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soter_ec_key.h
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soter_ec_key.h
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/*
* Copyright (c) 2015 Cossack Labs Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SOTER_EC_KEY_H
#define SOTER_EC_KEY_H
#include <soter/soter_container.h>
#include <soter/soter_error.h>
/** private key header part */
#define EC_PRIV_KEY_PREF "REC"
/** public key header part */
#define EC_PUB_KEY_PREF "UEC"
/** elliptic curve header part for 256bits key*/
#define EC_256 "2"
/** @brief elliptic curve header part for 384bits key*/
#define EC_384 "3"
/** @brief elliptic curve header part for 521bits key*/
#define EC_521 "5"
#define EC_SIZE_TAG_256 '2'
#define EC_SIZE_TAG_384 '3'
#define EC_SIZE_TAG_521 '5'
#define EC_KEY_SUF(_KEY_SIZE_) EC_##_KEY_SIZE_
#define EC_PRIV_KEY_TAG(_KEY_SIZE_) (EC_PRIV_KEY_PREF EC_KEY_SUF(_KEY_SIZE_))
#define EC_PUB_KEY_TAG(_KEY_SIZE_) (EC_PUB_KEY_PREF EC_KEY_SUF(_KEY_SIZE_))
#define EC_BYTE_SIZE(_KEY_SIZE_) (((_KEY_SIZE_) + 7) / 8)
#define EC_PRIV_SIZE(_KEY_SIZE_) EC_BYTE_SIZE(_KEY_SIZE_)
#define EC_PUB_SIZE(_KEY_SIZE_) (EC_BYTE_SIZE(_KEY_SIZE_) + 1)
#define EC_PUB_UNCOMPRESSED_SIZE(_KEY_SIZE_) (2 * EC_BYTE_SIZE(_KEY_SIZE_) + 1)
#define DECLARE_EC_PUBLIC_KEY(_KEY_SIZE_) \
struct soter_ec_pub_key_##_KEY_SIZE_##_type { \
soter_container_hdr_t hdr; \
uint8_t d[EC_PUB_SIZE(_KEY_SIZE_)]; \
}; \
\
typedef struct soter_ec_pub_key_##_KEY_SIZE_##_type soter_ec_pub_key_##_KEY_SIZE_##_t
/* struct members are ordered this way to avoid struct member alignment on different platforms */
#define DECLARE_EC_PRIVATE_KEY(_KEY_SIZE_) \
struct soter_ec_priv_key_##_KEY_SIZE_##_type { \
soter_container_hdr_t hdr; \
uint8_t Q[EC_PRIV_SIZE(_KEY_SIZE_)]; \
}; \
\
typedef struct soter_ec_priv_key_##_KEY_SIZE_##_type soter_ec_priv_key_##_KEY_SIZE_##_t
#define DECLARE_EC_KEY(_KEY_SIZE_) \
DECLARE_EC_PUBLIC_KEY(_KEY_SIZE_); \
DECLARE_EC_PRIVATE_KEY(_KEY_SIZE_)
DECLARE_EC_KEY(256);
DECLARE_EC_KEY(384);
DECLARE_EC_KEY(521);
/* This is considered internal API */
typedef void soter_engine_specific_ec_key_t;
soter_status_t soter_ec_pub_key_to_engine_specific(const soter_container_hdr_t* key,
size_t key_length,
soter_engine_specific_ec_key_t** engine_key);
soter_status_t soter_ec_priv_key_to_engine_specific(const soter_container_hdr_t* key,
size_t key_length,
soter_engine_specific_ec_key_t** engine_key);
soter_status_t soter_engine_specific_to_ec_priv_key(const soter_engine_specific_ec_key_t* engine_key,
soter_container_hdr_t* key,
size_t* key_length);
soter_status_t soter_engine_specific_to_ec_pub_key(const soter_engine_specific_ec_key_t* engine_key,
bool compressed,
soter_container_hdr_t* key,
size_t* key_length);
soter_status_t soter_ec_pub_key_check_length(const soter_container_hdr_t* key, size_t key_length);
soter_status_t soter_ec_priv_key_check_length(const soter_container_hdr_t* key, size_t key_length);
#endif /* SOTER_EC_KEY_H */