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(u32 *digest, const void *data, 25 unsigned 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, 38 (sha256_block_fn *)sha256_block_data_order_neon); 39 kernel_neon_end(); 40 41 return 0; 42 } 43 44 static int crypto_sha256_neon_finup(struct shash_desc *desc, const u8 *data, 45 unsigned int len, u8 *out) 46 { 47 if (!crypto_simd_usable()) 48 return crypto_sha256_arm_finup(desc, data, len, out); 49 50 kernel_neon_begin(); 51 if (len) 52 sha256_base_do_update(desc, data, len, 53 (sha256_block_fn *)sha256_block_data_order_neon); 54 sha256_base_do_finalize(desc, 55 (sha256_block_fn *)sha256_block_data_order_neon); 56 kernel_neon_end(); 57 58 return sha256_base_finish(desc, out); 59 } 60 61 static int crypto_sha256_neon_final(struct shash_desc *desc, u8 *out) 62 { 63 return crypto_sha256_neon_finup(desc, NULL, 0, out); 64 } 65 66 struct shash_alg sha256_neon_algs[] = { { 67 .digestsize = SHA256_DIGEST_SIZE, 68 .init = sha256_base_init, 69 .update = crypto_sha256_neon_update, 70 .final = crypto_sha256_neon_final, 71 .finup = crypto_sha256_neon_finup, 72 .descsize = sizeof(struct sha256_state), 73 .base = { 74 .cra_name = "sha256", 75 .cra_driver_name = "sha256-neon", 76 .cra_priority = 250, 77 .cra_blocksize = SHA256_BLOCK_SIZE, 78 .cra_module = THIS_MODULE, 79 } 80 }, { 81 .digestsize = SHA224_DIGEST_SIZE, 82 .init = sha224_base_init, 83 .update = crypto_sha256_neon_update, 84 .final = crypto_sha256_neon_final, 85 .finup = crypto_sha256_neon_finup, 86 .descsize = sizeof(struct sha256_state), 87 .base = { 88 .cra_name = "sha224", 89 .cra_driver_name = "sha224-neon", 90 .cra_priority = 250, 91 .cra_blocksize = SHA224_BLOCK_SIZE, 92 .cra_module = THIS_MODULE, 93 } 94 } }; 95