From 52409fae3e4b8d16b68b61902fc09075cd97b75d Mon Sep 17 00:00:00 2001 From: Dominik Sliwa Date: Sun, 2 Jul 2017 16:41:37 +0200 Subject: Backports generated from 4.11 kernel Initial commit. Signed-off-by: Dominik Sliwa --- drivers/net/wireless/intersil/orinoco/mic.c | 92 +++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 drivers/net/wireless/intersil/orinoco/mic.c (limited to 'drivers/net/wireless/intersil/orinoco/mic.c') diff --git a/drivers/net/wireless/intersil/orinoco/mic.c b/drivers/net/wireless/intersil/orinoco/mic.c new file mode 100644 index 0000000..08bc782 --- /dev/null +++ b/drivers/net/wireless/intersil/orinoco/mic.c @@ -0,0 +1,92 @@ +/* Orinoco MIC helpers + * + * See copyright notice in main.c + */ +#include +#include +#include +#include +#include + +#include "orinoco.h" +#include "mic.h" + +/********************************************************************/ +/* Michael MIC crypto setup */ +/********************************************************************/ +int orinoco_mic_init(struct orinoco_private *priv) +{ + priv->tx_tfm_mic = crypto_alloc_shash("michael_mic", 0, + CRYPTO_ALG_ASYNC); + if (IS_ERR(priv->tx_tfm_mic)) { + printk(KERN_DEBUG "orinoco_mic_init: could not allocate " + "crypto API michael_mic\n"); + priv->tx_tfm_mic = NULL; + return -ENOMEM; + } + + priv->rx_tfm_mic = crypto_alloc_shash("michael_mic", 0, + CRYPTO_ALG_ASYNC); + if (IS_ERR(priv->rx_tfm_mic)) { + printk(KERN_DEBUG "orinoco_mic_init: could not allocate " + "crypto API michael_mic\n"); + priv->rx_tfm_mic = NULL; + return -ENOMEM; + } + + return 0; +} + +void orinoco_mic_free(struct orinoco_private *priv) +{ + if (priv->tx_tfm_mic) + crypto_free_shash(priv->tx_tfm_mic); + if (priv->rx_tfm_mic) + crypto_free_shash(priv->rx_tfm_mic); +} + +int orinoco_mic(struct crypto_shash *tfm_michael, u8 *key, + u8 *da, u8 *sa, u8 priority, + u8 *data, size_t data_len, u8 *mic) +{ + SHASH_DESC_ON_STACK(desc, tfm_michael); + u8 hdr[ETH_HLEN + 2]; /* size of header + padding */ + int err; + + if (tfm_michael == NULL) { + printk(KERN_WARNING "orinoco_mic: tfm_michael == NULL\n"); + return -1; + } + + /* Copy header into buffer. We need the padding on the end zeroed */ + memcpy(&hdr[0], da, ETH_ALEN); + memcpy(&hdr[ETH_ALEN], sa, ETH_ALEN); + hdr[ETH_ALEN * 2] = priority; + hdr[ETH_ALEN * 2 + 1] = 0; + hdr[ETH_ALEN * 2 + 2] = 0; + hdr[ETH_ALEN * 2 + 3] = 0; + + desc->tfm = tfm_michael; + desc->flags = 0; + + err = crypto_shash_setkey(tfm_michael, key, MIC_KEYLEN); + if (err) + return err; + + err = crypto_shash_init(desc); + if (err) + return err; + + err = crypto_shash_update(desc, hdr, sizeof(hdr)); + if (err) + return err; + + err = crypto_shash_update(desc, data, data_len); + if (err) + return err; + + err = crypto_shash_final(desc, mic); + shash_desc_zero(desc); + + return err; +} -- cgit v1.2.3