1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * Cryptographic API 2 * Cryptographic API
4 * 3 *
5 * Michael MIC (IEEE 802.11i/TKIP) keyed diges 4 * Michael MIC (IEEE 802.11i/TKIP) keyed digest
6 * 5 *
7 * Copyright (c) 2004 Jouni Malinen <j@w1.fi> 6 * Copyright (c) 2004 Jouni Malinen <j@w1.fi>
>> 7 *
>> 8 * This program is free software; you can redistribute it and/or modify
>> 9 * it under the terms of the GNU General Public License version 2 as
>> 10 * published by the Free Software Foundation.
8 */ 11 */
9 #include <crypto/internal/hash.h> 12 #include <crypto/internal/hash.h>
10 #include <asm/unaligned.h> !! 13 #include <asm/byteorder.h>
11 #include <linux/init.h> 14 #include <linux/init.h>
12 #include <linux/module.h> 15 #include <linux/module.h>
13 #include <linux/string.h> 16 #include <linux/string.h>
14 #include <linux/types.h> 17 #include <linux/types.h>
15 18
16 19
17 struct michael_mic_ctx { 20 struct michael_mic_ctx {
18 u32 l, r; 21 u32 l, r;
19 }; 22 };
20 23
21 struct michael_mic_desc_ctx { 24 struct michael_mic_desc_ctx {
22 __le32 pending; !! 25 u8 pending[4];
23 size_t pending_len; 26 size_t pending_len;
24 27
25 u32 l, r; 28 u32 l, r;
26 }; 29 };
27 30
28 static inline u32 xswap(u32 val) 31 static inline u32 xswap(u32 val)
29 { 32 {
30 return ((val & 0x00ff00ff) << 8) | ((v 33 return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
31 } 34 }
32 35
33 36
34 #define michael_block(l, r) \ 37 #define michael_block(l, r) \
35 do { \ 38 do { \
36 r ^= rol32(l, 17); \ 39 r ^= rol32(l, 17); \
37 l += r; \ 40 l += r; \
38 r ^= xswap(l); \ 41 r ^= xswap(l); \
39 l += r; \ 42 l += r; \
40 r ^= rol32(l, 3); \ 43 r ^= rol32(l, 3); \
41 l += r; \ 44 l += r; \
42 r ^= ror32(l, 2); \ 45 r ^= ror32(l, 2); \
43 l += r; \ 46 l += r; \
44 } while (0) 47 } while (0)
45 48
46 49
47 static int michael_init(struct shash_desc *des 50 static int michael_init(struct shash_desc *desc)
48 { 51 {
49 struct michael_mic_desc_ctx *mctx = sh 52 struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
50 struct michael_mic_ctx *ctx = crypto_s 53 struct michael_mic_ctx *ctx = crypto_shash_ctx(desc->tfm);
51 mctx->pending_len = 0; 54 mctx->pending_len = 0;
52 mctx->l = ctx->l; 55 mctx->l = ctx->l;
53 mctx->r = ctx->r; 56 mctx->r = ctx->r;
54 57
55 return 0; 58 return 0;
56 } 59 }
57 60
58 61
59 static int michael_update(struct shash_desc *d 62 static int michael_update(struct shash_desc *desc, const u8 *data,
60 unsigned int len) 63 unsigned int len)
61 { 64 {
62 struct michael_mic_desc_ctx *mctx = sh 65 struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
>> 66 const __le32 *src;
63 67
64 if (mctx->pending_len) { 68 if (mctx->pending_len) {
65 int flen = 4 - mctx->pending_l 69 int flen = 4 - mctx->pending_len;
66 if (flen > len) 70 if (flen > len)
67 flen = len; 71 flen = len;
68 memcpy((u8 *)&mctx->pending + !! 72 memcpy(&mctx->pending[mctx->pending_len], data, flen);
69 mctx->pending_len += flen; 73 mctx->pending_len += flen;
70 data += flen; 74 data += flen;
71 len -= flen; 75 len -= flen;
72 76
73 if (mctx->pending_len < 4) 77 if (mctx->pending_len < 4)
74 return 0; 78 return 0;
75 79
76 mctx->l ^= le32_to_cpu(mctx->p !! 80 src = (const __le32 *)mctx->pending;
>> 81 mctx->l ^= le32_to_cpup(src);
77 michael_block(mctx->l, mctx->r 82 michael_block(mctx->l, mctx->r);
78 mctx->pending_len = 0; 83 mctx->pending_len = 0;
79 } 84 }
80 85
>> 86 src = (const __le32 *)data;
>> 87
81 while (len >= 4) { 88 while (len >= 4) {
82 mctx->l ^= get_unaligned_le32( !! 89 mctx->l ^= le32_to_cpup(src++);
83 michael_block(mctx->l, mctx->r 90 michael_block(mctx->l, mctx->r);
84 data += 4; <<
85 len -= 4; 91 len -= 4;
86 } 92 }
87 93
88 if (len > 0) { 94 if (len > 0) {
89 mctx->pending_len = len; 95 mctx->pending_len = len;
90 memcpy(&mctx->pending, data, l !! 96 memcpy(mctx->pending, src, len);
91 } 97 }
92 98
93 return 0; 99 return 0;
94 } 100 }
95 101
96 102
97 static int michael_final(struct shash_desc *de 103 static int michael_final(struct shash_desc *desc, u8 *out)
98 { 104 {
99 struct michael_mic_desc_ctx *mctx = sh 105 struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
100 u8 *data = (u8 *)&mctx->pending; !! 106 u8 *data = mctx->pending;
>> 107 __le32 *dst = (__le32 *)out;
101 108
102 /* Last block and padding (0x5a, 4..7 109 /* Last block and padding (0x5a, 4..7 x 0) */
103 switch (mctx->pending_len) { 110 switch (mctx->pending_len) {
104 case 0: 111 case 0:
105 mctx->l ^= 0x5a; 112 mctx->l ^= 0x5a;
106 break; 113 break;
107 case 1: 114 case 1:
108 mctx->l ^= data[0] | 0x5a00; 115 mctx->l ^= data[0] | 0x5a00;
109 break; 116 break;
110 case 2: 117 case 2:
111 mctx->l ^= data[0] | (data[1] 118 mctx->l ^= data[0] | (data[1] << 8) | 0x5a0000;
112 break; 119 break;
113 case 3: 120 case 3:
114 mctx->l ^= data[0] | (data[1] 121 mctx->l ^= data[0] | (data[1] << 8) | (data[2] << 16) |
115 0x5a000000; 122 0x5a000000;
116 break; 123 break;
117 } 124 }
118 michael_block(mctx->l, mctx->r); 125 michael_block(mctx->l, mctx->r);
119 /* l ^= 0; */ 126 /* l ^= 0; */
120 michael_block(mctx->l, mctx->r); 127 michael_block(mctx->l, mctx->r);
121 128
122 put_unaligned_le32(mctx->l, out); !! 129 dst[0] = cpu_to_le32(mctx->l);
123 put_unaligned_le32(mctx->r, out + 4); !! 130 dst[1] = cpu_to_le32(mctx->r);
124 131
125 return 0; 132 return 0;
126 } 133 }
127 134
128 135
129 static int michael_setkey(struct crypto_shash 136 static int michael_setkey(struct crypto_shash *tfm, const u8 *key,
130 unsigned int keylen) 137 unsigned int keylen)
131 { 138 {
132 struct michael_mic_ctx *mctx = crypto_ 139 struct michael_mic_ctx *mctx = crypto_shash_ctx(tfm);
133 140
134 if (keylen != 8) !! 141 const __le32 *data = (const __le32 *)key;
>> 142
>> 143 if (keylen != 8) {
>> 144 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
135 return -EINVAL; 145 return -EINVAL;
>> 146 }
136 147
137 mctx->l = get_unaligned_le32(key); !! 148 mctx->l = le32_to_cpu(data[0]);
138 mctx->r = get_unaligned_le32(key + 4); !! 149 mctx->r = le32_to_cpu(data[1]);
139 return 0; 150 return 0;
140 } 151 }
141 152
142 static struct shash_alg alg = { 153 static struct shash_alg alg = {
143 .digestsize = 8, 154 .digestsize = 8,
144 .setkey = michae 155 .setkey = michael_setkey,
145 .init = michae 156 .init = michael_init,
146 .update = michae 157 .update = michael_update,
147 .final = michae 158 .final = michael_final,
148 .descsize = sizeof 159 .descsize = sizeof(struct michael_mic_desc_ctx),
149 .base = { 160 .base = {
150 .cra_name = 161 .cra_name = "michael_mic",
151 .cra_driver_name = <<
152 .cra_blocksize = 162 .cra_blocksize = 8,
>> 163 .cra_alignmask = 3,
153 .cra_ctxsize = 164 .cra_ctxsize = sizeof(struct michael_mic_ctx),
154 .cra_module = 165 .cra_module = THIS_MODULE,
155 } 166 }
156 }; 167 };
157 168
158 static int __init michael_mic_init(void) 169 static int __init michael_mic_init(void)
159 { 170 {
160 return crypto_register_shash(&alg); 171 return crypto_register_shash(&alg);
161 } 172 }
162 173
163 174
164 static void __exit michael_mic_exit(void) 175 static void __exit michael_mic_exit(void)
165 { 176 {
166 crypto_unregister_shash(&alg); 177 crypto_unregister_shash(&alg);
167 } 178 }
168 179
169 180
170 subsys_initcall(michael_mic_init); !! 181 module_init(michael_mic_init);
171 module_exit(michael_mic_exit); 182 module_exit(michael_mic_exit);
172 183
173 MODULE_LICENSE("GPL v2"); 184 MODULE_LICENSE("GPL v2");
174 MODULE_DESCRIPTION("Michael MIC"); 185 MODULE_DESCRIPTION("Michael MIC");
175 MODULE_AUTHOR("Jouni Malinen <j@w1.fi>"); 186 MODULE_AUTHOR("Jouni Malinen <j@w1.fi>");
176 MODULE_ALIAS_CRYPTO("michael_mic"); 187 MODULE_ALIAS_CRYPTO("michael_mic");
177 188
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