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) 2015 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <crypto/internal/hash.h> 9 #include <crypto/internal/simd.h> 10 #include <crypto/sha2.h> 11 #include <crypto/sha256_base.h> 12 #include <linux/cpufeature.h> 13 #include <linux/crypto.h> 14 #include <linux/module.h> 15 16 #include <asm/hwcap.h> 17 #include <asm/simd.h> 18 #include <asm/neon.h> 19 #include <asm/unaligned.h> 20 21 #include "sha256_glue.h" 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 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src, 28 int blocks); 29 30 static int sha2_ce_update(struct shash_desc *desc, const u8 *data, 31 unsigned int len) 32 { 33 struct sha256_state *sctx = shash_desc_ctx(desc); 34 35 if (!crypto_simd_usable() || 36 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE) 37 return crypto_sha256_arm_update(desc, data, len); 38 39 kernel_neon_begin(); 40 sha256_base_do_update(desc, data, len, 41 (sha256_block_fn *)sha2_ce_transform); 42 kernel_neon_end(); 43 44 return 0; 45 } 46 47 static int sha2_ce_finup(struct shash_desc *desc, const u8 *data, 48 unsigned int len, u8 *out) 49 { 50 if (!crypto_simd_usable()) 51 return crypto_sha256_arm_finup(desc, data, len, out); 52 53 kernel_neon_begin(); 54 if (len) 55 sha256_base_do_update(desc, data, len, 56 (sha256_block_fn *)sha2_ce_transform); 57 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform); 58 kernel_neon_end(); 59 60 return sha256_base_finish(desc, out); 61 } 62 63 static int sha2_ce_final(struct shash_desc *desc, u8 *out) 64 { 65 return sha2_ce_finup(desc, NULL, 0, out); 66 } 67 68 static struct shash_alg algs[] = { { 69 .init = sha224_base_init, 70 .update = sha2_ce_update, 71 .final = sha2_ce_final, 72 .finup = sha2_ce_finup, 73 .descsize = sizeof(struct sha256_state), 74 .digestsize = SHA224_DIGEST_SIZE, 75 .base = { 76 .cra_name = "sha224", 77 .cra_driver_name = "sha224-ce", 78 .cra_priority = 300, 79 .cra_blocksize = SHA256_BLOCK_SIZE, 80 .cra_module = THIS_MODULE, 81 } 82 }, { 83 .init = sha256_base_init, 84 .update = sha2_ce_update, 85 .final = sha2_ce_final, 86 .finup = sha2_ce_finup, 87 .descsize = sizeof(struct sha256_state), 88 .digestsize = SHA256_DIGEST_SIZE, 89 .base = { 90 .cra_name = "sha256", 91 .cra_driver_name = "sha256-ce", 92 .cra_priority = 300, 93 .cra_blocksize = SHA256_BLOCK_SIZE, 94 .cra_module = THIS_MODULE, 95 } 96 } }; 97 98 static int __init sha2_ce_mod_init(void) 99 { 100 return crypto_register_shashes(algs, ARRAY_SIZE(algs)); 101 } 102 103 static void __exit sha2_ce_mod_fini(void) 104 { 105 crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); 106 } 107 108 module_cpu_feature_match(SHA2, sha2_ce_mod_init); 109 module_exit(sha2_ce_mod_fini); 110