mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
16766292c6
This reverts commit c66d7ebbe2.
Link: https://lore.kernel.org/all/02c22854-eebf-4ad1-b89e-8c2b65ab8236@csgroup.eu/
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
// 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 <dtsen@linux.ibm.com>");
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MODULE_DESCRIPTION("Optimized Poly1305 for P10");
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