88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
#ifndef LIGHTNING_COMMON_BLINDEDPATH_H
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#define LIGHTNING_COMMON_BLINDEDPATH_H
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#include "config.h"
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#include <ccan/compiler/compiler.h>
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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struct route_info;
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struct pubkey;
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struct privkey;
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struct secret;
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struct short_channel_id;
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struct tlv_encrypted_data_tlv;
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struct tlv_encrypted_data_tlv_payment_constraints;
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struct tlv_encrypted_data_tlv_payment_relay;
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/**
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* encrypt_tlv_encrypted_data - Encrypt a tlv_encrypted_data_tlv.
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* @ctx: tal context
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* @blinding: e(i), the blinding secret
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* @node: the pubkey of the node to encrypt for
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* @tlv: the message to encrypt.
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* @next_blinding: (out) e(i+1), the next blinding secret (optional)
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* @node_alias: (out) the blinded pubkey of the node to tell the recipient.
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*
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* You create a blinding secret using randombytes_buf(), then call this
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* iteratively for each node in the path.
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*/
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u8 *encrypt_tlv_encrypted_data(const tal_t *ctx,
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const struct privkey *blinding,
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const struct pubkey *node,
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const struct tlv_encrypted_data_tlv *tlv,
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struct privkey *next_blinding,
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struct pubkey *node_alias)
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NON_NULL_ARGS(2, 3, 4, 6);
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/**
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* unblind_onion - tweak onion epheremeral key so we can decode it with ours.
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* @blinding: E(i), the blinding pubkey the previous peer gave us.
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* @ecdh: the ecdh routine (usually ecdh from common/ecdh_hsmd).
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* @onion_key: (in, out) the onionpacket->ephemeralkey to tweak.
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* @ss: (out) the shared secret we gained from blinding pubkey.
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*
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* The shared secret is needed to decrypt the enctlv we expect to find, too.
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*/
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bool unblind_onion(const struct pubkey *blinding,
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void (*ecdh)(const struct pubkey *point, struct secret *ss),
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struct pubkey *onion_key,
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struct secret *ss)
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NO_NULL_ARGS;
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/**
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* blindedpath_get_alias - tweak our id to see alias they used.
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* @ss: the shared secret from unblind_onion
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* @my_id: my node_id
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* @alias: (out) the alias.
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*
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* Returns false on ECDH fail.
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*/
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bool blindedpath_get_alias(const struct secret *ss,
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const struct pubkey *my_id,
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struct pubkey *alias);
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/**
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* decrypt_encrypted_data - Decrypt an encmsg to form an tlv_encrypted_data_tlv.
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* @ctx: the context to allocate off.
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* @blinding: E(i), the blinding pubkey the previous peer gave us.
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* @ss: the blinding secret from unblind_onion().
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* @enctlv: the enctlv from the onion (tal, may be NULL).
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*
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* Returns NULL if decryption failed or encmsg was malformed.
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*/
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struct tlv_encrypted_data_tlv *decrypt_encrypted_data(const tal_t *ctx,
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const struct pubkey *blinding,
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const struct secret *ss,
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const u8 *enctlv)
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NON_NULL_ARGS(2, 3);
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/**
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* blindedpath_next_blinding - Calculate or extract next blinding pubkey
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*/
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void blindedpath_next_blinding(const struct tlv_encrypted_data_tlv *enc,
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const struct pubkey *blinding,
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const struct secret *ss,
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struct pubkey *next_blinding);
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#endif /* LIGHTNING_COMMON_BLINDEDPATH_H */
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