1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum 4 * (SSE2 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_sse2(const u32 *key, const u8 *message, size_t message_len, 17 __le64 hash[NH_NUM_PASSES]); 18 19 static int nhpoly1305_sse2_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_fpu_begin(); 29 crypto_nhpoly1305_update_helper(desc, src, n, nh_sse2); 30 kernel_fpu_end(); 31 src += n; 32 srclen -= n; 33 } while (srclen); 34 return 0; 35 } 36 37 static int nhpoly1305_sse2_digest(struct shash_desc *desc, 38 const u8 *src, unsigned int srclen, u8 *out) 39 { 40 return crypto_nhpoly1305_init(desc) ?: 41 nhpoly1305_sse2_update(desc, src, srclen) ?: 42 crypto_nhpoly1305_final(desc, out); 43 } 44 45 static struct shash_alg nhpoly1305_alg = { 46 .base.cra_name = "nhpoly1305", 47 .base.cra_driver_name = "nhpoly1305-sse2", 48 .base.cra_priority = 200, 49 .base.cra_ctxsize = sizeof(struct nhpoly1305_key), 50 .base.cra_module = THIS_MODULE, 51 .digestsize = POLY1305_DIGEST_SIZE, 52 .init = crypto_nhpoly1305_init, 53 .update = nhpoly1305_sse2_update, 54 .final = crypto_nhpoly1305_final, 55 .digest = nhpoly1305_sse2_digest, 56 .setkey = crypto_nhpoly1305_setkey, 57 .descsize = sizeof(struct nhpoly1305_state), 58 }; 59 60 static int __init nhpoly1305_mod_init(void) 61 { 62 if (!boot_cpu_has(X86_FEATURE_XMM2)) 63 return -ENODEV; 64 65 return crypto_register_shash(&nhpoly1305_alg); 66 } 67 68 static void __exit nhpoly1305_mod_exit(void) 69 { 70 crypto_unregister_shash(&nhpoly1305_alg); 71 } 72 73 module_init(nhpoly1305_mod_init); 74 module_exit(nhpoly1305_mod_exit); 75 76 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (SSE2-accelerated)"); 77 MODULE_LICENSE("GPL v2"); 78 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); 79 MODULE_ALIAS_CRYPTO("nhpoly1305"); 80 MODULE_ALIAS_CRYPTO("nhpoly1305-sse2"); 81