67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/* Encapsulation for pubkeys used as node ids: more compact, more dangerous. */
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#ifndef LIGHTNING_COMMON_NODE_ID_H
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#define LIGHTNING_COMMON_NODE_ID_H
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#include "config.h"
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#include <bitcoin/pubkey.h>
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#include <ccan/crypto/siphash24/siphash24.h>
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#include <ccan/htable/htable_type.h>
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#include <common/pseudorand.h>
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struct node_id {
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u8 k[PUBKEY_CMPR_LEN];
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};
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static inline bool node_id_eq(const struct node_id *a,
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const struct node_id *b)
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{
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return memcmp(a->k, b->k, sizeof(a->k)) == 0;
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}
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/* Is this actually a valid pubkey? Relatively expensive. */
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bool node_id_valid(const struct node_id *id);
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/* Convert from pubkey to compressed pubkey. */
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void node_id_from_pubkey(struct node_id *id, const struct pubkey *key);
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/* Returns false if not a valid pubkey: relatively expensive */
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WARN_UNUSED_RESULT
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bool pubkey_from_node_id(struct pubkey *key, const struct node_id *id);
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/* Convert to hex string of SEC1 encoding. */
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char *node_id_to_hexstr(const tal_t *ctx, const struct node_id *id);
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/* Convert from hex string of SEC1 encoding: checks validity! */
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bool node_id_from_hexstr(const char *str, size_t slen, struct node_id *id);
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/* Compare the keys `a` and `b`. Return <0 if `a`<`b`, 0 if equal and >0 otherwise */
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int node_id_cmp(const struct node_id *a, const struct node_id *b);
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/* If the two nodes[] are id1 and id2, which index would id1 be? */
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static inline int node_id_idx(const struct node_id *id1,
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const struct node_id *id2)
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{
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return node_id_cmp(id1, id2) > 0;
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}
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/* marshal/unmarshal functions */
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void towire_node_id(u8 **pptr, const struct node_id *id);
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void fromwire_node_id(const u8 **cursor, size_t *max, struct node_id *id);
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/* Hash table functions for node ids */
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static inline const struct node_id *node_id_keyof(const struct node_id *id)
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{
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return id;
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}
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/* We need to define a hashing function. siphash24 is a fast yet
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* cryptographic hash in ccan/crypto/siphash24; we might be able to get away
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* with a slightly faster hash with fewer guarantees, but it's good hygiene to
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* use this unless it's a proven bottleneck. siphash_seed() is a function in
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* common/pseudorand which sets up a seed for our hashing; it's different
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* every time the program is run. */
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static inline size_t node_id_hash(const struct node_id *id)
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{
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return siphash24(siphash_seed(), id->k, sizeof(id->k));
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}
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#endif /* LIGHTNING_COMMON_NODE_ID_H */
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