mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 09:54:16 +01:00
97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
#include <common/bech32.h>
|
|
#include <common/json_helpers.h>
|
|
#include <common/jsonrpc_errors.h>
|
|
#include <common/param.h>
|
|
#include <common/type_to_string.h>
|
|
#include <common/utils.h>
|
|
#include <errno.h>
|
|
#include <gossipd/gen_gossip_wire.h>
|
|
#include <hsmd/gen_hsm_wire.h>
|
|
#include <string.h>
|
|
#include <wire/wire_sync.h>
|
|
|
|
/* These tables copied from zbase32 src:
|
|
* copyright 2002-2007 Zooko "Zooko" Wilcox-O'Hearn
|
|
* mailto:zooko@zooko.com
|
|
*
|
|
* Permission is hereby granted to any person obtaining a copy of this work to
|
|
* deal in this work without restriction (including the rights to use, modify,
|
|
* distribute, sublicense, and/or sell copies).
|
|
*/
|
|
static const char*const zbase32_chars="ybndrfg8ejkmcpqxot1uwisza345h769";
|
|
|
|
static const char *to_zbase32(const tal_t *ctx, const u8 *msg, size_t srclen)
|
|
{
|
|
size_t outlen;
|
|
char *out = tal_arr(ctx, char, (srclen * 8 + 4) / 5 + 1);
|
|
|
|
outlen = 0;
|
|
if (!bech32_convert_bits((uint8_t *)out, &outlen, 5, msg, srclen, 8, true))
|
|
return tal_free(out);
|
|
assert(outlen < tal_bytelen(out));
|
|
for (size_t i = 0; i < outlen; i++)
|
|
out[i] = zbase32_chars[(unsigned)out[i]];
|
|
out[outlen] = '\0';
|
|
return out;
|
|
}
|
|
|
|
static struct command_result *json_signmessage(struct command *cmd,
|
|
const char *buffer,
|
|
const jsmntok_t *obj UNNEEDED,
|
|
const jsmntok_t *params)
|
|
{
|
|
const char *message;
|
|
secp256k1_ecdsa_recoverable_signature rsig;
|
|
struct json_stream *response;
|
|
u8 sig[65], *msg;
|
|
int recid;
|
|
|
|
if (!param(cmd, buffer, params,
|
|
p_req("message", param_string, &message),
|
|
NULL))
|
|
return command_param_failed();
|
|
|
|
if (strlen(message) > 65535)
|
|
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
|
|
"Message must be < 64k");
|
|
|
|
msg = towire_hsm_sign_message(NULL,
|
|
tal_dup_arr(tmpctx, u8, (u8 *)message,
|
|
strlen(message), 0));
|
|
if (!wire_sync_write(cmd->ld->hsm_fd, take(msg)))
|
|
fatal("Could not write to HSM: %s", strerror(errno));
|
|
|
|
msg = wire_sync_read(tmpctx, cmd->ld->hsm_fd);
|
|
if (!fromwire_hsm_sign_message_reply(msg, &rsig))
|
|
fatal("HSM gave bad hsm_sign_message_reply %s",
|
|
tal_hex(msg, msg));
|
|
|
|
secp256k1_ecdsa_recoverable_signature_serialize_compact(secp256k1_ctx,
|
|
sig+1, &recid,
|
|
&rsig);
|
|
response = json_stream_success(cmd);
|
|
json_add_hex(response, "signature", sig+1, sizeof(sig)-1);
|
|
sig[0] = recid;
|
|
json_add_hex(response, "recid", sig, 1);
|
|
|
|
/* From https://twitter.com/rusty_twit/status/1182102005914800128:
|
|
* @roasbeef & @bitconner point out that #lnd algo is:
|
|
* zbase32(SigRec(SHA256(SHA256("Lightning Signed Message:" + msg)))).
|
|
* zbase32 from https://philzimmermann.com/docs/human-oriented-base-32-encoding.txt
|
|
* and SigRec has first byte 31 + recovery id, followed by 64 byte sig.
|
|
* #specinatweet */
|
|
sig[0] += 31;
|
|
json_add_string(response, "zbase",
|
|
to_zbase32(response, sig, sizeof(sig)));
|
|
return command_success(cmd, response);
|
|
}
|
|
|
|
static const struct json_command json_signmessage_cmd = {
|
|
"signmessage",
|
|
"utility",
|
|
json_signmessage,
|
|
"Create a digital signature of {message}",
|
|
};
|
|
AUTODATA(json_command, &json_signmessage_cmd);
|
|
|