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 void 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 sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src, 39 blocks); 40 } 41 42 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); 43 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); 44 45 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 46 unsigned int len) 47 { 48 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 49 50 if (!crypto_simd_usable()) 51 return crypto_sha1_update(desc, data, len); 52 53 sctx->finalize = 0; 54 kernel_neon_begin(); 55 sha1_base_do_update(desc, data, len, __sha1_ce_transform); 56 kernel_neon_end(); 57 58 return 0; 59 } 60 61 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 62 unsigned int len, u8 *out) 63 { 64 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 65 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; 66 67 if (!crypto_simd_usable()) 68 return crypto_sha1_finup(desc, data, len, out); 69 70 /* 71 * Allow the asm code to perform the finalization if there is no 72 * partial data and the input is a round multiple of the block size. 73 */ 74 sctx->finalize = finalize; 75 76 kernel_neon_begin(); 77 sha1_base_do_update(desc, data, len, __sha1_ce_transform); 78 if (!finalize) 79 sha1_base_do_finalize(desc, __sha1_ce_transform); 80 kernel_neon_end(); 81 return sha1_base_finish(desc, out); 82 } 83 84 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 85 { 86 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 87 88 if (!crypto_simd_usable()) 89 return crypto_sha1_finup(desc, NULL, 0, out); 90 91 sctx->finalize = 0; 92 kernel_neon_begin(); 93 sha1_base_do_finalize(desc, __sha1_ce_transform); 94 kernel_neon_end(); 95 return sha1_base_finish(desc, out); 96 } 97 98 static int sha1_ce_export(struct shash_desc *desc, void *out) 99 { 100 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 101 102 memcpy(out, &sctx->sst, sizeof(struct sha1_state)); 103 return 0; 104 } 105 106 static int sha1_ce_import(struct shash_desc *desc, const void *in) 107 { 108 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 109 110 memcpy(&sctx->sst, in, sizeof(struct sha1_state)); 111 sctx->finalize = 0; 112 return 0; 113 } 114 115 static struct shash_alg alg = { 116 .init = sha1_base_init, 117 .update = sha1_ce_update, 118 .final = sha1_ce_final, 119 .finup = sha1_ce_finup, 120 .import = sha1_ce_import, 121 .export = sha1_ce_export, 122 .descsize = sizeof(struct sha1_ce_state), 123 .statesize = sizeof(struct sha1_state), 124 .digestsize = SHA1_DIGEST_SIZE, 125 .base = { 126 .cra_name = "sha1", 127 .cra_driver_name = "sha1-ce", 128 .cra_priority = 200, 129 .cra_blocksize = SHA1_BLOCK_SIZE, 130 .cra_module = THIS_MODULE, 131 } 132 }; 133 134 static int __init sha1_ce_mod_init(void) 135 { 136 return crypto_register_shash(&alg); 137 } 138 139 static void __exit sha1_ce_mod_fini(void) 140 { 141 crypto_unregister_shash(&alg); 142 } 143 144 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 145 module_exit(sha1_ce_mod_fini); 146