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lightningd: add checkmessage JSON command.

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I wanted to call it verifymessage, but then I read the LND API for that
and wanted nothing to do with it!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-10-12 15:43:10 +10:30 • committed by neil saitug
parent b81ed5be86
commit 1f0b86e575
2 changed files with 87 additions and 1 deletions
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2
CHANGELOG.md
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@ -15,7 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- JSON API: `listfunds` now lists a blockheight for confirmed transactions, and has `connected` and `state` fields for channels, like `listpeers`.
- JSON API: `fundchannel_start` now includes field `scriptpubkey`
- JSON API: New method `listtransactions`
- JSON API: `signmessage` will now create a signature from your node on a message.
- JSON API: `signmessage` will now create a signature from your node on a message; `checkmessage` will verify it.
- Plugin: new notifications `sendpay_success` and `sendpay_failure`.
- Protocol: nodes now announce features in `node_announcement` broadcasts.
- Protocol: we now offer `option_gossip_queries_ex` for finegrained gossip control.

86
lightningd/signmessage.c
View file

@ -1,4 +1,5 @@
#include <common/bech32.h>
#include <common/hash_u5.h>
#include <common/json_helpers.h>
#include <common/jsonrpc_errors.h>
#include <common/param.h>
@ -20,6 +21,9 @@
*/
static const char*const zbase32_chars="ybndrfg8ejkmcpqxot1uwisza345h769";
/* revchars: index into this table with the ASCII value of the char. The result is the value of that quintet. */
static const u8 zbase32_revchars[]={ 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 18, 255, 25, 26, 27, 30, 29, 7, 31, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 24, 1, 12, 3, 8, 5, 6, 28, 21, 9, 10, 255, 11, 2, 16, 13, 14, 4, 22, 17, 19, 255, 20, 15, 0, 23, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, };
static const char *to_zbase32(const tal_t *ctx, const u8 *msg, size_t srclen)
{
size_t outlen;
@ -35,6 +39,28 @@ static const char *to_zbase32(const tal_t *ctx, const u8 *msg, size_t srclen)
return out;
}
static const u8 *from_zbase32(const tal_t *ctx, const char *msg)
{
u5 *u5arr;
u8 *u8arr;
size_t len;
u5arr = tal_arr(tmpctx, u5, strlen(msg));
for (size_t i = 0; i < tal_bytelen(u5arr); i++) {
u5arr[i] = zbase32_revchars[(unsigned char)msg[i]];
if (u5arr[i] > 31)
return NULL;
}
u8arr = tal_arr(ctx, u8, (tal_bytelen(u5arr) * 5 + 7) / 8);
len = 0;
if (!bech32_convert_bits(u8arr, &len, 8,
u5arr, tal_bytelen(u5arr), 5, false))
return tal_free(u8arr);
assert(len == tal_bytelen(u8arr));
return u8arr;
}
static struct command_result *json_signmessage(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
@ -94,3 +120,63 @@ static const struct json_command json_signmessage_cmd = {
};
AUTODATA(json_command, &json_signmessage_cmd);
static struct command_result *json_checkmessage(struct command *cmd,
const char *buffer,
const jsmntok_t *obj UNNEEDED,
const jsmntok_t *params)
{
struct pubkey *pubkey, reckey;
const u8 *u8sig;
const char *message, *zb;
secp256k1_ecdsa_recoverable_signature rsig;
struct sha256_ctx sctx = SHA256_INIT;
struct sha256_double shad;
struct json_stream *response;
if (!param(cmd, buffer, params,
p_req("message", param_string, &message),
p_req("zbase", param_string, &zb),
p_req("pubkey", param_pubkey, &pubkey),
NULL))
return command_param_failed();
u8sig = from_zbase32(tmpctx, zb);
if (!u8sig)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"zbase is not valid zbase32");
if (tal_bytelen(u8sig) != 65)
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"zbase is too %s",
tal_bytelen(u8sig) < 65 ? "short" : "long");
if (!secp256k1_ecdsa_recoverable_signature_parse_compact(secp256k1_ctx,
&rsig,
u8sig + 1,
u8sig[0] - 31))
return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
"cannot parse zbase signature");
sha256_update(&sctx, "Lightning Signed Message:",
strlen("Lightning Signed Message:"));
sha256_update(&sctx, message, strlen(message));
sha256_double_done(&sctx, &shad);
response = json_stream_success(cmd);
if (!secp256k1_ecdsa_recover(secp256k1_ctx, &reckey.pubkey, &rsig,
shad.sha.u.u8)) {
json_add_bool(response, "verified", false);
} else {
json_add_bool(response, "verified", pubkey_eq(pubkey, &reckey));
}
return command_success(cmd, response);
}
static const struct json_command json_checkmessage_cmd = {
"checkmessage",
"utility",
json_checkmessage,
"Verify a digital signature {zbase} of {message} signed with {pubkey}",
};
AUTODATA(json_command, &json_checkmessage_cmd);