = HMAC256("blinded_node_id", ss(i)) * N(i)` (blinded `node_id` for `N(i)`, private key known only by `N(i)`)
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- `rho(i) = HMAC256("rho", ss(i))` (key used to encrypt the payload for `N(i)` by `N(r)`)
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- `e(i+1) = SHA256(E(i) || ss(i)) * e(i)` (blinding ephemeral private key, only known by `N(r)`)
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- `E(i+1) = SHA256(E(i) || ss(i)) * E(i)` (NB: `N(i)` MUST NOT learn `e(i)`)
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- If it creates `encrypted_data` payloads for blinded nodes:
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- MUST encrypt them with ChaCha20-Poly1305 using the `rho(i)` key and an all-zero nonce
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- MAY store private data in the `path_id` of the payload to itself to verify
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that the route is used in the right context and was created by them
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- SHOULD add padding data to ensure all `encrypted_data` have the same length
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- MUST communicate the blinded node IDs `B(i)` and `encrypted_data(i)` to the sender
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- MUST communicate the real node ID of the introduction point `N(0)` to the sender
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- MUST communicate the first blinding ephemeral key `E(0)` to the sender
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The sender:
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- MUST provide the `encrypted_data` field for each node in the blinded route
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in their respective onion payloads
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- MUST communicate `E(0)` to the introduction point (e.g. in the onion payload
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for that node or in a tlv field of the lightning message)
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The introduction point:
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- MUST compute:
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- `ss(0) = SHA256(k(0) * E(0))` (standard ECDH)
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- `rho(0) = HMAC256("rho", ss(0))`
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- `E(1) = SHA256(E(0) || ss(0)) * E(0)`
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- If an `encrypted_data` field is provided:
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- MUST decrypt it using `rho(0)`
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- MUST use the decrypted fields to locate the next node
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- If `encrypted_data` contains a `next_blinding_override`:
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- MUST use it as the next blinding point instead of `E(1)`
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- Otherwise:
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- MUST use `E(1)` as the next blinding point
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- MUST forward the onion and include the next blinding point in the lightning
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message for the next node
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An intermediate node in the blinded route:
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- MUST compute:
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- `ss(i) = SHA256(k(i) * E(i))` (standard ECDH)
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- `b(i) = HMAC256("blinded_node_id", ss(i)) * k(i)`
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- `rho(i) = HMAC256("rho", ss(i))`
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- `E(i+1) = SHA256(E(i) || ss(i)) * E(i)`
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- MUST use `b(i)` instead of its private key `k(i)` to decrypt the onion. Note
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that the node may instead tweak the onion ephemeral key with
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`HMAC256("blinded_node_id", ss(i))` which achieves the same result.
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- If an `encrypted_data` field is provided:
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- MUST decrypt it using `rho(i)`
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- MUST use the decrypted fields to locate the next node
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- If `encrypted_data` contains a `next_blinding_override`:
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- MUST use it as the next blinding point instead of `E(i+1)`
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- Otherwise:
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- MUST use `E(i+1)` as the next blinding point
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- MUST forward the onion and include the next blinding point in the lightning
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message for the next node
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The final recipient:
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- MUST compute:
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- `ss(r) = SHA256(k(r) * E(r))` (standard ECDH)
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- `b(r) = HMAC256("blinded_node_id", ss(r)) * k(r)`
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- `rho(r) = HMAC256("rho", ss(r))`
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- If an `encrypted_data` field is provided:
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- MUST decrypt it using `rho(r)`
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- MUST ignore the message if the `path_id` does not match the blinded route it
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created
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#### Rationale
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Route blinding is a lightweight technique to provide recipient anonymity.
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It's more flexible than rendezvous routing because it simply replaces the public
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keys of the nodes in the route with random public keys while letting senders
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choose what data they put in the onion for each hop. Blinded routes are also
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reusable in some cases (e.g. onion messages).
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Each node in the blinded route needs to receive `E(i)` to be able to decrypt
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the onion and the `encrypted_data` payload. Protocols that use route blinding
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must specify how this value is propagated between nodes.
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When concatenating two blinded routes generated by different nodes, the
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last node of the first route needs to know the first `blinding_point` of the
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second route: the `next_blinding_override` field must be used to transmit this
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information.
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The final recipient must verify that the blinded route is used in the right
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context (e.g. for a specific payment) and was created by them. Otherwise a
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malicious sender could create different blinded routes to all the nodes that
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they suspect could be the real recipient and try them until one accepts the
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message. The recipient can protect against that by storing `E(r)` and the
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context (e.g. a `payment_hash`), and verifying that they match when receiving
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the onion. Otherwise, to avoid additional storage cost, it can put some private
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context information in the `path_id` field (e.g. the `payment_preimage`) and
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verify that when receiving the onion. Note that it's important to use private
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information in that case, that senders cannot have access to.
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The `padding` field can be used to ensure that all `encrypted_data` have the
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same length. It's particularly useful when adding dummy hops at the end of a
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blinded route, to prevent the sender from figuring out which node is the final
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recipient.
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# Accepting and Forwarding a Payment
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# Accepting and Forwarding a Payment
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Once a node has decoded the payload it either accepts the payment locally, or forwards it to the peer indicated as the next hop in the payload.
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Once a node has decoded the payload it either accepts the payment locally, or forwards it to the peer indicated as the next hop in the payload.
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139
bolt04/route-blinding-test.json
Normal file
139
bolt04/route-blinding-test.json
Normal file
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@ -0,0 +1,139 @@
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{
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"comment": "test vector for using blinded routes",
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"generate": {
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"comment": "This section contains test data for creating a blinded route. This route is the concatenation of two blinded routes: one from Dave to Eve and one from Bob to Carol.",
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"hops": [
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{
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"comment": "Bob creates a Bob -> Carol route with the following session_key and concatenates it with the Dave -> Eve route.",
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"session_key": "0202020202020202020202020202020202020202020202020202020202020202",
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"alias": "Bob",
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"node_id": "0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c",
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"tlvs": {
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"padding": "00000000000000000000000000000000",
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"short_channel_id": "0x0x42",
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"next_node_id": "027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007",
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"unknown_tag_65001": "123456"
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},
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"encoded_tlvs": "0110000000000000000000000000000000000208000000000000002a0421027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007fdfde903123456",
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"ephemeral_privkey": "0202020202020202020202020202020202020202020202020202020202020202",
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"ephemeral_pubkey": "024d4b6cd1361032ca9bd2aeb9d900aa4d45d9ead80ac9423374c451a7254d0766",
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"shared_secret": "76771bab0cc3d0de6e6f60147fd7c9c7249a5ced3d0612bdfaeec3b15452229d",
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"rho": "ba217b23c0978d84c4a19be8a9ff64bc1b40ed0d7ecf59521567a5b3a9a1dd48",
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"encrypted_data": "cd4b00ff9c09ed28102b210ac73aa12d63e90a5acebc496c49f57c639e098acbaec5b5ffb8592b07bdb6665ccb56f1258ab1857383f6542c8371dcee568a0a35a218288814849db13ce6f84a464fa517d9e1684333e3",
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"blinded_node_id": "03da173ad2aee2f701f17e59fbd16cb708906d69838a5f088e8123fb36e89a2c25"
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},
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{
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"comment": "Notice the next_blinding_override tlv in Carol's payload, indicating that Bob concatenated his route with another blinded route starting at Dave.",
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"alias": "Carol",
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"node_id": "027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007",
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"tlvs": {
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"next_node_id": "032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991",
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"next_blinding_override": "031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f"
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},
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"encoded_tlvs": "0421032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e6686809910821031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f",
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"ephemeral_privkey": "0a2aa791ac81265c139237b2b84564f6000b1d4d0e68d4b9cc97c5536c9b61c1",
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"ephemeral_pubkey": "034e09f450a80c3d252b258aba0a61215bf60dda3b0dc78ffb0736ea1259dfd8a0",
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"shared_secret": "dc91516ec6b530a3d641c01f29b36ed4dc29a74e063258278c0eeed50313d9b8",
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"rho": "d1e62bae1a8e169da08e6204997b60b1a7971e0f246814c648125c35660f5416",
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"encrypted_data": "ca26157e44ab01e82becf86497e1d05ad3e70903d22721210af41d791bf406873024d95b7a1ad128b2526932febfeeab237000563c1f33c78530b3880f8407326eef8bc004932b22323d13343ef740019c08e538e5c5",
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"blinded_node_id": "02e466727716f044290abf91a14a6d90e87487da160c2a3cbd0d465d7a78eb83a7"
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},
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{
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"comment": "Eve creates a Dave -> Eve blinded route using the following session_key.",
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"session_key": "0101010101010101010101010101010101010101010101010101010101010101",
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"alias": "Dave",
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"node_id": "032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991",
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"tlvs": {
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"padding": "0000000000000000000000000000000000000000000000",
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"short_channel_id": "0x0x561",
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"next_node_id": "02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145"
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},
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"encoded_tlvs": "0117000000000000000000000000000000000000000000000002080000000000000231042102edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145",
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"ephemeral_privkey": "0101010101010101010101010101010101010101010101010101010101010101",
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"ephemeral_pubkey": "031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f",
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"shared_secret": "dc46f3d1d99a536300f17bc0512376cc24b9502c5d30144674bfaa4b923d9057",
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"rho": "393aa55d35c9e207a8f28180b81628a31dff558c84959cdc73130f8c321d6a06",
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"encrypted_data": "0f94a72cff3b64a3d6e1e4903cf8c8b0a17144aeb249dcb86563a5ee1f679ee8db3c6719bd4364f469aa5fea76ffdc49543d568a707ab73a3e855b25ca585bf12c9d5c9cb6c5c10374a4a66d95aeeea4fe146d0c2754",
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"blinded_node_id": "036861b366f284f0a11738ffbf7eda46241a8977592878fe3175ae1d1e4754eccf"
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},
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{
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"comment": "Eve is the final recipient, so she included a path_id in her own payload to verify that the route is used when she expects it.",
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"alias": "Eve",
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"node_id": "02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145",
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"tlvs": {
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"padding": "0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
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"path_id": "00112233445566778899aabbccddeeff",
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"unknown_tag_65535": "06c1"
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},
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"encoded_tlvs": "012c0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000061000112233445566778899aabbccddeefffdffff0206c1",
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"ephemeral_privkey": "62e8bcd6b5f7affe29bec4f0515aab2eebd1ce848f4746a9638aa14e3024fb1b",
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"ephemeral_pubkey": "03e09038ee76e50f444b19abf0a555e8697e035f62937168b80adf0931b31ce52a",
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"shared_secret": "352a706b194c2b6d0a04ba1f617383fb816dc5f8f9ac0b60dd19c9ae3b517289",
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"rho": "719d0307340b1c68b79865111f0de6e97b093a30bc603cebd1beb9eef116f2d8",
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"encrypted_data": "da2c7e5f7881219884beae6ae68971de73bab4c3055d9865b1afb60722a63a7e4ea796de84fc9af674952e900ff518ed6b3640a7e47b5f3e4fbce5fab87e47a11d84c66d1234f1cec1da2f56b72b64896509aef9b754",
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"blinded_node_id": "021982a48086cb8984427d3727fe35a03d396b234f0701f5249daa12e8105c8dae"
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}
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]
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},
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"route": {
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"comment": "This section contains the resulting blinded route, which can then be used inside onion messages or payments.",
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"introduction_node_id": "0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c",
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"blinding": "024d4b6cd1361032ca9bd2aeb9d900aa4d45d9ead80ac9423374c451a7254d0766",
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"hops": [
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{
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||||||
|
"blinded_node_id": "03da173ad2aee2f701f17e59fbd16cb708906d69838a5f088e8123fb36e89a2c25",
|
||||||
|
"encrypted_data": "cd4b00ff9c09ed28102b210ac73aa12d63e90a5acebc496c49f57c639e098acbaec5b5ffb8592b07bdb6665ccb56f1258ab1857383f6542c8371dcee568a0a35a218288814849db13ce6f84a464fa517d9e1684333e3"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"blinded_node_id": "02e466727716f044290abf91a14a6d90e87487da160c2a3cbd0d465d7a78eb83a7",
|
||||||
|
"encrypted_data": "ca26157e44ab01e82becf86497e1d05ad3e70903d22721210af41d791bf406873024d95b7a1ad128b2526932febfeeab237000563c1f33c78530b3880f8407326eef8bc004932b22323d13343ef740019c08e538e5c5"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"blinded_node_id": "036861b366f284f0a11738ffbf7eda46241a8977592878fe3175ae1d1e4754eccf",
|
||||||
|
"encrypted_data": "0f94a72cff3b64a3d6e1e4903cf8c8b0a17144aeb249dcb86563a5ee1f679ee8db3c6719bd4364f469aa5fea76ffdc49543d568a707ab73a3e855b25ca585bf12c9d5c9cb6c5c10374a4a66d95aeeea4fe146d0c2754"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"blinded_node_id": "021982a48086cb8984427d3727fe35a03d396b234f0701f5249daa12e8105c8dae",
|
||||||
|
"encrypted_data": "da2c7e5f7881219884beae6ae68971de73bab4c3055d9865b1afb60722a63a7e4ea796de84fc9af674952e900ff518ed6b3640a7e47b5f3e4fbce5fab87e47a11d84c66d1234f1cec1da2f56b72b64896509aef9b754"
|
||||||
|
}
|
||||||
|
]
|
||||||
|
},
|
||||||
|
"unblind": {
|
||||||
|
"comment": "This section contains test data for unblinding the route at each intermediate hop.",
|
||||||
|
"hops": [
|
||||||
|
{
|
||||||
|
"alias": "Bob",
|
||||||
|
"node_privkey": "4242424242424242424242424242424242424242424242424242424242424242",
|
||||||
|
"ephemeral_pubkey": "024d4b6cd1361032ca9bd2aeb9d900aa4d45d9ead80ac9423374c451a7254d0766",
|
||||||
|
"blinded_privkey": "d12fec0332c3e9d224789a17ebd93595f37d37bd8ef8bd3d2e6ce50acb9e554f",
|
||||||
|
"decrypted_data": "0110000000000000000000000000000000000208000000000000002a0421027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007fdfde903123456",
|
||||||
|
"next_ephemeral_pubkey": "034e09f450a80c3d252b258aba0a61215bf60dda3b0dc78ffb0736ea1259dfd8a0"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"alias": "Carol",
|
||||||
|
"node_privkey": "4343434343434343434343434343434343434343434343434343434343434343",
|
||||||
|
"ephemeral_pubkey": "034e09f450a80c3d252b258aba0a61215bf60dda3b0dc78ffb0736ea1259dfd8a0",
|
||||||
|
"blinded_privkey": "bfa697fbbc8bbc43ca076e6dd60d306038a32af216b9dc6fc4e59e5ae28823c1",
|
||||||
|
"decrypted_data": "0421032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e6686809910821031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f",
|
||||||
|
"next_ephemeral_pubkey": "03af5ccc91851cb294e3a364ce63347709a08cdffa58c672e9a5c587ddd1bbca60",
|
||||||
|
"next_ephemeral_pubkey_override": "031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"alias": "Dave",
|
||||||
|
"node_privkey": "4444444444444444444444444444444444444444444444444444444444444444",
|
||||||
|
"ephemeral_pubkey": "031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f",
|
||||||
|
"blinded_privkey": "cebc115c7fce4c295dc396dea6c79115b289b8ceeceea2ed61cf31428d88fc4e",
|
||||||
|
"decrypted_data": "0117000000000000000000000000000000000000000000000002080000000000000231042102edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145",
|
||||||
|
"next_ephemeral_pubkey": "03e09038ee76e50f444b19abf0a555e8697e035f62937168b80adf0931b31ce52a"
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"alias": "Eve",
|
||||||
|
"node_privkey": "4545454545454545454545454545454545454545454545454545454545454545",
|
||||||
|
"ephemeral_pubkey": "03e09038ee76e50f444b19abf0a555e8697e035f62937168b80adf0931b31ce52a",
|
||||||
|
"blinded_privkey": "ff4e07da8d92838bedd019ce532eb990ed73b574e54a67862a1df81b40c0d2af",
|
||||||
|
"decrypted_data": "012c0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000061000112233445566778899aabbccddeefffdffff0206c1",
|
||||||
|
"next_ephemeral_pubkey": "038fc6859a402b96ce4998c537c823d6ab94d1598fca02c788ba5dd79fbae83589"
|
||||||
|
}
|
||||||
|
]
|
||||||
|
}
|
||||||
|
}
|
||||||
Loading…
Add table
Reference in a new issue