apache / mynewt-documentation / 94c47ae2bc67c54a68d227abbb47c27ae97cc232 / . / versions / v1_4_0 / mynewt-core / crypto / tinycrypt / include / tinycrypt / ecc_dh.h

/* ecc_dh.h - TinyCrypt interface to EC-DH implementation */ | |

/* | |

* Copyright (c) 2014, Kenneth MacKay | |

* All rights reserved. | |

* | |

* Redistribution and use in source and binary forms, with or without | |

* modification, are permitted provided that the following conditions are met: | |

* | |

* * Redistributions of source code must retain the above copyright notice, this | |

* list of conditions and the following disclaimer. | |

* | |

* * 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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. | |

*/ | |

/* Copyright (C) 2017 by Intel Corporation, All Rights Reserved. | |

* | |

* Redistribution and use in source and binary forms, with or without | |

* modification, are permitted provided that the following conditions are met: | |

* | |

* - Redistributions of source code must retain the above copyright notice, | |

* this list of conditions and the following disclaimer. | |

* | |

* - 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. | |

* | |

* - Neither the name of Intel Corporation nor the names of its contributors | |

* may be used to endorse or promote products derived from this software | |

* without specific prior written permission. | |

* | |

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. | |

*/ | |

/** | |

* @file | |

* @brief -- Interface to EC-DH implementation. | |

* | |

* Overview: This software is an implementation of EC-DH. This implementation | |

* uses curve NIST p-256. | |

* | |

* Security: The curve NIST p-256 provides approximately 128 bits of security. | |

*/ | |

#ifndef __TC_ECC_DH_H__ | |

#define __TC_ECC_DH_H__ | |

#include <tinycrypt/ecc.h> | |

#ifdef __cplusplus | |

extern "C" { | |

#endif | |

/** | |

* @brief Create a public/private key pair. | |

* @return returns TC_CRYPTO_SUCCESS (1) if the key pair was generated successfully | |

* returns TC_CRYPTO_FAIL (0) if error while generating key pair | |

* | |

* @param p_public_key OUT -- Will be filled in with the public key. Must be at | |

* least 2 * the curve size (in bytes) long. For curve secp256r1, p_public_key | |

* must be 64 bytes long. | |

* @param p_private_key OUT -- Will be filled in with the private key. Must be as | |

* long as the curve order (for secp256r1, p_private_key must be 32 bytes long). | |

* | |

* @note side-channel countermeasure: algorithm strengthened against timing | |

* attack. | |

* @warning A cryptographically-secure PRNG function must be set (using | |

* uECC_set_rng()) before calling uECC_make_key(). | |

*/ | |

int uECC_make_key(uint8_t *p_public_key, uint8_t *p_private_key, uECC_Curve curve); | |

#ifdef ENABLE_TESTS | |

/** | |

* @brief Create a public/private key pair given a specific d. | |

* | |

* @note THIS FUNCTION SHOULD BE CALLED ONLY FOR TEST PURPOSES. Refer to | |

* uECC_make_key() function for real applications. | |

*/ | |

int uECC_make_key_with_d(uint8_t *p_public_key, uint8_t *p_private_key, | |

unsigned int *d, uECC_Curve curve); | |

#endif | |

/** | |

* @brief Compute a shared secret given your secret key and someone else's | |

* public key. | |

* @return returns TC_CRYPTO_SUCCESS (1) if the shared secret was computed successfully | |

* returns TC_CRYPTO_FAIL (0) otherwise | |

* | |

* @param p_secret OUT -- Will be filled in with the shared secret value. Must be | |

* the same size as the curve size (for curve secp256r1, secret must be 32 bytes | |

* long. | |

* @param p_public_key IN -- The public key of the remote party. | |

* @param p_private_key IN -- Your private key. | |

* | |

* @warning It is recommended to use the output of uECC_shared_secret() as the | |

* input of a recommended Key Derivation Function (see NIST SP 800-108) in | |

* order to produce a cryptographically secure symmetric key. | |

*/ | |

int uECC_shared_secret(const uint8_t *p_public_key, const uint8_t *p_private_key, | |

uint8_t *p_secret, uECC_Curve curve); | |

#ifdef __cplusplus | |

} | |

#endif | |

#endif /* __TC_ECC_DH_H__ */ |