lcx_ecdh.h

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/*******************************************************************************
 *   Ledger Nano S - Secure firmware
 *   (c) 2022 Ledger
 *
 *  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.
 ********************************************************************************/
 
#ifndef LCX_ECDH_H
#define LCX_ECDH_H
 
#ifdef HAVE_ECDH
 
#if defined(HAVE_ECDH) || defined(HAVE_X25519) || defined(HAVE_X448)
 
#include "lcx_wrappers.h"
#include "lcx_ecfp.h"
#include <stddef.h>
 
#if defined(HAVE_ECDH)
WARN_UNUSED_RESULT cx_err_t cx_ecdh_no_throw(const cx_ecfp_private_key_t *pvkey,
                                             uint32_t                     mode,
                                             const uint8_t               *P,
                                             size_t                       P_len,
                                             uint8_t                     *secret,
                                             size_t                       secret_len);
 
DEPRECATED static inline size_t cx_ecdh(const cx_ecfp_private_key_t *pvkey,
                                        uint32_t                     mode,
                                        const unsigned char         *P,
                                        unsigned int                 P_len,
                                        unsigned char               *secret,
                                        unsigned int                 secret_len)
{
    CX_THROW(cx_ecdh_no_throw(pvkey, mode, P, P_len, secret, secret_len));
 
    size_t size;
 
    CX_THROW(cx_ecdomain_parameters_length(pvkey->curve, &size));
    if ((mode & CX_MASK_EC) == CX_ECDH_POINT) {
        return 1 + 2 * size;
    }
    else {
        return size;
    }
}
 
#endif  // HAVE_ECDH
 
#if defined(HAVE_X25519)
WARN_UNUSED_RESULT cx_err_t cx_x25519(uint8_t *u, const uint8_t *k, size_t k_len);
#endif  // HAVE_X25519
 
#if defined(HAVE_X448)
WARN_UNUSED_RESULT cx_err_t cx_x448(uint8_t *u, const uint8_t *k, size_t k_len);
#endif  // HAVE_X448
 
#endif  // HAVE_ECDH || HAVE_X25519 || HAVE_X448
 
#endif  // HAVE_ECDH
 
#endif  // LCX_ECDH_H