net/bluetooth/ecc.h

   1 /*
   2  * Copyright (c) 2013, Kenneth MacKay
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *  * Redistributions of source code must retain the above copyright
   9  *   notice, this list of conditions and the following disclaimer.
  10  *  * Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  15  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  16  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  17  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  18  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  19  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  20  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 /* Create a public/private key pair.
  28  * Outputs:
  29  *      public_key  - Will be filled in with the public key.
  30  *      private_key - Will be filled in with the private key.
  31  *
  32  * Returns true if the key pair was generated successfully, false
  33  * if an error occurred. The keys are with the LSB first.
  34  */
  35 bool ecc_make_key(u8 public_key[64], u8 private_key[32]);
  36
  37 /* Compute a shared secret given your secret key and someone else's
  38  * public key.
  39  * Note: It is recommended that you hash the result of ecdh_shared_secret
  40  * before using it for symmetric encryption or HMAC.
  41  *
  42  * Inputs:
  43  *      public_key  - The public key of the remote party
  44  *      private_key - Your private key.
  45  *
  46  * Outputs:
  47  *      secret - Will be filled in with the shared secret value.
  48  *
  49  * Returns true if the shared secret was generated successfully, false
  50  * if an error occurred. Both input and output parameters are with the
  51  * LSB first.
  52  */
  53 bool ecdh_shared_secret(const u8 public_key[64], const u8 private_key[32],
  54                         u8 secret[32]);