1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Cryptographic API. 4 * 5 * SHA1 Secure Hash Algorithm. 6 * 7 * Derived from cryptoapi implementation, adapted for in-place 8 * scatterlist interface. 9 * 10 * Copyright (c) Alan Smithee. 11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> 12 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org> 13 */ 14 #include <crypto/internal/hash.h> 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/mm.h> 18 #include <linux/types.h> 19 #include <crypto/sha1.h> 20 #include <crypto/sha1_base.h> 21 #include <asm/byteorder.h> 22 23 const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = { 24 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, 25 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, 26 0xaf, 0xd8, 0x07, 0x09 27 }; 28 EXPORT_SYMBOL_GPL(sha1_zero_message_hash); 29 30 static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src, 31 int blocks) 32 { 33 u32 temp[SHA1_WORKSPACE_WORDS]; 34 35 while (blocks--) { 36 sha1_transform(sst->state, src, temp); 37 src += SHA1_BLOCK_SIZE; 38 } 39 memzero_explicit(temp, sizeof(temp)); 40 } 41 42 int crypto_sha1_update(struct shash_desc *desc, const u8 *data, 43 unsigned int len) 44 { 45 return sha1_base_do_update(desc, data, len, sha1_generic_block_fn); 46 } 47 EXPORT_SYMBOL(crypto_sha1_update); 48 49 static int sha1_final(struct shash_desc *desc, u8 *out) 50 { 51 sha1_base_do_finalize(desc, sha1_generic_block_fn); 52 return sha1_base_finish(desc, out); 53 } 54 55 int crypto_sha1_finup(struct shash_desc *desc, const u8 *data, 56 unsigned int len, u8 *out) 57 { 58 sha1_base_do_update(desc, data, len, sha1_generic_block_fn); 59 return sha1_final(desc, out); 60 } 61 EXPORT_SYMBOL(crypto_sha1_finup); 62 63 static struct shash_alg alg = { 64 .digestsize = SHA1_DIGEST_SIZE, 65 .init = sha1_base_init, 66 .update = crypto_sha1_update, 67 .final = sha1_final, 68 .finup = crypto_sha1_finup, 69 .descsize = sizeof(struct sha1_state), 70 .base = { 71 .cra_name = "sha1", 72 .cra_driver_name= "sha1-generic", 73 .cra_priority = 100, 74 .cra_blocksize = SHA1_BLOCK_SIZE, 75 .cra_module = THIS_MODULE, 76 } 77 }; 78 79 static int __init sha1_generic_mod_init(void) 80 { 81 return crypto_register_shash(&alg); 82 } 83 84 static void __exit sha1_generic_mod_fini(void) 85 { 86 crypto_unregister_shash(&alg); 87 } 88 89 subsys_initcall(sha1_generic_mod_init); 90 module_exit(sha1_generic_mod_fini); 91 92 MODULE_LICENSE("GPL"); 93 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); 94 95 MODULE_ALIAS_CRYPTO("sha1"); 96 MODULE_ALIAS_CRYPTO("sha1-generic"); 97