85 lines
2.6 KiB
C
85 lines
2.6 KiB
C
|
/*
|
||
|
|
* ECDH params to be used with kpp API
|
||
|
|
*
|
||
|
|
* Copyright (c) 2016, Intel Corporation
|
||
|
|
* Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
|
||
|
|
* Copyright (c) 2017, NVIDIA Corporation. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License as published by the Free
|
||
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
||
|
|
* any later version.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#ifndef _CRYPTO_ECDH_
|
||
|
|
#define _CRYPTO_ECDH_
|
||
|
|
|
||
|
|
#include <crypto/ecc.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* DOC: ECDH Helper Functions
|
||
|
|
*
|
||
|
|
* To use ECDH with the KPP cipher API, the following data structure and
|
||
|
|
* functions should be used.
|
||
|
|
*
|
||
|
|
* To use ECDH with KPP, the following functions should be used to operate on
|
||
|
|
* an ECDH private key. The packet private key that can be set with
|
||
|
|
* the KPP API function call of crypto_kpp_set_secret.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct ecdh - define an ECDH private key
|
||
|
|
*
|
||
|
|
* @curve_id: ECC curve the key is based on.
|
||
|
|
* @key: Private ECDH key
|
||
|
|
* @key_size: Size of the private ECDH key
|
||
|
|
*/
|
||
|
|
struct ecdh {
|
||
|
|
unsigned short curve_id;
|
||
|
|
char *key;
|
||
|
|
unsigned short key_size;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* crypto_ecdh_key_len() - Obtain the size of the private ECDH key
|
||
|
|
* @params: private ECDH key
|
||
|
|
*
|
||
|
|
* This function returns the packet ECDH key size. A caller can use that
|
||
|
|
* with the provided ECDH private key reference to obtain the required
|
||
|
|
* memory size to hold a packet key.
|
||
|
|
*
|
||
|
|
* Return: size of the key in bytes
|
||
|
|
*/
|
||
|
|
int crypto_ecdh_key_len(const struct ecdh *params);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* crypto_ecdh_encode_key() - encode the private key
|
||
|
|
* @buf: Buffer allocated by the caller to hold the packet ECDH
|
||
|
|
* private key. The buffer should be at least crypto_ecdh_key_len
|
||
|
|
* bytes in size.
|
||
|
|
* @len: Length of the packet private key buffer
|
||
|
|
* @p: Buffer with the caller-specified private key
|
||
|
|
*
|
||
|
|
* The ECDH implementations operate on a packet representation of the private
|
||
|
|
* key.
|
||
|
|
*
|
||
|
|
* Return: -EINVAL if buffer has insufficient size, 0 on success
|
||
|
|
*/
|
||
|
|
int crypto_ecdh_encode_key(char *buf, unsigned int len, const struct ecdh *p);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* crypto_ecdh_decode_key() - decode a private key
|
||
|
|
* @buf: Buffer holding a packet key that should be decoded
|
||
|
|
* @len: Length of the packet private key buffer
|
||
|
|
* @p: Buffer allocated by the caller that is filled with the
|
||
|
|
* unpacket ECDH private key.
|
||
|
|
*
|
||
|
|
* The unpacking obtains the private key by pointing @p to the correct location
|
||
|
|
* in @buf. Thus, both pointers refer to the same memory.
|
||
|
|
*
|
||
|
|
* Return: -EINVAL if buffer has insufficient size, 0 on success
|
||
|
|
*/
|
||
|
|
int crypto_ecdh_decode_key(const char *buf, unsigned int len, struct ecdh *p);
|
||
|
|
|
||
|
|
#endif
|