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Release 4.12 include/crypto/dh.h

Directory: include/crypto
 * Diffie-Hellman secret to be used with kpp API along with helper functions
 * Copyright (c) 2016, Intel Corporation
 * Authors: Salvatore Benedetto <>
 * 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_DH_

#define _CRYPTO_DH_

 * DOC: DH Helper Functions
 * To use DH with the KPP cipher API, the following data structure and
 * functions should be used.
 * To use DH with KPP, the following functions should be used to operate on
 * a DH private key. The packet private key that can be set with
 * the KPP API function call of crypto_kpp_set_secret.

 * struct dh - define a DH private key
 * @key:        Private DH key
 * @p:          Diffie-Hellman parameter P
 * @g:          Diffie-Hellman generator G
 * @key_size:   Size of the private DH key
 * @p_size:     Size of DH parameter P
 * @g_size:     Size of DH generator G

struct dh {
void *key;
void *p;
void *g;
unsigned int key_size;
unsigned int p_size;
unsigned int g_size;

 * crypto_dh_key_len() - Obtain the size of the private DH key
 * @params:     private DH key
 * This function returns the packet DH key size. A caller can use that
 * with the provided DH private key reference to obtain the required
 * memory size to hold a packet key.
 * Return: size of the key in bytes
int crypto_dh_key_len(const struct dh *params);

 * crypto_dh_encode_key() - encode the private key
 * @buf:        Buffer allocated by the caller to hold the packet DH
 *              private key. The buffer should be at least crypto_dh_key_len
 *              bytes in size.
 * @len:        Length of the packet private key buffer
 * @params:     Buffer with the caller-specified private key
 * The DH implementations operate on a packet representation of the private
 * key.
 * Return:      -EINVAL if buffer has insufficient size, 0 on success
int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params);

 * crypto_dh_decode_key() - decode a private key
 * @buf:        Buffer holding a packet key that should be decoded
 * @len:        Lenth of the packet private key buffer
 * @params:     Buffer allocated by the caller that is filled with the
 *              unpacket DH 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_dh_decode_key(const char *buf, unsigned int len, struct dh *params);


Overall Contributors

Salvatore Benedetto8494.38%150.00%
Stephan Mueller55.62%150.00%
Directory: include/crypto
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