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/sha.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 23 struct sha256_ce_state { 24 struct sha256_state sst; 25 u32 finalize; 26 }; 27 28 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, 29 int blocks); 30 31 static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src, 32 int blocks) 33 { 34 sha2_ce_transform(container_of(sst, struct sha256_ce_state, sst), src, 35 blocks); 36 } 37 38 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 39 sst.count); 40 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 41 finalize); 42 43 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 44 45 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src, 46 int blocks) 47 { 48 sha256_block_data_order(sst->state, src, blocks); 49 } 50 51 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 52 unsigned int len) 53 { 54 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 55 56 if (!crypto_simd_usable()) 57 return sha256_base_do_update(desc, data, len, 58 __sha256_block_data_order); 59 60 sctx->finalize = 0; 61 kernel_neon_begin(); 62 sha256_base_do_update(desc, data, len, __sha2_ce_transform); 63 kernel_neon_end(); 64 65 return 0; 66 } 67 68 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 69 unsigned int len, u8 *out) 70 { 71 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 72 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len; 73 74 if (!crypto_simd_usable()) { 75 if (len) 76 sha256_base_do_update(desc, data, len, 77 __sha256_block_data_order); 78 sha256_base_do_finalize(desc, __sha256_block_data_order); 79 return sha256_base_finish(desc, out); 80 } 81 82 /* 83 * Allow the asm code to perform the finalization if there is no 84 * partial data and the input is a round multiple of the block size. 85 */ 86 sctx->finalize = finalize; 87 88 kernel_neon_begin(); 89 sha256_base_do_update(desc, data, len, __sha2_ce_transform); 90 if (!finalize) 91 sha256_base_do_finalize(desc, __sha2_ce_transform); 92 kernel_neon_end(); 93 return sha256_base_finish(desc, out); 94 } 95 96 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 97 { 98 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 99 100 if (!crypto_simd_usable()) { 101 sha256_base_do_finalize(desc, __sha256_block_data_order); 102 return sha256_base_finish(desc, out); 103 } 104 105 sctx->finalize = 0; 106 kernel_neon_begin(); 107 sha256_base_do_finalize(desc, __sha2_ce_transform); 108 kernel_neon_end(); 109 return sha256_base_finish(desc, out); 110 } 111 112 static int sha256_ce_export(struct shash_desc *desc, void *out) 113 { 114 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 115 116 memcpy(out, &sctx->sst, sizeof(struct sha256_state)); 117 return 0; 118 } 119 120 static int sha256_ce_import(struct shash_desc *desc, const void *in) 121 { 122 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 123 124 memcpy(&sctx->sst, in, sizeof(struct sha256_state)); 125 sctx->finalize = 0; 126 return 0; 127 } 128 129 static struct shash_alg algs[] = { { 130 .init = sha224_base_init, 131 .update = sha256_ce_update, 132 .final = sha256_ce_final, 133 .finup = sha256_ce_finup, 134 .export = sha256_ce_export, 135 .import = sha256_ce_import, 136 .descsize = sizeof(struct sha256_ce_state), 137 .statesize = sizeof(struct sha256_state), 138 .digestsize = SHA224_DIGEST_SIZE, 139 .base = { 140 .cra_name = "sha224", 141 .cra_driver_name = "sha224-ce", 142 .cra_priority = 200, 143 .cra_blocksize = SHA256_BLOCK_SIZE, 144 .cra_module = THIS_MODULE, 145 } 146 }, { 147 .init = sha256_base_init, 148 .update = sha256_ce_update, 149 .final = sha256_ce_final, 150 .finup = sha256_ce_finup, 151 .export = sha256_ce_export, 152 .import = sha256_ce_import, 153 .descsize = sizeof(struct sha256_ce_state), 154 .statesize = sizeof(struct sha256_state), 155 .digestsize = SHA256_DIGEST_SIZE, 156 .base = { 157 .cra_name = "sha256", 158 .cra_driver_name = "sha256-ce", 159 .cra_priority = 200, 160 .cra_blocksize = SHA256_BLOCK_SIZE, 161 .cra_module = THIS_MODULE, 162 } 163 } }; 164 165 static int __init sha2_ce_mod_init(void) 166 { 167 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 168 } 169 170 static void __exit sha2_ce_mod_fini(void) 171 { 172 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 173 } 174 175 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 176 module_exit(sha2_ce_mod_fini); 177