1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Crypto API wrapper for the generic SHA256 code from lib/crypto/sha256.c 4 * 5 * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> 6 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 7 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 8 * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com> 9 */ 10 #include <crypto/internal/hash.h> 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/mm.h> 14 #include <linux/types.h> 15 #include <crypto/sha2.h> 16 #include <crypto/sha256_base.h> 17 #include <asm/byteorder.h> 18 #include <asm/unaligned.h> 19 20 const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = { 21 0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47, 22 0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2, 23 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4, 24 0x2f 25 }; 26 EXPORT_SYMBOL_GPL(sha224_zero_message_hash); 27 28 const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = { 29 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 30 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 31 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 32 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55 33 }; 34 EXPORT_SYMBOL_GPL(sha256_zero_message_hash); 35 36 int crypto_sha256_update(struct shash_desc *desc, const u8 *data, 37 unsigned int len) 38 { 39 sha256_update(shash_desc_ctx(desc), data, len); 40 return 0; 41 } 42 EXPORT_SYMBOL(crypto_sha256_update); 43 44 static int crypto_sha256_final(struct shash_desc *desc, u8 *out) 45 { 46 if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE) 47 sha224_final(shash_desc_ctx(desc), out); 48 else 49 sha256_final(shash_desc_ctx(desc), out); 50 return 0; 51 } 52 53 int crypto_sha256_finup(struct shash_desc *desc, const u8 *data, 54 unsigned int len, u8 *hash) 55 { 56 sha256_update(shash_desc_ctx(desc), data, len); 57 return crypto_sha256_final(desc, hash); 58 } 59 EXPORT_SYMBOL(crypto_sha256_finup); 60 61 static struct shash_alg sha256_algs[2] = { { 62 .digestsize = SHA256_DIGEST_SIZE, 63 .init = sha256_base_init, 64 .update = crypto_sha256_update, 65 .final = crypto_sha256_final, 66 .finup = crypto_sha256_finup, 67 .descsize = sizeof(struct sha256_state), 68 .base = { 69 .cra_name = "sha256", 70 .cra_driver_name= "sha256-generic", 71 .cra_priority = 100, 72 .cra_blocksize = SHA256_BLOCK_SIZE, 73 .cra_module = THIS_MODULE, 74 } 75 }, { 76 .digestsize = SHA224_DIGEST_SIZE, 77 .init = sha224_base_init, 78 .update = crypto_sha256_update, 79 .final = crypto_sha256_final, 80 .finup = crypto_sha256_finup, 81 .descsize = sizeof(struct sha256_state), 82 .base = { 83 .cra_name = "sha224", 84 .cra_driver_name= "sha224-generic", 85 .cra_priority = 100, 86 .cra_blocksize = SHA224_BLOCK_SIZE, 87 .cra_module = THIS_MODULE, 88 } 89 } }; 90 91 static int __init sha256_generic_mod_init(void) 92 { 93 return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs)); 94 } 95 96 static void __exit sha256_generic_mod_fini(void) 97 { 98 crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs)); 99 } 100 101 subsys_initcall(sha256_generic_mod_init); 102 module_exit(sha256_generic_mod_fini); 103 104 MODULE_LICENSE("GPL"); 105 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm"); 106 107 MODULE_ALIAS_CRYPTO("sha224"); 108 MODULE_ALIAS_CRYPTO("sha224-generic"); 109 MODULE_ALIAS_CRYPTO("sha256"); 110 MODULE_ALIAS_CRYPTO("sha256-generic"); 111