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       1                 :            : /*
       2                 :            :  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License").
       5                 :            :  * You may not use this file except in compliance with the License.
       6                 :            :  * A copy of the License is located at
       7                 :            :  *
       8                 :            :  *  http://aws.amazon.com/apache2.0
       9                 :            :  *
      10                 :            :  * or in the "license" file accompanying this file. This file is distributed
      11                 :            :  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
      12                 :            :  * express or implied. See the License for the specific language governing
      13                 :            :  * permissions and limitations under the License.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "crypto/s2n_cipher.h"
      17                 :            : #include "error/s2n_errno.h"
      18                 :            : #include "utils/s2n_blob.h"
      19                 :            : #include "utils/s2n_safety.h"
      20                 :            : 
      21                 :            : static bool s2n_stream_cipher_null_available(void)
      22                 :          0 : {
      23                 :          0 :     return true;
      24                 :          0 : }
      25                 :            : 
      26                 :            : static int s2n_stream_cipher_null_endecrypt(struct s2n_session_key *key, struct s2n_blob *in, struct s2n_blob *out)
      27                 :     127390 : {
      28 [ -  + ][ #  # ]:     127390 :     S2N_ERROR_IF(out->size < in->size, S2N_ERR_SIZE_MISMATCH);
      29                 :            : 
      30         [ -  + ]:     127390 :     if (in->data != out->data) {
      31 [ #  # ][ #  # ]:          0 :         POSIX_CHECKED_MEMCPY(out->data, in->data, out->size);
                 [ #  # ]
      32                 :          0 :     }
      33                 :     127390 :     return 0;
      34                 :     127390 : }
      35                 :            : 
      36                 :            : static S2N_RESULT s2n_stream_cipher_null_get_key(struct s2n_session_key *key, struct s2n_blob *in)
      37                 :          0 : {
      38                 :          0 :     return S2N_RESULT_OK;
      39                 :          0 : }
      40                 :            : 
      41                 :            : static S2N_RESULT s2n_stream_cipher_null_destroy_key(struct s2n_session_key *key)
      42                 :       4386 : {
      43                 :       4386 :     return S2N_RESULT_OK;
      44                 :       4386 : }
      45                 :            : 
      46                 :            : static S2N_RESULT s2n_stream_cipher_null_init(struct s2n_session_key *key)
      47                 :          0 : {
      48                 :          0 :     return S2N_RESULT_OK;
      49                 :          0 : }
      50                 :            : 
      51                 :            : const struct s2n_cipher s2n_null_cipher = {
      52                 :            :     .type = S2N_STREAM,
      53                 :            :     .key_material_size = 0,
      54                 :            :     .io.stream = {
      55                 :            :             .decrypt = s2n_stream_cipher_null_endecrypt,
      56                 :            :             .encrypt = s2n_stream_cipher_null_endecrypt },
      57                 :            :     .is_available = s2n_stream_cipher_null_available,
      58                 :            :     .init = s2n_stream_cipher_null_init,
      59                 :            :     .set_encryption_key = s2n_stream_cipher_null_get_key,
      60                 :            :     .set_decryption_key = s2n_stream_cipher_null_get_key,
      61                 :            :     .destroy_key = s2n_stream_cipher_null_destroy_key,
      62                 :            : };