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/**
* Copyright (C) 2021 Mikael Magnusson <mikma@user.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2 as published by
* the Free Software Foundation.
*
* 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.
*
*/
#include "prng.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <libubox/md5.h>
/* PRNG using MD5 from libubox. */
struct prng_context_s
{
md5_ctx_t md5;
};
prng_context_t *prng_alloc()
{
prng_context_t *ctx = calloc(1, sizeof(prng_context_t));
return ctx;
}
void prng_setup(prng_context_t *ctx)
{
memset(ctx, 0, sizeof(*ctx));
}
void prng_starts(prng_context_t *ctx)
{
md5_begin(&ctx->md5);
}
void prng_update(prng_context_t *ctx, const uint8_t *input, size_t ilen)
{
md5_hash(input, ilen, &ctx->md5);
}
void prng_finish(prng_context_t *ctx, uint8_t *output, uint8_t *output2)
{
uint8_t tmp[16];
md5_end(tmp, &ctx->md5);
memcpy(output, tmp, 8);
if (output2)
memcpy(output2, tmp + 8, 8);
}
#if 0
void prng_free()
{
}
#endif
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