mirror of
https://github.com/polhenarejos/pico-hsm.git
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122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/*
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* random.c -- get random bytes
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*
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* Copyright (C) 2010, 2011, 2012, 2013, 2015
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* Free Software Initiative of Japan
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* Author: NIIBE Yutaka <gniibe@fsij.org>
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*
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* This file is a part of Gnuk, a GnuPG USB Token implementation.
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*
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* Gnuk is free software: you can redistribute it and/or modify it
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* 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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*
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* Gnuk is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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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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*/
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#include <stdint.h>
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#include <string.h>
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#include "gnuk.h"
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#include "neug.h"
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#define RANDOM_BYTES_LENGTH 32
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static uint32_t random_word[RANDOM_BYTES_LENGTH/sizeof (uint32_t)];
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void random_init (void)
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{
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int i;
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neug_init (random_word, RANDOM_BYTES_LENGTH/sizeof (uint32_t));
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for (i = 0; i < NEUG_PRE_LOOP; i++)
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neug_get (NEUG_KICK_FILLING);
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}
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void random_fini (void)
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{
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neug_fini ();
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}
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/*
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* Return pointer to random 32-byte
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*/
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void random_bytes_free (const uint8_t *p);
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const uint8_t * random_bytes_get (size_t len)
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{
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static uint32_t return_word[512/sizeof(uint32_t)];
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for (int ix = 0; ix < len; ix += RANDOM_BYTES_LENGTH) {
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neug_wait_full ();
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memcpy(return_word+ix/sizeof(uint32_t), random_word, RANDOM_BYTES_LENGTH);
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random_bytes_free((const uint8_t *)random_word);
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}
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return (const uint8_t *)return_word;
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}
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/*
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* Free pointer to random 32-byte
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*/
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void random_bytes_free (const uint8_t *p)
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{
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(void)p;
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memset (random_word, 0, RANDOM_BYTES_LENGTH);
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neug_flush ();
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}
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/*
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* Return 4-byte salt
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*/
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void random_get_salt (uint8_t *p)
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{
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uint32_t rnd;
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rnd = neug_get (NEUG_KICK_FILLING);
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memcpy (p, &rnd, sizeof (uint32_t));
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rnd = neug_get (NEUG_KICK_FILLING);
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memcpy (p + sizeof (uint32_t), &rnd, sizeof (uint32_t));
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}
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/*
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* Random byte iterator
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*/
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int random_gen (void *arg, unsigned char *out, size_t out_len)
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{
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uint8_t *index_p = (uint8_t *)arg;
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uint8_t index = index_p ? *index_p : 0;
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size_t n;
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while (out_len)
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{
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neug_wait_full ();
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n = RANDOM_BYTES_LENGTH - index;
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if (n > out_len)
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n = out_len;
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memcpy (out, ((unsigned char *)random_word) + index, n);
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out += n;
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out_len -= n;
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index += n;
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if (index >= RANDOM_BYTES_LENGTH)
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{
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index = 0;
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neug_flush ();
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}
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}
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if (index_p)
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*index_p = index;
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return 0;
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}
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