1 /* 2 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions 3 * 4 * Copyright (C) 2015 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 <crypto/internal/hash.h> 12 #include <crypto/sha.h> 13 #include <crypto/sha1_base.h> 14 #include <linux/cpufeature.h> 15 #include <linux/crypto.h> 16 #include <linux/module.h> 17 18 #include <asm/hwcap.h> 19 #include <asm/neon.h> 20 #include <asm/simd.h> 21 22 #include "sha1.h" 23 24 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions"); 25 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 26 MODULE_LICENSE("GPL v2"); 27 28 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src, 29 int blocks); 30 31 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 32 unsigned int len) 33 { 34 struct sha1_state *sctx = shash_desc_ctx(desc); 35 36 if (!may_use_simd() || 37 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 38 return sha1_update_arm(desc, data, len); 39 40 kernel_neon_begin(); 41 sha1_base_do_update(desc, data, len, sha1_ce_transform); 42 kernel_neon_end(); 43 44 return 0; 45 } 46 47 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 48 unsigned int len, u8 *out) 49 { 50 if (!may_use_simd()) 51 return sha1_finup_arm(desc, data, len, out); 52 53 kernel_neon_begin(); 54 if (len) 55 sha1_base_do_update(desc, data, len, sha1_ce_transform); 56 sha1_base_do_finalize(desc, sha1_ce_transform); 57 kernel_neon_end(); 58 59 return sha1_base_finish(desc, out); 60 } 61 62 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 63 { 64 return sha1_ce_finup(desc, NULL, 0, out); 65 } 66 67 static struct shash_alg alg = { 68 .init = sha1_base_init, 69 .update = sha1_ce_update, 70 .final = sha1_ce_final, 71 .finup = sha1_ce_finup, 72 .descsize = sizeof(struct sha1_state), 73 .digestsize = SHA1_DIGEST_SIZE, 74 .base = { 75 .cra_name = "sha1", 76 .cra_driver_name = "sha1-ce", 77 .cra_priority = 200, 78 .cra_blocksize = SHA1_BLOCK_SIZE, 79 .cra_module = THIS_MODULE, 80 } 81 }; 82 83 static int __init sha1_ce_mod_init(void) 84 { 85 return crypto_register_shash(&alg); 86 } 87 88 static void __exit sha1_ce_mod_fini(void) 89 { 90 crypto_unregister_shash(&alg); 91 } 92 93 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 94 module_exit(sha1_ce_mod_fini); 95