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daemon: dev-rhash command.

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Useful for creating SHA256(r) from scripts.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2016-01-22 06:45:27 +10:30
parent 8f0e10309a
commit 5acb3c9848
1 changed files with 42 additions and 0 deletions
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42
daemon/jsonrpc.c
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@@ -7,6 +7,7 @@
#include <ccan/array_size/array_size.h>
#include <ccan/err/err.h>
#include <ccan/io/io.h>
#include <ccan/str/hex/hex.h>
#include <ccan/tal/str/str.h>
#include <errno.h>
#include <fcntl.h>
@@ -191,6 +192,46 @@ static const struct json_command getlog_command = {
"Returns log array"
};
static void json_rhash(struct command *cmd,
const char *buffer, const jsmntok_t *params)
{
struct json_result *response = new_json_result(cmd);
jsmntok_t *secrettok;
struct sha256 secret;
json_get_params(buffer, params,
"secret", &secrettok,
NULL);
if (!secrettok) {
command_fail(cmd, "Need secret");
return;
}
if (!hex_decode(buffer + secrettok->start,
secrettok->end - secrettok->start,
&secret, sizeof(secret))) {
command_fail(cmd, "'%.*s' is not a valid 32-byte hex value",
(int)(secrettok->end - secrettok->start),
buffer + secrettok->start);
return;
}
/* Hash in place. */
sha256(&secret, &secret, sizeof(secret));
json_object_start(response, NULL);
json_add_hex(response, "rhash", &secret, sizeof(secret));
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command rhash_command = {
"dev-rhash",
json_rhash,
"SHA256 of {secret}",
"Returns a hash value"
};
static const struct json_command *cmdlist[] = {
&help_command,
&stop_command,
@@ -199,6 +240,7 @@ static const struct json_command *cmdlist[] = {
&getpeers_command,
/* Developer/debugging options. */
&echo_command,
&rhash_command,
};
static void json_help(struct command *cmd,