arm/crypto/sha1_neon_glue.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
0004  * ARM NEON instructions.
0005  *
0006  * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
0007  *
0008  * This file is based on sha1_generic.c and sha1_ssse3_glue.c:
0009  *  Copyright (c) Alan Smithee.
0010  *  Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
0011  *  Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
0012  *  Copyright (c) Mathias Krause <minipli@googlemail.com>
0013  *  Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
0014  */
0015
0016 #include <crypto/internal/hash.h>
0017 #include <crypto/internal/simd.h>
0018 #include <linux/init.h>
0019 #include <linux/module.h>
0020 #include <linux/mm.h>
0021 #include <linux/types.h>
0022 #include <crypto/sha1.h>
0023 #include <crypto/sha1_base.h>
0024 #include <asm/neon.h>
0025 #include <asm/simd.h>
0026
0027 #include "sha1.h"
0028
0029 asmlinkage void sha1_transform_neon(void *state_h, const char *data,
0030                     unsigned int rounds);
0031
0032 static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
0033               unsigned int len)
0034 {
0035     struct sha1_state *sctx = shash_desc_ctx(desc);
0036
0037     if (!crypto_simd_usable() ||
0038         (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
0039         return sha1_update_arm(desc, data, len);
0040
0041     kernel_neon_begin();
0042     sha1_base_do_update(desc, data, len,
0043                 (sha1_block_fn *)sha1_transform_neon);
0044     kernel_neon_end();
0045
0046     return 0;
0047 }
0048
0049 static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
0050                unsigned int len, u8 *out)
0051 {
0052     if (!crypto_simd_usable())
0053         return sha1_finup_arm(desc, data, len, out);
0054
0055     kernel_neon_begin();
0056     if (len)
0057         sha1_base_do_update(desc, data, len,
0058                     (sha1_block_fn *)sha1_transform_neon);
0059     sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
0060     kernel_neon_end();
0061
0062     return sha1_base_finish(desc, out);
0063 }
0064
0065 static int sha1_neon_final(struct shash_desc *desc, u8 *out)
0066 {
0067     return sha1_neon_finup(desc, NULL, 0, out);
0068 }
0069
0070 static struct shash_alg alg = {
0071     .digestsize =   SHA1_DIGEST_SIZE,
0072     .init       =   sha1_base_init,
0073     .update     =   sha1_neon_update,
0074     .final      =   sha1_neon_final,
0075     .finup      =   sha1_neon_finup,
0076     .descsize   =   sizeof(struct sha1_state),
0077     .base       =   {
0078         .cra_name       = "sha1",
0079         .cra_driver_name    = "sha1-neon",
0080         .cra_priority       = 250,
0081         .cra_blocksize      = SHA1_BLOCK_SIZE,
0082         .cra_module     = THIS_MODULE,
0083     }
0084 };
0085
0086 static int __init sha1_neon_mod_init(void)
0087 {
0088     if (!cpu_has_neon())
0089         return -ENODEV;
0090
0091     return crypto_register_shash(&alg);
0092 }
0093
0094 static void __exit sha1_neon_mod_fini(void)
0095 {
0096     crypto_unregister_shash(&alg);
0097 }
0098
0099 module_init(sha1_neon_mod_init);
0100 module_exit(sha1_neon_mod_fini);
0101
0102 MODULE_LICENSE("GPL");
0103 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
0104 MODULE_ALIAS_CRYPTO("sha1");