97 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Cryptographic API.4 *5 * SHA1 Secure Hash Algorithm.6 *7 * Derived from cryptoapi implementation, adapted for in-place8 * 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 23const 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, 0x0927};28EXPORT_SYMBOL_GPL(sha1_zero_message_hash);29 30static 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 42int 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}47EXPORT_SYMBOL(crypto_sha1_update);48 49static 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 55int 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}61EXPORT_SYMBOL(crypto_sha1_finup);62 63static 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 79static int __init sha1_generic_mod_init(void)80{81 return crypto_register_shash(&alg);82}83 84static void __exit sha1_generic_mod_fini(void)85{86 crypto_unregister_shash(&alg);87}88 89subsys_initcall(sha1_generic_mod_init);90module_exit(sha1_generic_mod_fini);91 92MODULE_LICENSE("GPL");93MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");94 95MODULE_ALIAS_CRYPTO("sha1");96MODULE_ALIAS_CRYPTO("sha1-generic");97