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/* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0"
*
* Written by Nir Drucker and Shay Gueron,
* AWS Cryptographic Algorithms Group.
* (ndrucker@amazon.com, gueron@amazon.com)
*/
#pragma once
#include "types.h"
#ifdef USE_OPENSSL
# include "openssl_utils.h"
#endif
#ifdef USE_OPENSSL_GF2M
// res = a*b mod (x^r - 1)
// Note: the caller must allocate twice the size of res.
_INLINE_ ret_t
gf2x_mod_mul(OUT uint64_t *res, IN const uint64_t *a, IN const uint64_t *b)
{
return cyclic_product((uint8_t *)res, (const uint8_t *)a, (const uint8_t *)b);
}
// A wrapper for other gf2x_add implementations.
_INLINE_ ret_t
gf2x_add(OUT uint8_t *res,
IN const uint8_t *a,
IN const uint8_t *b,
IN const uint64_t size)
{
BIKE_UNUSED(size);
return ossl_add((uint8_t *)res, a, b);
}
#else // USE_OPENSSL_GF2M
_INLINE_ ret_t
gf2x_add(OUT uint8_t *res,
IN const uint8_t *a,
IN const uint8_t *b,
IN const uint64_t bytelen)
{
for(uint64_t i = 0; i < bytelen; i++)
{
res[i] = a[i] ^ b[i];
}
return SUCCESS;
}
// res = a*b mod (x^r - 1)
// the caller must allocate twice the size of res!
ret_t
gf2x_mod_mul(OUT uint64_t *res, IN const uint64_t *a, IN const uint64_t *b);
#endif
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