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/internal/simd.h> 16 #include <crypto/sha.h> 17 #include <crypto/sha1_base.h> 18 #include <linux/cpufeature.h> 19 #include <linux/crypto.h> 20 #include <linux/module.h> 21 22 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); 23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 24 MODULE_LICENSE("GPL v2"); 25 26 struct sha1_ce_state { 27 struct sha1_state sst; 28 u32 finalize; 29 }; 30 31 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, 32 int blocks); 33 34 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count); 35 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize); 36 37 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 38 unsigned int len) 39 { 40 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 41 42 if (!crypto_simd_usable()) 43 return crypto_sha1_update(desc, data, len); 44 45 sctx->finalize = 0; 46 kernel_neon_begin(); 47 sha1_base_do_update(desc, data, len, 48 (sha1_block_fn *)sha1_ce_transform); 49 kernel_neon_end(); 50 51 return 0; 52 } 53 54 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 55 unsigned int len, u8 *out) 56 { 57 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 58 bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE); 59 60 if (!crypto_simd_usable()) 61 return crypto_sha1_finup(desc, data, len, out); 62 63 /* 64 * Allow the asm code to perform the finalization if there is no 65 * partial data and the input is a round multiple of the block size. 66 */ 67 sctx->finalize = finalize; 68 69 kernel_neon_begin(); 70 sha1_base_do_update(desc, data, len, 71 (sha1_block_fn *)sha1_ce_transform); 72 if (!finalize) 73 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); 74 kernel_neon_end(); 75 return sha1_base_finish(desc, out); 76 } 77 78 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 79 { 80 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 81 82 if (!crypto_simd_usable()) 83 return crypto_sha1_finup(desc, NULL, 0, out); 84 85 sctx->finalize = 0; 86 kernel_neon_begin(); 87 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); 88 kernel_neon_end(); 89 return sha1_base_finish(desc, out); 90 } 91 92 static struct shash_alg alg = { 93 .init = sha1_base_init, 94 .update = sha1_ce_update, 95 .final = sha1_ce_final, 96 .finup = sha1_ce_finup, 97 .descsize = sizeof(struct sha1_ce_state), 98 .digestsize = SHA1_DIGEST_SIZE, 99 .base = { 100 .cra_name = "sha1", 101 .cra_driver_name = "sha1-ce", 102 .cra_priority = 200, 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