// SPDX-License-Identifier: GPL-2.0-or-later/* * The ChaCha stream cipher (RFC7539) * * Copyright (C) 2015 Martin Willi */ #include <linux/kernel.h>#include <linux/export.h>#include <linux/module.h> #include <crypto/algapi.h> // for crypto_xor_cpy#include <crypto/chacha.h> void chacha_crypt_generic(u32 *state, u8 *dst, const u8 *src,			  unsigned int bytes, int nrounds){	/* aligned to potentially speed up crypto_xor() */	u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long)); 	while (bytes >= CHACHA_BLOCK_SIZE) {		chacha_block_generic(state, stream, nrounds);		crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE);		bytes -= CHACHA_BLOCK_SIZE;		dst += CHACHA_BLOCK_SIZE;		src += CHACHA_BLOCK_SIZE;	}	if (bytes) {		chacha_block_generic(state, stream, nrounds);		crypto_xor_cpy(dst, src, stream, bytes);	}}EXPORT_SYMBOL(chacha_crypt_generic); MODULE_DESCRIPTION("ChaCha stream cipher (RFC7539)");MODULE_LICENSE("GPL");