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> 10 #include <crypto/algapi.h>
11 #include <crypto/sm4.h> 11 #include <crypto/sm4.h>
12 #include <linux/module.h> 12 #include <linux/module.h>
13 #include <linux/init.h> 13 #include <linux/init.h>
14 #include <linux/types.h> 14 #include <linux/types.h>
15 #include <linux/errno.h> 15 #include <linux/errno.h>
16 #include <asm/byteorder.h> 16 #include <asm/byteorder.h>
17 #include <linux/unaligned.h> !! 17 #include <asm/unaligned.h>
18 18
19 /** 19 /**
20 * sm4_setkey - Set the SM4 key. 20 * sm4_setkey - Set the SM4 key.
21 * @tfm: The %crypto_tfm that is used i 21 * @tfm: The %crypto_tfm that is used in the context.
22 * @in_key: The input key. 22 * @in_key: The input key.
23 * @key_len: The size of the key. 23 * @key_len: The size of the key.
24 * 24 *
25 * This function uses sm4_expandkey() to expan 25 * This function uses sm4_expandkey() to expand the key.
26 * &sm4_ctx _must_ be the private data embedde 26 * &sm4_ctx _must_ be the private data embedded in @tfm which is
27 * retrieved with crypto_tfm_ctx(). 27 * retrieved with crypto_tfm_ctx().
28 * 28 *
29 * Return: 0 on success; -EINVAL on failure (o 29 * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
30 */ 30 */
31 static int sm4_setkey(struct crypto_tfm *tfm, 31 static int sm4_setkey(struct crypto_tfm *tfm, const u8 *in_key,
32 unsigned int key_len) 32 unsigned int key_len)
33 { 33 {
34 struct sm4_ctx *ctx = crypto_tfm_ctx(t 34 struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
35 35
36 return sm4_expandkey(ctx, in_key, key_ 36 return sm4_expandkey(ctx, in_key, key_len);
37 } 37 }
38 38
39 /* encrypt a block of text */ 39 /* encrypt a block of text */
40 40
41 static void sm4_encrypt(struct crypto_tfm *tfm 41 static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
42 { 42 {
43 const struct sm4_ctx *ctx = crypto_tfm 43 const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
44 44
45 sm4_crypt_block(ctx->rkey_enc, out, in 45 sm4_crypt_block(ctx->rkey_enc, out, in);
46 } 46 }
47 47
48 /* decrypt a block of text */ 48 /* decrypt a block of text */
49 49
50 static void sm4_decrypt(struct crypto_tfm *tfm 50 static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
51 { 51 {
52 const struct sm4_ctx *ctx = crypto_tfm 52 const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
53 53
54 sm4_crypt_block(ctx->rkey_dec, out, in 54 sm4_crypt_block(ctx->rkey_dec, out, in);
55 } 55 }
56 56
57 static struct crypto_alg sm4_alg = { 57 static struct crypto_alg sm4_alg = {
58 .cra_name = "sm4", 58 .cra_name = "sm4",
59 .cra_driver_name = "sm4-g 59 .cra_driver_name = "sm4-generic",
60 .cra_priority = 100, 60 .cra_priority = 100,
61 .cra_flags = CRYPTO 61 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
62 .cra_blocksize = SM4_BL 62 .cra_blocksize = SM4_BLOCK_SIZE,
63 .cra_ctxsize = sizeof 63 .cra_ctxsize = sizeof(struct sm4_ctx),
64 .cra_module = THIS_M 64 .cra_module = THIS_MODULE,
65 .cra_u = { 65 .cra_u = {
66 .cipher = { 66 .cipher = {
67 .cia_min_keysize 67 .cia_min_keysize = SM4_KEY_SIZE,
68 .cia_max_keysize 68 .cia_max_keysize = SM4_KEY_SIZE,
69 .cia_setkey 69 .cia_setkey = sm4_setkey,
70 .cia_encrypt 70 .cia_encrypt = sm4_encrypt,
71 .cia_decrypt 71 .cia_decrypt = sm4_decrypt
72 } 72 }
73 } 73 }
74 }; 74 };
75 75
76 static int __init sm4_init(void) 76 static int __init sm4_init(void)
77 { 77 {
78 return crypto_register_alg(&sm4_alg); 78 return crypto_register_alg(&sm4_alg);
79 } 79 }
80 80
81 static void __exit sm4_fini(void) 81 static void __exit sm4_fini(void)
82 { 82 {
83 crypto_unregister_alg(&sm4_alg); 83 crypto_unregister_alg(&sm4_alg);
84 } 84 }
85 85
86 subsys_initcall(sm4_init); 86 subsys_initcall(sm4_init);
87 module_exit(sm4_fini); 87 module_exit(sm4_fini);
88 88
89 MODULE_DESCRIPTION("SM4 Cipher Algorithm"); 89 MODULE_DESCRIPTION("SM4 Cipher Algorithm");
90 MODULE_LICENSE("GPL v2"); 90 MODULE_LICENSE("GPL v2");
91 MODULE_ALIAS_CRYPTO("sm4"); 91 MODULE_ALIAS_CRYPTO("sm4");
92 MODULE_ALIAS_CRYPTO("sm4-generic"); 92 MODULE_ALIAS_CRYPTO("sm4-generic");
93 93
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