mirror of
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62 lines
2.2 KiB
C
62 lines
2.2 KiB
C
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/* libanode: the Anode C reference implementation
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* Copyright (C) 2009-2010 Adam Ierymenko <adam.ierymenko@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Elliptic curve glue -- hides OpenSSL code behind this source module */
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#ifndef _ANODE_EC_H
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#define _ANODE_EC_H
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#include "misc.h"
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/* Right now, only one mode is supported: NIST-P-256. This is the only mode
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* supported in the spec as well, and should be good for quite some time.
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* If other modes are needed this code will need to be refactored. */
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/* NIST-P-256 prime size in bytes */
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#define ANODE_EC_PRIME_BYTES 32
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/* Sizes of key fields */
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#define ANODE_EC_GROUP NID_X9_62_prime256v1
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#define ANODE_EC_PUBLIC_KEY_BYTES (ANODE_EC_PRIME_BYTES + 1)
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#define ANODE_EC_PRIVATE_KEY_BYTES ANODE_EC_PRIME_BYTES
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/* Larger of public or private key bytes, used for buffers */
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#define ANODE_EC_MAX_BYTES ANODE_EC_PUBLIC_KEY_BYTES
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struct AnodeECKey
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{
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unsigned char key[ANODE_EC_MAX_BYTES];
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unsigned int bytes;
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};
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struct AnodeECKeyPair
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{
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struct AnodeECKey pub;
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struct AnodeECKey priv;
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void *internal_key;
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};
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/* Key management functions */
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int AnodeECKeyPair_generate(struct AnodeECKeyPair *pair);
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int AnodeECKeyPair_init(struct AnodeECKeyPair *pair,const struct AnodeECKey *pub,const struct AnodeECKey *priv);
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void AnodeECKeyPair_destroy(struct AnodeECKeyPair *pair);
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int AnodeECKeyPair_agree(const struct AnodeECKeyPair *my_key_pair,const struct AnodeECKey *their_pub_key,unsigned char *key_buf,unsigned int key_len);
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/* Provides access to the secure PRNG used to generate keys */
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void AnodeEC_random(unsigned char *buf,unsigned int len);
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#endif
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