05ddb47a91
This patch adds a simple ECC library that will act as a fundamental building block for LE Secure Connections. The library has a simple API consisting of two functions: one for generating a public/private key pair and another one for generating a Diffie-Hellman key from a local private key and a remote public key. The code has been taken from https://github.com/kmackay/easy-ecc and modified to conform with the kernel coding style. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
54 lines
2.3 KiB
C
54 lines
2.3 KiB
C
/*
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* Copyright (c) 2013, Kenneth MacKay
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Create a public/private key pair.
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* Outputs:
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* public_key - Will be filled in with the public key.
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* private_key - Will be filled in with the private key.
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*
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* Returns true if the key pair was generated successfully, false
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* if an error occurred. The keys are with the LSB first.
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*/
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bool ecc_make_key(u8 public_key[64], u8 private_key[32]);
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/* Compute a shared secret given your secret key and someone else's
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* public key.
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* Note: It is recommended that you hash the result of ecdh_shared_secret
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* before using it for symmetric encryption or HMAC.
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*
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* Inputs:
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* public_key - The public key of the remote party
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* private_key - Your private key.
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*
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* Outputs:
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* secret - Will be filled in with the shared secret value.
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*
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* Returns true if the shared secret was generated successfully, false
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* if an error occurred. Both input and output parameters are with the
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* LSB first.
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*/
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bool ecdh_shared_secret(const u8 public_key[64], const u8 private_key[32],
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u8 secret[32]);
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