1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Glue code for the SHA256 Secure Hash Algorithm assembly implementation 4 * using optimized ARM assembler and NEON instructions. 5 * 6 * Copyright © 2015 Google Inc. 7 * 8 * This file is based on sha256_ssse3_glue.c: 9 * Copyright (C) 2013 Intel Corporation 10 * Author: Tim Chen <tim.c.chen@linux.intel.com> 11 */ 12 13 #include <crypto/internal/hash.h> 14 #include <linux/crypto.h> 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/mm.h> 18 #include <linux/types.h> 19 #include <linux/string.h> 20 #include <crypto/sha2.h> 21 #include <crypto/sha256_base.h> 22 #include <asm/simd.h> 23 #include <asm/neon.h> 24 25 #include "sha256_glue.h" 26 27 asmlinkage void sha256_block_data_order(struct sha256_state *state, 28 const u8 *data, int num_blks); 29 30 int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data, 31 unsigned int len) 32 { 33 /* make sure casting to sha256_block_fn() is safe */ 34 BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0); 35 36 return sha256_base_do_update(desc, data, len, sha256_block_data_order); 37 } 38 EXPORT_SYMBOL(crypto_sha256_arm_update); 39 40 static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out) 41 { 42 sha256_base_do_finalize(desc, sha256_block_data_order); 43 return sha256_base_finish(desc, out); 44 } 45 46 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data, 47 unsigned int len, u8 *out) 48 { 49 sha256_base_do_update(desc, data, len, sha256_block_data_order); 50 return crypto_sha256_arm_final(desc, out); 51 } 52 EXPORT_SYMBOL(crypto_sha256_arm_finup); 53 54 static struct shash_alg algs[] = { { 55 .digestsize = SHA256_DIGEST_SIZE, 56 .init = sha256_base_init, 57 .update = crypto_sha256_arm_update, 58 .final = crypto_sha256_arm_final, 59 .finup = crypto_sha256_arm_finup, 60 .descsize = sizeof(struct sha256_state), 61 .base = { 62 .cra_name = "sha256", 63 .cra_driver_name = "sha256-asm", 64 .cra_priority = 150, 65 .cra_blocksize = SHA256_BLOCK_SIZE, 66 .cra_module = THIS_MODULE, 67 } 68 }, { 69 .digestsize = SHA224_DIGEST_SIZE, 70 .init = sha224_base_init, 71 .update = crypto_sha256_arm_update, 72 .final = crypto_sha256_arm_final, 73 .finup = crypto_sha256_arm_finup, 74 .descsize = sizeof(struct sha256_state), 75 .base = { 76 .cra_name = "sha224", 77 .cra_driver_name = "sha224-asm", 78 .cra_priority = 150, 79 .cra_blocksize = SHA224_BLOCK_SIZE, 80 .cra_module = THIS_MODULE, 81 } 82 } }; 83 84 static int __init sha256_mod_init(void) 85 { 86 int res = crypto_register_shashes(algs, ARRAY_SIZE(algs)); 87 88 if (res < 0) 89 return res; 90 91 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) { 92 res = crypto_register_shashes(sha256_neon_algs, 93 ARRAY_SIZE(sha256_neon_algs)); 94 95 if (res < 0) 96 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 97 } 98 99 return res; 100 } 101 102 static void __exit sha256_mod_fini(void) 103 { 104 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 105 106 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) 107 crypto_unregister_shashes(sha256_neon_algs, 108 ARRAY_SIZE(sha256_neon_algs)); 109 } 110 111 module_init(sha256_mod_init); 112 module_exit(sha256_mod_fini); 113 114 MODULE_LICENSE("GPL"); 115 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON"); 116 117 MODULE_ALIAS_CRYPTO("sha256"); 118