projects / thirdparty / linux.git / blame
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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> | |
| f2abe0d7 | 10 | #include <crypto/internal/simd.h> |
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11 | #include <crypto/nhpoly1305.h> |
| 12 | #include <linux/module.h> | |
| f2abe0d7 | 13 | #include <asm/simd.h> |
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14 | |
| 15 | asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len, | |
| 16 | u8 hash[NH_HASH_BYTES]); | |
| 17 | ||
| 18 | /* wrapper to avoid indirect call to assembly, which doesn't work with CFI */ | |
| 19 | static void _nh_avx2(const u32 *key, const u8 *message, size_t message_len, | |
| 20 | __le64 hash[NH_NUM_PASSES]) | |
| 21 | { | |
| 22 | nh_avx2(key, message, message_len, (u8 *)hash); | |
| 23 | } | |
| 24 | ||
| 25 | static int nhpoly1305_avx2_update(struct shash_desc *desc, | |
| 26 | const u8 *src, unsigned int srclen) | |
| 27 | { | |
| f2abe0d7 | 28 | if (srclen < 64 || !crypto_simd_usable()) |
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29 | return crypto_nhpoly1305_update(desc, src, srclen); |
| 30 | ||
| 31 | do { | |
| a9a8ba90 | 32 | unsigned int n = min_t(unsigned int, srclen, SZ_4K); |
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33 | |
| 34 | kernel_fpu_begin(); | |
| 35 | crypto_nhpoly1305_update_helper(desc, src, n, _nh_avx2); | |
| 36 | kernel_fpu_end(); | |
| 37 | src += n; | |
| 38 | srclen -= n; | |
| 39 | } while (srclen); | |
| 40 | return 0; | |
| 41 | } | |
| 42 | ||
| 43 | static struct shash_alg nhpoly1305_alg = { | |
| 44 | .base.cra_name = "nhpoly1305", | |
| 45 | .base.cra_driver_name = "nhpoly1305-avx2", | |
| 46 | .base.cra_priority = 300, | |
| 47 | .base.cra_ctxsize = sizeof(struct nhpoly1305_key), | |
| 48 | .base.cra_module = THIS_MODULE, | |
| 49 | .digestsize = POLY1305_DIGEST_SIZE, | |
| 50 | .init = crypto_nhpoly1305_init, | |
| 51 | .update = nhpoly1305_avx2_update, | |
| 52 | .final = crypto_nhpoly1305_final, | |
| 53 | .setkey = crypto_nhpoly1305_setkey, | |
| 54 | .descsize = sizeof(struct nhpoly1305_state), | |
| 55 | }; | |
| 56 | ||
| 57 | static int __init nhpoly1305_mod_init(void) | |
| 58 | { | |
| 59 | if (!boot_cpu_has(X86_FEATURE_AVX2) || | |
| 60 | !boot_cpu_has(X86_FEATURE_OSXSAVE)) | |
| 61 | return -ENODEV; | |
| 62 | ||
| 63 | return crypto_register_shash(&nhpoly1305_alg); | |
| 64 | } | |
| 65 | ||
| 66 | static void __exit nhpoly1305_mod_exit(void) | |
| 67 | { | |
| 68 | crypto_unregister_shash(&nhpoly1305_alg); | |
| 69 | } | |
| 70 | ||
| 71 | module_init(nhpoly1305_mod_init); | |
| 72 | module_exit(nhpoly1305_mod_exit); | |
| 73 | ||
| 74 | MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (AVX2-accelerated)"); | |
| 75 | MODULE_LICENSE("GPL v2"); | |
| 76 | MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); | |
| 77 | MODULE_ALIAS_CRYPTO("nhpoly1305"); | |
| 78 | MODULE_ALIAS_CRYPTO("nhpoly1305-avx2"); |