tools/hsmtool: Add getcodexsecret to get the hsm_secret in bip93

tools/Makefile

@@ -18,7 +18,7 @@ tools/headerversions: $(FORCE) tools/headerversions.o libccan.a
 tools/headerversions.o: ccan/config.h
 tools/check-bolt: tools/check-bolt.o $(TOOLS_COMMON_OBJS)
 
-tools/hsmtool: tools/hsmtool.o $(TOOLS_COMMON_OBJS) $(BITCOIN_OBJS) common/amount.o common/autodata.o common/bech32.o common/bigsize.o common/configdir.o common/configvar.o common/derive_basepoints.o common/descriptor_checksum.o common/hsm_encryption.o common/node_id.o common/type_to_string.o common/version.o wire/fromwire.o wire/towire.o
+tools/hsmtool: tools/hsmtool.o $(TOOLS_COMMON_OBJS) $(BITCOIN_OBJS) common/amount.o common/autodata.o common/bech32.o common/bigsize.o common/codex32.o common/configdir.o common/configvar.o common/derive_basepoints.o common/descriptor_checksum.o common/hsm_encryption.o common/node_id.o common/type_to_string.o common/version.o wire/fromwire.o wire/towire.o
 
 tools/lightning-hsmtool: tools/hsmtool
 	cp $< $@

tools/hsmtool.c

@@ -9,6 +9,7 @@
 #include <ccan/tal/path/path.h>
 #include <ccan/tal/str/str.h>
 #include <common/bech32.h>
+#include <common/codex32.h>
 #include <common/configdir.h>
 #include <common/derive_basepoints.h>
 #include <common/descriptor_checksum.h>
@@ -44,6 +45,7 @@ static void show_usage(const char *progname)
 	printf("	- checkhsm <path/to/new/hsm_secret>\n");
 	printf("	- dumponchaindescriptors <path/to/hsm_secret> [network]\n");
 	printf("	- makerune <path/to/hsm_secret>\n");
+	printf("	- getcodexsecret <path/to/hsm_secret> <id> <threshold>\n");
 	exit(0);
 }
 
@@ -244,6 +246,17 @@ static int decrypt_hsm(const char *hsm_secret_path)
 	return 0;
 }
 
+static int make_codexsecret(const char *hsm_secret_path,
+			    const char *id,
+			    const u32 threshold)
+{
+	struct secret hsm_secret;
+	get_hsm_secret(&hsm_secret, hsm_secret_path);
+	printf("Codex32 Secret of your hsm_secret is: %s\n",
+		codex32_secret_encode(tmpctx, id, threshold, hsm_secret.data, 32));
+	return 0;
+}
+
 static int encrypt_hsm(const char *hsm_secret_path)
 {
 	int fd;
@@ -745,5 +758,10 @@ int main(int argc, char *argv[])
 		return make_rune(argv[2]);
 	}
 
+	if(streq(method, "getcodexsecret")) {
+		if (argc < 3)
+			show_usage(argv[0]);
+		return make_codexsecret(argv[2], argv[3], atol(argv[4]));
+	}
 	show_usage(argv[0]);
 }