Add minimal save generator

3 files changed, 79 insertions, 7 deletions

diff --git a/INSTALL.md b/INSTALL.md
index 0e4d19b5..a6a75c02 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -45,13 +45,15 @@ This repository, although called `toxcore`, in fact contains several libraries b
 
 There are some programs that are not plugged into the CMake build system which you might find interesting. You would need to build those programs yourself. These programs reside in [`other/fun`](other/fun) directory.
 
-| Name                  | Type       | Dependencies         | Platform       | Description                                                                                                                                                            |
-|-----------------------|------------|----------------------|----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| `bootstrap_node_info` | Script     | python3              | Cross-platform | Script for getting version and Message Of The Day (MOTD) information from a DHT bootstrap node.                                                                        |
-| `cracker`             | Executable | libnacl or libsodium | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which starts with the specified byte sequence.                                            |
-| `strkey`              | Executable | libsodium            | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which contains a specified byte pattern at the specified position or at any position.     |
-| `make-funny-savefile` | Script     | python               | Cross-platform | Generates Tox profile file (savedata file) with provided key pair. Useful for generating Tox profiles from the output of cracker or strkey programs.                   |
-| `sign`                | Executable | libsodium            | Cross-platform | Program for ed25519 file signing.                                                                                                                                      |
+| Name                     | Type       | Dependencies         | Platform       | Description                                                                                                                                                            |
+|--------------------------|------------|----------------------|----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `bootstrap_node_info`    | Script     | python3              | Cross-platform | Prints version and Message Of The Day (MOTD) information of a specified DHT bootstrap node.                                                                            |
+| `cracker`                | Executable | libnacl or libsodium | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which starts with a specified byte sequence.                                              |
+| `make-funny-savefile`    | Script     | python               | Cross-platform | Generates a Tox profile file (savedata file) with the provided key pair. Useful for generating Tox profiles from the output of cracker or strkey programs.             |
+| `minimal-save-generator` | Executable | libsodium            | Cross-platform | Generates a minimal Tox profile file (savedata file) with a random key pair.                                                                                           |
+| `save-generator`         | Executable | libtoxcore           | Cross-platform | Generates a Tox profile file (savedata file) with a random key pair using libtoxcore. Allows setting a name and adding friends.                                        |
+| `sign`                   | Executable | libsodium            | Cross-platform | Signs a file with a ed25519 key.                                                                                                                                       |
+| `strkey`                 | Executable | libsodium            | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which contains a specified byte pattern at a specified position or at any position.       |
 
 ## Building
 
diff --git a/other/fun/BUILD.bazel b/other/fun/BUILD.bazel
index 584c2a83..ae4cfb2f 100644
--- a/other/fun/BUILD.bazel
+++ b/other/fun/BUILD.bazel
@@ -8,6 +8,14 @@ cc_binary(
         "@libsodium",
     ],
 )
+cc_binary(
+    name = "minimal-save-generator",
+    srcs = ["minimal-save-generator.c"],
+    deps = [
+        "@libsodium",
+    ],
+)
+
 
 cc_binary(
     name = "sign",
diff --git a/other/fun/minimal-save-generator.c b/other/fun/minimal-save-generator.c
new file mode 100644
index 00000000..b4833ea8
--- /dev/null
+++ b/other/fun/minimal-save-generator.c
@@ -0,0 +1,62 @@
+/* minimal-save-generator -- Minimal Save Generator
+ *
+ * Generates a minimal Tox savedata file that can be used in clients.
+ * Prints the savedata file to stderr, prints information to stdout.
+ *
+ * Requires sodium library.
+ *
+ * Usage: minimal-save-generator 2> profile.tox
+ *
+ * Compile: gcc minimal-save-generator.c -o minimal-save-generator -lsodium
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <sodium.h>
+
+int main(void)
+{
+    unsigned char public_key[crypto_box_PUBLICKEYBYTES];
+    unsigned char secret_key[crypto_box_SECRETKEYBYTES];
+    crypto_box_keypair(public_key, secret_key);
+
+    // print new tox savedata to stderr
+    char tox_file[] = "\x00\x00\x00\x00\x1f\x1b\xed\x15\x44\x00\x00\x00\x01\x00\xce\x01\x00\x00\x00\x00";
+    fwrite(tox_file, sizeof(tox_file) - 1, 1, stderr);
+    fwrite(public_key, sizeof(public_key), 1, stderr);
+    fwrite(secret_key, sizeof(secret_key), 1, stderr);
+
+    // print info on it to stdout
+    char public_key_str[crypto_box_PUBLICKEYBYTES * 2 + 1];
+    char secret_key_str[crypto_box_SECRETKEYBYTES * 2 + 1];
+    sodium_bin2hex(public_key_str, sizeof(public_key_str), public_key, sizeof(public_key));
+    sodium_bin2hex(secret_key_str, sizeof(secret_key_str), secret_key, sizeof(secret_key));
+
+    for (size_t i = 0; i < sizeof(public_key_str); i ++) {
+        public_key_str[i] = toupper(public_key_str[i]);
+        secret_key_str[i] = toupper(secret_key_str[i]);
+    }
+
+    fprintf(stdout, "Public key: %s\n", public_key_str);
+    fprintf(stdout, "Secret key: %s\n", secret_key_str);
+
+    // calculate checksum for tox id printing
+    unsigned char checksum[2] = {0};
+
+    for (size_t i = 0; i < crypto_box_PUBLICKEYBYTES; i ++) {
+        checksum[i % 2] ^= public_key[i];
+    }
+
+    char checksum_str[sizeof(checksum) * 2 + 1];
+    sodium_bin2hex(checksum_str, sizeof(checksum_str), checksum, sizeof(checksum));
+
+    for (size_t i = 0; i < sizeof(checksum_str); i ++) {
+        checksum_str[i] = toupper(checksum_str[i]);
+    }
+
+    fprintf(stdout, "Tox Id: %s00000000%s\n", public_key_str, checksum_str);
+
+    return 0;
+}