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Crypto.c
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Crypto.c
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/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "crypto/Crypto.h"
#include "memory/Allocator.h"
#include "memory/BufferAllocator.h"
#include "util/Assert.h"
#include "util/Base32.h"
#include <stdio.h>
#include <event2/util.h>
/** @see Crypto.h */
void Crypto_init()
{
if (evutil_secure_rng_init() != 0) {
fprintf(stderr, "Unable to initialize secure random number generator, bailing out.");
abort();
}
}
/**
* This is used by libnacl which requires us to provide it with a randombytes() function.
*/
void randombytes(unsigned char* buffer,unsigned long long size) // CHECKFILES_IGNORE
{
evutil_secure_rng_get_bytes(buffer, size);
}
void Crypto_randomBase32(uint8_t* output, uint32_t length)
{
uint32_t index = 0;
for (;;) {
uint8_t bin[16];
randombytes(bin, 16);
int ret = Base32_encode(&output[index], length - index, bin, 16);
if (ret == Base32_TOO_BIG || index + ret == length) {
break;
}
index += ret;
}
}