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common/blindedpath: generalize routines.

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We're going to share them for onion messages as well as for blinded
payments.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-10-17 11:13:07 +10:30
parent 85baca56c6
commit 53e40c4380
5 changed files with 181 additions and 151 deletions
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51
common/blindedpath.h
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@@ -68,41 +68,38 @@ bool unblind_onion(const struct pubkey *blinding,
NO_NULL_ARGS;
/**
* decrypt_enctlv - Decrypt an encmsg to form an enctlv.
* @blinding: E(i), the blinding pubkey the previous peer gave us.
* @ss: the blinding secret from unblind_onion().
* @enctlv: the enctlv from the onion (tal, may be NULL).
* @next_node: (out) the next node_id.
* @next_blinding: (out) the next blinding E(i+1).
* blindedpath_get_alias - tweak our id to see alias they used.
* @ss: the shared secret from unblind_onion
* @my_id: my node_id
* @alias: (out) the alias.
*
* Returns false if decryption failed or encmsg was malformed.
* Returns false on ECDH fail.
*/
bool decrypt_enctlv(const struct pubkey *blinding,
const struct secret *ss,
const u8 *enctlv,
struct pubkey *next_node,
struct pubkey *next_blinding)
NON_NULL_ARGS(1, 2, 4, 5);
bool blindedpath_get_alias(const struct secret *ss,
const struct pubkey *my_id,
struct pubkey *alias);
/**
* decrypt_final_enctlv - Decrypt an encmsg to form an enctlv.
* @ctx: tal context for @path_id
* decrypt_encrypted_data - Decrypt an encmsg to form an tlv_encrypted_data_tlv.
* @ctx: the context to allocate off.
* @blinding: E(i), the blinding pubkey the previous peer gave us.
* @ss: the blinding secret from unblind_onion().
* @enctlv: the enctlv from the onion (tal, may be NULL).
* @my_id: the pubkey of this node.
* @alias: (out) the node_id this was addressed to.
* @path_id: (out) the secret contained in the enctlv, if any (NULL if invalid or unset)
*
* Returns false if decryption failed or encmsg was malformed.
* Returns NULL if decryption failed or encmsg was malformed.
*/
bool decrypt_final_enctlv(const tal_t *ctx,
const struct pubkey *blinding,
const struct secret *ss,
const u8 *enctlv,
const struct pubkey *my_id,
struct pubkey *alias,
struct secret **path_id)
NON_NULL_ARGS(1, 2, 4, 5);
struct tlv_encrypted_data_tlv *decrypt_encrypted_data(const tal_t *ctx,
const struct pubkey *blinding,
const struct secret *ss,
const u8 *enctlv)
NON_NULL_ARGS(2, 3);
/**
* blindedpath_next_blinding - Calculate or extract next blinding pubkey
*/
void blindedpath_next_blinding(const struct tlv_encrypted_data_tlv *enc,
const struct pubkey *blinding,
const struct secret *ss,
struct pubkey *next_blinding);
#endif /* LIGHTNING_COMMON_BLINDEDPATH_H */