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 #define ASM_EXPORT(sym, val) \ 21 asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val)); 22 23 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); 24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 25 MODULE_LICENSE("GPL v2"); 26 27 struct sha1_ce_state { 28 struct sha1_state sst; 29 u32 finalize; 30 }; 31 32 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src, 33 int blocks); 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 ASM_EXPORT(sha1_ce_offsetof_count, 56 offsetof(struct sha1_ce_state, sst.count)); 57 ASM_EXPORT(sha1_ce_offsetof_finalize, 58 offsetof(struct sha1_ce_state, finalize)); 59 60 /* 61 * Allow the asm code to perform the finalization if there is no 62 * partial data and the input is a round multiple of the block size. 63 */ 64 sctx->finalize = finalize; 65 66 kernel_neon_begin_partial(16); 67 sha1_base_do_update(desc, data, len, 68 (sha1_block_fn *)sha1_ce_transform); 69 if (!finalize) 70 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); 71 kernel_neon_end(); 72 return sha1_base_finish(desc, out); 73 } 74 75 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 76 { 77 struct sha1_ce_state *sctx = shash_desc_ctx(desc); 78 79 sctx->finalize = 0; 80 kernel_neon_begin_partial(16); 81 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform); 82 kernel_neon_end(); 83 return sha1_base_finish(desc, out); 84 } 85 86 static struct shash_alg alg = { 87 .init = sha1_base_init, 88 .update = sha1_ce_update, 89 .final = sha1_ce_final, 90 .finup = sha1_ce_finup, 91 .descsize = sizeof(struct sha1_ce_state), 92 .digestsize = SHA1_DIGEST_SIZE, 93 .base = { 94 .cra_name = "sha1", 95 .cra_driver_name = "sha1-ce", 96 .cra_priority = 200, 97 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 98 .cra_blocksize = SHA1_BLOCK_SIZE, 99 .cra_module = THIS_MODULE, 100 } 101 }; 102 103 static int __init sha1_ce_mod_init(void) 104 { 105 return crypto_register_shash(&alg); 106 } 107 108 static void __exit sha1_ce_mod_fini(void) 109 { 110 crypto_unregister_shash(&alg); 111 } 112 113 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 114 module_exit(sha1_ce_mod_fini); 115