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