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 <linux/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 __sha256_ce_transform(struct sha256_ce_state *sst, u8 const *src, 34 int blocks); 35 36 static void sha256_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 = __sha256_ce_transform(container_of(sst, 44 struct sha256_ce_state, 45 sst), src, blocks); 46 kernel_neon_end(); 47 src += (blocks - rem) * SHA256_BLOCK_SIZE; 48 blocks = rem; 49 } 50 } 51 52 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 53 sst.count); 54 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 55 finalize); 56 57 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 58 59 static void sha256_arm64_transform(struct sha256_state *sst, u8 const *src, 60 int blocks) 61 { 62 sha256_block_data_order(sst->state, src, blocks); 63 } 64 65 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 66 unsigned int len) 67 { 68 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 69 70 if (!crypto_simd_usable()) 71 return sha256_base_do_update(desc, data, len, 72 sha256_arm64_transform); 73 74 sctx->finalize = 0; 75 sha256_base_do_update(desc, data, len, sha256_ce_transform); 76 77 return 0; 78 } 79 80 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 81 unsigned int len, u8 *out) 82 { 83 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 84 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len; 85 86 if (!crypto_simd_usable()) { 87 if (len) 88 sha256_base_do_update(desc, data, len, 89 sha256_arm64_transform); 90 sha256_base_do_finalize(desc, sha256_arm64_transform); 91 return sha256_base_finish(desc, out); 92 } 93 94 /* 95 * Allow the asm code to perform the finalization if there is no 96 * partial data and the input is a round multiple of the block size. 97 */ 98 sctx->finalize = finalize; 99 100 sha256_base_do_update(desc, data, len, sha256_ce_transform); 101 if (!finalize) 102 sha256_base_do_finalize(desc, sha256_ce_transform); 103 return sha256_base_finish(desc, out); 104 } 105 106 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 107 { 108 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 109 110 if (!crypto_simd_usable()) { 111 sha256_base_do_finalize(desc, sha256_arm64_transform); 112 return sha256_base_finish(desc, out); 113 } 114 115 sctx->finalize = 0; 116 sha256_base_do_finalize(desc, sha256_ce_transform); 117 return sha256_base_finish(desc, out); 118 } 119 120 static int sha256_ce_digest(struct shash_desc *desc, const u8 *data, 121 unsigned int len, u8 *out) 122 { 123 sha256_base_init(desc); 124 return sha256_ce_finup(desc, data, len, out); 125 } 126 127 static int sha256_ce_export(struct shash_desc *desc, void *out) 128 { 129 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 130 131 memcpy(out, &sctx->sst, sizeof(struct sha256_state)); 132 return 0; 133 } 134 135 static int sha256_ce_import(struct shash_desc *desc, const void *in) 136 { 137 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 138 139 memcpy(&sctx->sst, in, sizeof(struct sha256_state)); 140 sctx->finalize = 0; 141 return 0; 142 } 143 144 static struct shash_alg algs[] = { { 145 .init = sha224_base_init, 146 .update = sha256_ce_update, 147 .final = sha256_ce_final, 148 .finup = sha256_ce_finup, 149 .export = sha256_ce_export, 150 .import = sha256_ce_import, 151 .descsize = sizeof(struct sha256_ce_state), 152 .statesize = sizeof(struct sha256_state), 153 .digestsize = SHA224_DIGEST_SIZE, 154 .base = { 155 .cra_name = "sha224", 156 .cra_driver_name = "sha224-ce", 157 .cra_priority = 200, 158 .cra_blocksize = SHA256_BLOCK_SIZE, 159 .cra_module = THIS_MODULE, 160 } 161 }, { 162 .init = sha256_base_init, 163 .update = sha256_ce_update, 164 .final = sha256_ce_final, 165 .finup = sha256_ce_finup, 166 .digest = sha256_ce_digest, 167 .export = sha256_ce_export, 168 .import = sha256_ce_import, 169 .descsize = sizeof(struct sha256_ce_state), 170 .statesize = sizeof(struct sha256_state), 171 .digestsize = SHA256_DIGEST_SIZE, 172 .base = { 173 .cra_name = "sha256", 174 .cra_driver_name = "sha256-ce", 175 .cra_priority = 200, 176 .cra_blocksize = SHA256_BLOCK_SIZE, 177 .cra_module = THIS_MODULE, 178 } 179 } }; 180 181 static int __init sha2_ce_mod_init(void) 182 { 183 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 184 } 185 186 static void __exit sha2_ce_mod_fini(void) 187 { 188 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 189 } 190 191 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 192 module_exit(sha2_ce_mod_fini); 193