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sphinx: Expose the shared secret creation function

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This commit is contained in:
Christian Decker
2020-03-02 19:39:16 +01:00
committed by Rusty Russell
parent 49a3321d7e
commit fd37c5b672
3 changed files with 37 additions and 11 deletions
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18
common/sphinx.c
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@@ -364,12 +364,12 @@ static bool blind_group_element(struct pubkey *blindedelement,
return true;
}
static bool create_shared_secret(struct secret *secret,
bool sphinx_create_shared_secret(struct secret *privkey,
const struct pubkey *pubkey,
const struct secret *session_key)
const struct secret *secret)
{
if (secp256k1_ecdh(secp256k1_ctx, secret->data, &pubkey->pubkey,
session_key->data, NULL, NULL) != 1)
if (secp256k1_ecdh(secp256k1_ctx, privkey->data, &pubkey->pubkey,
secret->data, NULL, NULL) != 1)
return false;
return true;
}
@@ -379,8 +379,8 @@ bool onion_shared_secret(
const struct onionpacket *packet,
const struct privkey *privkey)
{
return create_shared_secret(secret, &packet->ephemeralkey,
&privkey->secret);
return sphinx_create_shared_secret(secret, &packet->ephemeralkey,
&privkey->secret);
}
static void generate_key_set(const struct secret *secret,
@@ -408,8 +408,8 @@ static struct hop_params *generate_hop_params(
path->session_key->data) != 1)
return NULL;
if (!create_shared_secret(&params[0].secret, &path->hops[0].pubkey,
path->session_key))
if (!sphinx_create_shared_secret(
&params[0].secret, &path->hops[0].pubkey, path->session_key))
return NULL;
compute_blinding_factor(
@@ -491,7 +491,7 @@ static void sphinx_prefill(u8 *routinginfo, const struct sphinx_path *sp,
/* Now fill in the obfuscation stream, which can be regenerated by the
* node processing this onion. */
create_shared_secret(&shared_secret, sp->rendezvous_id, sp->session_key);
sphinx_create_shared_secret(&shared_secret, sp->rendezvous_id, sp->session_key);
sphinx_prefill_stream_xor(routinginfo + prefill_offset, prefill_size, &shared_secret);
}