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83 lines
3.4 KiB
83 lines
3.4 KiB
/* |
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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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#ifndef _CRYPTO_ECC_H |
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#define _CRYPTO_ECC_H |
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#define ECC_MAX_DIGITS 4 /* 256 */ |
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#define ECC_DIGITS_TO_BYTES_SHIFT 3 |
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/** |
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* ecc_is_key_valid() - Validate a given ECDH private key |
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* |
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* @curve_id: id representing the curve to use |
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* @ndigits: curve number of digits |
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* @private_key: private key to be used for the given curve |
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* @private_key_len: private key len |
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* |
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* Returns 0 if the key is acceptable, a negative value otherwise |
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*/ |
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int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits, |
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const u8 *private_key, unsigned int private_key_len); |
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/** |
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* ecdh_make_pub_key() - Compute an ECC public key |
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* |
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* @curve_id: id representing the curve to use |
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* @private_key: pregenerated private key for the given curve |
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* @private_key_len: length of private_key |
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* @public_key: buffer for storing the public key generated |
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* @public_key_len: length of the public_key buffer |
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* |
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* Returns 0 if the public key was generated successfully, a negative value |
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* if an error occurred. |
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*/ |
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int ecdh_make_pub_key(const unsigned int curve_id, unsigned int ndigits, |
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const u8 *private_key, unsigned int private_key_len, |
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u8 *public_key, unsigned int public_key_len); |
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/** |
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* crypto_ecdh_shared_secret() - Compute a shared secret |
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* |
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* @curve_id: id representing the curve to use |
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* @private_key: private key of part A |
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* @private_key_len: length of private_key |
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* @public_key: public key of counterpart B |
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* @public_key_len: length of public_key |
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* @secret: buffer for storing the calculated shared secret |
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* @secret_len: length of the secret buffer |
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* |
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* Note: It is recommended that you hash the result of crypto_ecdh_shared_secret |
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* before using it for symmetric encryption or HMAC. |
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* |
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* Returns 0 if the shared secret was generated successfully, a negative value |
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* if an error occurred. |
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*/ |
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int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, |
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const u8 *private_key, unsigned int private_key_len, |
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const u8 *public_key, unsigned int public_key_len, |
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u8 *secret, unsigned int secret_len); |
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#endif
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