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[Security] Use a CSPRNG for salts, tokens, and RNG seeding

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Password salts and activation tokens were generated with the global SFMT
RNG, which was seeded from a 32-bit timestamp, making registration
salts and activation tokens predictable. The game RNG used the same
timestamp seed across restarts.

Add CryptoUtil backed by OpenSSL RAND_bytes and use it for salt/token
generation and to seed RNG_SFMT with a 64-bit CSPRNG value in both the
client and server. Link libcockatrice_utility against OpenSSL::Crypto.

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Took 25 minutes
This commit is contained in:
Lukas Brübach 2026-08-04 10:02:35 +02:00 • committed by GitHub
parent 68e4fa054d
commit fd865c1ea9
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GPG key ID: B5690EEEBB952194
19 changed files with 108 additions and 37 deletions
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3
cockatrice/src/main.cpp
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@ -53,6 +53,7 @@
#include <libcockatrice/settings/interface_settings.h>
#include <libcockatrice/settings/network_settings.h>
#include <libcockatrice/settings/personal_settings.h>
#include <libcockatrice/utility/cryptoutil.h>
QTranslator *translator, *qtTranslator;
RNG_Abstract *rng;
@ -292,7 +293,7 @@ int main(int argc, char *argv[])
}
}
rng = new RNG_SFMT;
rng = new RNG_SFMT(CryptoUtil::randomUInt64());
themeManager = new ThemeManager;
soundEngine = new SoundEngine;