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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
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