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cea9b25571
Prefer 'size_t' over 'int' in generate_random_buffer(), generate_secret_buffer() and generate_nonce_buffer() to match an underlying gnutls_rnd() calls. Signed-off-by: Dmitry Antipov <dantipov@cloudlinux.com> Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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Functions to create reasonable random numbers for crypto use.
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Copyright (C) Jeremy Allison 2001
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "lib/util/fault.h"
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#include "lib/util/genrand.h"
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#include <gnutls/gnutls.h>
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#include <gnutls/crypto.h>
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/*
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* Details about the GnuTLS CSPRNG:
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*
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* https://nikmav.blogspot.com/2017/03/improving-by-simplifying-gnutls-prng.html
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*/
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_NORETURN_ static void genrand_panic(int err,
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const char *location,
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const char *func)
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{
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char buf[200];
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snprintf(buf, sizeof(buf),
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"%s:%s: GnuTLS could not generate a random buffer: %s [%d]\n",
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location, func, gnutls_strerror_name(err), err);
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smb_panic(buf);
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}
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_PUBLIC_ void generate_random_buffer(uint8_t *out, size_t len)
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{
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/* Random number generator for temporary keys. */
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int ret = gnutls_rnd(GNUTLS_RND_RANDOM, out, len);
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if (ret != 0) {
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genrand_panic(ret, __location__, __func__);
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}
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}
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_PUBLIC_ void generate_secret_buffer(uint8_t *out, size_t len)
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{
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/*
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* Random number generator for long term keys.
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*
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* The key generator, will re-seed after a fixed amount of bytes is
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* generated (typically less than the nonce), and will also re-seed
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* based on time, i.e., after few hours of operation without reaching
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* the limit for a re-seed. For its re-seed it mixes data obtained
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* from the OS random device with the previous key.
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*/
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int ret = gnutls_rnd(GNUTLS_RND_KEY, out, len);
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if (ret != 0) {
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genrand_panic(ret, __location__, __func__);
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}
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}
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_PUBLIC_ void generate_nonce_buffer(uint8_t *out, size_t len)
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{
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/*
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* Random number generator for nonce and initialization vectors.
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*
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* The nonce generator will reseed after outputting a fixed amount of
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* bytes (typically few megabytes), or after few hours of operation
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* without reaching the limit has passed.
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*/
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int ret = gnutls_rnd(GNUTLS_RND_NONCE, out, len);
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if (ret != 0) {
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genrand_panic(ret, __location__, __func__);
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}
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}
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