1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions 4 * 5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <crypto/internal/hash.h> 9 #include <crypto/internal/simd.h> 10 #include <crypto/sha1.h> 11 #include <crypto/sha1_base.h> 12 #include <linux/cpufeature.h> 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 16 #include <asm/hwcap.h> 17 #include <asm/neon.h> 18 #include <asm/simd.h> 19 20 #include "sha1.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 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src, 27 int blocks); 28 29 static int sha1_ce_update(struct shash_desc *desc, const u8 *data, 30 unsigned int len) 31 { 32 struct sha1_state *sctx = shash_desc_ctx(desc); 33 34 if (!crypto_simd_usable() || 35 (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE) 36 return sha1_update_arm(desc, data, len); 37 38 kernel_neon_begin(); 39 sha1_base_do_update(desc, data, len, sha1_ce_transform); 40 kernel_neon_end(); 41 42 return 0; 43 } 44 45 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data, 46 unsigned int len, u8 *out) 47 { 48 if (!crypto_simd_usable()) 49 return sha1_finup_arm(desc, data, len, out); 50 51 kernel_neon_begin(); 52 if (len) 53 sha1_base_do_update(desc, data, len, sha1_ce_transform); 54 sha1_base_do_finalize(desc, sha1_ce_transform); 55 kernel_neon_end(); 56 57 return sha1_base_finish(desc, out); 58 } 59 60 static int sha1_ce_final(struct shash_desc *desc, u8 *out) 61 { 62 return sha1_ce_finup(desc, NULL, 0, out); 63 } 64 65 static struct shash_alg alg = { 66 .init = sha1_base_init, 67 .update = sha1_ce_update, 68 .final = sha1_ce_final, 69 .finup = sha1_ce_finup, 70 .descsize = sizeof(struct sha1_state), 71 .digestsize = SHA1_DIGEST_SIZE, 72 .base = { 73 .cra_name = "sha1", 74 .cra_driver_name = "sha1-ce", 75 .cra_priority = 200, 76 .cra_blocksize = SHA1_BLOCK_SIZE, 77 .cra_module = THIS_MODULE, 78 } 79 }; 80 81 static int __init sha1_ce_mod_init(void) 82 { 83 return crypto_register_shash(&alg); 84 } 85 86 static void __exit sha1_ce_mod_fini(void) 87 { 88 crypto_unregister_shash(&alg); 89 } 90 91 module_cpu_feature_match(SHA1, sha1_ce_mod_init); 92 module_exit(sha1_ce_mod_fini); 93