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/usr/src/linux-headers-5.4.0-132/include/crypto/

Edit File: chacha.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Common values and helper functions for the ChaCha and XChaCha stream ciphers.
 *
 * XChaCha extends ChaCha's nonce to 192 bits, while provably retaining ChaCha's
 * security.  Here they share the same key size, tfm context, and setkey
 * function; only their IV size and encrypt/decrypt function differ.
 *
 * The ChaCha paper specifies 20, 12, and 8-round variants.  In general, it is
 * recommended to use the 20-round variant ChaCha20.  However, the other
 * variants can be needed in some performance-sensitive scenarios.  The generic
 * ChaCha code currently allows only the 20 and 12-round variants.
 */

#ifndef _CRYPTO_CHACHA_H
#define _CRYPTO_CHACHA_H

#include <crypto/skcipher.h>
#include <linux/types.h>
#include <linux/crypto.h>

/* 32-bit stream position, then 96-bit nonce (RFC7539 convention) */
#define CHACHA_IV_SIZE		16

#define CHACHA_KEY_SIZE		32
#define CHACHA_BLOCK_SIZE	64
#define CHACHAPOLY_IV_SIZE	12

/* 192-bit nonce, then 64-bit stream position */
#define XCHACHA_IV_SIZE		32

struct chacha_ctx {
	u32 key[8];
	int nrounds;
};

void chacha_block(u32 *state, u8 *stream, int nrounds);
static inline void chacha20_block(u32 *state, u8 *stream)
{
	chacha_block(state, stream, 20);
}
void hchacha_block(const u32 *in, u32 *out, int nrounds);

void crypto_chacha_init(u32 *state, const struct chacha_ctx *ctx, const u8 *iv);

int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
			   unsigned int keysize);
int crypto_chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key,
			   unsigned int keysize);

int crypto_chacha_crypt(struct skcipher_request *req);
int crypto_xchacha_crypt(struct skcipher_request *req);

enum chacha_constants { /* expand 32-byte k */
	CHACHA_CONSTANT_EXPA = 0x61707865U,
	CHACHA_CONSTANT_ND_3 = 0x3320646eU,
	CHACHA_CONSTANT_2_BY = 0x79622d32U,
	CHACHA_CONSTANT_TE_K = 0x6b206574U
};

static inline void chacha_init_consts(u32 *state)
{
	state[0]  = CHACHA_CONSTANT_EXPA;
	state[1]  = CHACHA_CONSTANT_ND_3;
	state[2]  = CHACHA_CONSTANT_2_BY;
	state[3]  = CHACHA_CONSTANT_TE_K;
}

#endif /* _CRYPTO_CHACHA_H */

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Listing directory:

Name	Size	Modify	Owner/Group	Perms	Action	Select
acompress.h	8.01 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
aead.h	17.58 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
aes.h	2.5 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
akcipher.h	12.91 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
algapi.h	11.12 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
arc4.h	484 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
asym_tpm_subtype.h	521 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
authenc.h	635 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
b128ops.h	2.41 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
blake2s.h	2.37 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
blowfish.h	415 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
cast5.h	590 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
cast6.h	624 B	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
cast_common.h	232 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
cbc.h	3.29 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
chacha.h	2.08 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
cryptd.h	2 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
ctr.h	1.42 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
des.h	1.68 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
dh.h	2.51 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
drbg.h	8.99 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
ecdh.h	2.46 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
engine.h	3.9 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
gcm.h	867 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
gf128mul.h	9.41 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
ghash.h	388 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
hash.h	32.09 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
hash_info.h	972 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
hmac.h	173 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
if_alg.h	6.51 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
internal	DIR	16.11.2022 03:30:47	0/0	drwxr-xr-x	Edit Rename
kpp.h	9.9 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
md5.h	497 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
nhpoly1305.h	2.17 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
null.h	346 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
padlock.h	438 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
pcrypt.h	815 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
pkcs7.h	1.15 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
poly1305.h	1.72 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
public_key.h	2.34 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
rng.h	6.59 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
scatterwalk.h	3.14 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
serpent.h	696 B	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
sha.h	4.32 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
sha1_base.h	2.42 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
sha256_base.h	2.52 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
sha3.h	879 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
sha512_base.h	3.15 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
skcipher.h	20.98 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download
sm3.h	833 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
sm3_base.h	2.51 KB	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
sm4.h	754 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
streebog.h	949 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
twofish.h	755 B	25.11.2019 00:32:01	0/0	-rw-r--r--	Edit Rename Download
xts.h	1.35 KB	17.10.2022 15:19:41	0/0	-rw-r--r--	Edit Rename Download

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