1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * BLAKE2b digest algorithm, NEON accelerated 4 * 5 * Copyright 2020 Google LLC 6 */ 7 8 #include <crypto/internal/blake2b.h> 9 #include <crypto/internal/hash.h> 10 #include <crypto/internal/simd.h> 11 12 #include <linux/module.h> 13 #include <linux/sizes.h> 14 15 #include <asm/neon.h> 16 #include <asm/simd.h> 17 18 asmlinkage void blake2b_compress_neon(struct blake2b_state *state, 19 const u8 *block, size_t nblocks, u32 inc); 20 21 static void blake2b_compress_arch(struct blake2b_state *state, 22 const u8 *block, size_t nblocks, u32 inc) 23 { 24 if (!crypto_simd_usable()) { 25 blake2b_compress_generic(state, block, nblocks, inc); 26 return; 27 } 28 29 do { 30 const size_t blocks = min_t(size_t, nblocks, 31 SZ_4K / BLAKE2B_BLOCK_SIZE); 32 33 kernel_neon_begin(); 34 blake2b_compress_neon(state, block, blocks, inc); 35 kernel_neon_end(); 36 37 nblocks -= blocks; 38 block += blocks * BLAKE2B_BLOCK_SIZE; 39 } while (nblocks); 40 } 41 42 static int crypto_blake2b_update_neon(struct shash_desc *desc, 43 const u8 *in, unsigned int inlen) 44 { 45 return crypto_blake2b_update(desc, in, inlen, blake2b_compress_arch); 46 } 47 48 static int crypto_blake2b_final_neon(struct shash_desc *desc, u8 *out) 49 { 50 return crypto_blake2b_final(desc, out, blake2b_compress_arch); 51 } 52 53 #define BLAKE2B_ALG(name, driver_name, digest_size) \ 54 { \ 55 .base.cra_name = name, \ 56 .base.cra_driver_name = driver_name, \ 57 .base.cra_priority = 200, \ 58 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, \ 59 .base.cra_blocksize = BLAKE2B_BLOCK_SIZE, \ 60 .base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \ 61 .base.cra_module = THIS_MODULE, \ 62 .digestsize = digest_size, \ 63 .setkey = crypto_blake2b_setkey, \ 64 .init = crypto_blake2b_init, \ 65 .update = crypto_blake2b_update_neon, \ 66 .final = crypto_blake2b_final_neon, \ 67 .descsize = sizeof(struct blake2b_state), \ 68 } 69 70 static struct shash_alg blake2b_neon_algs[] = { 71 BLAKE2B_ALG("blake2b-160", "blake2b-160-neon", BLAKE2B_160_HASH_SIZE), 72 BLAKE2B_ALG("blake2b-256", "blake2b-256-neon", BLAKE2B_256_HASH_SIZE), 73 BLAKE2B_ALG("blake2b-384", "blake2b-384-neon", BLAKE2B_384_HASH_SIZE), 74 BLAKE2B_ALG("blake2b-512", "blake2b-512-neon", BLAKE2B_512_HASH_SIZE), 75 }; 76 77 static int __init blake2b_neon_mod_init(void) 78 { 79 if (!(elf_hwcap & HWCAP_NEON)) 80 return -ENODEV; 81 82 return crypto_register_shashes(blake2b_neon_algs, 83 ARRAY_SIZE(blake2b_neon_algs)); 84 } 85 86 static void __exit blake2b_neon_mod_exit(void) 87 { 88 return crypto_unregister_shashes(blake2b_neon_algs, 89 ARRAY_SIZE(blake2b_neon_algs)); 90 } 91 92 module_init(blake2b_neon_mod_init); 93 module_exit(blake2b_neon_mod_exit); 94 95 MODULE_DESCRIPTION("BLAKE2b digest algorithm, NEON accelerated"); 96 MODULE_LICENSE("GPL"); 97 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); 98 MODULE_ALIAS_CRYPTO("blake2b-160"); 99 MODULE_ALIAS_CRYPTO("blake2b-160-neon"); 100 MODULE_ALIAS_CRYPTO("blake2b-256"); 101 MODULE_ALIAS_CRYPTO("blake2b-256-neon"); 102 MODULE_ALIAS_CRYPTO("blake2b-384"); 103 MODULE_ALIAS_CRYPTO("blake2b-384-neon"); 104 MODULE_ALIAS_CRYPTO("blake2b-512"); 105 MODULE_ALIAS_CRYPTO("blake2b-512-neon"); 106