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