1 /* 2 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions 3 * 4 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <asm/neon.h> 12 #include <asm/simd.h> 13 #include <asm/unaligned.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/sha.h> 16 #include <crypto/sha1_base.h> 17 #include <linux/cpufeature.h> 18 #include <linux/crypto.h> 19 #include <linux/module.h> 20 21 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); 22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 23 MODULE_LICENSE("GPL v2"); 24 25 struct sha1_ce_state { 26 struct sha1_state sst; 27 u32 finalize; 28 }; 29 30 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, 31 int blocks); 32 33 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); 34 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); 35 36 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 37 unsigned int len) 38 { 39 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 40 41 if (!may_use_simd()) 42 return crypto_sha1_update(desc, data, len); 43 44 sctx->finalize = 0; 45 kernel_neon_begin(); 46 sha1_base_do_update(desc, data, len, 47 (sha1_block_fn *)sha1_ce_transform); 48 kernel_neon_end(); 49 50 return 0; 51 } 52 53 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 54 unsigned int len, u8 *out) 55 { 56 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 57 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE); 58 59 if (!may_use_simd()) 60 return crypto_sha1_finup(desc, data, len, out); 61 62 /* 63 * Allow the asm code to perform the finalization if there is no 64 * partial data and the input is a round multiple of the block size. 65 */ 66 sctx->finalize = finalize; 67 68 kernel_neon_begin(); 69 sha1_base_do_update(desc, data, len, 70 (sha1_block_fn *)sha1_ce_transform); 71 if (!finalize) 72 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); 73 kernel_neon_end(); 74 return sha1_base_finish(desc, out); 75 } 76 77 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 78 { 79 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 80 81 if (!may_use_simd()) 82 return crypto_sha1_finup(desc, NULL, 0, out); 83 84 sctx->finalize = 0; 85 kernel_neon_begin(); 86 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); 87 kernel_neon_end(); 88 return sha1_base_finish(desc, out); 89 } 90 91 static struct shash_alg alg = { 92 .init = sha1_base_init, 93 .update = sha1_ce_update, 94 .final = sha1_ce_final, 95 .finup = sha1_ce_finup, 96 .descsize = sizeof(struct sha1_ce_state), 97 .digestsize = SHA1_DIGEST_SIZE, 98 .base = { 99 .cra_name = "sha1", 100 .cra_driver_name = "sha1-ce", 101 .cra_priority = 200, 102 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 103 .cra_blocksize = SHA1_BLOCK_SIZE, 104 .cra_module = THIS_MODULE, 105 } 106 }; 107 108 static int __init sha1_ce_mod_init(void) 109 { 110 return crypto_register_shash(&alg); 111 } 112 113 static void __exit sha1_ce_mod_fini(void) 114 { 115 crypto_unregister_shash(&alg); 116 } 117 118 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 119 module_exit(sha1_ce_mod_fini); 120