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 */ 35bool 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 */ 53bool ecdh_shared_secret(const u8 public_key[64], const u8 private_key[32], 54 u8 secret[32]); 55