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source/ps/Hashing.cpp
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/* Copyright (C) 2021 Wildfire Games. | |||||
* This file is part of 0 A.D. | |||||
* | |||||
* 0 A.D. is free software: you can redistribute it and/or modify | |||||
* it under the terms of the GNU General Public License as published by | |||||
* the Free Software Foundation, either version 2 of the License, or | |||||
* (at your option) any later version. | |||||
* | |||||
* 0 A.D. is distributed in the hope that it will be useful, | |||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |||||
* GNU General Public License for more details. | |||||
* | |||||
* You should have received a copy of the GNU General Public License | |||||
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>. | |||||
*/ | |||||
#include "precompiled.h" | |||||
#include "ps/CStr.h" | |||||
#include "ps/Util.h" | |||||
#include <sodium.h> | |||||
CStr8 HashCryptographically(const CStr8& string, const CStr8& salt) | |||||
{ | |||||
if (string.empty()) | |||||
return string; | |||||
ENSURE(sodium_init() >= 0); | |||||
constexpr int SALTSIZE = crypto_pwhash_SALTBYTES; | |||||
static_assert(SALTSIZE >= crypto_generichash_BYTES_MIN); | |||||
static_assert(SALTSIZE <= crypto_generichash_BYTES_MAX); | |||||
static_assert(SALTSIZE >= crypto_generichash_KEYBYTES_MIN); | |||||
static_assert(SALTSIZE <= crypto_generichash_KEYBYTES_MAX); | |||||
// First generate a fixed-size salt from out variable-sized one (libsodium requires it). | |||||
unsigned char salt_buffer[SALTSIZE] = { | |||||
235, 82, 29, 20, 135, 168, 184, 97, 7, 240, 48, 109, 8, 34, 158, 32, | |||||
}; | |||||
crypto_generichash_state state; | |||||
crypto_generichash_init(&state, salt_buffer, SALTSIZE, SALTSIZE); | |||||
crypto_generichash_update(&state, reinterpret_cast<const unsigned char*>(salt.c_str()), salt.size()); | |||||
crypto_generichash_final(&state, salt_buffer, SALTSIZE); | |||||
constexpr int HASHSIZE = 32; | |||||
static_assert(HASHSIZE >= crypto_pwhash_BYTES_MIN); | |||||
static_assert(HASHSIZE <= crypto_pwhash_BYTES_MAX); | |||||
// Now that we have a fixed-length key, use that to hash the password. | |||||
unsigned char output[HASHSIZE] = { 0 }; | |||||
// For HashCryptographically, we use 'fast' parameters, corresponding to low values. | |||||
// These parameters must not change, or hashes will change, hence why the #defined values are copied. | |||||
constexpr size_t memLimit = 8192 * 4; // 4 * crypto_pwhash_argon2id_MEMLIMIT_MIN | |||||
constexpr size_t opsLimit = 2; // crypto_pwhash_argon2id_OPSLIMIT_INTERACTIVE | |||||
ENSURE(crypto_pwhash(output, HASHSIZE, string.c_str(), string.size(), salt_buffer, opsLimit, memLimit, crypto_pwhash_ALG_ARGON2ID13) == 0); | |||||
return CStr(Hexify(output, HASHSIZE)).UpperCase(); | |||||
} |
Wildfire Games · Phabricator