93 lines
2.2 KiB
C
93 lines
2.2 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 <crypto/hash.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_shash("michael_mic", 0,
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CRYPTO_ALG_ASYNC);
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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_shash("michael_mic", 0,
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CRYPTO_ALG_ASYNC);
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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_shash(priv->tx_tfm_mic);
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if (priv->rx_tfm_mic)
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crypto_free_shash(priv->rx_tfm_mic);
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}
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int orinoco_mic(struct crypto_shash *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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SHASH_DESC_ON_STACK(desc, tfm_michael);
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u8 hdr[ETH_HLEN + 2]; /* size of header + padding */
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int err;
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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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desc->tfm = tfm_michael;
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desc->flags = 0;
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err = crypto_shash_setkey(tfm_michael, key, MIC_KEYLEN);
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if (err)
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return err;
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err = crypto_shash_init(desc);
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if (err)
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return err;
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err = crypto_shash_update(desc, hdr, sizeof(hdr));
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if (err)
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return err;
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err = crypto_shash_update(desc, data, data_len);
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if (err)
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return err;
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err = crypto_shash_final(desc, mic);
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shash_desc_zero(desc);
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return err;
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}
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