libwebsockets/lib/tls/mbedtls/lws-gencrypto.c

/*
 * libwebsockets - generic crypto api hiding the backend
 *
 * Copyright (C) 2017 - 2018 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 *
 *  lws-gencrypto openssl-specific common code
 */

#include "core/private.h"
#include "tls/mbedtls/private.h"

mbedtls_md_type_t
lws_gencrypto_mbedtls_hash_to_MD_TYPE(enum lws_genhash_types hash_type)
{
	mbedtls_md_type_t h = -1;

	switch (hash_type) {
	case LWS_GENHASH_TYPE_MD5:
		h = MBEDTLS_MD_MD5;
		break;
	case LWS_GENHASH_TYPE_SHA1:
		h = MBEDTLS_MD_SHA1;
		break;
	case LWS_GENHASH_TYPE_SHA256:
		h = MBEDTLS_MD_SHA256;
		break;
	case LWS_GENHASH_TYPE_SHA384:
		h = MBEDTLS_MD_SHA384;
		break;
	case LWS_GENHASH_TYPE_SHA512:
		h = MBEDTLS_MD_SHA512;
		break;
	default:
		break;
	}

	return h;
}

int
lws_gencrypto_mbedtls_rngf(void *context, unsigned char *buf, size_t len)
{
	if ((size_t)lws_get_random(context, buf, len) == len) {
		// lwsl_hexdump_err(buf, len);
		return 0;
	}
	lwsl_err("%s: rng failed\n", __func__);
	return -1;
}