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  */
   9
  10 #include <crypto/internal/hash.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/mm.h>
  14 #include <linux/types.h>
  15 #include <crypto/sm3.h>
  16 #include <crypto/sm3_base.h>
  17 #include <linux/bitops.h>
  18 #include <asm/byteorder.h>
  19 #include <asm/unaligned.h>
  20
  21 const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
  22         0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
  23         0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F,
  24         0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74,
  25         0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B
  26 };
  27 EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
  28
  29 static inline u32 p0(u32 x)
  30 {
  31         return x ^ rol32(x, 9) ^ rol32(x, 17);
  32 }
  33
  34 static inline u32 p1(u32 x)
  35 {
  36         return x ^ rol32(x, 15) ^ rol32(x, 23);
  37 }
  38
  39 static inline u32 ff(unsigned int n, u32 a, u32 b, u32 c)
  40 {
  41         return (n < 16) ? (a ^ b ^ c) : ((a & b) | (a & c) | (b & c));
  42 }
  43
  44 static inline u32 gg(unsigned int n, u32 e, u32 f, u32 g)
  45 {
  46         return (n < 16) ? (e ^ f ^ g) : ((e & f) | ((~e) & g));
  47 }
  48
  49 static inline u32 t(unsigned int n)
  50 {
  51         return (n < 16) ? SM3_T1 : SM3_T2;
  52 }
  53
  54 static void sm3_expand(u32 *t, u32 *w, u32 *wt)
  55 {
  56         int i;
  57         unsigned int tmp;
  58
  59         /* load the input */
  60         for (i = 0; i <= 15; i++)
  61                 w[i] = get_unaligned_be32((__u32 *)t + i);
  62
  63         for (i = 16; i <= 67; i++) {
  64                 tmp = w[i - 16] ^ w[i - 9] ^ rol32(w[i - 3], 15);
  65                 w[i] = p1(tmp) ^ (rol32(w[i - 13], 7)) ^ w[i - 6];
  66         }
  67
  68         for (i = 0; i <= 63; i++)
  69                 wt[i] = w[i] ^ w[i + 4];
  70 }
  71
  72 static void sm3_compress(u32 *w, u32 *wt, u32 *m)
  73 {
  74         u32 ss1;
  75         u32 ss2;
  76         u32 tt1;
  77         u32 tt2;
  78         u32 a, b, c, d, e, f, g, h;
  79         int i;
  80
  81         a = m[0];
  82         b = m[1];
  83         c = m[2];
  84         d = m[3];
  85         e = m[4];
  86         f = m[5];
  87         g = m[6];
  88         h = m[7];
  89
  90         for (i = 0; i <= 63; i++) {
  91
  92                 ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i & 31)), 7);
  93
  94                 ss2 = ss1 ^ rol32(a, 12);
  95
  96                 tt1 = ff(i, a, b, c) + d + ss2 + *wt;
  97                 wt++;
  98
  99                 tt2 = gg(i, e, f, g) + h + ss1 + *w;
 100                 w++;
 101
 102                 d = c;
 103                 c = rol32(b, 9);
 104                 b = a;
 105                 a = tt1;
 106                 h = g;
 107                 g = rol32(f, 19);
 108                 f = e;
 109                 e = p0(tt2);
 110         }
 111
 112         m[0] = a ^ m[0];
 113         m[1] = b ^ m[1];
 114         m[2] = c ^ m[2];
 115         m[3] = d ^ m[3];
 116         m[4] = e ^ m[4];
 117         m[5] = f ^ m[5];
 118         m[6] = g ^ m[6];
 119         m[7] = h ^ m[7];
 120
 121         a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
 122 }
 123
 124 static void sm3_transform(struct sm3_state *sst, u8 const *src)
 125 {
 126         unsigned int w[68];
 127         unsigned int wt[64];
 128
 129         sm3_expand((u32 *)src, w, wt);
 130         sm3_compress(w, wt, sst->state);
 131
 132         memzero_explicit(w, sizeof(w));
 133         memzero_explicit(wt, sizeof(wt));
 134 }
 135
 136 static void sm3_generic_block_fn(struct sm3_state *sst, u8 const *src,
 137                                     int blocks)
 138 {
 139         while (blocks--) {
 140                 sm3_transform(sst, src);
 141                 src += SM3_BLOCK_SIZE;
 142         }
 143 }
 144
 145 int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
 146                           unsigned int len)
 147 {
 148         return sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
 149 }
 150 EXPORT_SYMBOL(crypto_sm3_update);
 151
 152 static int sm3_final(struct shash_desc *desc, u8 *out)
 153 {
 154         sm3_base_do_finalize(desc, sm3_generic_block_fn);
 155         return sm3_base_finish(desc, out);
 156 }
 157
 158 int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
 159                         unsigned int len, u8 *hash)
 160 {
 161         sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
 162         return sm3_final(desc, hash);
 163 }
 164 EXPORT_SYMBOL(crypto_sm3_finup);
 165
 166 static struct shash_alg sm3_alg = {
 167         .digestsize     =       SM3_DIGEST_SIZE,
 168         .init           =       sm3_base_init,
 169         .update         =       crypto_sm3_update,
 170         .final          =       sm3_final,
 171         .finup          =       crypto_sm3_finup,
 172         .descsize       =       sizeof(struct sm3_state),
 173         .base           =       {
 174                 .cra_name        =      "sm3",
 175                 .cra_driver_name =      "sm3-generic",
 176                 .cra_blocksize   =      SM3_BLOCK_SIZE,
 177                 .cra_module      =      THIS_MODULE,
 178         }
 179 };
 180
 181 static int __init sm3_generic_mod_init(void)
 182 {
 183         return crypto_register_shash(&sm3_alg);
 184 }
 185
 186 static void __exit sm3_generic_mod_fini(void)
 187 {
 188         crypto_unregister_shash(&sm3_alg);
 189 }
 190
 191 subsys_initcall(sm3_generic_mod_init);
 192 module_exit(sm3_generic_mod_fini);
 193
 194 MODULE_LICENSE("GPL v2");
 195 MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
 196
 197 MODULE_ALIAS_CRYPTO("sm3");
 198 MODULE_ALIAS_CRYPTO("sm3-generic");