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/types.h> 22 #include <crypto/sha1.h> 23 #include <crypto/sha1_base.h> 24 #include <asm/neon.h> 25 #include <asm/simd.h> 26 27 #include "sha1.h" 28 29 asmlinkage void sha1_transform_neon(struct sha1_state *state_h, 30 const u8 *data, int rounds); 31 32 static int sha1_neon_update(struct shash_desc *desc, const u8 *data, 33 unsigned int len) 34 { 35 struct sha1_state *sctx = shash_desc_ctx(desc); 36 37 if (!crypto_simd_usable() || 38 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 39 return sha1_update_arm(desc, data, len); 40 41 kernel_neon_begin(); 42 sha1_base_do_update(desc, data, len, sha1_transform_neon); 43 kernel_neon_end(); 44 45 return 0; 46 } 47 48 static int sha1_neon_finup(struct shash_desc *desc, const u8 *data, 49 unsigned int len, u8 *out) 50 { 51 if (!crypto_simd_usable()) 52 return sha1_finup_arm(desc, data, len, out); 53 54 kernel_neon_begin(); 55 if (len) 56 sha1_base_do_update(desc, data, len, sha1_transform_neon); 57 sha1_base_do_finalize(desc, sha1_transform_neon); 58 kernel_neon_end(); 59 60 return sha1_base_finish(desc, out); 61 } 62 63 static int sha1_neon_final(struct shash_desc *desc, u8 *out) 64 { 65 return sha1_neon_finup(desc, NULL, 0, out); 66 } 67 68 static struct shash_alg alg = { 69 .digestsize = SHA1_DIGEST_SIZE, 70 .init = sha1_base_init, 71 .update = sha1_neon_update, 72 .final = sha1_neon_final, 73 .finup = sha1_neon_finup, 74 .descsize = sizeof(struct sha1_state), 75 .base = { 76 .cra_name = "sha1", 77 .cra_driver_name = "sha1-neon", 78 .cra_priority = 250, 79 .cra_blocksize = SHA1_BLOCK_SIZE, 80 .cra_module = THIS_MODULE, 81 } 82 }; 83 84 static int __init sha1_neon_mod_init(void) 85 { 86 if (!cpu_has_neon()) 87 return -ENODEV; 88 89 return crypto_register_shash(&alg); 90 } 91 92 static void __exit sha1_neon_mod_fini(void) 93 { 94 crypto_unregister_shash(&alg); 95 } 96 97 module_init(sha1_neon_mod_init); 98 module_exit(sha1_neon_mod_fini); 99 100 MODULE_LICENSE("GPL"); 101 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated"); 102 MODULE_ALIAS_CRYPTO("sha1"); 103