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bf52ab7d29
Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
60 lines
1.9 KiB
C
60 lines
1.9 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/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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_PUBLIC_ void generate_random_buffer(uint8_t *out, int len)
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{
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/* Thread and fork safe random number generator for temporary keys. */
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gnutls_rnd(GNUTLS_RND_RANDOM, out, len);
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}
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_PUBLIC_ void generate_secret_buffer(uint8_t *out, int len)
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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 mixes data obtained
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* from the OS random device with the previous key.
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*/
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gnutls_rnd(GNUTLS_RND_KEY, out, len);
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}
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_PUBLIC_ void generate_nonce_buffer(uint8_t *out, int len)
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{
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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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gnutls_rnd(GNUTLS_RND_NONCE, out, len);
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}
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