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crypto/ecc.h
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/* * Copyright (c) 2013, 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. */ #ifndef _CRYPTO_ECC_H #define _CRYPTO_ECC_H #define ECC_CURVE_NIST_P192_DIGITS 3 #define ECC_CURVE_NIST_P256_DIGITS 4 #define ECC_MAX_DIGITS ECC_CURVE_NIST_P256_DIGITS #define ECC_DIGITS_TO_BYTES_SHIFT 3 /** * ecc_is_key_valid() - Validate a given ECDH private key * * @curve_id: id representing the curve to use * @ndigits: curve's number of digits * @private_key: private key to be used for the given curve * @private_key_len: private key length * * Returns 0 if the key is acceptable, a negative value otherwise */ int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits, const u64 *private_key, unsigned int private_key_len); /** * ecc_gen_privkey() - Generates an ECC private key. * The private key is a random integer in the range 0 < random < n, where n is a * prime that is the order of the cyclic subgroup generated by the distinguished * point G. * @curve_id: id representing the curve to use * @ndigits: curve number of digits * @private_key: buffer for storing the generated private key * * Returns 0 if the private key was generated successfully, a negative value * if an error occurred. */ int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey); /** * ecc_make_pub_key() - Compute an ECC public key * * @curve_id: id representing the curve to use * @ndigits: curve's number of digits * @private_key: pregenerated private key for the given curve * @public_key: buffer for storing the generated public key * * Returns 0 if the public key was generated successfully, a negative value * if an error occurred. */ int ecc_make_pub_key(const unsigned int curve_id, unsigned int ndigits, const u64 *private_key, u64 *public_key); /** * crypto_ecdh_shared_secret() - Compute a shared secret * * @curve_id: id representing the curve to use * @ndigits: curve's number of digits * @private_key: private key of part A * @public_key: public key of counterpart B * @secret: buffer for storing the calculated shared secret * * Note: It is recommended that you hash the result of crypto_ecdh_shared_secret * before using it for symmetric encryption or HMAC. * * Returns 0 if the shared secret was generated successfully, a negative value * if an error occurred. */ int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, const u64 *private_key, const u64 *public_key, u64 *secret); #endif |