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/sha.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(u32 *digest, const void *data, 28 unsigned 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, 37 (sha256_block_fn *)sha256_block_data_order); 38 } 39 EXPORT_SYMBOL(crypto_sha256_arm_update); 40 41 static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out) 42 { 43 sha256_base_do_finalize(desc, 44 (sha256_block_fn *)sha256_block_data_order); 45 return sha256_base_finish(desc, out); 46 } 47 48 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data, 49 unsigned int len, u8 *out) 50 { 51 sha256_base_do_update(desc, data, len, 52 (sha256_block_fn *)sha256_block_data_order); 53 return crypto_sha256_arm_final(desc, out); 54 } 55 EXPORT_SYMBOL(crypto_sha256_arm_finup); 56 57 static struct shash_alg algs[] = { { 58 .digestsize = SHA256_DIGEST_SIZE, 59 .init = sha256_base_init, 60 .update = crypto_sha256_arm_update, 61 .final = crypto_sha256_arm_final, 62 .finup = crypto_sha256_arm_finup, 63 .descsize = sizeof(struct sha256_state), 64 .base = { 65 .cra_name = "sha256", 66 .cra_driver_name = "sha256-asm", 67 .cra_priority = 150, 68 .cra_blocksize = SHA256_BLOCK_SIZE, 69 .cra_module = THIS_MODULE, 70 } 71 }, { 72 .digestsize = SHA224_DIGEST_SIZE, 73 .init = sha224_base_init, 74 .update = crypto_sha256_arm_update, 75 .final = crypto_sha256_arm_final, 76 .finup = crypto_sha256_arm_finup, 77 .descsize = sizeof(struct sha256_state), 78 .base = { 79 .cra_name = "sha224", 80 .cra_driver_name = "sha224-asm", 81 .cra_priority = 150, 82 .cra_blocksize = SHA224_BLOCK_SIZE, 83 .cra_module = THIS_MODULE, 84 } 85 } }; 86 87 static int __init sha256_mod_init(void) 88 { 89 int res = crypto_register_shashes(algs, ARRAY_SIZE(algs)); 90 91 if (res < 0) 92 return res; 93 94 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) { 95 res = crypto_register_shashes(sha256_neon_algs, 96 ARRAY_SIZE(sha256_neon_algs)); 97 98 if (res < 0) 99 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 100 } 101 102 return res; 103 } 104 105 static void __exit sha256_mod_fini(void) 106 { 107 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 108 109 if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) 110 crypto_unregister_shashes(sha256_neon_algs, 111 ARRAY_SIZE(sha256_neon_algs)); 112 } 113 114 module_init(sha256_mod_init); 115 module_exit(sha256_mod_fini); 116 117 MODULE_LICENSE("GPL"); 118 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON"); 119 120 MODULE_ALIAS_CRYPTO("sha256"); 121