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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.
*/
#include "tls/extensions/s2n_key_share.h"
#include "tls/s2n_tls.h"
#include "utils/s2n_safety.h"
/* Generate and write an ecc point.
* This is used to write the ecc portion of PQ hybrid keyshares, which does NOT include the curve id.
*/
S2N_RESULT s2n_ecdhe_send_public_key(struct s2n_ecc_evp_params *ecc_evp_params, struct s2n_stuffer *out, bool len_prefixed)
{
RESULT_ENSURE_REF(ecc_evp_params);
RESULT_ENSURE_REF(ecc_evp_params->negotiated_curve);
if (len_prefixed) {
RESULT_GUARD_POSIX(s2n_stuffer_write_uint16(out, ecc_evp_params->negotiated_curve->share_size));
}
if (ecc_evp_params->evp_pkey == NULL) {
RESULT_GUARD_POSIX(s2n_ecc_evp_generate_ephemeral_key(ecc_evp_params));
}
RESULT_GUARD_POSIX(s2n_ecc_evp_write_params_point(ecc_evp_params, out));
return S2N_RESULT_OK;
}
/* Generate and write an ecc point and its corresponding curve id.
* This is used to write ecc keyshares for the client and server key_share extensions.
*/
int s2n_ecdhe_parameters_send(struct s2n_ecc_evp_params *ecc_evp_params, struct s2n_stuffer *out)
{
POSIX_ENSURE_REF(ecc_evp_params);
POSIX_ENSURE_REF(ecc_evp_params->negotiated_curve);
POSIX_GUARD(s2n_stuffer_write_uint16(out, ecc_evp_params->negotiated_curve->iana_id));
POSIX_GUARD_RESULT(s2n_ecdhe_send_public_key(ecc_evp_params, out, true));
return S2N_SUCCESS;
}
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