Gecko [ tsuru-no-tsurugi.tokyo ]

Name	Size	Permission	Date
internal	[ DIR ]	drwxr-xr-x	2026-06-27 06:50
acompress.h	8.86 KB	-rw-r--r--	2021-11-01 05:53
aead.h	18.39 KB	-rw-r--r--	2021-11-01 05:53
aes.h	2.5 KB	-rw-r--r--	2021-11-01 05:53
akcipher.h	12.92 KB	-rw-r--r--	2021-11-01 05:53
algapi.h	7.37 KB	-rw-r--r--	2026-06-20 00:54
arc4.h	484 B	-rw-r--r--	2021-11-01 05:53
asym_tpm_subtype.h	521 B	-rw-r--r--	2021-11-01 05:53
authenc.h	635 B	-rw-r--r--	2021-11-01 05:53
b128ops.h	2.41 KB	-rw-r--r--	2021-11-01 05:53
blake2b.h	1.6 KB	-rw-r--r--	2021-11-01 05:53
blake2s.h	2.62 KB	-rw-r--r--	2026-06-20 00:54
blowfish.h	415 B	-rw-r--r--	2021-11-01 05:53
cast5.h	590 B	-rw-r--r--	2021-11-01 05:53
cast6.h	607 B	-rw-r--r--	2021-11-01 05:53
cast_common.h	232 B	-rw-r--r--	2021-11-01 05:53
chacha.h	3.32 KB	-rw-r--r--	2026-06-20 00:54
chacha20poly1305.h	1.66 KB	-rw-r--r--	2021-11-01 05:53
cryptd.h	2 KB	-rw-r--r--	2021-11-01 05:53
ctr.h	1.42 KB	-rw-r--r--	2021-11-01 05:53
curve25519.h	2.02 KB	-rw-r--r--	2021-11-01 05:53
des.h	1.68 KB	-rw-r--r--	2021-11-01 05:53
dh.h	2.51 KB	-rw-r--r--	2021-11-01 05:53
drbg.h	8.99 KB	-rw-r--r--	2026-06-20 00:54
ecc_curve.h	1.31 KB	-rw-r--r--	2021-11-01 05:53
ecdh.h	2.43 KB	-rw-r--r--	2021-11-01 05:53
engine.h	4.11 KB	-rw-r--r--	2021-11-01 05:53
gcm.h	867 B	-rw-r--r--	2021-11-01 05:53
gf128mul.h	9.42 KB	-rw-r--r--	2021-11-01 05:53
ghash.h	388 B	-rw-r--r--	2021-11-01 05:53
hash.h	34.04 KB	-rw-r--r--	2021-11-01 05:53
hash_info.h	998 B	-rw-r--r--	2021-11-01 05:53
hmac.h	173 B	-rw-r--r--	2021-11-01 05:53
if_alg.h	6.68 KB	-rw-r--r--	2026-06-20 00:54
kpp.h	9.91 KB	-rw-r--r--	2021-11-01 05:53
md5.h	497 B	-rw-r--r--	2021-11-01 05:53
nhpoly1305.h	2.18 KB	-rw-r--r--	2021-11-01 05:53
null.h	346 B	-rw-r--r--	2021-11-01 05:53
padlock.h	438 B	-rw-r--r--	2021-11-01 05:53
pcrypt.h	815 B	-rw-r--r--	2021-11-01 05:53
pkcs7.h	1.15 KB	-rw-r--r--	2021-11-01 05:53
poly1305.h	2.44 KB	-rw-r--r--	2021-11-01 05:53
public_key.h	2.38 KB	-rw-r--r--	2021-11-01 05:53
rng.h	6.59 KB	-rw-r--r--	2021-11-01 05:53
scatterwalk.h	3.9 KB	-rw-r--r--	2026-06-20 00:54
serpent.h	696 B	-rw-r--r--	2021-11-01 05:53
sha1.h	1.18 KB	-rw-r--r--	2021-11-01 05:53
sha1_base.h	2.45 KB	-rw-r--r--	2021-11-01 05:53
sha2.h	3.76 KB	-rw-r--r--	2021-11-01 05:53
sha256_base.h	2.56 KB	-rw-r--r--	2021-11-01 05:53
sha3.h	879 B	-rw-r--r--	2021-11-01 05:53
sha512_base.h	3.18 KB	-rw-r--r--	2021-11-01 05:53
skcipher.h	19.95 KB	-rw-r--r--	2021-11-01 05:53
sm2.h	749 B	-rw-r--r--	2021-11-01 05:53
sm3.h	897 B	-rw-r--r--	2021-11-01 05:53
sm3_base.h	2.55 KB	-rw-r--r--	2021-11-01 05:53
sm4.h	1.12 KB	-rw-r--r--	2021-11-01 05:53
streebog.h	949 B	-rw-r--r--	2021-11-01 05:53
twofish.h	743 B	-rw-r--r--	2021-11-01 05:53
xts.h	1.1 KB	-rw-r--r--	2021-11-01 05:53

Rename

/* 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 <asm/unaligned.h>
#include <linux/types.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

#define CHACHA_STATE_WORDS	(CHACHA_BLOCK_SIZE / sizeof(u32))

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

void chacha_block_generic(u32 *state, u8 *stream, int nrounds);
static inline void chacha20_block(u32 *state, u8 *stream)
{
	chacha_block_generic(state, stream, 20);
}

void hchacha_block_arch(const u32 *state, u32 *out, int nrounds);
void hchacha_block_generic(const u32 *state, u32 *out, int nrounds);

static inline void hchacha_block(const u32 *state, u32 *out, int nrounds)
{
	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CHACHA))
		hchacha_block_arch(state, out, nrounds);
	else
		hchacha_block_generic(state, out, nrounds);
}

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;
}

void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv);
static inline void chacha_init_generic(u32 *state, const u32 *key, const u8 *iv)
{
	chacha_init_consts(state);
	state[4]  = key[0];
	state[5]  = key[1];
	state[6]  = key[2];
	state[7]  = key[3];
	state[8]  = key[4];
	state[9]  = key[5];
	state[10] = key[6];
	state[11] = key[7];
	state[12] = get_unaligned_le32(iv +  0);
	state[13] = get_unaligned_le32(iv +  4);
	state[14] = get_unaligned_le32(iv +  8);
	state[15] = get_unaligned_le32(iv + 12);
}

static inline void chacha_init(u32 *state, const u32 *key, const u8 *iv)
{
	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CHACHA))
		chacha_init_arch(state, key, iv);
	else
		chacha_init_generic(state, key, iv);
}

void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src,
		       unsigned int bytes, int nrounds);
void chacha_crypt_generic(u32 *state, u8 *dst, const u8 *src,
			  unsigned int bytes, int nrounds);

static inline void chacha_crypt(u32 *state, u8 *dst, const u8 *src,
				unsigned int bytes, int nrounds)
{
	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CHACHA))
		chacha_crypt_arch(state, dst, src, bytes, nrounds);
	else
		chacha_crypt_generic(state, dst, src, bytes, nrounds);
}

static inline void chacha20_crypt(u32 *state, u8 *dst, const u8 *src,
				  unsigned int bytes)
{
	chacha_crypt(state, dst, src, bytes, 20);
}

#endif /* _CRYPTO_CHACHA_H */