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4adb474b DK |
1 | /* Orinoco MIC helpers |
2 | * | |
3 | * See copyright notice in main.c | |
4 | */ | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/string.h> | |
7 | #include <linux/if_ether.h> | |
8 | #include <linux/scatterlist.h> | |
9 | #include <linux/crypto.h> | |
10 | ||
11 | #include "orinoco.h" | |
12 | #include "mic.h" | |
13 | ||
14 | /********************************************************************/ | |
15 | /* Michael MIC crypto setup */ | |
16 | /********************************************************************/ | |
17 | int orinoco_mic_init(struct orinoco_private *priv) | |
18 | { | |
19 | priv->tx_tfm_mic = crypto_alloc_hash("michael_mic", 0, 0); | |
20 | if (IS_ERR(priv->tx_tfm_mic)) { | |
21 | printk(KERN_DEBUG "orinoco_mic_init: could not allocate " | |
22 | "crypto API michael_mic\n"); | |
23 | priv->tx_tfm_mic = NULL; | |
24 | return -ENOMEM; | |
25 | } | |
26 | ||
27 | priv->rx_tfm_mic = crypto_alloc_hash("michael_mic", 0, 0); | |
28 | if (IS_ERR(priv->rx_tfm_mic)) { | |
29 | printk(KERN_DEBUG "orinoco_mic_init: could not allocate " | |
30 | "crypto API michael_mic\n"); | |
31 | priv->rx_tfm_mic = NULL; | |
32 | return -ENOMEM; | |
33 | } | |
34 | ||
35 | return 0; | |
36 | } | |
37 | ||
38 | void orinoco_mic_free(struct orinoco_private *priv) | |
39 | { | |
40 | if (priv->tx_tfm_mic) | |
41 | crypto_free_hash(priv->tx_tfm_mic); | |
42 | if (priv->rx_tfm_mic) | |
43 | crypto_free_hash(priv->rx_tfm_mic); | |
44 | } | |
45 | ||
46 | int orinoco_mic(struct crypto_hash *tfm_michael, u8 *key, | |
47 | u8 *da, u8 *sa, u8 priority, | |
48 | u8 *data, size_t data_len, u8 *mic) | |
49 | { | |
50 | struct hash_desc desc; | |
51 | struct scatterlist sg[2]; | |
52 | u8 hdr[ETH_HLEN + 2]; /* size of header + padding */ | |
53 | ||
54 | if (tfm_michael == NULL) { | |
55 | printk(KERN_WARNING "orinoco_mic: tfm_michael == NULL\n"); | |
56 | return -1; | |
57 | } | |
58 | ||
59 | /* Copy header into buffer. We need the padding on the end zeroed */ | |
60 | memcpy(&hdr[0], da, ETH_ALEN); | |
61 | memcpy(&hdr[ETH_ALEN], sa, ETH_ALEN); | |
933d5943 PR |
62 | hdr[ETH_ALEN * 2] = priority; |
63 | hdr[ETH_ALEN * 2 + 1] = 0; | |
64 | hdr[ETH_ALEN * 2 + 2] = 0; | |
65 | hdr[ETH_ALEN * 2 + 3] = 0; | |
4adb474b DK |
66 | |
67 | /* Use scatter gather to MIC header and data in one go */ | |
68 | sg_init_table(sg, 2); | |
69 | sg_set_buf(&sg[0], hdr, sizeof(hdr)); | |
70 | sg_set_buf(&sg[1], data, data_len); | |
71 | ||
72 | if (crypto_hash_setkey(tfm_michael, key, MIC_KEYLEN)) | |
73 | return -1; | |
74 | ||
75 | desc.tfm = tfm_michael; | |
76 | desc.flags = 0; | |
77 | return crypto_hash_digest(&desc, sg, data_len + sizeof(hdr), | |
78 | mic); | |
79 | } |