1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions 4 * 5 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <asm/neon.h> 9 #include <asm/simd.h> 10 #include <asm/unaligned.h> 11 #include <crypto/internal/hash.h> 12 #include <crypto/internal/simd.h> 13 #include <crypto/sha.h> 14 #include <crypto/sha256_base.h> 15 #include <linux/cpufeature.h> 16 #include <linux/crypto.h> 17 #include <linux/module.h> 18 19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 21 MODULE_LICENSE("GPL v2"); 22 23 struct sha256_ce_state { 24 struct sha256_state sst; 25 u32 finalize; 26 }; 27 28 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, 29 int blocks); 30 31 static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src, 32 int blocks) 33 { 34 sha2_ce_transform(container_of(sst, struct sha256_ce_state, sst), src, 35 blocks); 36 } 37 38 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 39 sst.count); 40 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 41 finalize); 42 43 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 44 45 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src, 46 int blocks) 47 { 48 sha256_block_data_order(sst->state, src, blocks); 49 } 50 51 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 52 unsigned int len) 53 { 54 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 55 56 if (!crypto_simd_usable()) 57 return sha256_base_do_update(desc, data, len, 58 __sha256_block_data_order); 59 60 sctx->finalize = 0; 61 kernel_neon_begin(); 62 sha256_base_do_update(desc, data, len, __sha2_ce_transform); 63 kernel_neon_end(); 64 65 return 0; 66 } 67 68 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 69 unsigned int len, u8 *out) 70 { 71 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 72 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len; 73 74 if (!crypto_simd_usable()) { 75 if (len) 76 sha256_base_do_update(desc, data, len, 77 __sha256_block_data_order); 78 sha256_base_do_finalize(desc, __sha256_block_data_order); 79 return sha256_base_finish(desc, out); 80 } 81 82 /* 83 * Allow the asm code to perform the finalization if there is no 84 * partial data and the input is a round multiple of the block size. 85 */ 86 sctx->finalize = finalize; 87 88 kernel_neon_begin(); 89 sha256_base_do_update(desc, data, len, __sha2_ce_transform); 90 if (!finalize) 91 sha256_base_do_finalize(desc, __sha2_ce_transform); 92 kernel_neon_end(); 93 return sha256_base_finish(desc, out); 94 } 95 96 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 97 { 98 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 99 100 if (!crypto_simd_usable()) { 101 sha256_base_do_finalize(desc, __sha256_block_data_order); 102 return sha256_base_finish(desc, out); 103 } 104 105 sctx->finalize = 0; 106 kernel_neon_begin(); 107 sha256_base_do_finalize(desc, __sha2_ce_transform); 108 kernel_neon_end(); 109 return sha256_base_finish(desc, out); 110 } 111 112 static struct shash_alg algs[] = { { 113 .init = sha224_base_init, 114 .update = sha256_ce_update, 115 .final = sha256_ce_final, 116 .finup = sha256_ce_finup, 117 .descsize = sizeof(struct sha256_ce_state), 118 .digestsize = SHA224_DIGEST_SIZE, 119 .base = { 120 .cra_name = "sha224", 121 .cra_driver_name = "sha224-ce", 122 .cra_priority = 200, 123 .cra_blocksize = SHA256_BLOCK_SIZE, 124 .cra_module = THIS_MODULE, 125 } 126 }, { 127 .init = sha256_base_init, 128 .update = sha256_ce_update, 129 .final = sha256_ce_final, 130 .finup = sha256_ce_finup, 131 .descsize = sizeof(struct sha256_ce_state), 132 .digestsize = SHA256_DIGEST_SIZE, 133 .base = { 134 .cra_name = "sha256", 135 .cra_driver_name = "sha256-ce", 136 .cra_priority = 200, 137 .cra_blocksize = SHA256_BLOCK_SIZE, 138 .cra_module = THIS_MODULE, 139 } 140 } }; 141 142 static int __init sha2_ce_mod_init(void) 143 { 144 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 145 } 146 147 static void __exit sha2_ce_mod_fini(void) 148 { 149 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 150 } 151 152 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 153 module_exit(sha2_ce_mod_fini); 154