// SPDX-License-Identifier: GPL-2.0-or-later/* * The ChaCha stream cipher (RFC7539) * * Copyright (C) 2015 Martin Willi */ #include <crypto/chacha.h>#include <crypto/utils.h>#include <linux/export.h>#include <linux/kernel.h>#include <linux/module.h> static void __maybe_unusedchacha_crypt_generic(struct chacha_state *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);	}} #ifdef CONFIG_CRYPTO_LIB_CHACHA_ARCH#include "chacha.h" /* $(SRCARCH)/chacha.h */#else#define chacha_crypt_arch chacha_crypt_generic#define hchacha_block_arch hchacha_block_generic#endif void chacha_crypt(struct chacha_state *state, u8 *dst, const u8 *src,		  unsigned int bytes, int nrounds){	chacha_crypt_arch(state, dst, src, bytes, nrounds);}EXPORT_SYMBOL_GPL(chacha_crypt); void hchacha_block(const struct chacha_state *state,		   u32 out[HCHACHA_OUT_WORDS], int nrounds){	hchacha_block_arch(state, out, nrounds);}EXPORT_SYMBOL_GPL(hchacha_block); #ifdef chacha_mod_init_archstatic int __init chacha_mod_init(void){	chacha_mod_init_arch();	return 0;}subsys_initcall(chacha_mod_init); static void __exit chacha_mod_exit(void){}module_exit(chacha_mod_exit);#endif MODULE_DESCRIPTION("ChaCha stream cipher (RFC7539)");MODULE_LICENSE("GPL");