1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum 4 * (NEON accelerated version) 5 * 6 * Copyright 2018 Google LLC 7 */ 8 9 #include <asm/neon.h> 10 #include <asm/simd.h> 11 #include <crypto/internal/hash.h> 12 #include <crypto/internal/simd.h> 13 #include <crypto/nhpoly1305.h> 14 #include <linux/module.h> 15 16 asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len, 17 __le64 hash[NH_NUM_PASSES]); 18 19 static int nhpoly1305_neon_update(struct shash_desc *desc, 20 const u8 *src, unsigned int srclen) 21 { 22 if (srclen < 64 || !crypto_simd_usable()) 23 return crypto_nhpoly1305_update(desc, src, srclen); 24 25 do { 26 unsigned int n = min_t(unsigned int, srclen, SZ_4K); 27 28 kernel_neon_begin(); 29 crypto_nhpoly1305_update_helper(desc, src, n, nh_neon); 30 kernel_neon_end(); 31 src += n; 32 srclen -= n; 33 } while (srclen); 34 return 0; 35 } 36 37 static struct shash_alg nhpoly1305_alg = { 38 .base.cra_name = "nhpoly1305", 39 .base.cra_driver_name = "nhpoly1305-neon", 40 .base.cra_priority = 200, 41 .base.cra_ctxsize = sizeof(struct nhpoly1305_key), 42 .base.cra_module = THIS_MODULE, 43 .digestsize = POLY1305_DIGEST_SIZE, 44 .init = crypto_nhpoly1305_init, 45 .update = nhpoly1305_neon_update, 46 .final = crypto_nhpoly1305_final, 47 .setkey = crypto_nhpoly1305_setkey, 48 .descsize = sizeof(struct nhpoly1305_state), 49 }; 50 51 static int __init nhpoly1305_mod_init(void) 52 { 53 if (!(elf_hwcap & HWCAP_NEON)) 54 return -ENODEV; 55 56 return crypto_register_shash(&nhpoly1305_alg); 57 } 58 59 static void __exit nhpoly1305_mod_exit(void) 60 { 61 crypto_unregister_shash(&nhpoly1305_alg); 62 } 63 64 module_init(nhpoly1305_mod_init); 65 module_exit(nhpoly1305_mod_exit); 66 67 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (NEON-accelerated)"); 68 MODULE_LICENSE("GPL v2"); 69 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); 70 MODULE_ALIAS_CRYPTO("nhpoly1305"); 71 MODULE_ALIAS_CRYPTO("nhpoly1305-neon"); 72