1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using 4 * ARM NEON instructions. 5 * 6 * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> 7 * 8 * This file is based on sha1_generic.c and sha1_ssse3_glue.c: 9 * Copyright (c) Alan Smithee. 10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 11 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> 12 * Copyright (c) Mathias Krause <minipli@googlemail.com> 13 * Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com> 14 */ 15 16 #include <crypto/internal/hash.h> 17 #include <crypto/internal/simd.h> 18 #include <linux/init.h> 19 #include <linux/module.h> 20 #include <linux/mm.h> 21 #include <linux/cryptohash.h> 22 #include <linux/types.h> 23 #include <crypto/sha.h> 24 #include <crypto/sha1_base.h> 25 #include <asm/neon.h> 26 #include <asm/simd.h> 27 28 #include "sha1.h" 29 30 asmlinkage void sha1_transform_neon(void *state_h, const char *data, 31 unsigned int rounds); 32 33 static int sha1_neon_update(struct shash_desc *desc, const u8 *data, 34 unsigned int len) 35 { 36 struct sha1_state *sctx = shash_desc_ctx(desc); 37 38 if (!crypto_simd_usable() || 39 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 40 return sha1_update_arm(desc, data, len); 41 42 kernel_neon_begin(); 43 sha1_base_do_update(desc, data, len, 44 (sha1_block_fn *)sha1_transform_neon); 45 kernel_neon_end(); 46 47 return 0; 48 } 49 50 static int sha1_neon_finup(struct shash_desc *desc, const u8 *data, 51 unsigned int len, u8 *out) 52 { 53 if (!crypto_simd_usable()) 54 return sha1_finup_arm(desc, data, len, out); 55 56 kernel_neon_begin(); 57 if (len) 58 sha1_base_do_update(desc, data, len, 59 (sha1_block_fn *)sha1_transform_neon); 60 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon); 61 kernel_neon_end(); 62 63 return sha1_base_finish(desc, out); 64 } 65 66 static int sha1_neon_final(struct shash_desc *desc, u8 *out) 67 { 68 return sha1_neon_finup(desc, NULL, 0, out); 69 } 70 71 static struct shash_alg alg = { 72 .digestsize = SHA1_DIGEST_SIZE, 73 .init = sha1_base_init, 74 .update = sha1_neon_update, 75 .final = sha1_neon_final, 76 .finup = sha1_neon_finup, 77 .descsize = sizeof(struct sha1_state), 78 .base = { 79 .cra_name = "sha1", 80 .cra_driver_name = "sha1-neon", 81 .cra_priority = 250, 82 .cra_blocksize = SHA1_BLOCK_SIZE, 83 .cra_module = THIS_MODULE, 84 } 85 }; 86 87 static int __init sha1_neon_mod_init(void) 88 { 89 if (!cpu_has_neon()) 90 return -ENODEV; 91 92 return crypto_register_shash(&alg); 93 } 94 95 static void __exit sha1_neon_mod_fini(void) 96 { 97 crypto_unregister_shash(&alg); 98 } 99 100 module_init(sha1_neon_mod_init); 101 module_exit(sha1_neon_mod_fini); 102 103 MODULE_LICENSE("GPL"); 104 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated"); 105 MODULE_ALIAS_CRYPTO("sha1"); 106