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/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 #include <asm/hwcap.h> 20 #include <asm/simd.h> 21 #include <asm/neon.h> 22 #include <asm/unaligned.h> 23 24 #include "sha256_glue.h" 25 26 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions"); 27 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 28 MODULE_LICENSE("GPL v2"); 29 30 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src, 31 int blocks); 32 33 static int sha2_ce_update(struct shash_desc *desc, const u8 *data, 34 unsigned int len) 35 { 36 struct sha256_state *sctx = shash_desc_ctx(desc); 37 38 if (!crypto_simd_usable() || 39 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 40 return crypto_sha256_arm_update(desc, data, len); 41 42 kernel_neon_begin(); 43 sha256_base_do_update(desc, data, len, 44 (sha256_block_fn *)sha2_ce_transform); 45 kernel_neon_end(); 46 47 return 0; 48 } 49 50 static int sha2_ce_finup(struct shash_desc *desc, const u8 *data, 51 unsigned int len, u8 *out) 52 { 53 if (!crypto_simd_usable()) 54 return crypto_sha256_arm_finup(desc, data, len, out); 55 56 kernel_neon_begin(); 57 if (len) 58 sha256_base_do_update(desc, data, len, 59 (sha256_block_fn *)sha2_ce_transform); 60 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 61 kernel_neon_end(); 62 63 return sha256_base_finish(desc, out); 64 } 65 66 static int sha2_ce_final(struct shash_desc *desc, u8 *out) 67 { 68 return sha2_ce_finup(desc, NULL, 0, out); 69 } 70 71 static struct shash_alg algs[] = { { 72 .init = sha224_base_init, 73 .update = sha2_ce_update, 74 .final = sha2_ce_final, 75 .finup = sha2_ce_finup, 76 .descsize = sizeof(struct sha256_state), 77 .digestsize = SHA224_DIGEST_SIZE, 78 .base = { 79 .cra_name = "sha224", 80 .cra_driver_name = "sha224-ce", 81 .cra_priority = 300, 82 .cra_blocksize = SHA256_BLOCK_SIZE, 83 .cra_module = THIS_MODULE, 84 } 85 }, { 86 .init = sha256_base_init, 87 .update = sha2_ce_update, 88 .final = sha2_ce_final, 89 .finup = sha2_ce_finup, 90 .descsize = sizeof(struct sha256_state), 91 .digestsize = SHA256_DIGEST_SIZE, 92 .base = { 93 .cra_name = "sha256", 94 .cra_driver_name = "sha256-ce", 95 .cra_priority = 300, 96 .cra_blocksize = SHA256_BLOCK_SIZE, 97 .cra_module = THIS_MODULE, 98 } 99 } }; 100 101 static int __init sha2_ce_mod_init(void) 102 { 103 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 104 } 105 106 static void __exit sha2_ce_mod_fini(void) 107 { 108 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 109 } 110 111 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 112 module_exit(sha2_ce_mod_fini); 113