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/* SPDX-License-Identifier: GPL-2.0 */
/*
* NIST SP800-90A DRBG derivation function
*
* Copyright (C) 2014, Stephan Mueller <smueller@chronox.de>
*/
#ifndef _INTERNAL_DRBG_H
#define _INTERNAL_DRBG_H
/*
* Convert an integer into a byte representation of this integer.
* The byte representation is big-endian
*
* @val value to be converted
* @buf buffer holding the converted integer -- caller must ensure that
* buffer size is at least 32 bit
*/
static inline void drbg_cpu_to_be32(__u32 val, unsigned char *buf)
{
struct s {
__be32 conv;
};
struct s *conversion = (struct s *)buf;
conversion->conv = cpu_to_be32(val);
}
/*
* Concatenation Helper and string operation helper
*
* SP800-90A requires the concatenation of different data. To avoid copying
* buffers around or allocate additional memory, the following data structure
* is used to point to the original memory with its size. In addition, it
* is used to build a linked list. The linked list defines the concatenation
* of individual buffers. The order of memory block referenced in that
* linked list determines the order of concatenation.
*/
struct drbg_string {
const unsigned char *buf;
size_t len;
struct list_head list;
};
static inline void drbg_string_fill(struct drbg_string *string,
const unsigned char *buf, size_t len)
{
string->buf = buf;
string->len = len;
INIT_LIST_HEAD(&string->list);
}
#endif //_INTERNAL_DRBG_H
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