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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 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 <[email protected]>
8 * Copyright (C) 2021 Tianjia Zhang <[email protected]>
9 */
10
11#include <crypto/sm3.h>
12#include <linux/export.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/string.h>
16#include <linux/unaligned.h>
17
18static const struct sm3_block_state sm3_iv = {
19 .h = {
20 SM3_IVA, SM3_IVB, SM3_IVC, SM3_IVD,
21 SM3_IVE, SM3_IVF, SM3_IVG, SM3_IVH,
22 },
23};
24
25static const u32 ____cacheline_aligned K[64] = {
26 0x79cc4519, 0xf3988a32, 0xe7311465, 0xce6228cb,
27 0x9cc45197, 0x3988a32f, 0x7311465e, 0xe6228cbc,
28 0xcc451979, 0x988a32f3, 0x311465e7, 0x6228cbce,
29 0xc451979c, 0x88a32f39, 0x11465e73, 0x228cbce6,
30 0x9d8a7a87, 0x3b14f50f, 0x7629ea1e, 0xec53d43c,
31 0xd8a7a879, 0xb14f50f3, 0x629ea1e7, 0xc53d43ce,
32 0x8a7a879d, 0x14f50f3b, 0x29ea1e76, 0x53d43cec,
33 0xa7a879d8, 0x4f50f3b1, 0x9ea1e762, 0x3d43cec5,
34 0x7a879d8a, 0xf50f3b14, 0xea1e7629, 0xd43cec53,
35 0xa879d8a7, 0x50f3b14f, 0xa1e7629e, 0x43cec53d,
36 0x879d8a7a, 0x0f3b14f5, 0x1e7629ea, 0x3cec53d4,
37 0x79d8a7a8, 0xf3b14f50, 0xe7629ea1, 0xcec53d43,
38 0x9d8a7a87, 0x3b14f50f, 0x7629ea1e, 0xec53d43c,
39 0xd8a7a879, 0xb14f50f3, 0x629ea1e7, 0xc53d43ce,
40 0x8a7a879d, 0x14f50f3b, 0x29ea1e76, 0x53d43cec,
41 0xa7a879d8, 0x4f50f3b1, 0x9ea1e762, 0x3d43cec5
42};
43
44/*
45 * Transform the message X which consists of 16 32-bit-words. See
46 * GM/T 004-2012 for details.
47 */
48#define R(i, a, b, c, d, e, f, g, h, t, w1, w2) \
49 do { \
50 ss1 = rol32((rol32((a), 12) + (e) + (t)), 7); \
51 ss2 = ss1 ^ rol32((a), 12); \
52 d += FF ## i(a, b, c) + ss2 + ((w1) ^ (w2)); \
53 h += GG ## i(e, f, g) + ss1 + (w1); \
54 b = rol32((b), 9); \
55 f = rol32((f), 19); \
56 h = P0((h)); \
57 } while (0)
58
59#define R1(a, b, c, d, e, f, g, h, t, w1, w2) \
60 R(1, a, b, c, d, e, f, g, h, t, w1, w2)
61#define R2(a, b, c, d, e, f, g, h, t, w1, w2) \
62 R(2, a, b, c, d, e, f, g, h, t, w1, w2)
63
64#define FF1(x, y, z) (x ^ y ^ z)
65#define FF2(x, y, z) ((x & y) | (x & z) | (y & z))
66
67#define GG1(x, y, z) FF1(x, y, z)
68#define GG2(x, y, z) ((x & y) | (~x & z))
69
70/* Message expansion */
71#define P0(x) ((x) ^ rol32((x), 9) ^ rol32((x), 17))
72#define P1(x) ((x) ^ rol32((x), 15) ^ rol32((x), 23))
73#define I(i) (W[i] = get_unaligned_be32(data + i * 4))
74#define W1(i) (W[i & 0x0f])
75#define W2(i) (W[i & 0x0f] = \
76 P1(W[i & 0x0f] \
77 ^ W[(i-9) & 0x0f] \
78 ^ rol32(W[(i-3) & 0x0f], 15)) \
79 ^ rol32(W[(i-13) & 0x0f], 7) \
80 ^ W[(i-6) & 0x0f])
81
82static void sm3_block_generic(struct sm3_block_state *state,
83 const u8 data[SM3_BLOCK_SIZE], u32 W[16])
84{
85 u32 a, b, c, d, e, f, g, h, ss1, ss2;
86
87 a = state->h[0];
88 b = state->h[1];
89 c = state->h[2];
90 d = state->h[3];
91 e = state->h[4];
92 f = state->h[5];
93 g = state->h[6];
94 h = state->h[7];
95
96 R1(a, b, c, d, e, f, g, h, K[0], I(0), I(4));
97 R1(d, a, b, c, h, e, f, g, K[1], I(1), I(5));
98 R1(c, d, a, b, g, h, e, f, K[2], I(2), I(6));
99 R1(b, c, d, a, f, g, h, e, K[3], I(3), I(7));
100 R1(a, b, c, d, e, f, g, h, K[4], W1(4), I(8));
101 R1(d, a, b, c, h, e, f, g, K[5], W1(5), I(9));
102 R1(c, d, a, b, g, h, e, f, K[6], W1(6), I(10));
103 R1(b, c, d, a, f, g, h, e, K[7], W1(7), I(11));
104 R1(a, b, c, d, e, f, g, h, K[8], W1(8), I(12));
105 R1(d, a, b, c, h, e, f, g, K[9], W1(9), I(13));
106 R1(c, d, a, b, g, h, e, f, K[10], W1(10), I(14));
107 R1(b, c, d, a, f, g, h, e, K[11], W1(11), I(15));
108 R1(a, b, c, d, e, f, g, h, K[12], W1(12), W2(16));
109 R1(d, a, b, c, h, e, f, g, K[13], W1(13), W2(17));
110 R1(c, d, a, b, g, h, e, f, K[14], W1(14), W2(18));
111 R1(b, c, d, a, f, g, h, e, K[15], W1(15), W2(19));
112
113 R2(a, b, c, d, e, f, g, h, K[16], W1(16), W2(20));
114 R2(d, a, b, c, h, e, f, g, K[17], W1(17), W2(21));
115 R2(c, d, a, b, g, h, e, f, K[18], W1(18), W2(22));
116 R2(b, c, d, a, f, g, h, e, K[19], W1(19), W2(23));
117 R2(a, b, c, d, e, f, g, h, K[20], W1(20), W2(24));
118 R2(d, a, b, c, h, e, f, g, K[21], W1(21), W2(25));
119 R2(c, d, a, b, g, h, e, f, K[22], W1(22), W2(26));
120 R2(b, c, d, a, f, g, h, e, K[23], W1(23), W2(27));
121 R2(a, b, c, d, e, f, g, h, K[24], W1(24), W2(28));
122 R2(d, a, b, c, h, e, f, g, K[25], W1(25), W2(29));
123 R2(c, d, a, b, g, h, e, f, K[26], W1(26), W2(30));
124 R2(b, c, d, a, f, g, h, e, K[27], W1(27), W2(31));
125 R2(a, b, c, d, e, f, g, h, K[28], W1(28), W2(32));
126 R2(d, a, b, c, h, e, f, g, K[29], W1(29), W2(33));
127 R2(c, d, a, b, g, h, e, f, K[30], W1(30), W2(34));
128 R2(b, c, d, a, f, g, h, e, K[31], W1(31), W2(35));
129
130 R2(a, b, c, d, e, f, g, h, K[32], W1(32), W2(36));
131 R2(d, a, b, c, h, e, f, g, K[33], W1(33), W2(37));
132 R2(c, d, a, b, g, h, e, f, K[34], W1(34), W2(38));
133 R2(b, c, d, a, f, g, h, e, K[35], W1(35), W2(39));
134 R2(a, b, c, d, e, f, g, h, K[36], W1(36), W2(40));
135 R2(d, a, b, c, h, e, f, g, K[37], W1(37), W2(41));
136 R2(c, d, a, b, g, h, e, f, K[38], W1(38), W2(42));
137 R2(b, c, d, a, f, g, h, e, K[39], W1(39), W2(43));
138 R2(a, b, c, d, e, f, g, h, K[40], W1(40), W2(44));
139 R2(d, a, b, c, h, e, f, g, K[41], W1(41), W2(45));
140 R2(c, d, a, b, g, h, e, f, K[42], W1(42), W2(46));
141 R2(b, c, d, a, f, g, h, e, K[43], W1(43), W2(47));
142 R2(a, b, c, d, e, f, g, h, K[44], W1(44), W2(48));
143 R2(d, a, b, c, h, e, f, g, K[45], W1(45), W2(49));
144 R2(c, d, a, b, g, h, e, f, K[46], W1(46), W2(50));
145 R2(b, c, d, a, f, g, h, e, K[47], W1(47), W2(51));
146
147 R2(a, b, c, d, e, f, g, h, K[48], W1(48), W2(52));
148 R2(d, a, b, c, h, e, f, g, K[49], W1(49), W2(53));
149 R2(c, d, a, b, g, h, e, f, K[50], W1(50), W2(54));
150 R2(b, c, d, a, f, g, h, e, K[51], W1(51), W2(55));
151 R2(a, b, c, d, e, f, g, h, K[52], W1(52), W2(56));
152 R2(d, a, b, c, h, e, f, g, K[53], W1(53), W2(57));
153 R2(c, d, a, b, g, h, e, f, K[54], W1(54), W2(58));
154 R2(b, c, d, a, f, g, h, e, K[55], W1(55), W2(59));
155 R2(a, b, c, d, e, f, g, h, K[56], W1(56), W2(60));
156 R2(d, a, b, c, h, e, f, g, K[57], W1(57), W2(61));
157 R2(c, d, a, b, g, h, e, f, K[58], W1(58), W2(62));
158 R2(b, c, d, a, f, g, h, e, K[59], W1(59), W2(63));
159 R2(a, b, c, d, e, f, g, h, K[60], W1(60), W2(64));
160 R2(d, a, b, c, h, e, f, g, K[61], W1(61), W2(65));
161 R2(c, d, a, b, g, h, e, f, K[62], W1(62), W2(66));
162 R2(b, c, d, a, f, g, h, e, K[63], W1(63), W2(67));
163
164 state->h[0] ^= a;
165 state->h[1] ^= b;
166 state->h[2] ^= c;
167 state->h[3] ^= d;
168 state->h[4] ^= e;
169 state->h[5] ^= f;
170 state->h[6] ^= g;
171 state->h[7] ^= h;
172}
173#undef R
174#undef R1
175#undef R2
176#undef I
177#undef W1
178#undef W2
179
180static void __maybe_unused sm3_blocks_generic(struct sm3_block_state *state,
181 const u8 *data, size_t nblocks)
182{
183 u32 W[16];
184
185 do {
186 sm3_block_generic(state, data, W);
187 data += SM3_BLOCK_SIZE;
188 } while (--nblocks);
189
190 memzero_explicit(W, sizeof(W));
191}
192
193#ifdef CONFIG_CRYPTO_LIB_SM3_ARCH
194#include "sm3.h" /* $(SRCARCH)/sm3.h */
195#else
196#define sm3_blocks sm3_blocks_generic
197#endif
198
199void sm3_init(struct sm3_ctx *ctx)
200{
201 ctx->state = sm3_iv;
202 ctx->bytecount = 0;
203}
204EXPORT_SYMBOL_GPL(sm3_init);
205
206void sm3_update(struct sm3_ctx *ctx, const u8 *data, size_t len)
207{
208 size_t partial = ctx->bytecount % SM3_BLOCK_SIZE;
209
210 ctx->bytecount += len;
211
212 if (partial + len >= SM3_BLOCK_SIZE) {
213 size_t nblocks;
214
215 if (partial) {
216 size_t l = SM3_BLOCK_SIZE - partial;
217
218 memcpy(&ctx->buf[partial], data, l);
219 data += l;
220 len -= l;
221
222 sm3_blocks(&ctx->state, ctx->buf, 1);
223 }
224
225 nblocks = len / SM3_BLOCK_SIZE;
226 len %= SM3_BLOCK_SIZE;
227
228 if (nblocks) {
229 sm3_blocks(&ctx->state, data, nblocks);
230 data += nblocks * SM3_BLOCK_SIZE;
231 }
232 partial = 0;
233 }
234 if (len)
235 memcpy(&ctx->buf[partial], data, len);
236}
237EXPORT_SYMBOL_GPL(sm3_update);
238
239static void __sm3_final(struct sm3_ctx *ctx, u8 out[SM3_DIGEST_SIZE])
240{
241 u64 bitcount = ctx->bytecount << 3;
242 size_t partial = ctx->bytecount % SM3_BLOCK_SIZE;
243
244 ctx->buf[partial++] = 0x80;
245 if (partial > SM3_BLOCK_SIZE - 8) {
246 memset(&ctx->buf[partial], 0, SM3_BLOCK_SIZE - partial);
247 sm3_blocks(&ctx->state, ctx->buf, 1);
248 partial = 0;
249 }
250 memset(&ctx->buf[partial], 0, SM3_BLOCK_SIZE - 8 - partial);
251 *(__be64 *)&ctx->buf[SM3_BLOCK_SIZE - 8] = cpu_to_be64(bitcount);
252 sm3_blocks(&ctx->state, ctx->buf, 1);
253
254 for (size_t i = 0; i < SM3_DIGEST_SIZE; i += 4)
255 put_unaligned_be32(ctx->state.h[i / 4], out + i);
256}
257
258void sm3_final(struct sm3_ctx *ctx, u8 out[SM3_DIGEST_SIZE])
259{
260 __sm3_final(ctx, out);
261 sm3_zeroize_ctx(ctx);
262}
263EXPORT_SYMBOL_GPL(sm3_final);
264
265void sm3(const u8 *data, size_t len, u8 out[SM3_DIGEST_SIZE])
266{
267 struct sm3_ctx ctx;
268
269 sm3_init(&ctx);
270 sm3_update(&ctx, data, len);
271 sm3_final(&ctx, out);
272}
273EXPORT_SYMBOL_GPL(sm3);
274
275#ifdef sm3_mod_init_arch
276static int __init sm3_mod_init(void)
277{
278 sm3_mod_init_arch();
279 return 0;
280}
281subsys_initcall(sm3_mod_init);
282
283static void __exit sm3_mod_exit(void)
284{
285}
286module_exit(sm3_mod_exit);
287#endif
288
289MODULE_DESCRIPTION("SM3 library functions");
290MODULE_LICENSE("GPL v2");