109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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* This file is part of the Pico CCID distribution (https://github.com/polhenarejos/pico-ccid).
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* Copyright (c) 2022 Pol Henarejos.
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*
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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, version 3.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public 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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#include <stdint.h>
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#include <string.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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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();
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}
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void random_fini(void) {
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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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#define MAX_RANDOM_BUFFER 1024
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const uint8_t * random_bytes_get(size_t len) {
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if (len > MAX_RANDOM_BUFFER)
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return NULL;
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static uint32_t return_word[MAX_RANDOM_BUFFER/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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(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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uint32_t rnd;
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rnd = neug_get();
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memcpy(p, &rnd, sizeof (uint32_t));
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rnd = neug_get();
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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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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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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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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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