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