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Linux/crypto/sm3_generic.c

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  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 int crypto_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 EXPORT_SYMBOL(crypto_sm3_final);
158 
159 int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
160                         unsigned int len, u8 *hash)
161 {
162         sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
163         return crypto_sm3_final(desc, hash);
164 }
165 EXPORT_SYMBOL(crypto_sm3_finup);
166 
167 static struct shash_alg sm3_alg = {
168         .digestsize     =       SM3_DIGEST_SIZE,
169         .init           =       sm3_base_init,
170         .update         =       crypto_sm3_update,
171         .final          =       crypto_sm3_final,
172         .finup          =       crypto_sm3_finup,
173         .descsize       =       sizeof(struct sm3_state),
174         .base           =       {
175                 .cra_name        =      "sm3",
176                 .cra_driver_name =      "sm3-generic",
177                 .cra_blocksize   =      SM3_BLOCK_SIZE,
178                 .cra_module      =      THIS_MODULE,
179         }
180 };
181 
182 static int __init sm3_generic_mod_init(void)
183 {
184         return crypto_register_shash(&sm3_alg);
185 }
186 
187 static void __exit sm3_generic_mod_fini(void)
188 {
189         crypto_unregister_shash(&sm3_alg);
190 }
191 
192 subsys_initcall(sm3_generic_mod_init);
193 module_exit(sm3_generic_mod_fini);
194 
195 MODULE_LICENSE("GPL v2");
196 MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
197 
198 MODULE_ALIAS_CRYPTO("sm3");
199 MODULE_ALIAS_CRYPTO("sm3-generic");
200 

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