403Webshell
Server IP : 172.67.216.182  /  Your IP : 162.158.106.111
Web Server : Apache
System : Linux krdc-ubuntu-s-2vcpu-4gb-amd-blr1-01.localdomain 5.15.0-142-generic #152-Ubuntu SMP Mon May 19 10:54:31 UTC 2025 x86_64
User : www ( 1000)
PHP Version : 7.4.33
Disable Function : passthru,exec,system,putenv,chroot,chgrp,chown,shell_exec,popen,proc_open,pcntl_exec,ini_alter,ini_restore,dl,openlog,syslog,readlink,symlink,popepassthru,pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,imap_open,apache_setenv
MySQL : OFF  |  cURL : ON  |  WGET : ON  |  Perl : ON  |  Python : OFF  |  Sudo : ON  |  Pkexec : ON
Directory :  /usr/src/linux-headers-5.15.0-142/include/crypto/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :


[ Back ]     

Current File : /usr/src/linux-headers-5.15.0-142/include/crypto/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 <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 */

Youez - 2016 - github.com/yon3zu
LinuXploit