1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sha1-ce-glue.c - SHA-1 secure hash 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/sha1.h> 14 #include <crypto/sha1_base.h> 15 #include <linux/cpufeature.h> 16 #include <linux/crypto.h> 17 #include <linux/module.h> 18 19 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); 20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 21 MODULE_LICENSE("GPL v2"); 22 MODULE_ALIAS_CRYPTO("sha1"); 23 24 struct sha1_ce_state { 25 struct sha1_state sst; 26 u32 finalize; 27 }; 28 29 extern const u32 sha1_ce_offsetof_count; 30 extern const u32 sha1_ce_offsetof_finalize; 31 32 asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, 33 int blocks); 34 35 static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src, 36 int blocks) 37 { 38 while (blocks) { 39 int rem; 40 41 kernel_neon_begin(); 42 rem = sha1_ce_transform(container_of(sst, struct sha1_ce_state, 43 sst), src, blocks); 44 kernel_neon_end(); 45 src += (blocks - rem) * SHA1_BLOCK_SIZE; 46 blocks = rem; 47 } 48 } 49 50 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); 51 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); 52 53 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 54 unsigned int len) 55 { 56 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 57 58 if (!crypto_simd_usable()) 59 return crypto_sha1_update(desc, data, len); 60 61 sctx->finalize = 0; 62 sha1_base_do_update(desc, data, len, __sha1_ce_transform); 63 64 return 0; 65 } 66 67 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 68 unsigned int len, u8 *out) 69 { 70 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 71 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; 72 73 if (!crypto_simd_usable()) 74 return crypto_sha1_finup(desc, data, len, out); 75 76 /* 77 * Allow the asm code to perform the finalization if there is no 78 * partial data and the input is a round multiple of the block size. 79 */ 80 sctx->finalize = finalize; 81 82 sha1_base_do_update(desc, data, len, __sha1_ce_transform); 83 if (!finalize) 84 sha1_base_do_finalize(desc, __sha1_ce_transform); 85 return sha1_base_finish(desc, out); 86 } 87 88 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 89 { 90 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 91 92 if (!crypto_simd_usable()) 93 return crypto_sha1_finup(desc, NULL, 0, out); 94 95 sctx->finalize = 0; 96 sha1_base_do_finalize(desc, __sha1_ce_transform); 97 return sha1_base_finish(desc, out); 98 } 99 100 static int sha1_ce_export(struct shash_desc *desc, void *out) 101 { 102 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 103 104 memcpy(out, &sctx->sst, sizeof(struct sha1_state)); 105 return 0; 106 } 107 108 static int sha1_ce_import(struct shash_desc *desc, const void *in) 109 { 110 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 111 112 memcpy(&sctx->sst, in, sizeof(struct sha1_state)); 113 sctx->finalize = 0; 114 return 0; 115 } 116 117 static struct shash_alg alg = { 118 .init = sha1_base_init, 119 .update = sha1_ce_update, 120 .final = sha1_ce_final, 121 .finup = sha1_ce_finup, 122 .import = sha1_ce_import, 123 .export = sha1_ce_export, 124 .descsize = sizeof(struct sha1_ce_state), 125 .statesize = sizeof(struct sha1_state), 126 .digestsize = SHA1_DIGEST_SIZE, 127 .base = { 128 .cra_name = "sha1", 129 .cra_driver_name = "sha1-ce", 130 .cra_priority = 200, 131 .cra_blocksize = SHA1_BLOCK_SIZE, 132 .cra_module = THIS_MODULE, 133 } 134 }; 135 136 static int __init sha1_ce_mod_init(void) 137 { 138 return crypto_register_shash(&alg); 139 } 140 141 static void __exit sha1_ce_mod_fini(void) 142 { 143 crypto_unregister_shash(&alg); 144 } 145 146 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 147 module_exit(sha1_ce_mod_fini); 148