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TOMOYO Linux Cross Reference
Linux/include/crypto/dh.h

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  1 /*
  2  * Diffie-Hellman secret to be used with kpp API along with helper functions
  3  *
  4  * Copyright (c) 2016, Intel Corporation
  5  * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License as published by the Free
  9  * Software Foundation; either version 2 of the License, or (at your option)
 10  * any later version.
 11  *
 12  */
 13 #ifndef _CRYPTO_DH_
 14 #define _CRYPTO_DH_
 15 
 16 /**
 17  * DOC: DH Helper Functions
 18  *
 19  * To use DH with the KPP cipher API, the following data structure and
 20  * functions should be used.
 21  *
 22  * To use DH with KPP, the following functions should be used to operate on
 23  * a DH private key. The packet private key that can be set with
 24  * the KPP API function call of crypto_kpp_set_secret.
 25  */
 26 
 27 /**
 28  * struct dh - define a DH private key
 29  *
 30  * @key:        Private DH key
 31  * @p:          Diffie-Hellman parameter P
 32  * @g:          Diffie-Hellman generator G
 33  * @key_size:   Size of the private DH key
 34  * @p_size:     Size of DH parameter P
 35  * @g_size:     Size of DH generator G
 36  */
 37 struct dh {
 38         void *key;
 39         void *p;
 40         void *g;
 41         unsigned int key_size;
 42         unsigned int p_size;
 43         unsigned int g_size;
 44 };
 45 
 46 /**
 47  * crypto_dh_key_len() - Obtain the size of the private DH key
 48  * @params:     private DH key
 49  *
 50  * This function returns the packet DH key size. A caller can use that
 51  * with the provided DH private key reference to obtain the required
 52  * memory size to hold a packet key.
 53  *
 54  * Return: size of the key in bytes
 55  */
 56 unsigned int crypto_dh_key_len(const struct dh *params);
 57 
 58 /**
 59  * crypto_dh_encode_key() - encode the private key
 60  * @buf:        Buffer allocated by the caller to hold the packet DH
 61  *              private key. The buffer should be at least crypto_dh_key_len
 62  *              bytes in size.
 63  * @len:        Length of the packet private key buffer
 64  * @params:     Buffer with the caller-specified private key
 65  *
 66  * The DH implementations operate on a packet representation of the private
 67  * key.
 68  *
 69  * Return:      -EINVAL if buffer has insufficient size, 0 on success
 70  */
 71 int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params);
 72 
 73 /**
 74  * crypto_dh_decode_key() - decode a private key
 75  * @buf:        Buffer holding a packet key that should be decoded
 76  * @len:        Length of the packet private key buffer
 77  * @params:     Buffer allocated by the caller that is filled with the
 78  *              unpacked DH private key.
 79  *
 80  * The unpacking obtains the private key by pointing @p to the correct location
 81  * in @buf. Thus, both pointers refer to the same memory.
 82  *
 83  * Return:      -EINVAL if buffer has insufficient size, 0 on success
 84  */
 85 int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params);
 86 
 87 #endif
 88 

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