1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and described
4 * at https://datatracker.ietf.org/doc/html/draft-sca-cfrg-sm3-02
5 *
6 * Copyright (C) 2017 ARM Limited or its affiliates.
7 * Copyright (C) 2017 Gilad Ben-Yossef <gilad@benyossef.com>
8 * Copyright (C) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
9 */
10
11 #include <linux/module.h>
12 #include <asm/unaligned.h>
13 #include <crypto/sm3.h>
14
15 static const u32 ____cacheline_aligned K[64] = {
16 0x79cc4519, 0xf3988a32, 0xe7311465, 0xce6228cb,
17 0x9cc45197, 0x3988a32f, 0x7311465e, 0xe6228cbc,
18 0xcc451979, 0x988a32f3, 0x311465e7, 0x6228cbce,
19 0xc451979c, 0x88a32f39, 0x11465e73, 0x228cbce6,
20 0x9d8a7a87, 0x3b14f50f, 0x7629ea1e, 0xec53d43c,
21 0xd8a7a879, 0xb14f50f3, 0x629ea1e7, 0xc53d43ce,
22 0x8a7a879d, 0x14f50f3b, 0x29ea1e76, 0x53d43cec,
23 0xa7a879d8, 0x4f50f3b1, 0x9ea1e762, 0x3d43cec5,
24 0x7a879d8a, 0xf50f3b14, 0xea1e7629, 0xd43cec53,
25 0xa879d8a7, 0x50f3b14f, 0xa1e7629e, 0x43cec53d,
26 0x879d8a7a, 0x0f3b14f5, 0x1e7629ea, 0x3cec53d4,
27 0x79d8a7a8, 0xf3b14f50, 0xe7629ea1, 0xcec53d43,
28 0x9d8a7a87, 0x3b14f50f, 0x7629ea1e, 0xec53d43c,
29 0xd8a7a879, 0xb14f50f3, 0x629ea1e7, 0xc53d43ce,
30 0x8a7a879d, 0x14f50f3b, 0x29ea1e76, 0x53d43cec,
31 0xa7a879d8, 0x4f50f3b1, 0x9ea1e762, 0x3d43cec5
32 };
33
34 /*
35 * Transform the message X which consists of 16 32-bit-words. See
36 * GM/T 004-2012 for details.
37 */
38 #define R(i, a, b, c, d, e, f, g, h, t, w1, w2) \
39 do { \
40 ss1 = rol32((rol32((a), 12) + (e) + (t)), 7); \
41 ss2 = ss1 ^ rol32((a), 12); \
42 d += FF ## i(a, b, c) + ss2 + ((w1) ^ (w2)); \
43 h += GG ## i(e, f, g) + ss1 + (w1); \
44 b = rol32((b), 9); \
45 f = rol32((f), 19); \
46 h = P0((h)); \
47 } while (0)
48
49 #define R1(a, b, c, d, e, f, g, h, t, w1, w2) \
50 R(1, a, b, c, d, e, f, g, h, t, w1, w2)
51 #define R2(a, b, c, d, e, f, g, h, t, w1, w2) \
52 R(2, a, b, c, d, e, f, g, h, t, w1, w2)
53
54 #define FF1(x, y, z) (x ^ y ^ z)
55 #define FF2(x, y, z) ((x & y) | (x & z) | (y & z))
56
57 #define GG1(x, y, z) FF1(x, y, z)
58 #define GG2(x, y, z) ((x & y) | (~x & z))
59
60 /* Message expansion */
61 #define P0(x) ((x) ^ rol32((x), 9) ^ rol32((x), 17))
62 #define P1(x) ((x) ^ rol32((x), 15) ^ rol32((x), 23))
63 #define I(i) (W[i] = get_unaligned_be32(data + i * 4))
64 #define W1(i) (W[i & 0x0f])
65 #define W2(i) (W[i & 0x0f] = \
66 P1(W[i & 0x0f] \
67 ^ W[(i-9) & 0x0f] \
68 ^ rol32(W[(i-3) & 0x0f], 15)) \
69 ^ rol32(W[(i-13) & 0x0f], 7) \
70 ^ W[(i-6) & 0x0f])
71
72 static void sm3_transform(struct sm3_state *sctx, u8 const *data, u32 W[16])
73 {
74 u32 a, b, c, d, e, f, g, h, ss1, ss2;
75
76 a = sctx->state[0];
77 b = sctx->state[1];
78 c = sctx->state[2];
79 d = sctx->state[3];
80 e = sctx->state[4];
81 f = sctx->state[5];
82 g = sctx->state[6];
83 h = sctx->state[7];
84
85 R1(a, b, c, d, e, f, g, h, K[0], I(0), I(4));
86 R1(d, a, b, c, h, e, f, g, K[1], I(1), I(5));
87 R1(c, d, a, b, g, h, e, f, K[2], I(2), I(6));
88 R1(b, c, d, a, f, g, h, e, K[3], I(3), I(7));
89 R1(a, b, c, d, e, f, g, h, K[4], W1(4), I(8));
90 R1(d, a, b, c, h, e, f, g, K[5], W1(5), I(9));
91 R1(c, d, a, b, g, h, e, f, K[6], W1(6), I(10));
92 R1(b, c, d, a, f, g, h, e, K[7], W1(7), I(11));
93 R1(a, b, c, d, e, f, g, h, K[8], W1(8), I(12));
94 R1(d, a, b, c, h, e, f, g, K[9], W1(9), I(13));
95 R1(c, d, a, b, g, h, e, f, K[10], W1(10), I(14));
96 R1(b, c, d, a, f, g, h, e, K[11], W1(11), I(15));
97 R1(a, b, c, d, e, f, g, h, K[12], W1(12), W2(16));
98 R1(d, a, b, c, h, e, f, g, K[13], W1(13), W2(17));
99 R1(c, d, a, b, g, h, e, f, K[14], W1(14), W2(18));
100 R1(b, c, d, a, f, g, h, e, K[15], W1(15), W2(19));
101
102 R2(a, b, c, d, e, f, g, h, K[16], W1(16), W2(20));
103 R2(d, a, b, c, h, e, f, g, K[17], W1(17), W2(21));
104 R2(c, d, a, b, g, h, e, f, K[18], W1(18), W2(22));
105 R2(b, c, d, a, f, g, h, e, K[19], W1(19), W2(23));
106 R2(a, b, c, d, e, f, g, h, K[20], W1(20), W2(24));
107 R2(d, a, b, c, h, e, f, g, K[21], W1(21), W2(25));
108 R2(c, d, a, b, g, h, e, f, K[22], W1(22), W2(26));
109 R2(b, c, d, a, f, g, h, e, K[23], W1(23), W2(27));
110 R2(a, b, c, d, e, f, g, h, K[24], W1(24), W2(28));
111 R2(d, a, b, c, h, e, f, g, K[25], W1(25), W2(29));
112 R2(c, d, a, b, g, h, e, f, K[26], W1(26), W2(30));
113 R2(b, c, d, a, f, g, h, e, K[27], W1(27), W2(31));
114 R2(a, b, c, d, e, f, g, h, K[28], W1(28), W2(32));
115 R2(d, a, b, c, h, e, f, g, K[29], W1(29), W2(33));
116 R2(c, d, a, b, g, h, e, f, K[30], W1(30), W2(34));
117 R2(b, c, d, a, f, g, h, e, K[31], W1(31), W2(35));
118
119 R2(a, b, c, d, e, f, g, h, K[32], W1(32), W2(36));
120 R2(d, a, b, c, h, e, f, g, K[33], W1(33), W2(37));
121 R2(c, d, a, b, g, h, e, f, K[34], W1(34), W2(38));
122 R2(b, c, d, a, f, g, h, e, K[35], W1(35), W2(39));
123 R2(a, b, c, d, e, f, g, h, K[36], W1(36), W2(40));
124 R2(d, a, b, c, h, e, f, g, K[37], W1(37), W2(41));
125 R2(c, d, a, b, g, h, e, f, K[38], W1(38), W2(42));
126 R2(b, c, d, a, f, g, h, e, K[39], W1(39), W2(43));
127 R2(a, b, c, d, e, f, g, h, K[40], W1(40), W2(44));
128 R2(d, a, b, c, h, e, f, g, K[41], W1(41), W2(45));
129 R2(c, d, a, b, g, h, e, f, K[42], W1(42), W2(46));
130 R2(b, c, d, a, f, g, h, e, K[43], W1(43), W2(47));
131 R2(a, b, c, d, e, f, g, h, K[44], W1(44), W2(48));
132 R2(d, a, b, c, h, e, f, g, K[45], W1(45), W2(49));
133 R2(c, d, a, b, g, h, e, f, K[46], W1(46), W2(50));
134 R2(b, c, d, a, f, g, h, e, K[47], W1(47), W2(51));
135
136 R2(a, b, c, d, e, f, g, h, K[48], W1(48), W2(52));
137 R2(d, a, b, c, h, e, f, g, K[49], W1(49), W2(53));
138 R2(c, d, a, b, g, h, e, f, K[50], W1(50), W2(54));
139 R2(b, c, d, a, f, g, h, e, K[51], W1(51), W2(55));
140 R2(a, b, c, d, e, f, g, h, K[52], W1(52), W2(56));
141 R2(d, a, b, c, h, e, f, g, K[53], W1(53), W2(57));
142 R2(c, d, a, b, g, h, e, f, K[54], W1(54), W2(58));
143 R2(b, c, d, a, f, g, h, e, K[55], W1(55), W2(59));
144 R2(a, b, c, d, e, f, g, h, K[56], W1(56), W2(60));
145 R2(d, a, b, c, h, e, f, g, K[57], W1(57), W2(61));
146 R2(c, d, a, b, g, h, e, f, K[58], W1(58), W2(62));
147 R2(b, c, d, a, f, g, h, e, K[59], W1(59), W2(63));
148 R2(a, b, c, d, e, f, g, h, K[60], W1(60), W2(64));
149 R2(d, a, b, c, h, e, f, g, K[61], W1(61), W2(65));
150 R2(c, d, a, b, g, h, e, f, K[62], W1(62), W2(66));
151 R2(b, c, d, a, f, g, h, e, K[63], W1(63), W2(67));
152
153 sctx->state[0] ^= a;
154 sctx->state[1] ^= b;
155 sctx->state[2] ^= c;
156 sctx->state[3] ^= d;
157 sctx->state[4] ^= e;
158 sctx->state[5] ^= f;
159 sctx->state[6] ^= g;
160 sctx->state[7] ^= h;
161 }
162 #undef R
163 #undef R1
164 #undef R2
165 #undef I
166 #undef W1
167 #undef W2
168
169 static inline void sm3_block(struct sm3_state *sctx,
170 u8 const *data, int blocks, u32 W[16])
171 {
172 while (blocks--) {
173 sm3_transform(sctx, data, W);
174 data += SM3_BLOCK_SIZE;
175 }
176 }
177
178 void sm3_update(struct sm3_state *sctx, const u8 *data, unsigned int len)
179 {
180 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
181 u32 W[16];
182
183 sctx->count += len;
184
185 if ((partial + len) >= SM3_BLOCK_SIZE) {
186 int blocks;
187
188 if (partial) {
189 int p = SM3_BLOCK_SIZE - partial;
190
191 memcpy(sctx->buffer + partial, data, p);
192 data += p;
193 len -= p;
194
195 sm3_block(sctx, sctx->buffer, 1, W);
196 }
197
198 blocks = len / SM3_BLOCK_SIZE;
199 len %= SM3_BLOCK_SIZE;
200
201 if (blocks) {
202 sm3_block(sctx, data, blocks, W);
203 data += blocks * SM3_BLOCK_SIZE;
204 }
205
206 memzero_explicit(W, sizeof(W));
207
208 partial = 0;
209 }
210 if (len)
211 memcpy(sctx->buffer + partial, data, len);
212 }
213 EXPORT_SYMBOL_GPL(sm3_update);
214
215 void sm3_final(struct sm3_state *sctx, u8 *out)
216 {
217 const int bit_offset = SM3_BLOCK_SIZE - sizeof(u64);
218 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
219 __be32 *digest = (__be32 *)out;
220 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
221 u32 W[16];
222 int i;
223
224 sctx->buffer[partial++] = 0x80;
225 if (partial > bit_offset) {
226 memset(sctx->buffer + partial, 0, SM3_BLOCK_SIZE - partial);
227 partial = 0;
228
229 sm3_block(sctx, sctx->buffer, 1, W);
230 }
231
232 memset(sctx->buffer + partial, 0, bit_offset - partial);
233 *bits = cpu_to_be64(sctx->count << 3);
234 sm3_block(sctx, sctx->buffer, 1, W);
235
236 for (i = 0; i < 8; i++)
237 put_unaligned_be32(sctx->state[i], digest++);
238
239 /* Zeroize sensitive information. */
240 memzero_explicit(W, sizeof(W));
241 memzero_explicit(sctx, sizeof(*sctx));
242 }
243 EXPORT_SYMBOL_GPL(sm3_final);
244
245 MODULE_DESCRIPTION("Generic SM3 library");
246 MODULE_LICENSE("GPL v2");
247
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