59 lines
2.3 KiB
C
59 lines
2.3 KiB
C
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/* SPDX-License-Identifier: GPL-3.0-or-later
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*
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* Creates minimal Tox savedata for a given secret key, if provided, or a random key otherwise.
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* The data is written to stderr, human-readable key info is written to stdout.
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*
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* Build: gcc -o create_minimal_savedata create_minimal_savedata.c -lsodium -std=c99
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*
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* Usage: ./create_minimal_savedata [secret-key] 2>data
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*/
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#include <stdio.h>
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#include <sodium.h>
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#include "create_common.h"
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int main(const int argc, const char *const argv[])
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{
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init_sodium();
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unsigned char public_key[crypto_box_PUBLICKEYBYTES];
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unsigned char secret_key[crypto_box_SECRETKEYBYTES];
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handle_args(argc, argv, "Creates minimal Tox savedata", public_key, secret_key);
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print_keys(public_key, secret_key);
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// toxcore stores integers in savedata explicitly in little-endian, so this is indeed portable across architectures
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// 0x00000000 = (uint32_t) 0
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// 0x15ed1b1f = (uint32_t) STATE_COOKIE_GLOBAL
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// 0x00000044 = (uint32_t) (crypto_box_PUBLICKEYBYTES+crypto_box_SECRETKEYBYTES+sizeof(uint32_t))
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// 0x0001 = (uint16_t) STATE_TYPE_NOSPAMKEYS
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// 0x01ce = (uint16_t) STATE_COOKIE_TYPE
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// 0x00000000 = (uint32_t) nospam
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// _ = uint8_t[crypto_box_PUBLICKEYBYTES] public key
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// _ = uint8_t[crypto_box_SECRETKEYBYTES] secret key
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const char tox_file[] = "\x00\x00\x00\x00" \
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"\x1f\x1b\xed\x15" \
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"\x44\x00\x00\x00" \
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"\x01\x00" \
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"\xce\x01" \
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"\x00\x00\x00\x00";
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fwrite(tox_file, sizeof(tox_file) - 1, 1, stderr);
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fwrite(public_key, sizeof(public_key), 1, stderr);
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fwrite(secret_key, sizeof(secret_key), 1, stderr);
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unsigned char checksum[2] = {0};
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for (size_t i = 0; i < crypto_box_PUBLICKEYBYTES; i ++) {
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checksum[i % sizeof(checksum)] ^= public_key[i];
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}
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char checksum_str[sizeof(checksum) * 2 + 1];
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bin2hex_toupper(checksum_str, sizeof(checksum_str), checksum, sizeof(checksum));
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char public_key_str[crypto_box_PUBLICKEYBYTES * 2 + 1];
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bin2hex_toupper(public_key_str, sizeof(public_key_str), public_key, crypto_box_PUBLICKEYBYTES);
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fprintf(stdout, "Tox Id: %s00000000%s\n", public_key_str, checksum_str);
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return 0;
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}
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