// SPDX-License-Identifier: GPL-2.0-or-later/* * Poly1305 authenticator algorithm, RFC7539 * * Copyright (C) 2015 Martin Willi * * Based on public domain code by Andrew Moon and Daniel J. Bernstein. */ #include <crypto/internal/poly1305.h>#include <linux/export.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/string.h>#include <linux/unaligned.h> #ifdef CONFIG_CRYPTO_LIB_POLY1305_ARCH#include "poly1305.h" /* $(SRCARCH)/poly1305.h */#else#define poly1305_block_init	poly1305_block_init_generic#define poly1305_blocks		poly1305_blocks_generic#define poly1305_emit		poly1305_emit_generic#endif void poly1305_init(struct poly1305_desc_ctx *desc,		   const u8 key[POLY1305_KEY_SIZE]){	desc->s[0] = get_unaligned_le32(key + 16);	desc->s[1] = get_unaligned_le32(key + 20);	desc->s[2] = get_unaligned_le32(key + 24);	desc->s[3] = get_unaligned_le32(key + 28);	desc->buflen = 0;	poly1305_block_init(&desc->state, key);}EXPORT_SYMBOL(poly1305_init); void poly1305_update(struct poly1305_desc_ctx *desc,		     const u8 *src, unsigned int nbytes){	if (desc->buflen + nbytes >= POLY1305_BLOCK_SIZE) {		unsigned int bulk_len; 		if (desc->buflen) {			unsigned int l = POLY1305_BLOCK_SIZE - desc->buflen; 			memcpy(&desc->buf[desc->buflen], src, l);			src += l;			nbytes -= l; 			poly1305_blocks(&desc->state, desc->buf,					POLY1305_BLOCK_SIZE, 1);			desc->buflen = 0;		} 		bulk_len = round_down(nbytes, POLY1305_BLOCK_SIZE);		nbytes %= POLY1305_BLOCK_SIZE; 		if (bulk_len) {			poly1305_blocks(&desc->state, src, bulk_len, 1);			src += bulk_len;		}	}	if (nbytes) {		memcpy(&desc->buf[desc->buflen], src, nbytes);		desc->buflen += nbytes;	}}EXPORT_SYMBOL(poly1305_update); void poly1305_final(struct poly1305_desc_ctx *desc, u8 *dst){	if (unlikely(desc->buflen)) {		desc->buf[desc->buflen++] = 1;		memset(desc->buf + desc->buflen, 0,		       POLY1305_BLOCK_SIZE - desc->buflen);		poly1305_blocks(&desc->state, desc->buf, POLY1305_BLOCK_SIZE,				0);	} 	poly1305_emit(&desc->state.h, dst, desc->s);	*desc = (struct poly1305_desc_ctx){};}EXPORT_SYMBOL(poly1305_final); #ifdef poly1305_mod_init_archstatic int __init poly1305_mod_init(void){	poly1305_mod_init_arch();	return 0;}subsys_initcall(poly1305_mod_init); static void __exit poly1305_mod_exit(void){}module_exit(poly1305_mod_exit);#endif MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Poly1305 authenticator algorithm, RFC7539");