/*############################################################################
# Copyright 2016-2017 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
############################################################################*/

/*!
* \file
* \brief SHA256 implementation.
*/
#include "epid/common/math/hash.h"
#include "epid/common/math/src/bignum-internal.h"
#include "ext/ipp/include/ippcp.h"

EpidStatus Sha256MessageDigest(void const* msg, size_t len,
                               Sha256Digest* digest) {
  IppStatus sts;
  int ipp_len = (int)len;

  if ((len && !msg) || !digest) return kEpidBadArgErr;

  if (INT_MAX < len) return kEpidBadArgErr;

  sts = ippsSHA256MessageDigest(msg, ipp_len, (IppOctStr)digest);
  if (ippStsNoErr != sts) {
    if (ippStsLengthErr == sts) {
      return kEpidBadArgErr;
    } else {
      return kEpidMathErr;
    }
  }

  return kEpidNoErr;
}