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 #define ASM_EXPORT(sym, val) \ 21 asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val)); 22 23 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 25 MODULE_LICENSE("GPL v2"); 26 27 struct sha256_ce_state { 28 struct sha256_state sst; 29 u32 finalize; 30 }; 31 32 asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src, 33 int blocks); 34 35 static int sha256_ce_update(struct shash_desc *desc, const u8 *data, 36 unsigned int len) 37 { 38 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 39 40 sctx->finalize = 0; 41 kernel_neon_begin_partial(28); 42 sha256_base_do_update(desc, data, len, 43 (sha256_block_fn *)sha2_ce_transform); 44 kernel_neon_end(); 45 46 return 0; 47 } 48 49 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data, 50 unsigned int len, u8 *out) 51 { 52 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 53 bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE); 54 55 ASM_EXPORT(sha256_ce_offsetof_count, 56 offsetof(struct sha256_ce_state, sst.count)); 57 ASM_EXPORT(sha256_ce_offsetof_finalize, 58 offsetof(struct sha256_ce_state, finalize)); 59 60 /* 61 * Allow the asm code to perform the finalization if there is no 62 * partial data and the input is a round multiple of the block size. 63 */ 64 sctx->finalize = finalize; 65 66 kernel_neon_begin_partial(28); 67 sha256_base_do_update(desc, data, len, 68 (sha256_block_fn *)sha2_ce_transform); 69 if (!finalize) 70 sha256_base_do_finalize(desc, 71 (sha256_block_fn *)sha2_ce_transform); 72 kernel_neon_end(); 73 return sha256_base_finish(desc, out); 74 } 75 76 static int sha256_ce_final(struct shash_desc *desc, u8 *out) 77 { 78 struct sha256_ce_state *sctx = shash_desc_ctx(desc); 79 80 sctx->finalize = 0; 81 kernel_neon_begin_partial(28); 82 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 83 kernel_neon_end(); 84 return sha256_base_finish(desc, out); 85 } 86 87 static struct shash_alg algs[] = { { 88 .init = sha224_base_init, 89 .update = sha256_ce_update, 90 .final = sha256_ce_final, 91 .finup = sha256_ce_finup, 92 .descsize = sizeof(struct sha256_ce_state), 93 .digestsize = SHA224_DIGEST_SIZE, 94 .base = { 95 .cra_name = "sha224", 96 .cra_driver_name = "sha224-ce", 97 .cra_priority = 200, 98 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 99 .cra_blocksize = SHA256_BLOCK_SIZE, 100 .cra_module = THIS_MODULE, 101 } 102 }, { 103 .init = sha256_base_init, 104 .update = sha256_ce_update, 105 .final = sha256_ce_final, 106 .finup = sha256_ce_finup, 107 .descsize = sizeof(struct sha256_ce_state), 108 .digestsize = SHA256_DIGEST_SIZE, 109 .base = { 110 .cra_name = "sha256", 111 .cra_driver_name = "sha256-ce", 112 .cra_priority = 200, 113 .cra_flags = CRYPTO_ALG_TYPE_SHASH, 114 .cra_blocksize = SHA256_BLOCK_SIZE, 115 .cra_module = THIS_MODULE, 116 } 117 } }; 118 119 static int __init sha2_ce_mod_init(void) 120 { 121 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 122 } 123 124 static void __exit sha2_ce_mod_fini(void) 125 { 126 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 127 } 128 129 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 130 module_exit(sha2_ce_mod_fini); 131