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82 lines
2.4 KiB
82 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* ECDH params to be used with kpp API |
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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_ECDH_ |
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#define _CRYPTO_ECDH_ |
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/** |
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* DOC: ECDH Helper Functions |
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* |
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* To use ECDH 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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* The ECC curves known to the ECDH implementation are specified in this |
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* header file. |
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* |
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* To use ECDH with KPP, the following functions should be used to operate on |
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* an ECDH 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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/* Curves IDs */ |
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#define ECC_CURVE_NIST_P192 0x0001 |
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#define ECC_CURVE_NIST_P256 0x0002 |
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#define ECC_CURVE_NIST_P384 0x0003 |
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/** |
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* struct ecdh - define an ECDH private key |
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* |
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* @key: Private ECDH key |
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* @key_size: Size of the private ECDH key |
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*/ |
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struct ecdh { |
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char *key; |
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unsigned short key_size; |
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}; |
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/** |
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* crypto_ecdh_key_len() - Obtain the size of the private ECDH key |
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* @params: private ECDH key |
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* |
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* This function returns the packet ECDH key size. A caller can use that |
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* with the provided ECDH 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_ecdh_key_len(const struct ecdh *params); |
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/** |
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* crypto_ecdh_encode_key() - encode the private key |
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* @buf: Buffer allocated by the caller to hold the packet ECDH |
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* private key. The buffer should be at least crypto_ecdh_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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* @p: Buffer with the caller-specified private key |
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* |
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* The ECDH 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_ecdh_encode_key(char *buf, unsigned int len, const struct ecdh *p); |
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/** |
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* crypto_ecdh_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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* @p: Buffer allocated by the caller that is filled with the |
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* unpacked ECDH 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_ecdh_decode_key(const char *buf, unsigned int len, struct ecdh *p); |
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#endif
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