linux/lib/crypto/chacha20poly1305.c

// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
 * Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
 *
 * This is an implementation of the ChaCha20Poly1305 AEAD construction.
 *
 * Information: https://tools.ietf.org/html/rfc8439
 */

#include <crypto/algapi.h>
#include <crypto/chacha20poly1305.h>
#include <crypto/chacha.h>
#include <crypto/poly1305.h>
#include <crypto/scatterwalk.h>

#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>

#define CHACHA_KEY_WORDS …

static void chacha_load_key(u32 *k, const u8 *in)
{ … }

static void xchacha_init(u32 *chacha_state, const u8 *key, const u8 *nonce)
{ … }

static void
__chacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
			   const u8 *ad, const size_t ad_len, u32 *chacha_state)
{ … }

void chacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
			      const u8 *ad, const size_t ad_len,
			      const u64 nonce,
			      const u8 key[CHACHA20POLY1305_KEY_SIZE])
{ … }
EXPORT_SYMBOL(…);

void xchacha20poly1305_encrypt(u8 *dst, const u8 *src, const size_t src_len,
			       const u8 *ad, const size_t ad_len,
			       const u8 nonce[XCHACHA20POLY1305_NONCE_SIZE],
			       const u8 key[CHACHA20POLY1305_KEY_SIZE])
{ … }
EXPORT_SYMBOL(…);

static bool
__chacha20poly1305_decrypt(u8 *dst, const u8 *src, const size_t src_len,
			   const u8 *ad, const size_t ad_len, u32 *chacha_state)
{ … }

bool chacha20poly1305_decrypt(u8 *dst, const u8 *src, const size_t src_len,
			      const u8 *ad, const size_t ad_len,
			      const u64 nonce,
			      const u8 key[CHACHA20POLY1305_KEY_SIZE])
{ … }
EXPORT_SYMBOL(…);

bool xchacha20poly1305_decrypt(u8 *dst, const u8 *src, const size_t src_len,
			       const u8 *ad, const size_t ad_len,
			       const u8 nonce[XCHACHA20POLY1305_NONCE_SIZE],
			       const u8 key[CHACHA20POLY1305_KEY_SIZE])
{ … }
EXPORT_SYMBOL(…);

static
bool chacha20poly1305_crypt_sg_inplace(struct scatterlist *src,
				       const size_t src_len,
				       const u8 *ad, const size_t ad_len,
				       const u64 nonce,
				       const u8 key[CHACHA20POLY1305_KEY_SIZE],
				       int encrypt)
{ … }

bool chacha20poly1305_encrypt_sg_inplace(struct scatterlist *src, size_t src_len,
					 const u8 *ad, const size_t ad_len,
					 const u64 nonce,
					 const u8 key[CHACHA20POLY1305_KEY_SIZE])
{ … }
EXPORT_SYMBOL(…);

bool chacha20poly1305_decrypt_sg_inplace(struct scatterlist *src, size_t src_len,
					 const u8 *ad, const size_t ad_len,
					 const u64 nonce,
					 const u8 key[CHACHA20POLY1305_KEY_SIZE])
{ … }
EXPORT_SYMBOL(…);

static int __init chacha20poly1305_init(void)
{ … }

static void __exit chacha20poly1305_exit(void)
{ … }

module_init(…) …;
module_exit(chacha20poly1305_exit);
MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;