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crypto: drbg - Export CTR DRBG DF functions

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Export drbg_ctr_df() derivative function to new module df_sp80090.

Signed-off-by: Harsh Jain <h.jain@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Harsh Jain
2025-09-15 19:00:25 +05:30
committed by Herbert Xu
parent 3a86608788
commit 6c4fed5fee
8 changed files with 343 additions and 265 deletions
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27
include/crypto/df_sp80090a.h Normal file
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@@ -0,0 +1,27 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright Stephan Mueller <smueller@chronox.de>, 2014
*/
#ifndef _CRYPTO_DF80090A_H
#define _CRYPTO_DF80090A_H
#include <crypto/internal/cipher.h>
static inline int crypto_drbg_ctr_df_datalen(u8 statelen, u8 blocklen)
{
return statelen + /* df_data */
blocklen + /* pad */
blocklen + /* iv */
statelen + blocklen; /* temp */
}
int crypto_drbg_ctr_df(struct crypto_cipher *tfm,
unsigned char *df_data,
size_t bytes_to_return,
struct list_head *seedlist,
u8 blocklen_bytes,
u8 statelen);
#endif /* _CRYPTO_DF80090A_H */

25
include/crypto/drbg.h
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@@ -47,6 +47,7 @@
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/slab.h>
#include <crypto/internal/drbg.h>
#include <crypto/internal/rng.h>
#include <crypto/rng.h>
#include <linux/fips.h>
@@ -54,30 +55,6 @@
#include <linux/list.h>
#include <linux/workqueue.h>
/*
* 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);
}
struct drbg_state;
typedef uint32_t drbg_flag_t;

54
include/crypto/internal/drbg.h Normal file
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@@ -0,0 +1,54 @@
/* 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