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