1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions 4 * 5 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <asm/neon.h> 9 #include <asm/simd.h> 10 #include <asm/unaligned.h> 11 #include <crypto/internal/hash.h> 12 #include <crypto/internal/simd.h> 13 #include <crypto/sha2.h> 14 #include <crypto/sha256_base.h> 15 #include <linux/cpufeature.h> 16 #include <linux/crypto.h> 17 #include <linux/module.h> 18 19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 21 MODULE_LICENSE("GPL v2"); 22 MODULE_ALIAS_CRYPTO("sha224"); 23 MODULE_ALIAS_CRYPTO("sha256"); 24 25 struct sha256_ce_state { 26 struct sha256_state sst; 27 u32 finalize; 28 }; 29 30 extern const u32 sha256_ce_offsetof_count; 31 extern const u32 sha256_ce_offsetof_finalize; 32 33 asmlinkage int sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, 34 int blocks); 35 36 static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src, 37 int blocks) 38 { 39 while (blocks) { 40 int rem; 41 42 kernel_neon_begin(); 43 rem = sha2_ce_transform(container_of(sst, struct sha256_ce_state, 44 sst), src, blocks); 45 kernel_neon_end(); 46 src += (blocks - rem) * SHA256_BLOCK_SIZE; 47 blocks = rem; 48 } 49 } 50 51 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 52 sst.count); 53 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 54 finalize); 55 56 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 57 58 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src, 59 int blocks) 60 { 61 sha256_block_data_order(sst->state, src, blocks); 62 } 63 64 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 65 unsigned int len) 66 { 67 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 68 69 if (!crypto_simd_usable()) 70 return sha256_base_do_update(desc, data, len, 71 __sha256_block_data_order); 72 73 sctx->finalize = 0; 74 sha256_base_do_update(desc, data, len, __sha2_ce_transform); 75 76 return 0; 77 } 78 79 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 80 unsigned int len, u8 *out) 81 { 82 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 83 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len; 84 85 if (!crypto_simd_usable()) { 86 if (len) 87 sha256_base_do_update(desc, data, len, 88 __sha256_block_data_order); 89 sha256_base_do_finalize(desc, __sha256_block_data_order); 90 return sha256_base_finish(desc, out); 91 } 92 93 /* 94 * Allow the asm code to perform the finalization if there is no 95 * partial data and the input is a round multiple of the block size. 96 */ 97 sctx->finalize = finalize; 98 99 sha256_base_do_update(desc, data, len, __sha2_ce_transform); 100 if (!finalize) 101 sha256_base_do_finalize(desc, __sha2_ce_transform); 102 return sha256_base_finish(desc, out); 103 } 104 105 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 106 { 107 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 108 109 if (!crypto_simd_usable()) { 110 sha256_base_do_finalize(desc, __sha256_block_data_order); 111 return sha256_base_finish(desc, out); 112 } 113 114 sctx->finalize = 0; 115 sha256_base_do_finalize(desc, __sha2_ce_transform); 116 return sha256_base_finish(desc, out); 117 } 118 119 static int sha256_ce_export(struct shash_desc *desc, void *out) 120 { 121 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 122 123 memcpy(out, &sctx->sst, sizeof(struct sha256_state)); 124 return 0; 125 } 126 127 static int sha256_ce_import(struct shash_desc *desc, const void *in) 128 { 129 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 130 131 memcpy(&sctx->sst, in, sizeof(struct sha256_state)); 132 sctx->finalize = 0; 133 return 0; 134 } 135 136 static struct shash_alg algs[] = { { 137 .init = sha224_base_init, 138 .update = sha256_ce_update, 139 .final = sha256_ce_final, 140 .finup = sha256_ce_finup, 141 .export = sha256_ce_export, 142 .import = sha256_ce_import, 143 .descsize = sizeof(struct sha256_ce_state), 144 .statesize = sizeof(struct sha256_state), 145 .digestsize = SHA224_DIGEST_SIZE, 146 .base = { 147 .cra_name = "sha224", 148 .cra_driver_name = "sha224-ce", 149 .cra_priority = 200, 150 .cra_blocksize = SHA256_BLOCK_SIZE, 151 .cra_module = THIS_MODULE, 152 } 153 }, { 154 .init = sha256_base_init, 155 .update = sha256_ce_update, 156 .final = sha256_ce_final, 157 .finup = sha256_ce_finup, 158 .export = sha256_ce_export, 159 .import = sha256_ce_import, 160 .descsize = sizeof(struct sha256_ce_state), 161 .statesize = sizeof(struct sha256_state), 162 .digestsize = SHA256_DIGEST_SIZE, 163 .base = { 164 .cra_name = "sha256", 165 .cra_driver_name = "sha256-ce", 166 .cra_priority = 200, 167 .cra_blocksize = SHA256_BLOCK_SIZE, 168 .cra_module = THIS_MODULE, 169 } 170 } }; 171 172 static int __init sha2_ce_mod_init(void) 173 { 174 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 175 } 176 177 static void __exit sha2_ce_mod_fini(void) 178 { 179 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 180 } 181 182 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 183 module_exit(sha2_ce_mod_fini); 184