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/crypto.h> 15 #include <linux/module.h> 16 17 #include <asm/hwcap.h> 18 #include <asm/neon.h> 19 #include <asm/simd.h> 20 21 #include "sha1.h" 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 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src, 28 int blocks); 29 30 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 31 unsigned int len) 32 { 33 struct sha1_state *sctx = shash_desc_ctx(desc); 34 35 if (!may_use_simd() || 36 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 37 return sha1_update_arm(desc, data, len); 38 39 kernel_neon_begin(); 40 sha1_base_do_update(desc, data, len, sha1_ce_transform); 41 kernel_neon_end(); 42 43 return 0; 44 } 45 46 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 47 unsigned int len, u8 *out) 48 { 49 if (!may_use_simd()) 50 return sha1_finup_arm(desc, data, len, out); 51 52 kernel_neon_begin(); 53 if (len) 54 sha1_base_do_update(desc, data, len, sha1_ce_transform); 55 sha1_base_do_finalize(desc, sha1_ce_transform); 56 kernel_neon_end(); 57 58 return sha1_base_finish(desc, out); 59 } 60 61 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 62 { 63 return sha1_ce_finup(desc, NULL, 0, out); 64 } 65 66 static struct shash_alg alg = { 67 .init = sha1_base_init, 68 .update = sha1_ce_update, 69 .final = sha1_ce_final, 70 .finup = sha1_ce_finup, 71 .descsize = sizeof(struct sha1_state), 72 .digestsize = SHA1_DIGEST_SIZE, 73 .base = { 74 .cra_name = "sha1", 75 .cra_driver_name = "sha1-ce", 76 .cra_priority = 200, 77 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 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 if (!(elf_hwcap2 & HWCAP2_SHA1)) 86 return -ENODEV; 87 return crypto_register_shash(&alg); 88 } 89 90 static void __exit sha1_ce_mod_fini(void) 91 { 92 crypto_unregister_shash(&alg); 93 } 94 95 module_init(sha1_ce_mod_init); 96 module_exit(sha1_ce_mod_fini); 97