/*************************************************************************
* Copyright (C) 2023 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.
*************************************************************************/

#ifdef IPPCP_FIPS_MODE
#include "ippcp.h"
#include "owndefs.h"
#include "dispatcher.h"

// FIPS selftests are not processed by dispatcher.
// Prevent several copies of the same functions.
#ifdef _IPP_DATA

#include "ippcp/fips_cert.h"
#include "fips_cert_internal/common.h"

#define IV_BYTE_LEN  (12) // initialization vector
#define AD_BYTE_LEN  (20) // additional authenticated data
#define MSG_BYTE_LEN (60)
#define TAG_BYTE_LEN (16)

/* KAT TEST */
/* secret key */
static const Ipp8u key[IPPCP_AES_KEY128_BYTE_LEN] = {0xfe,0xff,0xe9,0x92,0x86,0x65,0x73,0x1c,
                                                     0x6d,0x6a,0x8f,0x94,0x67,0x30,0x83,0x08};
/* initialization vector */
static const Ipp8u iv[IV_BYTE_LEN]      = {0xca,0xfe,0xba,0xbe,0xfa,0xce,0xdb,0xad,
                                           0xde,0xca,0xf8,0x88};
/* plaintext */
static const Ipp8u ptext[MSG_BYTE_LEN]  = {
  0xd9,0x31,0x32,0x25,0xf8,0x84,0x06,0xe5,0xa5,0x59,0x09,0xc5,0xaf,0xf5,0x26,0x9a,
  0x86,0xa7,0xa9,0x53,0x15,0x34,0xf7,0xda,0x2e,0x4c,0x30,0x3d,0x8a,0x31,0x8a,0x72,
  0x1c,0x3c,0x0c,0x95,0x95,0x68,0x09,0x53,0x2f,0xcf,0x0e,0x24,0x49,0xa6,0xb5,0x25,
  0xb1,0x6a,0xed,0xf5,0xaa,0x0d,0xe6,0x57,0xba,0x63,0x7b,0x39};
/* ciphertext */
static const Ipp8u ctext[MSG_BYTE_LEN]  = {
  0x42,0x83,0x1e,0xc2,0x21,0x77,0x74,0x24,0x4b,0x72,0x21,0xb7,0x84,0xd0,0xd4,0x9c,
  0xe3,0xaa,0x21,0x2f,0x2c,0x02,0xa4,0xe0,0x35,0xc1,0x7e,0x23,0x29,0xac,0xa1,0x2e,
  0x21,0xd5,0x14,0xb2,0x54,0x66,0x93,0x1c,0x7d,0x8f,0x6a,0x5a,0xac,0x84,0xaa,0x05,
  0x1b,0xa3,0x0b,0x39,0x6a,0x0a,0xac,0x97,0x3d,0x58,0xe0,0x91};
/* tag */
static const Ipp8u tag[TAG_BYTE_LEN]    = {0x5b,0xc9,0x4f,0xbc,0x32,0x21,0xa5,0xdb,
                                           0x94,0xfa,0xe9,0x5a,0xe7,0x12,0x1a,0x47};
/* additional authenticated data */
static const Ipp8u ad[AD_BYTE_LEN]      = {0xfe,0xed,0xfa,0xce,0xde,0xad,0xbe,0xef,
                                           0xfe,0xed,0xfa,0xce,0xde,0xad,0xbe,0xef,
                                           0xab,0xad,0xda,0xd2};

IPPFUN(fips_test_status, fips_selftest_ippsAES_GCM_get_size, (int *pBufferSize)) {
    /* return bad status if input pointer is NULL */
    IPP_BADARG_RET((NULL == pBufferSize), IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR);

    IppStatus sts = ippStsNoErr;
    int ctx_size = 0;
    sts = ippsAES_GCMGetSize(&ctx_size);
    if (sts != ippStsNoErr) { return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR; }

    ctx_size += IPPCP_AES_ALIGNMENT;
    *pBufferSize = ctx_size;

    return IPPCP_ALGO_SELFTEST_OK;
}

IPPFUN(fips_test_status, fips_selftest_ippsAES_GCMEncrypt, (Ipp8u *pBuffer))
{
  IppStatus sts = ippStsNoErr;

  /* check input pointers and allocate memory in "use malloc" mode */
  int internalMemMgm = 0;
  int ctx_size = 0;
  sts = fips_selftest_ippsAES_GCM_get_size(&ctx_size);
  if (sts != ippStsNoErr) { return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR; }
  BUF_CHECK_NULL_AND_ALLOC(pBuffer, internalMemMgm, ctx_size, IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR)

  /* output ciphertext */
  Ipp8u out_ctext[MSG_BYTE_LEN];
  /* output tag */
  Ipp8u out_tag[TAG_BYTE_LEN];
  /* context */
  IppsAES_GCMState *state = (IppsAES_GCMState *)IPP_ALIGNED_PTR(pBuffer, IPPCP_AES_ALIGNMENT);

  /* context initialization */
  ippsAES_GCMGetSize(&ctx_size);
  sts = ippsAES_GCMInit(key, IPPCP_AES_KEY128_BYTE_LEN, state, ctx_size);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }

  /* encryption setup */
  sts = ippsAES_GCMStart(iv, IV_BYTE_LEN, ad, AD_BYTE_LEN, state);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }
  /* encryption */
  for (int i = 0; i < MSG_BYTE_LEN; ++i){
    sts = ippsAES_GCMEncrypt(ptext + i, out_ctext + i, 1, state);
    if (sts != ippStsNoErr) {
      MEMORY_FREE(pBuffer, internalMemMgm)
      return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
    }
  }
  /* get tag */
  sts = ippsAES_GCMGetTag(out_tag, TAG_BYTE_LEN, state);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }
  /* compare output to known answer*/
  if (!ippcp_is_mem_eq(out_tag, TAG_BYTE_LEN, tag, TAG_BYTE_LEN)) {     // tag
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_KAT_ERR;
  }
  if (!ippcp_is_mem_eq(out_ctext, MSG_BYTE_LEN, ctext, MSG_BYTE_LEN)) { // ctext
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_KAT_ERR;
  }

  MEMORY_FREE(pBuffer, internalMemMgm)
  return IPPCP_ALGO_SELFTEST_OK;
}

IPPFUN(fips_test_status, fips_selftest_ippsAES_GCMDecrypt, (Ipp8u *pBuffer))
{
  IppStatus sts = ippStsNoErr;

  /* check input pointers and allocate memory in "use malloc" mode */
  int internalMemMgm = 0;
  int ctx_size = 0;
  sts = fips_selftest_ippsAES_GCM_get_size(&ctx_size);
  if (sts != ippStsNoErr) { return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR; }
  BUF_CHECK_NULL_AND_ALLOC(pBuffer, internalMemMgm, ctx_size, IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR)

  /* output plaintext */
  Ipp8u out_ptext[MSG_BYTE_LEN];
  /* output tag */
  Ipp8u out_tag[TAG_BYTE_LEN];
  /* context */
  IppsAES_GCMState *state = (IppsAES_GCMState *)IPP_ALIGNED_PTR(pBuffer, IPPCP_AES_ALIGNMENT);

  /* context initialization */
  sts = ippsAES_GCMGetSize(&ctx_size);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }
  sts = ippsAES_GCMInit(key, IPPCP_AES_KEY128_BYTE_LEN, state, ctx_size);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }

  /* decryption setup */
  sts = ippsAES_GCMStart(iv,IV_BYTE_LEN, ad, AD_BYTE_LEN, state);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }
  /* decryption */
  for (int i = 0; i < MSG_BYTE_LEN; ++i){
    sts = ippsAES_GCMDecrypt(ctext + i, out_ptext + i, 1, state);
    if (sts != ippStsNoErr) {
      MEMORY_FREE(pBuffer, internalMemMgm)
      return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
    }
  }
  /* get tag */
  sts = ippsAES_GCMGetTag(out_tag, TAG_BYTE_LEN, state);
  if (sts != ippStsNoErr) {
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_BAD_ARGS_ERR;
  }

  /* compare output to known answer */
  if (!ippcp_is_mem_eq(out_tag, TAG_BYTE_LEN, tag, TAG_BYTE_LEN)){ // tag
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_KAT_ERR;
  }
  if (!ippcp_is_mem_eq(out_ptext, MSG_BYTE_LEN, ptext, MSG_BYTE_LEN)){ // ptext
    MEMORY_FREE(pBuffer, internalMemMgm)
    return IPPCP_ALGO_SELFTEST_KAT_ERR;
  }

  MEMORY_FREE(pBuffer, internalMemMgm)
  return IPPCP_ALGO_SELFTEST_OK;
}

#endif // _IPP_DATA
#endif // IPPCP_FIPS_MODE
