1 /* 2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions 3 * 4 * Copyright (C) 2015 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 <crypto/internal/hash.h> 12 #include <crypto/sha.h> 13 #include <crypto/sha256_base.h> 14 #include <linux/cpufeature.h> 15 #include <linux/crypto.h> 16 #include <linux/module.h> 17 18 #include <asm/hwcap.h> 19 #include <asm/simd.h> 20 #include <asm/neon.h> 21 #include <asm/unaligned.h> 22 23 #include "sha256_glue.h" 24 25 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 26 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 27 MODULE_LICENSE("GPL v2"); 28 29 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src, 30 int blocks); 31 32 static int sha2_ce_update(struct shash_desc *desc, const u8 *data, 33 unsigned int len) 34 { 35 struct sha256_state *sctx = shash_desc_ctx(desc); 36 37 if (!may_use_simd() || 38 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 39 return crypto_sha256_arm_update(desc, data, len); 40 41 kernel_neon_begin(); 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 sha2_ce_finup(struct shash_desc *desc, const u8 *data, 50 unsigned int len, u8 *out) 51 { 52 if (!may_use_simd()) 53 return crypto_sha256_arm_finup(desc, data, len, out); 54 55 kernel_neon_begin(); 56 if (len) 57 sha256_base_do_update(desc, data, len, 58 (sha256_block_fn *)sha2_ce_transform); 59 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 60 kernel_neon_end(); 61 62 return sha256_base_finish(desc, out); 63 } 64 65 static int sha2_ce_final(struct shash_desc *desc, u8 *out) 66 { 67 return sha2_ce_finup(desc, NULL, 0, out); 68 } 69 70 static struct shash_alg algs[] = { { 71 .init = sha224_base_init, 72 .update = sha2_ce_update, 73 .final = sha2_ce_final, 74 .finup = sha2_ce_finup, 75 .descsize = sizeof(struct sha256_state), 76 .digestsize = SHA224_DIGEST_SIZE, 77 .base = { 78 .cra_name = "sha224", 79 .cra_driver_name = "sha224-ce", 80 .cra_priority = 300, 81 .cra_blocksize = SHA256_BLOCK_SIZE, 82 .cra_module = THIS_MODULE, 83 } 84 }, { 85 .init = sha256_base_init, 86 .update = sha2_ce_update, 87 .final = sha2_ce_final, 88 .finup = sha2_ce_finup, 89 .descsize = sizeof(struct sha256_state), 90 .digestsize = SHA256_DIGEST_SIZE, 91 .base = { 92 .cra_name = "sha256", 93 .cra_driver_name = "sha256-ce", 94 .cra_priority = 300, 95 .cra_blocksize = SHA256_BLOCK_SIZE, 96 .cra_module = THIS_MODULE, 97 } 98 } }; 99 100 static int __init sha2_ce_mod_init(void) 101 { 102 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 103 } 104 105 static void __exit sha2_ce_mod_fini(void) 106 { 107 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 108 } 109 110 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 111 module_exit(sha2_ce_mod_fini); 112