1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum 4 * (AVX2 accelerated version) 5 * 6 * Copyright 2018 Google LLC 7 */ 8 9 #include <crypto/internal/hash.h> 10 #include <crypto/internal/simd.h> 11 #include <crypto/nhpoly1305.h> 12 #include <linux/module.h> 13 #include <linux/sizes.h> 14 #include <asm/simd.h> 15 16 asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len, 17 u8 hash[NH_HASH_BYTES]); 18 19 /* wrapper to avoid indirect call to assembly, which doesn't work with CFI */ 20 static void _nh_avx2(const u32 *key, const u8 *message, size_t message_len, 21 __le64 hash[NH_NUM_PASSES]) 22 { 23 nh_avx2(key, message, message_len, (u8 *)hash); 24 } 25 26 static int nhpoly1305_avx2_update(struct shash_desc *desc, 27 const u8 *src, unsigned int srclen) 28 { 29 if (srclen < 64 || !crypto_simd_usable()) 30 return crypto_nhpoly1305_update(desc, src, srclen); 31 32 do { 33 unsigned int n = min_t(unsigned int, srclen, SZ_4K); 34 35 kernel_fpu_begin(); 36 crypto_nhpoly1305_update_helper(desc, src, n, _nh_avx2); 37 kernel_fpu_end(); 38 src += n; 39 srclen -= n; 40 } while (srclen); 41 return 0; 42 } 43 44 static struct shash_alg nhpoly1305_alg = { 45 .base.cra_name = "nhpoly1305", 46 .base.cra_driver_name = "nhpoly1305-avx2", 47 .base.cra_priority = 300, 48 .base.cra_ctxsize = sizeof(struct nhpoly1305_key), 49 .base.cra_module = THIS_MODULE, 50 .digestsize = POLY1305_DIGEST_SIZE, 51 .init = crypto_nhpoly1305_init, 52 .update = nhpoly1305_avx2_update, 53 .final = crypto_nhpoly1305_final, 54 .setkey = crypto_nhpoly1305_setkey, 55 .descsize = sizeof(struct nhpoly1305_state), 56 }; 57 58 static int __init nhpoly1305_mod_init(void) 59 { 60 if (!boot_cpu_has(X86_FEATURE_AVX2) || 61 !boot_cpu_has(X86_FEATURE_OSXSAVE)) 62 return -ENODEV; 63 64 return crypto_register_shash(&nhpoly1305_alg); 65 } 66 67 static void __exit nhpoly1305_mod_exit(void) 68 { 69 crypto_unregister_shash(&nhpoly1305_alg); 70 } 71 72 module_init(nhpoly1305_mod_init); 73 module_exit(nhpoly1305_mod_exit); 74 75 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (AVX2-accelerated)"); 76 MODULE_LICENSE("GPL v2"); 77 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); 78 MODULE_ALIAS_CRYPTO("nhpoly1305"); 79 MODULE_ALIAS_CRYPTO("nhpoly1305-avx2"); 80