crypto/sm3_generic.c

   1 /*
   2  * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and
   3  * described at https://tools.ietf.org/html/draft-shen-sm3-hash-01
   4  *
   5  * Copyright (C) 2017 ARM Limited or its affiliates.
   6  * Written by Gilad Ben-Yossef <gilad@benyossef.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <crypto/internal/hash.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/mm.h>
  25 #include <linux/types.h>
  26 #include <crypto/sm3.h>
  27 #include <crypto/sm3_base.h>
  28 #include <linux/bitops.h>
  29 #include <asm/byteorder.h>
  30 #include <asm/unaligned.h>
  31
  32 const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
  33         0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
  34         0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F,
  35         0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74,
  36         0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B
  37 };
  38 EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
  39
  40 static inline u32 p0(u32 x)
  41 {
  42         return x ^ rol32(x, 9) ^ rol32(x, 17);
  43 }
  44
  45 static inline u32 p1(u32 x)
  46 {
  47         return x ^ rol32(x, 15) ^ rol32(x, 23);
  48 }
  49
  50 static inline u32 ff(unsigned int n, u32 a, u32 b, u32 c)
  51 {
  52         return (n < 16) ? (a ^ b ^ c) : ((a & b) | (a & c) | (b & c));
  53 }
  54
  55 static inline u32 gg(unsigned int n, u32 e, u32 f, u32 g)
  56 {
  57         return (n < 16) ? (e ^ f ^ g) : ((e & f) | ((~e) & g));
  58 }
  59
  60 static inline u32 t(unsigned int n)
  61 {
  62         return (n < 16) ? SM3_T1 : SM3_T2;
  63 }
  64
  65 static void sm3_expand(u32 *t, u32 *w, u32 *wt)
  66 {
  67         int i;
  68         unsigned int tmp;
  69
  70         /* load the input */
  71         for (i = 0; i <= 15; i++)
  72                 w[i] = get_unaligned_be32((__u32 *)t + i);
  73
  74         for (i = 16; i <= 67; i++) {
  75                 tmp = w[i - 16] ^ w[i - 9] ^ rol32(w[i - 3], 15);
  76                 w[i] = p1(tmp) ^ (rol32(w[i - 13], 7)) ^ w[i - 6];
  77         }
  78
  79         for (i = 0; i <= 63; i++)
  80                 wt[i] = w[i] ^ w[i + 4];
  81 }
  82
  83 static void sm3_compress(u32 *w, u32 *wt, u32 *m)
  84 {
  85         u32 ss1;
  86         u32 ss2;
  87         u32 tt1;
  88         u32 tt2;
  89         u32 a, b, c, d, e, f, g, h;
  90         int i;
  91
  92         a = m[0];
  93         b = m[1];
  94         c = m[2];
  95         d = m[3];
  96         e = m[4];
  97         f = m[5];
  98         g = m[6];
  99         h = m[7];
 100
 101         for (i = 0; i <= 63; i++) {
 102
 103                 ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i)), 7);
 104
 105                 ss2 = ss1 ^ rol32(a, 12);
 106
 107                 tt1 = ff(i, a, b, c) + d + ss2 + *wt;
 108                 wt++;
 109
 110                 tt2 = gg(i, e, f, g) + h + ss1 + *w;
 111                 w++;
 112
 113                 d = c;
 114                 c = rol32(b, 9);
 115                 b = a;
 116                 a = tt1;
 117                 h = g;
 118                 g = rol32(f, 19);
 119                 f = e;
 120                 e = p0(tt2);
 121         }
 122
 123         m[0] = a ^ m[0];
 124         m[1] = b ^ m[1];
 125         m[2] = c ^ m[2];
 126         m[3] = d ^ m[3];
 127         m[4] = e ^ m[4];
 128         m[5] = f ^ m[5];
 129         m[6] = g ^ m[6];
 130         m[7] = h ^ m[7];
 131
 132         a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
 133 }
 134
 135 static void sm3_transform(struct sm3_state *sst, u8 const *src)
 136 {
 137         unsigned int w[68];
 138         unsigned int wt[64];
 139
 140         sm3_expand((u32 *)src, w, wt);
 141         sm3_compress(w, wt, sst->state);
 142
 143         memzero_explicit(w, sizeof(w));
 144         memzero_explicit(wt, sizeof(wt));
 145 }
 146
 147 static void sm3_generic_block_fn(struct sm3_state *sst, u8 const *src,
 148                                     int blocks)
 149 {
 150         while (blocks--) {
 151                 sm3_transform(sst, src);
 152                 src += SM3_BLOCK_SIZE;
 153         }
 154 }
 155
 156 int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
 157                           unsigned int len)
 158 {
 159         return sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
 160 }
 161 EXPORT_SYMBOL(crypto_sm3_update);
 162
 163 static int sm3_final(struct shash_desc *desc, u8 *out)
 164 {
 165         sm3_base_do_finalize(desc, sm3_generic_block_fn);
 166         return sm3_base_finish(desc, out);
 167 }
 168
 169 int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
 170                         unsigned int len, u8 *hash)
 171 {
 172         sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
 173         return sm3_final(desc, hash);
 174 }
 175 EXPORT_SYMBOL(crypto_sm3_finup);
 176
 177 static struct shash_alg sm3_alg = {
 178         .digestsize     =       SM3_DIGEST_SIZE,
 179         .init           =       sm3_base_init,
 180         .update         =       crypto_sm3_update,
 181         .final          =       sm3_final,
 182         .finup          =       crypto_sm3_finup,
 183         .descsize       =       sizeof(struct sm3_state),
 184         .base           =       {
 185                 .cra_name        =      "sm3",
 186                 .cra_driver_name =      "sm3-generic",
 187                 .cra_flags       =      CRYPTO_ALG_TYPE_SHASH,
 188                 .cra_blocksize   =      SM3_BLOCK_SIZE,
 189                 .cra_module      =      THIS_MODULE,
 190         }
 191 };
 192
 193 static int __init sm3_generic_mod_init(void)
 194 {
 195         return crypto_register_shash(&sm3_alg);
 196 }
 197
 198 static void __exit sm3_generic_mod_fini(void)
 199 {
 200         crypto_unregister_shash(&sm3_alg);
 201 }
 202
 203 module_init(sm3_generic_mod_init);
 204 module_exit(sm3_generic_mod_fini);
 205
 206 MODULE_LICENSE("GPL v2");
 207 MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
 208
 209 MODULE_ALIAS_CRYPTO("sm3");
 210 MODULE_ALIAS_CRYPTO("sm3-generic");