1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 2
3 /* 3 /*
4 * SM4 Cipher Algorithm. 4 * SM4 Cipher Algorithm.
5 * 5 *
6 * Copyright (C) 2018 ARM Limited or its affil 6 * Copyright (C) 2018 ARM Limited or its affiliates.
7 * All rights reserved. 7 * All rights reserved.
8 */ 8 */
9 9
10 #include <crypto/algapi.h> <<
11 #include <crypto/sm4.h> 10 #include <crypto/sm4.h>
12 #include <linux/module.h> 11 #include <linux/module.h>
13 #include <linux/init.h> 12 #include <linux/init.h>
14 #include <linux/types.h> 13 #include <linux/types.h>
15 #include <linux/errno.h> 14 #include <linux/errno.h>
>> 15 #include <linux/crypto.h>
16 #include <asm/byteorder.h> 16 #include <asm/byteorder.h>
17 #include <linux/unaligned.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);
18 144
19 /** 145 /**
20 * sm4_setkey - Set the SM4 key. !! 146 * crypto_sm4_set_key - Set the SM4 key.
21 * @tfm: The %crypto_tfm that is used i 147 * @tfm: The %crypto_tfm that is used in the context.
22 * @in_key: The input key. 148 * @in_key: The input key.
23 * @key_len: The size of the key. 149 * @key_len: The size of the key.
24 * 150 *
25 * This function uses sm4_expandkey() to expan !! 151 * This function uses crypto_sm4_expand_key() to expand the key.
26 * &sm4_ctx _must_ be the private data embedde !! 152 * &crypto_sm4_ctx _must_ be the private data embedded in @tfm which is
27 * retrieved with crypto_tfm_ctx(). 153 * retrieved with crypto_tfm_ctx().
28 * 154 *
29 * Return: 0 on success; -EINVAL on failure (o 155 * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
30 */ 156 */
31 static int sm4_setkey(struct crypto_tfm *tfm, !! 157 int crypto_sm4_set_key(struct crypto_tfm *tfm, const u8 *in_key,
32 unsigned int key_len) 158 unsigned int key_len)
33 { 159 {
34 struct sm4_ctx *ctx = crypto_tfm_ctx(t !! 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 }
35 180
36 return sm4_expandkey(ctx, in_key, key_ !! 181 for (i = 0; i < 4; ++i)
>> 182 put_unaligned_be32(x[3 - i], &out[i]);
37 } 183 }
38 184
39 /* encrypt a block of text */ 185 /* encrypt a block of text */
40 186
41 static void sm4_encrypt(struct crypto_tfm *tfm !! 187 void crypto_sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
42 { 188 {
43 const struct sm4_ctx *ctx = crypto_tfm !! 189 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
44 190
45 sm4_crypt_block(ctx->rkey_enc, out, in !! 191 sm4_do_crypt(ctx->rkey_enc, (u32 *)out, (u32 *)in);
46 } 192 }
>> 193 EXPORT_SYMBOL_GPL(crypto_sm4_encrypt);
47 194
48 /* decrypt a block of text */ 195 /* decrypt a block of text */
49 196
50 static void sm4_decrypt(struct crypto_tfm *tfm !! 197 void crypto_sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
51 { 198 {
52 const struct sm4_ctx *ctx = crypto_tfm !! 199 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
53 200
54 sm4_crypt_block(ctx->rkey_dec, out, in !! 201 sm4_do_crypt(ctx->rkey_dec, (u32 *)out, (u32 *)in);
55 } 202 }
>> 203 EXPORT_SYMBOL_GPL(crypto_sm4_decrypt);
56 204
57 static struct crypto_alg sm4_alg = { 205 static struct crypto_alg sm4_alg = {
58 .cra_name = "sm4", 206 .cra_name = "sm4",
59 .cra_driver_name = "sm4-g 207 .cra_driver_name = "sm4-generic",
60 .cra_priority = 100, 208 .cra_priority = 100,
61 .cra_flags = CRYPTO 209 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
62 .cra_blocksize = SM4_BL 210 .cra_blocksize = SM4_BLOCK_SIZE,
63 .cra_ctxsize = sizeof !! 211 .cra_ctxsize = sizeof(struct crypto_sm4_ctx),
64 .cra_module = THIS_M 212 .cra_module = THIS_MODULE,
65 .cra_u = { 213 .cra_u = {
66 .cipher = { 214 .cipher = {
67 .cia_min_keysize 215 .cia_min_keysize = SM4_KEY_SIZE,
68 .cia_max_keysize 216 .cia_max_keysize = SM4_KEY_SIZE,
69 .cia_setkey !! 217 .cia_setkey = crypto_sm4_set_key,
70 .cia_encrypt !! 218 .cia_encrypt = crypto_sm4_encrypt,
71 .cia_decrypt !! 219 .cia_decrypt = crypto_sm4_decrypt
72 } 220 }
73 } 221 }
74 }; 222 };
75 223
76 static int __init sm4_init(void) 224 static int __init sm4_init(void)
77 { 225 {
78 return crypto_register_alg(&sm4_alg); 226 return crypto_register_alg(&sm4_alg);
79 } 227 }
80 228
81 static void __exit sm4_fini(void) 229 static void __exit sm4_fini(void)
82 { 230 {
83 crypto_unregister_alg(&sm4_alg); 231 crypto_unregister_alg(&sm4_alg);
84 } 232 }
85 233
86 subsys_initcall(sm4_init); 234 subsys_initcall(sm4_init);
87 module_exit(sm4_fini); 235 module_exit(sm4_fini);
88 236
89 MODULE_DESCRIPTION("SM4 Cipher Algorithm"); 237 MODULE_DESCRIPTION("SM4 Cipher Algorithm");
90 MODULE_LICENSE("GPL v2"); 238 MODULE_LICENSE("GPL v2");
91 MODULE_ALIAS_CRYPTO("sm4"); 239 MODULE_ALIAS_CRYPTO("sm4");
92 MODULE_ALIAS_CRYPTO("sm4-generic"); 240 MODULE_ALIAS_CRYPTO("sm4-generic");
93 241
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.