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86 lines
2.5 KiB
86 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Diffie-Hellman secret to be used with kpp API along with helper functions |
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* |
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* Copyright (c) 2016, Intel Corporation |
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* Authors: Salvatore Benedetto <[email protected]> |
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*/ |
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#ifndef _CRYPTO_DH_ |
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#define _CRYPTO_DH_ |
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/** |
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* DOC: DH Helper Functions |
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* |
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* To use DH with the KPP cipher API, the following data structure and |
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* functions should be used. |
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* |
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* To use DH with KPP, the following functions should be used to operate on |
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* a DH private key. The packet private key that can be set with |
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* the KPP API function call of crypto_kpp_set_secret. |
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*/ |
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/** |
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* struct dh - define a DH private key |
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* |
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* @key: Private DH key |
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* @p: Diffie-Hellman parameter P |
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* @q: Diffie-Hellman parameter Q |
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* @g: Diffie-Hellman generator G |
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* @key_size: Size of the private DH key |
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* @p_size: Size of DH parameter P |
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* @q_size: Size of DH parameter Q |
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* @g_size: Size of DH generator G |
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*/ |
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struct dh { |
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void *key; |
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void *p; |
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void *q; |
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void *g; |
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unsigned int key_size; |
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unsigned int p_size; |
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unsigned int q_size; |
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unsigned int g_size; |
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}; |
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/** |
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* crypto_dh_key_len() - Obtain the size of the private DH key |
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* @params: private DH key |
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* |
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* This function returns the packet DH key size. A caller can use that |
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* with the provided DH private key reference to obtain the required |
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* memory size to hold a packet key. |
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* |
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* Return: size of the key in bytes |
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*/ |
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unsigned int crypto_dh_key_len(const struct dh *params); |
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/** |
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* crypto_dh_encode_key() - encode the private key |
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* @buf: Buffer allocated by the caller to hold the packet DH |
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* private key. The buffer should be at least crypto_dh_key_len |
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* bytes in size. |
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* @len: Length of the packet private key buffer |
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* @params: Buffer with the caller-specified private key |
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* |
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* The DH implementations operate on a packet representation of the private |
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* key. |
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* |
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* Return: -EINVAL if buffer has insufficient size, 0 on success |
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*/ |
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int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params); |
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/** |
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* crypto_dh_decode_key() - decode a private key |
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* @buf: Buffer holding a packet key that should be decoded |
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* @len: Length of the packet private key buffer |
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* @params: Buffer allocated by the caller that is filled with the |
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* unpacked DH private key. |
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* |
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* The unpacking obtains the private key by pointing @p to the correct location |
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* in @buf. Thus, both pointers refer to the same memory. |
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* |
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* Return: -EINVAL if buffer has insufficient size, 0 on success |
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*/ |
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int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params); |
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#endif
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