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/types.h> 15 #include <linux/string.h> 16 #include <crypto/sha2.h> 17 #include <crypto/sha256_base.h> 18 #include <asm/byteorder.h> 19 #include <asm/simd.h> 20 #include <asm/neon.h> 21 22 #include "sha256_glue.h" 23 24 asmlinkage void sha256_block_data_order_neon(struct sha256_state *digest, 25 const u8 *data, int num_blks); 26 27 static int crypto_sha256_neon_update(struct shash_desc *desc, const u8 *data, 28 unsigned int len) 29 { 30 struct sha256_state *sctx = shash_desc_ctx(desc); 31 32 if (!crypto_simd_usable() || 33 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 34 return crypto_sha256_arm_update(desc, data, len); 35 36 kernel_neon_begin(); 37 sha256_base_do_update(desc, data, len, sha256_block_data_order_neon); 38 kernel_neon_end(); 39 40 return 0; 41 } 42 43 static int crypto_sha256_neon_finup(struct shash_desc *desc, const u8 *data, 44 unsigned int len, u8 *out) 45 { 46 if (!crypto_simd_usable()) 47 return crypto_sha256_arm_finup(desc, data, len, out); 48 49 kernel_neon_begin(); 50 if (len) 51 sha256_base_do_update(desc, data, len, 52 sha256_block_data_order_neon); 53 sha256_base_do_finalize(desc, sha256_block_data_order_neon); 54 kernel_neon_end(); 55 56 return sha256_base_finish(desc, out); 57 } 58 59 static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out) 60 { 61 return crypto_sha256_neon_finup(desc, NULL, 0, out); 62 } 63 64 struct shash_alg sha256_neon_algs[] = { { 65 .digestsize = SHA256_DIGEST_SIZE, 66 .init = sha256_base_init, 67 .update = crypto_sha256_neon_update, 68 .final = crypto_sha256_neon_final, 69 .finup = crypto_sha256_neon_finup, 70 .descsize = sizeof(struct sha256_state), 71 .base = { 72 .cra_name = "sha256", 73 .cra_driver_name = "sha256-neon", 74 .cra_priority = 250, 75 .cra_blocksize = SHA256_BLOCK_SIZE, 76 .cra_module = THIS_MODULE, 77 } 78 }, { 79 .digestsize = SHA224_DIGEST_SIZE, 80 .init = sha224_base_init, 81 .update = crypto_sha256_neon_update, 82 .final = crypto_sha256_neon_final, 83 .finup = crypto_sha256_neon_finup, 84 .descsize = sizeof(struct sha256_state), 85 .base = { 86 .cra_name = "sha224", 87 .cra_driver_name = "sha224-neon", 88 .cra_priority = 250, 89 .cra_blocksize = SHA224_BLOCK_SIZE, 90 .cra_module = THIS_MODULE, 91 } 92 } }; 93