Blame view
crypto/michael_mic.c
3.65 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 |
/* * Cryptographic API * * Michael MIC (IEEE 802.11i/TKIP) keyed digest * |
85d32e7b0 [PATCH] Update my... |
6 |
* Copyright (c) 2004 Jouni Malinen <j@w1.fi> |
1da177e4c Linux-2.6.12-rc2 |
7 8 9 10 11 |
* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ |
19e2bf146 crypto: michael_m... |
12 |
#include <crypto/internal/hash.h> |
06ace7a9b [CRYPTO] Use stan... |
13 |
#include <asm/byteorder.h> |
1da177e4c Linux-2.6.12-rc2 |
14 15 16 |
#include <linux/init.h> #include <linux/module.h> #include <linux/string.h> |
06ace7a9b [CRYPTO] Use stan... |
17 |
#include <linux/types.h> |
1da177e4c Linux-2.6.12-rc2 |
18 19 20 |
struct michael_mic_ctx { |
19e2bf146 crypto: michael_m... |
21 22 23 24 |
u32 l, r; }; struct michael_mic_desc_ctx { |
1da177e4c Linux-2.6.12-rc2 |
25 26 27 28 29 |
u8 pending[4]; size_t pending_len; u32 l, r; }; |
1da177e4c Linux-2.6.12-rc2 |
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 |
static inline u32 xswap(u32 val) { return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8); } #define michael_block(l, r) \ do { \ r ^= rol32(l, 17); \ l += r; \ r ^= xswap(l); \ l += r; \ r ^= rol32(l, 3); \ l += r; \ r ^= ror32(l, 2); \ l += r; \ } while (0) |
19e2bf146 crypto: michael_m... |
47 |
static int michael_init(struct shash_desc *desc) |
1da177e4c Linux-2.6.12-rc2 |
48 |
{ |
19e2bf146 crypto: michael_m... |
49 50 |
struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc); struct michael_mic_ctx *ctx = crypto_shash_ctx(desc->tfm); |
1da177e4c Linux-2.6.12-rc2 |
51 |
mctx->pending_len = 0; |
19e2bf146 crypto: michael_m... |
52 53 54 55 |
mctx->l = ctx->l; mctx->r = ctx->r; return 0; |
1da177e4c Linux-2.6.12-rc2 |
56 |
} |
19e2bf146 crypto: michael_m... |
57 |
static int michael_update(struct shash_desc *desc, const u8 *data, |
6c2bb98bc [CRYPTO] all: Pas... |
58 |
unsigned int len) |
1da177e4c Linux-2.6.12-rc2 |
59 |
{ |
19e2bf146 crypto: michael_m... |
60 |
struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc); |
06ace7a9b [CRYPTO] Use stan... |
61 |
const __le32 *src; |
1da177e4c Linux-2.6.12-rc2 |
62 63 64 65 66 67 68 69 70 71 72 |
if (mctx->pending_len) { int flen = 4 - mctx->pending_len; if (flen > len) flen = len; memcpy(&mctx->pending[mctx->pending_len], data, flen); mctx->pending_len += flen; data += flen; len -= flen; if (mctx->pending_len < 4) |
19e2bf146 crypto: michael_m... |
73 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
74 |
|
06ace7a9b [CRYPTO] Use stan... |
75 76 |
src = (const __le32 *)mctx->pending; mctx->l ^= le32_to_cpup(src); |
1da177e4c Linux-2.6.12-rc2 |
77 78 79 |
michael_block(mctx->l, mctx->r); mctx->pending_len = 0; } |
06ace7a9b [CRYPTO] Use stan... |
80 |
src = (const __le32 *)data; |
1da177e4c Linux-2.6.12-rc2 |
81 |
while (len >= 4) { |
06ace7a9b [CRYPTO] Use stan... |
82 |
mctx->l ^= le32_to_cpup(src++); |
1da177e4c Linux-2.6.12-rc2 |
83 |
michael_block(mctx->l, mctx->r); |
1da177e4c Linux-2.6.12-rc2 |
84 85 86 87 88 |
len -= 4; } if (len > 0) { mctx->pending_len = len; |
06ace7a9b [CRYPTO] Use stan... |
89 |
memcpy(mctx->pending, src, len); |
1da177e4c Linux-2.6.12-rc2 |
90 |
} |
19e2bf146 crypto: michael_m... |
91 92 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
93 |
} |
19e2bf146 crypto: michael_m... |
94 |
static int michael_final(struct shash_desc *desc, u8 *out) |
1da177e4c Linux-2.6.12-rc2 |
95 |
{ |
19e2bf146 crypto: michael_m... |
96 |
struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc); |
1da177e4c Linux-2.6.12-rc2 |
97 |
u8 *data = mctx->pending; |
06ace7a9b [CRYPTO] Use stan... |
98 |
__le32 *dst = (__le32 *)out; |
1da177e4c Linux-2.6.12-rc2 |
99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 |
/* Last block and padding (0x5a, 4..7 x 0) */ switch (mctx->pending_len) { case 0: mctx->l ^= 0x5a; break; case 1: mctx->l ^= data[0] | 0x5a00; break; case 2: mctx->l ^= data[0] | (data[1] << 8) | 0x5a0000; break; case 3: mctx->l ^= data[0] | (data[1] << 8) | (data[2] << 16) | 0x5a000000; break; } michael_block(mctx->l, mctx->r); /* l ^= 0; */ michael_block(mctx->l, mctx->r); |
06ace7a9b [CRYPTO] Use stan... |
119 120 |
dst[0] = cpu_to_le32(mctx->l); dst[1] = cpu_to_le32(mctx->r); |
19e2bf146 crypto: michael_m... |
121 122 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
123 |
} |
19e2bf146 crypto: michael_m... |
124 |
static int michael_setkey(struct crypto_shash *tfm, const u8 *key, |
560c06ae1 [CRYPTO] api: Get... |
125 |
unsigned int keylen) |
1da177e4c Linux-2.6.12-rc2 |
126 |
{ |
19e2bf146 crypto: michael_m... |
127 |
struct michael_mic_ctx *mctx = crypto_shash_ctx(tfm); |
06ace7a9b [CRYPTO] Use stan... |
128 |
const __le32 *data = (const __le32 *)key; |
1da177e4c Linux-2.6.12-rc2 |
129 |
if (keylen != 8) { |
19e2bf146 crypto: michael_m... |
130 |
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
1da177e4c Linux-2.6.12-rc2 |
131 132 |
return -EINVAL; } |
06ace7a9b [CRYPTO] Use stan... |
133 134 135 |
mctx->l = le32_to_cpu(data[0]); mctx->r = le32_to_cpu(data[1]); |
1da177e4c Linux-2.6.12-rc2 |
136 137 |
return 0; } |
19e2bf146 crypto: michael_m... |
138 139 140 141 142 143 144 145 146 147 148 149 150 151 |
static struct shash_alg alg = { .digestsize = 8, .setkey = michael_setkey, .init = michael_init, .update = michael_update, .final = michael_final, .descsize = sizeof(struct michael_mic_desc_ctx), .base = { .cra_name = "michael_mic", .cra_blocksize = 8, .cra_alignmask = 3, .cra_ctxsize = sizeof(struct michael_mic_ctx), .cra_module = THIS_MODULE, } |
1da177e4c Linux-2.6.12-rc2 |
152 |
}; |
1da177e4c Linux-2.6.12-rc2 |
153 154 |
static int __init michael_mic_init(void) { |
19e2bf146 crypto: michael_m... |
155 |
return crypto_register_shash(&alg); |
1da177e4c Linux-2.6.12-rc2 |
156 157 158 159 160 |
} static void __exit michael_mic_exit(void) { |
19e2bf146 crypto: michael_m... |
161 |
crypto_unregister_shash(&alg); |
1da177e4c Linux-2.6.12-rc2 |
162 163 164 165 166 167 168 169 |
} module_init(michael_mic_init); module_exit(michael_mic_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Michael MIC"); |
85d32e7b0 [PATCH] Update my... |
170 |
MODULE_AUTHOR("Jouni Malinen <j@w1.fi>"); |
5d26a105b crypto: prefix mo... |
171 |
MODULE_ALIAS_CRYPTO("michael_mic"); |