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/sha.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 23 struct sha1_ce_state { 24 struct sha1_state sst; 25 u32 finalize; 26 }; 27 28 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, 29 int blocks); 30 31 static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src, 32 int blocks) 33 { 34 sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src, 35 blocks); 36 } 37 38 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); 39 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); 40 41 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 42 unsigned int len) 43 { 44 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 45 46 if (!crypto_simd_usable()) 47 return crypto_sha1_update(desc, data, len); 48 49 sctx->finalize = 0; 50 kernel_neon_begin(); 51 sha1_base_do_update(desc, data, len, __sha1_ce_transform); 52 kernel_neon_end(); 53 54 return 0; 55 } 56 57 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 58 unsigned int len, u8 *out) 59 { 60 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 61 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len; 62 63 if (!crypto_simd_usable()) 64 return crypto_sha1_finup(desc, data, len, out); 65 66 /* 67 * Allow the asm code to perform the finalization if there is no 68 * partial data and the input is a round multiple of the block size. 69 */ 70 sctx->finalize = finalize; 71 72 kernel_neon_begin(); 73 sha1_base_do_update(desc, data, len, __sha1_ce_transform); 74 if (!finalize) 75 sha1_base_do_finalize(desc, __sha1_ce_transform); 76 kernel_neon_end(); 77 return sha1_base_finish(desc, out); 78 } 79 80 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 81 { 82 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 83 84 if (!crypto_simd_usable()) 85 return crypto_sha1_finup(desc, NULL, 0, out); 86 87 sctx->finalize = 0; 88 kernel_neon_begin(); 89 sha1_base_do_finalize(desc, __sha1_ce_transform); 90 kernel_neon_end(); 91 return sha1_base_finish(desc, out); 92 } 93 94 static int sha1_ce_export(struct shash_desc *desc, void *out) 95 { 96 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 97 98 memcpy(out, &sctx->sst, sizeof(struct sha1_state)); 99 return 0; 100 } 101 102 static int sha1_ce_import(struct shash_desc *desc, const void *in) 103 { 104 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 105 106 memcpy(&sctx->sst, in, sizeof(struct sha1_state)); 107 sctx->finalize = 0; 108 return 0; 109 } 110 111 static struct shash_alg alg = { 112 .init = sha1_base_init, 113 .update = sha1_ce_update, 114 .final = sha1_ce_final, 115 .finup = sha1_ce_finup, 116 .import = sha1_ce_import, 117 .export = sha1_ce_export, 118 .descsize = sizeof(struct sha1_ce_state), 119 .statesize = sizeof(struct sha1_state), 120 .digestsize = SHA1_DIGEST_SIZE, 121 .base = { 122 .cra_name = "sha1", 123 .cra_driver_name = "sha1-ce", 124 .cra_priority = 200, 125 .cra_blocksize = SHA1_BLOCK_SIZE, 126 .cra_module = THIS_MODULE, 127 } 128 }; 129 130 static int __init sha1_ce_mod_init(void) 131 { 132 return crypto_register_shash(&alg); 133 } 134 135 static void __exit sha1_ce_mod_fini(void) 136 { 137 crypto_unregister_shash(&alg); 138 } 139 140 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 141 module_exit(sha1_ce_mod_fini); 142