crypto/sm3_generic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and
   4  * described at https://tools.ietf.org/html/draft-shen-sm3-hash-01
   5  *
   6  * Copyright (C) 2017 ARM Limited or its affiliates.
   7  * Written by Gilad Ben-Yossef <gilad@benyossef.com>
   8  * Copyright (C) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
   9  */
  10
  11 #include <crypto/internal/hash.h>
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/mm.h>
  15 #include <linux/types.h>
  16 #include <crypto/sm3.h>
  17 #include <crypto/sm3_base.h>
  18 #include <linux/bitops.h>
  19 #include <asm/byteorder.h>
  20 #include <linux/unaligned.h>
  21
  22 const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
  23         0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
  24         0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F,
  25         0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74,
  26         0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B
  27 };
  28 EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
  29
  30 static int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
  31                           unsigned int len)
  32 {
  33         sm3_update(shash_desc_ctx(desc), data, len);
  34         return 0;
  35 }
  36
  37 static int crypto_sm3_final(struct shash_desc *desc, u8 *out)
  38 {
  39         sm3_final(shash_desc_ctx(desc), out);
  40         return 0;
  41 }
  42
  43 static int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
  44                         unsigned int len, u8 *hash)
  45 {
  46         struct sm3_state *sctx = shash_desc_ctx(desc);
  47
  48         if (len)
  49                 sm3_update(sctx, data, len);
  50         sm3_final(sctx, hash);
  51         return 0;
  52 }
  53
  54 static struct shash_alg sm3_alg = {
  55         .digestsize     =       SM3_DIGEST_SIZE,
  56         .init           =       sm3_base_init,
  57         .update         =       crypto_sm3_update,
  58         .final          =       crypto_sm3_final,
  59         .finup          =       crypto_sm3_finup,
  60         .descsize       =       sizeof(struct sm3_state),
  61         .base           =       {
  62                 .cra_name        =      "sm3",
  63                 .cra_driver_name =      "sm3-generic",
  64                 .cra_priority   =       100,
  65                 .cra_blocksize   =      SM3_BLOCK_SIZE,
  66                 .cra_module      =      THIS_MODULE,
  67         }
  68 };
  69
  70 static int __init sm3_generic_mod_init(void)
  71 {
  72         return crypto_register_shash(&sm3_alg);
  73 }
  74
  75 static void __exit sm3_generic_mod_fini(void)
  76 {
  77         crypto_unregister_shash(&sm3_alg);
  78 }
  79
  80 subsys_initcall(sm3_generic_mod_init);
  81 module_exit(sm3_generic_mod_fini);
  82
  83 MODULE_LICENSE("GPL v2");
  84 MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
  85
  86 MODULE_ALIAS_CRYPTO("sm3");
  87 MODULE_ALIAS_CRYPTO("sm3-generic");