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

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * Diffie-Hellman secret to be used with kpp API along with helper functions
  4  *
  5  * Copyright (c) 2016, Intel Corporation
  6  * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
  7  */
  8 #ifndef _CRYPTO_DH_
  9 #define _CRYPTO_DH_
 10 
 11 /**
 12  * DOC: DH Helper Functions
 13  *
 14  * To use DH with the KPP cipher API, the following data structure and
 15  * functions should be used.
 16  *
 17  * To use DH with KPP, the following functions should be used to operate on
 18  * a DH private key. The packet private key that can be set with
 19  * the KPP API function call of crypto_kpp_set_secret.
 20  */
 21 
 22 /**
 23  * struct dh - define a DH private key
 24  *
 25  * @key:        Private DH key
 26  * @p:          Diffie-Hellman parameter P
 27  * @q:          Diffie-Hellman parameter Q
 28  * @g:          Diffie-Hellman generator G
 29  * @key_size:   Size of the private DH key
 30  * @p_size:     Size of DH parameter P
 31  * @q_size:     Size of DH parameter Q
 32  * @g_size:     Size of DH generator G
 33  */
 34 struct dh {
 35         void *key;
 36         void *p;
 37         void *q;
 38         void *g;
 39         unsigned int key_size;
 40         unsigned int p_size;
 41         unsigned int q_size;
 42         unsigned int g_size;
 43 };
 44 
 45 /**
 46  * crypto_dh_key_len() - Obtain the size of the private DH key
 47  * @params:     private DH key
 48  *
 49  * This function returns the packet DH key size. A caller can use that
 50  * with the provided DH private key reference to obtain the required
 51  * memory size to hold a packet key.
 52  *
 53  * Return: size of the key in bytes
 54  */
 55 unsigned int crypto_dh_key_len(const struct dh *params);
 56 
 57 /**
 58  * crypto_dh_encode_key() - encode the private key
 59  * @buf:        Buffer allocated by the caller to hold the packet DH
 60  *              private key. The buffer should be at least crypto_dh_key_len
 61  *              bytes in size.
 62  * @len:        Length of the packet private key buffer
 63  * @params:     Buffer with the caller-specified private key
 64  *
 65  * The DH implementations operate on a packet representation of the private
 66  * key.
 67  *
 68  * Return:      -EINVAL if buffer has insufficient size, 0 on success
 69  */
 70 int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params);
 71 
 72 /**
 73  * crypto_dh_decode_key() - decode a private key
 74  * @buf:        Buffer holding a packet key that should be decoded
 75  * @len:        Length of the packet private key buffer
 76  * @params:     Buffer allocated by the caller that is filled with the
 77  *              unpacked DH private key.
 78  *
 79  * The unpacking obtains the private key by pointing @p to the correct location
 80  * in @buf. Thus, both pointers refer to the same memory.
 81  *
 82  * Return:      -EINVAL if buffer has insufficient size, 0 on success
 83  */
 84 int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params);
 85 
 86 #endif
 87 

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