80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
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/* Orinoco MIC helpers
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*
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* See copyright notice in main.c
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/if_ether.h>
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#include <linux/scatterlist.h>
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#include <linux/crypto.h>
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#include "orinoco.h"
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#include "mic.h"
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/********************************************************************/
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/* Michael MIC crypto setup */
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/********************************************************************/
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int orinoco_mic_init(struct orinoco_private *priv)
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{
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priv->tx_tfm_mic = crypto_alloc_hash("michael_mic", 0, 0);
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if (IS_ERR(priv->tx_tfm_mic)) {
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printk(KERN_DEBUG "orinoco_mic_init: could not allocate "
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"crypto API michael_mic\n");
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priv->tx_tfm_mic = NULL;
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return -ENOMEM;
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}
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priv->rx_tfm_mic = crypto_alloc_hash("michael_mic", 0, 0);
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if (IS_ERR(priv->rx_tfm_mic)) {
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printk(KERN_DEBUG "orinoco_mic_init: could not allocate "
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"crypto API michael_mic\n");
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priv->rx_tfm_mic = NULL;
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return -ENOMEM;
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}
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return 0;
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}
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void orinoco_mic_free(struct orinoco_private *priv)
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{
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if (priv->tx_tfm_mic)
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crypto_free_hash(priv->tx_tfm_mic);
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if (priv->rx_tfm_mic)
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crypto_free_hash(priv->rx_tfm_mic);
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}
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int orinoco_mic(struct crypto_hash *tfm_michael, u8 *key,
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u8 *da, u8 *sa, u8 priority,
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u8 *data, size_t data_len, u8 *mic)
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{
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struct hash_desc desc;
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struct scatterlist sg[2];
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u8 hdr[ETH_HLEN + 2]; /* size of header + padding */
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if (tfm_michael == NULL) {
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printk(KERN_WARNING "orinoco_mic: tfm_michael == NULL\n");
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return -1;
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}
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/* Copy header into buffer. We need the padding on the end zeroed */
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memcpy(&hdr[0], da, ETH_ALEN);
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memcpy(&hdr[ETH_ALEN], sa, ETH_ALEN);
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hdr[ETH_ALEN*2] = priority;
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hdr[ETH_ALEN*2+1] = 0;
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hdr[ETH_ALEN*2+2] = 0;
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hdr[ETH_ALEN*2+3] = 0;
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/* Use scatter gather to MIC header and data in one go */
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sg_init_table(sg, 2);
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sg_set_buf(&sg[0], hdr, sizeof(hdr));
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sg_set_buf(&sg[1], data, data_len);
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if (crypto_hash_setkey(tfm_michael, key, MIC_KEYLEN))
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return -1;
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desc.tfm = tfm_michael;
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desc.flags = 0;
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return crypto_hash_digest(&desc, sg, data_len + sizeof(hdr),
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mic);
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}
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