1 /* 2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions 3 * 4 * Copyright (C) 2014 - 2017 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/simd.h> 13 #include <asm/unaligned.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/sha.h> 16 #include <crypto/sha256_base.h> 17 #include <linux/cpufeature.h> 18 #include <linux/crypto.h> 19 #include <linux/module.h> 20 21 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 23 MODULE_LICENSE("GPL v2"); 24 25 struct sha256_ce_state { 26 struct sha256_state sst; 27 u32 finalize; 28 }; 29 30 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, 31 int blocks); 32 33 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 34 sst.count); 35 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 36 finalize); 37 38 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 39 40 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 41 unsigned int len) 42 { 43 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 44 45 if (!may_use_simd()) 46 return sha256_base_do_update(desc, data, len, 47 (sha256_block_fn *)sha256_block_data_order); 48 49 sctx->finalize = 0; 50 kernel_neon_begin(); 51 sha256_base_do_update(desc, data, len, 52 (sha256_block_fn *)sha2_ce_transform); 53 kernel_neon_end(); 54 55 return 0; 56 } 57 58 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 59 unsigned int len, u8 *out) 60 { 61 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 62 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE); 63 64 if (!may_use_simd()) { 65 if (len) 66 sha256_base_do_update(desc, data, len, 67 (sha256_block_fn *)sha256_block_data_order); 68 sha256_base_do_finalize(desc, 69 (sha256_block_fn *)sha256_block_data_order); 70 return sha256_base_finish(desc, out); 71 } 72 73 /* 74 * Allow the asm code to perform the finalization if there is no 75 * partial data and the input is a round multiple of the block size. 76 */ 77 sctx->finalize = finalize; 78 79 kernel_neon_begin(); 80 sha256_base_do_update(desc, data, len, 81 (sha256_block_fn *)sha2_ce_transform); 82 if (!finalize) 83 sha256_base_do_finalize(desc, 84 (sha256_block_fn *)sha2_ce_transform); 85 kernel_neon_end(); 86 return sha256_base_finish(desc, out); 87 } 88 89 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 90 { 91 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 92 93 if (!may_use_simd()) { 94 sha256_base_do_finalize(desc, 95 (sha256_block_fn *)sha256_block_data_order); 96 return sha256_base_finish(desc, out); 97 } 98 99 sctx->finalize = 0; 100 kernel_neon_begin(); 101 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 102 kernel_neon_end(); 103 return sha256_base_finish(desc, out); 104 } 105 106 static struct shash_alg algs[] = { { 107 .init = sha224_base_init, 108 .update = sha256_ce_update, 109 .final = sha256_ce_final, 110 .finup = sha256_ce_finup, 111 .descsize = sizeof(struct sha256_ce_state), 112 .digestsize = SHA224_DIGEST_SIZE, 113 .base = { 114 .cra_name = "sha224", 115 .cra_driver_name = "sha224-ce", 116 .cra_priority = 200, 117 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 118 .cra_blocksize = SHA256_BLOCK_SIZE, 119 .cra_module = THIS_MODULE, 120 } 121 }, { 122 .init = sha256_base_init, 123 .update = sha256_ce_update, 124 .final = sha256_ce_final, 125 .finup = sha256_ce_finup, 126 .descsize = sizeof(struct sha256_ce_state), 127 .digestsize = SHA256_DIGEST_SIZE, 128 .base = { 129 .cra_name = "sha256", 130 .cra_driver_name = "sha256-ce", 131 .cra_priority = 200, 132 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 133 .cra_blocksize = SHA256_BLOCK_SIZE, 134 .cra_module = THIS_MODULE, 135 } 136 } }; 137 138 static int __init sha2_ce_mod_init(void) 139 { 140 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 141 } 142 143 static void __exit sha2_ce_mod_fini(void) 144 { 145 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 146 } 147 148 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 149 module_exit(sha2_ce_mod_fini); 150