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Linux/crypto/sha1_generic.c

  1 /*
  2  * Cryptographic API.
  3  *
  4  * SHA1 Secure Hash Algorithm.
  5  *
  6  * Derived from cryptoapi implementation, adapted for in-place
  7  * scatterlist interface.
  8  *
  9  * Copyright (c) Alan Smithee.
 10  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
 11  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
 12  *
 13  * This program is free software; you can redistribute it and/or modify it
 14  * under the terms of the GNU General Public License as published by the Free
 15  * Software Foundation; either version 2 of the License, or (at your option)
 16  * any later version.
 17  *
 18  */
 19 #include <crypto/internal/hash.h>
 20 #include <linux/init.h>
 21 #include <linux/module.h>
 22 #include <linux/mm.h>
 23 #include <linux/cryptohash.h>
 24 #include <linux/types.h>
 25 #include <crypto/sha.h>
 26 #include <crypto/sha1_base.h>
 27 #include <asm/byteorder.h>
 28 
 29 const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
 30         0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
 31         0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
 32         0xaf, 0xd8, 0x07, 0x09
 33 };
 34 EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
 35 
 36 static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
 37                                   int blocks)
 38 {
 39         u32 temp[SHA_WORKSPACE_WORDS];
 40 
 41         while (blocks--) {
 42                 sha_transform(sst->state, src, temp);
 43                 src += SHA1_BLOCK_SIZE;
 44         }
 45         memzero_explicit(temp, sizeof(temp));
 46 }
 47 
 48 int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
 49                        unsigned int len)
 50 {
 51         return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
 52 }
 53 EXPORT_SYMBOL(crypto_sha1_update);
 54 
 55 static int sha1_final(struct shash_desc *desc, u8 *out)
 56 {
 57         sha1_base_do_finalize(desc, sha1_generic_block_fn);
 58         return sha1_base_finish(desc, out);
 59 }
 60 
 61 int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
 62                       unsigned int len, u8 *out)
 63 {
 64         sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
 65         return sha1_final(desc, out);
 66 }
 67 EXPORT_SYMBOL(crypto_sha1_finup);
 68 
 69 static struct shash_alg alg = {
 70         .digestsize     =       SHA1_DIGEST_SIZE,
 71         .init           =       sha1_base_init,
 72         .update         =       crypto_sha1_update,
 73         .final          =       sha1_final,
 74         .finup          =       crypto_sha1_finup,
 75         .descsize       =       sizeof(struct sha1_state),
 76         .base           =       {
 77                 .cra_name       =       "sha1",
 78                 .cra_driver_name=       "sha1-generic",
 79                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 80                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
 81                 .cra_module     =       THIS_MODULE,
 82         }
 83 };
 84 
 85 static int __init sha1_generic_mod_init(void)
 86 {
 87         return crypto_register_shash(&alg);
 88 }
 89 
 90 static void __exit sha1_generic_mod_fini(void)
 91 {
 92         crypto_unregister_shash(&alg);
 93 }
 94 
 95 module_init(sha1_generic_mod_init);
 96 module_exit(sha1_generic_mod_fini);
 97 
 98 MODULE_LICENSE("GPL");
 99 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
100 
101 MODULE_ALIAS_CRYPTO("sha1");
102 MODULE_ALIAS_CRYPTO("sha1-generic");
103 

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