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createinvoice: make a minimal blinded "path" in bolt12 invoice if none presented.

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The "path" is just a message to ourselves.  This meets the minimal
requirement for bolt12 invoices: that there be a blinded path (at
least so we can use the path_id inside in place of "payment_secret").

We expose the method to make this path_id to a common routine: offers
will need this for generating more sophisticated paths.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-11-09 12:57:04 +10:30
committed by Christian Decker
parent a5471a405b
commit 595fbd2a19
9 changed files with 155 additions and 1 deletions
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12
lightningd/hsm_control.c
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@@ -5,6 +5,7 @@
#include <common/errcode.h>
#include <common/hsm_encryption.h>
#include <common/hsm_version.h>
#include <common/invoice_path_id.h>
#include <common/json_command.h>
#include <common/json_param.h>
#include <common/jsonrpc_errors.h>
@@ -140,6 +141,17 @@ struct ext_key *hsm_init(struct lightningd *ld)
"HSM gave invalid v1 bolt12_base");
}
/* This is equivalent to makesecret("bolt12-invoice-base") */
msg = towire_hsmd_derive_secret(NULL, tal_dup_arr(tmpctx, u8,
(const u8 *)INVOICE_PATH_BASE_STRING,
strlen(INVOICE_PATH_BASE_STRING), 0));
if (!wire_sync_write(ld->hsm_fd, take(msg)))
err(EXITCODE_HSM_GENERIC_ERROR, "Writing derive_secret msg to hsm");
msg = wire_sync_read(tmpctx, ld->hsm_fd);
if (!fromwire_hsmd_derive_secret_reply(msg, &ld->invoicesecret_base))
err(EXITCODE_HSM_GENERIC_ERROR, "Bad derive_secret_reply");
return bip32_base;
}