scsi: target: core: Get rid of warning in compare_and_write_do_cmp()
[linux-2.6-microblaze.git] / crypto / sm4_generic.c
1 // SPDX-License-Identifier: GPL-2.0
2
3 /*
4  * SM4 Cipher Algorithm.
5  *
6  * Copyright (C) 2018 ARM Limited or its affiliates.
7  * All rights reserved.
8  */
9
10 #include <crypto/sm4.h>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/crypto.h>
16 #include <asm/byteorder.h>
17 #include <asm/unaligned.h>
18
19 static const u32 fk[4] = {
20         0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc
21 };
22
23 static const u8 sbox[256] = {
24         0xd6, 0x90, 0xe9, 0xfe, 0xcc, 0xe1, 0x3d, 0xb7,
25         0x16, 0xb6, 0x14, 0xc2, 0x28, 0xfb, 0x2c, 0x05,
26         0x2b, 0x67, 0x9a, 0x76, 0x2a, 0xbe, 0x04, 0xc3,
27         0xaa, 0x44, 0x13, 0x26, 0x49, 0x86, 0x06, 0x99,
28         0x9c, 0x42, 0x50, 0xf4, 0x91, 0xef, 0x98, 0x7a,
29         0x33, 0x54, 0x0b, 0x43, 0xed, 0xcf, 0xac, 0x62,
30         0xe4, 0xb3, 0x1c, 0xa9, 0xc9, 0x08, 0xe8, 0x95,
31         0x80, 0xdf, 0x94, 0xfa, 0x75, 0x8f, 0x3f, 0xa6,
32         0x47, 0x07, 0xa7, 0xfc, 0xf3, 0x73, 0x17, 0xba,
33         0x83, 0x59, 0x3c, 0x19, 0xe6, 0x85, 0x4f, 0xa8,
34         0x68, 0x6b, 0x81, 0xb2, 0x71, 0x64, 0xda, 0x8b,
35         0xf8, 0xeb, 0x0f, 0x4b, 0x70, 0x56, 0x9d, 0x35,
36         0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58, 0xd1, 0xa2,
37         0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, 0x87,
38         0xd4, 0x00, 0x46, 0x57, 0x9f, 0xd3, 0x27, 0x52,
39         0x4c, 0x36, 0x02, 0xe7, 0xa0, 0xc4, 0xc8, 0x9e,
40         0xea, 0xbf, 0x8a, 0xd2, 0x40, 0xc7, 0x38, 0xb5,
41         0xa3, 0xf7, 0xf2, 0xce, 0xf9, 0x61, 0x15, 0xa1,
42         0xe0, 0xae, 0x5d, 0xa4, 0x9b, 0x34, 0x1a, 0x55,
43         0xad, 0x93, 0x32, 0x30, 0xf5, 0x8c, 0xb1, 0xe3,
44         0x1d, 0xf6, 0xe2, 0x2e, 0x82, 0x66, 0xca, 0x60,
45         0xc0, 0x29, 0x23, 0xab, 0x0d, 0x53, 0x4e, 0x6f,
46         0xd5, 0xdb, 0x37, 0x45, 0xde, 0xfd, 0x8e, 0x2f,
47         0x03, 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51,
48         0x8d, 0x1b, 0xaf, 0x92, 0xbb, 0xdd, 0xbc, 0x7f,
49         0x11, 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a, 0xd8,
50         0x0a, 0xc1, 0x31, 0x88, 0xa5, 0xcd, 0x7b, 0xbd,
51         0x2d, 0x74, 0xd0, 0x12, 0xb8, 0xe5, 0xb4, 0xb0,
52         0x89, 0x69, 0x97, 0x4a, 0x0c, 0x96, 0x77, 0x7e,
53         0x65, 0xb9, 0xf1, 0x09, 0xc5, 0x6e, 0xc6, 0x84,
54         0x18, 0xf0, 0x7d, 0xec, 0x3a, 0xdc, 0x4d, 0x20,
55         0x79, 0xee, 0x5f, 0x3e, 0xd7, 0xcb, 0x39, 0x48
56 };
57
58 static const u32 ck[] = {
59         0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269,
60         0x70777e85, 0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9,
61         0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
62         0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9,
63         0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d, 0x141b2229,
64         0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299,
65         0xa0a7aeb5, 0xbcc3cad1, 0xd8dfe6ed, 0xf4fb0209,
66         0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279
67 };
68
69 static u32 sm4_t_non_lin_sub(u32 x)
70 {
71         int i;
72         u8 *b = (u8 *)&x;
73
74         for (i = 0; i < 4; ++i)
75                 b[i] = sbox[b[i]];
76
77         return x;
78 }
79
80 static u32 sm4_key_lin_sub(u32 x)
81 {
82         return x ^ rol32(x, 13) ^ rol32(x, 23);
83
84 }
85
86 static u32 sm4_enc_lin_sub(u32 x)
87 {
88         return x ^ rol32(x, 2) ^ rol32(x, 10) ^ rol32(x, 18) ^ rol32(x, 24);
89 }
90
91 static u32 sm4_key_sub(u32 x)
92 {
93         return sm4_key_lin_sub(sm4_t_non_lin_sub(x));
94 }
95
96 static u32 sm4_enc_sub(u32 x)
97 {
98         return sm4_enc_lin_sub(sm4_t_non_lin_sub(x));
99 }
100
101 static u32 sm4_round(const u32 *x, const u32 rk)
102 {
103         return x[0] ^ sm4_enc_sub(x[1] ^ x[2] ^ x[3] ^ rk);
104 }
105
106
107 /**
108  * crypto_sm4_expand_key - Expands the SM4 key as described in GB/T 32907-2016
109  * @ctx:        The location where the computed key will be stored.
110  * @in_key:     The supplied key.
111  * @key_len:    The length of the supplied key.
112  *
113  * Returns 0 on success. The function fails only if an invalid key size (or
114  * pointer) is supplied.
115  */
116 int crypto_sm4_expand_key(struct crypto_sm4_ctx *ctx, const u8 *in_key,
117                           unsigned int key_len)
118 {
119         u32 rk[4], t;
120         const u32 *key = (u32 *)in_key;
121         int i;
122
123         if (key_len != SM4_KEY_SIZE)
124                 return -EINVAL;
125
126         for (i = 0; i < 4; ++i)
127                 rk[i] = get_unaligned_be32(&key[i]) ^ fk[i];
128
129         for (i = 0; i < 32; ++i) {
130                 t = rk[0] ^ sm4_key_sub(rk[1] ^ rk[2] ^ rk[3] ^ ck[i]);
131                 ctx->rkey_enc[i] = t;
132                 rk[0] = rk[1];
133                 rk[1] = rk[2];
134                 rk[2] = rk[3];
135                 rk[3] = t;
136         }
137
138         for (i = 0; i < 32; ++i)
139                 ctx->rkey_dec[i] = ctx->rkey_enc[31 - i];
140
141         return 0;
142 }
143 EXPORT_SYMBOL_GPL(crypto_sm4_expand_key);
144
145 /**
146  * crypto_sm4_set_key - Set the SM4 key.
147  * @tfm:        The %crypto_tfm that is used in the context.
148  * @in_key:     The input key.
149  * @key_len:    The size of the key.
150  *
151  * This function uses crypto_sm4_expand_key() to expand the key.
152  * &crypto_sm4_ctx _must_ be the private data embedded in @tfm which is
153  * retrieved with crypto_tfm_ctx().
154  *
155  * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
156  */
157 int crypto_sm4_set_key(struct crypto_tfm *tfm, const u8 *in_key,
158                        unsigned int key_len)
159 {
160         struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
161
162         return crypto_sm4_expand_key(ctx, in_key, key_len);
163 }
164 EXPORT_SYMBOL_GPL(crypto_sm4_set_key);
165
166 static void sm4_do_crypt(const u32 *rk, u32 *out, const u32 *in)
167 {
168         u32 x[4], i, t;
169
170         for (i = 0; i < 4; ++i)
171                 x[i] = get_unaligned_be32(&in[i]);
172
173         for (i = 0; i < 32; ++i) {
174                 t = sm4_round(x, rk[i]);
175                 x[0] = x[1];
176                 x[1] = x[2];
177                 x[2] = x[3];
178                 x[3] = t;
179         }
180
181         for (i = 0; i < 4; ++i)
182                 put_unaligned_be32(x[3 - i], &out[i]);
183 }
184
185 /* encrypt a block of text */
186
187 void crypto_sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
188 {
189         const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
190
191         sm4_do_crypt(ctx->rkey_enc, (u32 *)out, (u32 *)in);
192 }
193 EXPORT_SYMBOL_GPL(crypto_sm4_encrypt);
194
195 /* decrypt a block of text */
196
197 void crypto_sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
198 {
199         const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
200
201         sm4_do_crypt(ctx->rkey_dec, (u32 *)out, (u32 *)in);
202 }
203 EXPORT_SYMBOL_GPL(crypto_sm4_decrypt);
204
205 static struct crypto_alg sm4_alg = {
206         .cra_name               =       "sm4",
207         .cra_driver_name        =       "sm4-generic",
208         .cra_priority           =       100,
209         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
210         .cra_blocksize          =       SM4_BLOCK_SIZE,
211         .cra_ctxsize            =       sizeof(struct crypto_sm4_ctx),
212         .cra_module             =       THIS_MODULE,
213         .cra_u                  =       {
214                 .cipher = {
215                         .cia_min_keysize        =       SM4_KEY_SIZE,
216                         .cia_max_keysize        =       SM4_KEY_SIZE,
217                         .cia_setkey             =       crypto_sm4_set_key,
218                         .cia_encrypt            =       crypto_sm4_encrypt,
219                         .cia_decrypt            =       crypto_sm4_decrypt
220                 }
221         }
222 };
223
224 static int __init sm4_init(void)
225 {
226         return crypto_register_alg(&sm4_alg);
227 }
228
229 static void __exit sm4_fini(void)
230 {
231         crypto_unregister_alg(&sm4_alg);
232 }
233
234 subsys_initcall(sm4_init);
235 module_exit(sm4_fini);
236
237 MODULE_DESCRIPTION("SM4 Cipher Algorithm");
238 MODULE_LICENSE("GPL v2");
239 MODULE_ALIAS_CRYPTO("sm4");
240 MODULE_ALIAS_CRYPTO("sm4-generic");