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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/lib/crypto/powerpc/poly1305-p10-glue.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * Poly1305 authenticator algorithm, RFC7539.

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 *

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 * Copyright 2023- IBM Corp. All rights reserved.

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 */

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#include <asm/switch_to.h>

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#include <crypto/internal/poly1305.h>

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#include <linux/cpufeature.h>

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#include <linux/jump_label.h>

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#include <linux/kernel.h>

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#include <linux/module.h>

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#include <linux/unaligned.h>

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asmlinkage void poly1305_p10le_4blocks(struct poly1305_block_state *state, const u8 *m, u32 mlen);

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asmlinkage void poly1305_64s(struct poly1305_block_state *state, const u8 *m, u32 mlen, int highbit);

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asmlinkage void poly1305_emit_64(const struct poly1305_state *state, const u32 nonce[4], u8 digest[POLY1305_DIGEST_SIZE]);

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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);

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static void vsx_begin(void)

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{

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	preempt_disable();

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	enable_kernel_vsx();

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}

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static void vsx_end(void)

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{

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	disable_kernel_vsx();

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	preempt_enable();

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}

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void poly1305_block_init_arch(struct poly1305_block_state *dctx,

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			      const u8 raw_key[POLY1305_BLOCK_SIZE])

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{

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	if (!static_key_enabled(&have_p10))

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		return poly1305_block_init_generic(dctx, raw_key);

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	dctx->h = (struct poly1305_state){};

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	dctx->core_r.key.r64[0] = get_unaligned_le64(raw_key + 0);

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	dctx->core_r.key.r64[1] = get_unaligned_le64(raw_key + 8);

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}

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EXPORT_SYMBOL_GPL(poly1305_block_init_arch);

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void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *src,

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			  unsigned int len, u32 padbit)

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{

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	if (!static_key_enabled(&have_p10))

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		return poly1305_blocks_generic(state, src, len, padbit);

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	vsx_begin();

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	if (len >= POLY1305_BLOCK_SIZE * 4) {

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		poly1305_p10le_4blocks(state, src, len);

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		src += len - (len % (POLY1305_BLOCK_SIZE * 4));

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		len %= POLY1305_BLOCK_SIZE * 4;

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	}

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	while (len >= POLY1305_BLOCK_SIZE) {

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		poly1305_64s(state, src, POLY1305_BLOCK_SIZE, padbit);

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		len -= POLY1305_BLOCK_SIZE;

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		src += POLY1305_BLOCK_SIZE;

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	}

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	vsx_end();

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}

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EXPORT_SYMBOL_GPL(poly1305_blocks_arch);

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void poly1305_emit_arch(const struct poly1305_state *state,

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			u8 digest[POLY1305_DIGEST_SIZE],

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			const u32 nonce[4])

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{

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	if (!static_key_enabled(&have_p10))

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		return poly1305_emit_generic(state, digest, nonce);

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	poly1305_emit_64(state, nonce, digest);

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}

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EXPORT_SYMBOL_GPL(poly1305_emit_arch);

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bool poly1305_is_arch_optimized(void)

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{

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	return static_key_enabled(&have_p10);

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}

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EXPORT_SYMBOL(poly1305_is_arch_optimized);

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static int __init poly1305_p10_init(void)

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{

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	if (cpu_has_feature(CPU_FTR_ARCH_31))

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		static_branch_enable(&have_p10);

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	return 0;

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}

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subsys_initcall(poly1305_p10_init);

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static void __exit poly1305_p10_exit(void)

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{

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}

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module_exit(poly1305_p10_exit);

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MODULE_LICENSE("GPL");

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MODULE_AUTHOR("Danny Tsen <[email protected]>");

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MODULE_DESCRIPTION("Optimized Poly1305 for P10");

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