/*
 * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 * The license is detailed in the file LICENSE.md, and applies to this file.
 *
 * The original Rainbow code from
 * https://csrc.nist.gov/CSRC/media/Projects/Post-Quantum-Cryptography/documents/round-2/submissions/Rainbow-Round2.zip
 *
 * is adapted by Nir Drucker and Shay Gueron
 * AWS Cryptographic Algorithms Group.
 * (ndrucker@amazon.com, gueron@amazon.com)
 */

#pragma once

#include <stdint.h>
#include <string.h>

#ifdef __cplusplus
#    define EXTERNC       extern "C"
#    define EXTERNC_BEGIN extern "C" {
#    define EXTERNC_END   }
#else
#    define EXTERNC
#    define EXTERNC_BEGIN
#    define EXTERNC_END
#endif

// For code clarity.
#define IN
#define OUT

#define ALIGN(n) __attribute__((aligned(n)))
#define _INLINE_ static inline

#define SUCCESS 0
#define ERROR   (-1)
#define GUARD(func)             \
    {                           \
        if(SUCCESS != (func)) { \
            return ERROR;       \
        }                       \
    }

#if defined(__GNUC__) && __GNUC__ >= 2
static inline uint32_t CRYPTO_bswap4(uint32_t x) { return __builtin_bswap32(x); }
#endif

_INLINE_ void secure_clean(OUT uint8_t *p, IN const uint32_t len)
{
#ifdef _WIN32
    SecureZeroMemory(p, len);
#else
    typedef void *(*memset_t)(void *, int, size_t);
    static volatile memset_t memset_func = memset;
    memset_func(p, 0, len);
#endif
}