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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 <stdint.h>
#include <string.h>
#include <mbedtls/md.h>
/* PRNG using SHA1 from mbedtls. */
struct prng_context_s
{
mbedtls_md_context_t md;
};
prng_context_t *prng_alloc()
{
prng_context_t *ctx = calloc(1, sizeof(prng_context_t));
mbedtls_md_init(&ctx->md);
return ctx;
}
void prng_setup(prng_context_t *ctx)
{
mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
mbedtls_md_setup(&ctx->md, mbedtls_md_info_from_type(md_type), 0);
}
void prng_starts(prng_context_t *ctx)
{
mbedtls_md_starts(&ctx->md);
}
void prng_update(prng_context_t *ctx, const uint8_t *input, size_t ilen)
{
mbedtls_md_update(&ctx->md, (const unsigned char *) input, ilen);
}
void prng_finish(prng_context_t *ctx, uint8_t *output, uint8_t *output2)
{
uint8_t tmp[160];
mbedtls_md_finish(&ctx->md, tmp);
memcpy(output, tmp, 8);
if (output2)
memcpy(output2, tmp + 8, 8);
}
#if 0
void prng_free()
{
mbedtls_md_free(ctx);
}
#endif
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