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 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state, 32 sst.count); 33 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state, 34 finalize); 35 36 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks); 37 38 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 39 unsigned int len) 40 { 41 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 42 43 if (!crypto_simd_usable()) 44 return sha256_base_do_update(desc, data, len, 45 (sha256_block_fn *)sha256_block_data_order); 46 47 sctx->finalize = 0; 48 kernel_neon_begin(); 49 sha256_base_do_update(desc, data, len, 50 (sha256_block_fn *)sha2_ce_transform); 51 kernel_neon_end(); 52 53 return 0; 54 } 55 56 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 57 unsigned int len, u8 *out) 58 { 59 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 60 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len; 61 62 if (!crypto_simd_usable()) { 63 if (len) 64 sha256_base_do_update(desc, data, len, 65 (sha256_block_fn *)sha256_block_data_order); 66 sha256_base_do_finalize(desc, 67 (sha256_block_fn *)sha256_block_data_order); 68 return sha256_base_finish(desc, out); 69 } 70 71 /* 72 * Allow the asm code to perform the finalization if there is no 73 * partial data and the input is a round multiple of the block size. 74 */ 75 sctx->finalize = finalize; 76 77 kernel_neon_begin(); 78 sha256_base_do_update(desc, data, len, 79 (sha256_block_fn *)sha2_ce_transform); 80 if (!finalize) 81 sha256_base_do_finalize(desc, 82 (sha256_block_fn *)sha2_ce_transform); 83 kernel_neon_end(); 84 return sha256_base_finish(desc, out); 85 } 86 87 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 88 { 89 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 90 91 if (!crypto_simd_usable()) { 92 sha256_base_do_finalize(desc, 93 (sha256_block_fn *)sha256_block_data_order); 94 return sha256_base_finish(desc, out); 95 } 96 97 sctx->finalize = 0; 98 kernel_neon_begin(); 99 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 100 kernel_neon_end(); 101 return sha256_base_finish(desc, out); 102 } 103 104 static struct shash_alg algs[] = { { 105 .init = sha224_base_init, 106 .update = sha256_ce_update, 107 .final = sha256_ce_final, 108 .finup = sha256_ce_finup, 109 .descsize = sizeof(struct sha256_ce_state), 110 .digestsize = SHA224_DIGEST_SIZE, 111 .base = { 112 .cra_name = "sha224", 113 .cra_driver_name = "sha224-ce", 114 .cra_priority = 200, 115 .cra_blocksize = SHA256_BLOCK_SIZE, 116 .cra_module = THIS_MODULE, 117 } 118 }, { 119 .init = sha256_base_init, 120 .update = sha256_ce_update, 121 .final = sha256_ce_final, 122 .finup = sha256_ce_finup, 123 .descsize = sizeof(struct sha256_ce_state), 124 .digestsize = SHA256_DIGEST_SIZE, 125 .base = { 126 .cra_name = "sha256", 127 .cra_driver_name = "sha256-ce", 128 .cra_priority = 200, 129 .cra_blocksize = SHA256_BLOCK_SIZE, 130 .cra_module = THIS_MODULE, 131 } 132 } }; 133 134 static int __init sha2_ce_mod_init(void) 135 { 136 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 137 } 138 139 static void __exit sha2_ce_mod_fini(void) 140 { 141 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 142 } 143 144 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 145 module_exit(sha2_ce_mod_fini); 146