1 /* 2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions 3 * 4 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <asm/neon.h> 12 #include <asm/simd.h> 13 #include <asm/unaligned.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/internal/simd.h> 16 #include <crypto/sha.h> 17 #include <crypto/sha256_base.h> 18 #include <linux/cpufeature.h> 19 #include <linux/crypto.h> 20 #include <linux/module.h> 21 22 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 24 MODULE_LICENSE("GPL v2"); 25 26 struct sha256_ce_state { 27 struct sha256_state sst; 28 u32 finalize; 29 }; 30 31 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, 32 int blocks); 33 34 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 35 sst.count); 36 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 37 finalize); 38 39 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 40 41 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 42 unsigned int len) 43 { 44 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 45 46 if (!crypto_simd_usable()) 47 return sha256_base_do_update(desc, data, len, 48 (sha256_block_fn *)sha256_block_data_order); 49 50 sctx->finalize = 0; 51 kernel_neon_begin(); 52 sha256_base_do_update(desc, data, len, 53 (sha256_block_fn *)sha2_ce_transform); 54 kernel_neon_end(); 55 56 return 0; 57 } 58 59 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 60 unsigned int len, u8 *out) 61 { 62 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 63 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE); 64 65 if (!crypto_simd_usable()) { 66 if (len) 67 sha256_base_do_update(desc, data, len, 68 (sha256_block_fn *)sha256_block_data_order); 69 sha256_base_do_finalize(desc, 70 (sha256_block_fn *)sha256_block_data_order); 71 return sha256_base_finish(desc, out); 72 } 73 74 /* 75 * Allow the asm code to perform the finalization if there is no 76 * partial data and the input is a round multiple of the block size. 77 */ 78 sctx->finalize = finalize; 79 80 kernel_neon_begin(); 81 sha256_base_do_update(desc, data, len, 82 (sha256_block_fn *)sha2_ce_transform); 83 if (!finalize) 84 sha256_base_do_finalize(desc, 85 (sha256_block_fn *)sha2_ce_transform); 86 kernel_neon_end(); 87 return sha256_base_finish(desc, out); 88 } 89 90 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 91 { 92 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 93 94 if (!crypto_simd_usable()) { 95 sha256_base_do_finalize(desc, 96 (sha256_block_fn *)sha256_block_data_order); 97 return sha256_base_finish(desc, out); 98 } 99 100 sctx->finalize = 0; 101 kernel_neon_begin(); 102 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 103 kernel_neon_end(); 104 return sha256_base_finish(desc, out); 105 } 106 107 static struct shash_alg algs[] = { { 108 .init = sha224_base_init, 109 .update = sha256_ce_update, 110 .final = sha256_ce_final, 111 .finup = sha256_ce_finup, 112 .descsize = sizeof(struct sha256_ce_state), 113 .digestsize = SHA224_DIGEST_SIZE, 114 .base = { 115 .cra_name = "sha224", 116 .cra_driver_name = "sha224-ce", 117 .cra_priority = 200, 118 .cra_blocksize = SHA256_BLOCK_SIZE, 119 .cra_module = THIS_MODULE, 120 } 121 }, { 122 .init = sha256_base_init, 123 .update = sha256_ce_update, 124 .final = sha256_ce_final, 125 .finup = sha256_ce_finup, 126 .descsize = sizeof(struct sha256_ce_state), 127 .digestsize = SHA256_DIGEST_SIZE, 128 .base = { 129 .cra_name = "sha256", 130 .cra_driver_name = "sha256-ce", 131 .cra_priority = 200, 132 .cra_blocksize = SHA256_BLOCK_SIZE, 133 .cra_module = THIS_MODULE, 134 } 135 } }; 136 137 static int __init sha2_ce_mod_init(void) 138 { 139 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 140 } 141 142 static void __exit sha2_ce_mod_fini(void) 143 { 144 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 145 } 146 147 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 148 module_exit(sha2_ce_mod_fini); 149