poly1305.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * OpenSSL/Cryptogams accelerated Poly1305 transform for ARM
 4 *
 5 * Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
 6 */
 7
 8#include <asm/hwcap.h>
 9#include <asm/simd.h>
10#include <linux/cpufeature.h>
11#include <linux/jump_label.h>
12#include <linux/kernel.h>
13
14asmlinkage void poly1305_block_init(struct poly1305_block_state *state,
15				    const u8 raw_key[POLY1305_BLOCK_SIZE]);
16asmlinkage void poly1305_blocks_arm(struct poly1305_block_state *state,
17				    const u8 *src, u32 len, u32 hibit);
18asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state,
19				     const u8 *src, u32 len, u32 hibit);
20asmlinkage void poly1305_emit(const struct poly1305_state *state,
21			      u8 digest[POLY1305_DIGEST_SIZE],
22			      const u32 nonce[4]);
23
24static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
25
26static void poly1305_blocks(struct poly1305_block_state *state, const u8 *src,
27			    unsigned int len, u32 padbit)
28{
29	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
30	    static_branch_likely(&have_neon) && likely(may_use_simd())) {
31		do {
32			unsigned int todo = min_t(unsigned int, len, SZ_4K);
33
34			scoped_ksimd()
35				poly1305_blocks_neon(state, src, todo, padbit);
36
37			len -= todo;
38			src += todo;
39		} while (len);
40	} else
41		poly1305_blocks_arm(state, src, len, padbit);
42}
43
44#ifdef CONFIG_KERNEL_MODE_NEON
45#define poly1305_mod_init_arch poly1305_mod_init_arch
46static void poly1305_mod_init_arch(void)
47{
48	if (elf_hwcap & HWCAP_NEON)
49		static_branch_enable(&have_neon);
50}
51#endif /* CONFIG_KERNEL_MODE_NEON */