1 /* 2 * Glue code for the SHA256 Secure Hash Algorithm assembly implementation 3 * using NEON instructions. 4 * 5 * Copyright © 2015 Google Inc. 6 * 7 * This file is based on sha512_neon_glue.c: 8 * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the Free 12 * Software Foundation; either version 2 of the License, or (at your option) 13 * any later version. 14 * 15 */ 16 17 #include <crypto/internal/hash.h> 18 #include <crypto/internal/simd.h> 19 #include <linux/cryptohash.h> 20 #include <linux/types.h> 21 #include <linux/string.h> 22 #include <crypto/sha.h> 23 #include <crypto/sha256_base.h> 24 #include <asm/byteorder.h> 25 #include <asm/simd.h> 26 #include <asm/neon.h> 27 28 #include "sha256_glue.h" 29 30 asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data, 31 unsigned int num_blks); 32 33 static int sha256_update(struct shash_desc *desc, const u8 *data, 34 unsigned int len) 35 { 36 struct sha256_state *sctx = shash_desc_ctx(desc); 37 38 if (!crypto_simd_usable() || 39 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 40 return crypto_sha256_arm_update(desc, data, len); 41 42 kernel_neon_begin(); 43 sha256_base_do_update(desc, data, len, 44 (sha256_block_fn *)sha256_block_data_order_neon); 45 kernel_neon_end(); 46 47 return 0; 48 } 49 50 static int sha256_finup(struct shash_desc *desc, const u8 *data, 51 unsigned int len, u8 *out) 52 { 53 if (!crypto_simd_usable()) 54 return crypto_sha256_arm_finup(desc, data, len, out); 55 56 kernel_neon_begin(); 57 if (len) 58 sha256_base_do_update(desc, data, len, 59 (sha256_block_fn *)sha256_block_data_order_neon); 60 sha256_base_do_finalize(desc, 61 (sha256_block_fn *)sha256_block_data_order_neon); 62 kernel_neon_end(); 63 64 return sha256_base_finish(desc, out); 65 } 66 67 static int sha256_final(struct shash_desc *desc, u8 *out) 68 { 69 return sha256_finup(desc, NULL, 0, out); 70 } 71 72 struct shash_alg sha256_neon_algs[] = { { 73 .digestsize = SHA256_DIGEST_SIZE, 74 .init = sha256_base_init, 75 .update = sha256_update, 76 .final = sha256_final, 77 .finup = sha256_finup, 78 .descsize = sizeof(struct sha256_state), 79 .base = { 80 .cra_name = "sha256", 81 .cra_driver_name = "sha256-neon", 82 .cra_priority = 250, 83 .cra_blocksize = SHA256_BLOCK_SIZE, 84 .cra_module = THIS_MODULE, 85 } 86 }, { 87 .digestsize = SHA224_DIGEST_SIZE, 88 .init = sha224_base_init, 89 .update = sha256_update, 90 .final = sha256_final, 91 .finup = sha256_finup, 92 .descsize = sizeof(struct sha256_state), 93 .base = { 94 .cra_name = "sha224", 95 .cra_driver_name = "sha224-neon", 96 .cra_priority = 250, 97 .cra_blocksize = SHA224_BLOCK_SIZE, 98 .cra_module = THIS_MODULE, 99 } 100 } }; 101