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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 "tls/extensions/s2n_key_share.h"
      17                 :            : 
      18                 :            : #include "tls/s2n_tls.h"
      19                 :            : #include "utils/s2n_safety.h"
      20                 :            : 
      21                 :            : /* Generate and write an ecc point.
      22                 :            :  * This is used to write the ecc portion of PQ hybrid keyshares, which does NOT include the curve id.
      23                 :            :  */
      24                 :            : S2N_RESULT s2n_ecdhe_send_public_key(struct s2n_ecc_evp_params *ecc_evp_params, struct s2n_stuffer *out, bool len_prefixed)
      25                 :       9603 : {
      26 [ -  + ][ #  # ]:       9603 :     RESULT_ENSURE_REF(ecc_evp_params);
      27 [ -  + ][ #  # ]:       9603 :     RESULT_ENSURE_REF(ecc_evp_params->negotiated_curve);
      28                 :            : 
      29         [ +  - ]:       9603 :     if (len_prefixed) {
      30         [ -  + ]:       9603 :         RESULT_GUARD_POSIX(s2n_stuffer_write_uint16(out, ecc_evp_params->negotiated_curve->share_size));
      31                 :       9603 :     }
      32                 :            : 
      33         [ +  + ]:       9603 :     if (ecc_evp_params->evp_pkey == NULL) {
      34         [ +  + ]:       9602 :         RESULT_GUARD_POSIX(s2n_ecc_evp_generate_ephemeral_key(ecc_evp_params));
      35                 :       9602 :     }
      36         [ +  + ]:       9602 :     RESULT_GUARD_POSIX(s2n_ecc_evp_write_params_point(ecc_evp_params, out));
      37                 :            : 
      38                 :       9601 :     return S2N_RESULT_OK;
      39                 :       9602 : }
      40                 :            : 
      41                 :            : /* Generate and write an ecc point and its corresponding curve id.
      42                 :            :  * This is used to write ecc keyshares for the client and server key_share extensions.
      43                 :            :  */
      44                 :            : int s2n_ecdhe_parameters_send(struct s2n_ecc_evp_params *ecc_evp_params, struct s2n_stuffer *out)
      45                 :       9603 : {
      46 [ -  + ][ #  # ]:       9603 :     POSIX_ENSURE_REF(ecc_evp_params);
      47 [ #  # ][ -  + ]:       9603 :     POSIX_ENSURE_REF(ecc_evp_params->negotiated_curve);
      48                 :            : 
      49         [ -  + ]:       9603 :     POSIX_GUARD(s2n_stuffer_write_uint16(out, ecc_evp_params->negotiated_curve->iana_id));
      50         [ +  + ]:       9603 :     POSIX_GUARD_RESULT(s2n_ecdhe_send_public_key(ecc_evp_params, out, true));
      51                 :            : 
      52                 :       9601 :     return S2N_SUCCESS;
      53                 :       9603 : }