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common/blindedpath: generalize construction routines.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-10-17 11:13:08 +10:30
parent 53e40c4380
commit c0ae2394d8
6 changed files with 50 additions and 20 deletions
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18
common/blindedpath.h
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@@ -9,6 +9,9 @@ struct route_info;
struct pubkey;
struct privkey;
struct secret;
struct short_channel_id;
struct tlv_encrypted_data_tlv_payment_constraints;
struct tlv_encrypted_data_tlv_payment_relay;
/**
* create_enctlv - Encrypt an encmsg to form an enctlv.
@@ -16,22 +19,31 @@ struct secret;
* @blinding: e(i), the blinding secret
* @node: the pubkey of the node to encrypt for
* @next_node: the pubkey of the next node, to place in enctlv
* @next_scid: the short_channel_id to the next node, to place in enctlv
* @padlen: if non-zero, the bytes of padding to add (also adds 2 byte padding hdr)
* @next_blinding_override: the optional blinding point to place in enctlv
* @payment_relay: optional payment_relay tlv
* @payment_constraints: optional payment_constraints tlv
* @allowed_features: optional allowed_features array
* @next_blinding: (out) e(i+1), the next blinding secret.
* @node_alias: (out) the blinded pubkey of the node to tell the recipient.
*
* Exactly one of next_node and next_scid must be non-NULL.
* Returns the enctlv blob, or NULL if the secret is invalid.
*/
u8 *create_enctlv(const tal_t *ctx,
const struct privkey *blinding,
const struct pubkey *node,
const struct pubkey *next_node,
const struct short_channel_id *next_scid,
size_t padlen,
const struct pubkey *next_blinding_override,
const struct tlv_encrypted_data_tlv_payment_relay *payment_relay TAKES,
const struct tlv_encrypted_data_tlv_payment_constraints *payment_constraints TAKES,
const u8 *allowed_features TAKES,
struct privkey *next_blinding,
struct pubkey *node_alias)
NON_NULL_ARGS(2, 3, 4, 7, 8);
NON_NULL_ARGS(2, 3, 11, 12);
/**
* create_final_enctlv - Encrypt an encmsg to form the final enctlv.
@@ -39,6 +51,7 @@ u8 *create_enctlv(const tal_t *ctx,
* @blinding: e(i), the blinding secret
* @final_node: the pubkey of the node to encrypt for
* @padlen: if non-zero, the bytes of padding to add (also adds 2 byte padding hdr)
* @allowed_features: optional allowed_features array
* @path_id: secret to include in enctlv, if not NULL.
* @node_alias: (out) the blinded pubkey of the node to tell the recipient.
*
@@ -49,8 +62,9 @@ u8 *create_final_enctlv(const tal_t *ctx,
const struct pubkey *final_node,
size_t padlen,
const struct secret *path_id,
const u8 *allowed_features TAKES,
struct pubkey *node_alias)
NON_NULL_ARGS(2, 3, 6);
NON_NULL_ARGS(2, 3, 7);
/**
* unblind_onion - tweak onion epheremeral key so we can decode it with ours.