[PATCH] powerpc numa: Get rid of "numa domain" terminology
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / crypto / michael_mic.c
blob4f6ab23e14adfb765332394495412a25957ac28f
1 /*
2 * Cryptographic API
4 * Michael MIC (IEEE 802.11i/TKIP) keyed digest
6 * Copyright (c) 2004 Jouni Malinen <jkmaline@cc.hut.fi>
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.
13 #include <asm/byteorder.h>
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/string.h>
17 #include <linux/crypto.h>
18 #include <linux/types.h>
21 struct michael_mic_ctx {
22 u8 pending[4];
23 size_t pending_len;
25 u32 l, r;
29 static inline u32 xswap(u32 val)
31 return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
35 #define michael_block(l, r) \
36 do { \
37 r ^= rol32(l, 17); \
38 l += r; \
39 r ^= xswap(l); \
40 l += r; \
41 r ^= rol32(l, 3); \
42 l += r; \
43 r ^= ror32(l, 2); \
44 l += r; \
45 } while (0)
48 static void michael_init(void *ctx)
50 struct michael_mic_ctx *mctx = ctx;
51 mctx->pending_len = 0;
55 static void michael_update(void *ctx, const u8 *data, unsigned int len)
57 struct michael_mic_ctx *mctx = ctx;
58 const __le32 *src;
60 if (mctx->pending_len) {
61 int flen = 4 - mctx->pending_len;
62 if (flen > len)
63 flen = len;
64 memcpy(&mctx->pending[mctx->pending_len], data, flen);
65 mctx->pending_len += flen;
66 data += flen;
67 len -= flen;
69 if (mctx->pending_len < 4)
70 return;
72 src = (const __le32 *)mctx->pending;
73 mctx->l ^= le32_to_cpup(src);
74 michael_block(mctx->l, mctx->r);
75 mctx->pending_len = 0;
78 src = (const __le32 *)data;
80 while (len >= 4) {
81 mctx->l ^= le32_to_cpup(src++);
82 michael_block(mctx->l, mctx->r);
83 len -= 4;
86 if (len > 0) {
87 mctx->pending_len = len;
88 memcpy(mctx->pending, src, len);
93 static void michael_final(void *ctx, u8 *out)
95 struct michael_mic_ctx *mctx = ctx;
96 u8 *data = mctx->pending;
97 __le32 *dst = (__le32 *)out;
99 /* Last block and padding (0x5a, 4..7 x 0) */
100 switch (mctx->pending_len) {
101 case 0:
102 mctx->l ^= 0x5a;
103 break;
104 case 1:
105 mctx->l ^= data[0] | 0x5a00;
106 break;
107 case 2:
108 mctx->l ^= data[0] | (data[1] << 8) | 0x5a0000;
109 break;
110 case 3:
111 mctx->l ^= data[0] | (data[1] << 8) | (data[2] << 16) |
112 0x5a000000;
113 break;
115 michael_block(mctx->l, mctx->r);
116 /* l ^= 0; */
117 michael_block(mctx->l, mctx->r);
119 dst[0] = cpu_to_le32(mctx->l);
120 dst[1] = cpu_to_le32(mctx->r);
124 static int michael_setkey(void *ctx, const u8 *key, unsigned int keylen,
125 u32 *flags)
127 struct michael_mic_ctx *mctx = ctx;
128 const __le32 *data = (const __le32 *)key;
130 if (keylen != 8) {
131 if (flags)
132 *flags = CRYPTO_TFM_RES_BAD_KEY_LEN;
133 return -EINVAL;
136 mctx->l = le32_to_cpu(data[0]);
137 mctx->r = le32_to_cpu(data[1]);
138 return 0;
142 static struct crypto_alg michael_mic_alg = {
143 .cra_name = "michael_mic",
144 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
145 .cra_blocksize = 8,
146 .cra_ctxsize = sizeof(struct michael_mic_ctx),
147 .cra_module = THIS_MODULE,
148 .cra_list = LIST_HEAD_INIT(michael_mic_alg.cra_list),
149 .cra_u = { .digest = {
150 .dia_digestsize = 8,
151 .dia_init = michael_init,
152 .dia_update = michael_update,
153 .dia_final = michael_final,
154 .dia_setkey = michael_setkey } }
158 static int __init michael_mic_init(void)
160 return crypto_register_alg(&michael_mic_alg);
164 static void __exit michael_mic_exit(void)
166 crypto_unregister_alg(&michael_mic_alg);
170 module_init(michael_mic_init);
171 module_exit(michael_mic_exit);
173 MODULE_LICENSE("GPL v2");
174 MODULE_DESCRIPTION("Michael MIC");
175 MODULE_AUTHOR("Jouni Malinen <jkmaline@cc.hut.fi>");