1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
2 | /* |
3 | * SM4, as specified in |
4 | * https://tools.ietf.org/id/draft-ribose-cfrg-sm4-10.html |
5 | * |
6 | * Copyright (C) 2018 ARM Limited or its affiliates. |
7 | * Copyright (c) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com> |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <asm/unaligned.h> |
12 | #include <crypto/sm4.h> |
13 | |
14 | static const u32 ____cacheline_aligned fk[4] = { |
15 | 0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc |
16 | }; |
17 | |
18 | static const u32 ____cacheline_aligned ck[32] = { |
19 | 0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, |
20 | 0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9, |
21 | 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249, |
22 | 0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9, |
23 | 0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229, |
24 | 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299, |
25 | 0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209, |
26 | 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279 |
27 | }; |
28 | |
29 | static const u8 ____cacheline_aligned sbox[256] = { |
30 | 0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7, |
31 | 0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05, |
32 | 0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3, |
33 | 0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99, |
34 | 0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a, |
35 | 0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62, |
36 | 0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95, |
37 | 0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6, |
38 | 0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba, |
39 | 0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8, |
40 | 0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b, |
41 | 0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35, |
42 | 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2, |
43 | 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87, |
44 | 0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52, |
45 | 0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e, |
46 | 0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5, |
47 | 0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1, |
48 | 0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55, |
49 | 0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3, |
50 | 0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60, |
51 | 0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f, |
52 | 0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f, |
53 | 0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, |
54 | 0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f, |
55 | 0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8, |
56 | 0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd, |
57 | 0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0, |
58 | 0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e, |
59 | 0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84, |
60 | 0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20, |
61 | 0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48 |
62 | }; |
63 | |
64 | extern const u32 crypto_sm4_fk[4] __alias(fk); |
65 | extern const u32 crypto_sm4_ck[32] __alias(ck); |
66 | extern const u8 crypto_sm4_sbox[256] __alias(sbox); |
67 | |
68 | EXPORT_SYMBOL(crypto_sm4_fk); |
69 | EXPORT_SYMBOL(crypto_sm4_ck); |
70 | EXPORT_SYMBOL(crypto_sm4_sbox); |
71 | |
72 | static inline u32 sm4_t_non_lin_sub(u32 x) |
73 | { |
74 | u32 out; |
75 | |
76 | out = (u32)sbox[x & 0xff]; |
77 | out |= (u32)sbox[(x >> 8) & 0xff] << 8; |
78 | out |= (u32)sbox[(x >> 16) & 0xff] << 16; |
79 | out |= (u32)sbox[(x >> 24) & 0xff] << 24; |
80 | |
81 | return out; |
82 | } |
83 | |
84 | static inline u32 sm4_key_lin_sub(u32 x) |
85 | { |
86 | return x ^ rol32(word: x, shift: 13) ^ rol32(word: x, shift: 23); |
87 | } |
88 | |
89 | static inline u32 sm4_enc_lin_sub(u32 x) |
90 | { |
91 | return x ^ rol32(word: x, shift: 2) ^ rol32(word: x, shift: 10) ^ rol32(word: x, shift: 18) ^ rol32(word: x, shift: 24); |
92 | } |
93 | |
94 | static inline u32 sm4_key_sub(u32 x) |
95 | { |
96 | return sm4_key_lin_sub(x: sm4_t_non_lin_sub(x)); |
97 | } |
98 | |
99 | static inline u32 sm4_enc_sub(u32 x) |
100 | { |
101 | return sm4_enc_lin_sub(x: sm4_t_non_lin_sub(x)); |
102 | } |
103 | |
104 | static inline u32 sm4_round(u32 x0, u32 x1, u32 x2, u32 x3, u32 rk) |
105 | { |
106 | return x0 ^ sm4_enc_sub(x: x1 ^ x2 ^ x3 ^ rk); |
107 | } |
108 | |
109 | |
110 | /** |
111 | * sm4_expandkey - Expands the SM4 key as described in GB/T 32907-2016 |
112 | * @ctx: The location where the computed key will be stored. |
113 | * @in_key: The supplied key. |
114 | * @key_len: The length of the supplied key. |
115 | * |
116 | * Returns 0 on success. The function fails only if an invalid key size (or |
117 | * pointer) is supplied. |
118 | */ |
119 | int sm4_expandkey(struct sm4_ctx *ctx, const u8 *in_key, |
120 | unsigned int key_len) |
121 | { |
122 | u32 rk[4]; |
123 | const u32 *key = (u32 *)in_key; |
124 | int i; |
125 | |
126 | if (key_len != SM4_KEY_SIZE) |
127 | return -EINVAL; |
128 | |
129 | rk[0] = get_unaligned_be32(p: &key[0]) ^ fk[0]; |
130 | rk[1] = get_unaligned_be32(p: &key[1]) ^ fk[1]; |
131 | rk[2] = get_unaligned_be32(p: &key[2]) ^ fk[2]; |
132 | rk[3] = get_unaligned_be32(p: &key[3]) ^ fk[3]; |
133 | |
134 | for (i = 0; i < 32; i += 4) { |
135 | rk[0] ^= sm4_key_sub(x: rk[1] ^ rk[2] ^ rk[3] ^ ck[i + 0]); |
136 | rk[1] ^= sm4_key_sub(x: rk[2] ^ rk[3] ^ rk[0] ^ ck[i + 1]); |
137 | rk[2] ^= sm4_key_sub(x: rk[3] ^ rk[0] ^ rk[1] ^ ck[i + 2]); |
138 | rk[3] ^= sm4_key_sub(x: rk[0] ^ rk[1] ^ rk[2] ^ ck[i + 3]); |
139 | |
140 | ctx->rkey_enc[i + 0] = rk[0]; |
141 | ctx->rkey_enc[i + 1] = rk[1]; |
142 | ctx->rkey_enc[i + 2] = rk[2]; |
143 | ctx->rkey_enc[i + 3] = rk[3]; |
144 | ctx->rkey_dec[31 - 0 - i] = rk[0]; |
145 | ctx->rkey_dec[31 - 1 - i] = rk[1]; |
146 | ctx->rkey_dec[31 - 2 - i] = rk[2]; |
147 | ctx->rkey_dec[31 - 3 - i] = rk[3]; |
148 | } |
149 | |
150 | return 0; |
151 | } |
152 | EXPORT_SYMBOL_GPL(sm4_expandkey); |
153 | |
154 | /** |
155 | * sm4_crypt_block - Encrypt or decrypt a single SM4 block |
156 | * @rk: The rkey_enc for encrypt or rkey_dec for decrypt |
157 | * @out: Buffer to store output data |
158 | * @in: Buffer containing the input data |
159 | */ |
160 | void sm4_crypt_block(const u32 *rk, u8 *out, const u8 *in) |
161 | { |
162 | u32 x[4], i; |
163 | |
164 | x[0] = get_unaligned_be32(p: in + 0 * 4); |
165 | x[1] = get_unaligned_be32(p: in + 1 * 4); |
166 | x[2] = get_unaligned_be32(p: in + 2 * 4); |
167 | x[3] = get_unaligned_be32(p: in + 3 * 4); |
168 | |
169 | for (i = 0; i < 32; i += 4) { |
170 | x[0] = sm4_round(x0: x[0], x1: x[1], x2: x[2], x3: x[3], rk: rk[i + 0]); |
171 | x[1] = sm4_round(x0: x[1], x1: x[2], x2: x[3], x3: x[0], rk: rk[i + 1]); |
172 | x[2] = sm4_round(x0: x[2], x1: x[3], x2: x[0], x3: x[1], rk: rk[i + 2]); |
173 | x[3] = sm4_round(x0: x[3], x1: x[0], x2: x[1], x3: x[2], rk: rk[i + 3]); |
174 | } |
175 | |
176 | put_unaligned_be32(val: x[3 - 0], p: out + 0 * 4); |
177 | put_unaligned_be32(val: x[3 - 1], p: out + 1 * 4); |
178 | put_unaligned_be32(val: x[3 - 2], p: out + 2 * 4); |
179 | put_unaligned_be32(val: x[3 - 3], p: out + 3 * 4); |
180 | } |
181 | EXPORT_SYMBOL_GPL(sm4_crypt_block); |
182 | |
183 | MODULE_DESCRIPTION("Generic SM4 library" ); |
184 | MODULE_LICENSE("GPL v2" ); |
185 | |