FreeBSD/Linux Kernel Cross Reference
sys/crypto/curve25519.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2021 The FreeBSD Foundation
      *
      * This software was developed by Ararat River Consulting, LLC under
      * sponsorship from the FreeBSD Foundation.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #ifndef __CRYPTO_CURVE25519_H__
    #define __CRYPTO_CURVE25519_H__
    
    #include <sys/libkern.h>
    
    #define CURVE25519_KEY_SIZE     32
    
    bool    curve25519(uint8_t *public, const uint8_t *secret,
        const uint8_t *basepoint);
    bool    curve25519_generate_public(uint8_t *public,
        const uint8_t *secret);
    
    static __inline void
    curve25519_clamp_secret(uint8_t *secret)
    {
            secret[0] &= 248;
            secret[31] &= 127;
            secret[31] |= 64;
    }
    
    static __inline void
    curve25519_generate_secret(uint8_t *secret)
    {
            arc4random_buf(secret, CURVE25519_KEY_SIZE);
            curve25519_clamp_secret(secret);
    }
    
    #endif /* __CRYPTO_CURVE25519_H__ */

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