1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Glue code for the SHA256 Secure Hash Algorithm assembly implementation 4 * using NEON instructions. 5 * 6 * Copyright © 2015 Google Inc. 7 * 8 * This file is based on sha512_neon_glue.c: 9 * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> 10 */ 11 12 #include <crypto/internal/hash.h> 13 #include <crypto/internal/simd.h> 14 #include <linux/cryptohash.h> 15 #include <linux/types.h> 16 #include <linux/string.h> 17 #include <crypto/sha.h> 18 #include <crypto/sha256_base.h> 19 #include <asm/byteorder.h> 20 #include <asm/simd.h> 21 #include <asm/neon.h> 22 23 #include "sha256_glue.h" 24 25 asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data, 26 unsigned int num_blks); 27 28 static int sha256_update(struct shash_desc *desc, const u8 *data, 29 unsigned int len) 30 { 31 struct sha256_state *sctx = shash_desc_ctx(desc); 32 33 if (!crypto_simd_usable() || 34 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 35 return crypto_sha256_arm_update(desc, data, len); 36 37 kernel_neon_begin(); 38 sha256_base_do_update(desc, data, len, 39 (sha256_block_fn *)sha256_block_data_order_neon); 40 kernel_neon_end(); 41 42 return 0; 43 } 44 45 static int sha256_finup(struct shash_desc *desc, const u8 *data, 46 unsigned int len, u8 *out) 47 { 48 if (!crypto_simd_usable()) 49 return crypto_sha256_arm_finup(desc, data, len, out); 50 51 kernel_neon_begin(); 52 if (len) 53 sha256_base_do_update(desc, data, len, 54 (sha256_block_fn *)sha256_block_data_order_neon); 55 sha256_base_do_finalize(desc, 56 (sha256_block_fn *)sha256_block_data_order_neon); 57 kernel_neon_end(); 58 59 return sha256_base_finish(desc, out); 60 } 61 62 static int sha256_final(struct shash_desc *desc, u8 *out) 63 { 64 return sha256_finup(desc, NULL, 0, out); 65 } 66 67 struct shash_alg sha256_neon_algs[] = { { 68 .digestsize = SHA256_DIGEST_SIZE, 69 .init = sha256_base_init, 70 .update = sha256_update, 71 .final = sha256_final, 72 .finup = sha256_finup, 73 .descsize = sizeof(struct sha256_state), 74 .base = { 75 .cra_name = "sha256", 76 .cra_driver_name = "sha256-neon", 77 .cra_priority = 250, 78 .cra_blocksize = SHA256_BLOCK_SIZE, 79 .cra_module = THIS_MODULE, 80 } 81 }, { 82 .digestsize = SHA224_DIGEST_SIZE, 83 .init = sha224_base_init, 84 .update = sha256_update, 85 .final = sha256_final, 86 .finup = sha256_finup, 87 .descsize = sizeof(struct sha256_state), 88 .base = { 89 .cra_name = "sha224", 90 .cra_driver_name = "sha224-neon", 91 .cra_priority = 250, 92 .cra_blocksize = SHA224_BLOCK_SIZE, 93 .cra_module = THIS_MODULE, 94 } 95 } }; 96