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https://github.com/torvalds/linux
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07862e13e6
This code is written using an anti-pattern called "success handling" which makes it hard to read, especially if you are used to normal kernel style. It should instead be written as a list of directives in a row with branches for error handling. (Basically copied from Dan's previous patch for CCM) Signed-off-by: Johannes Berg <johannes.berg@intel.com>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright 2014-2015, Qualcomm Atheros, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/crypto.h>
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#include <linux/err.h>
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#include <crypto/aes.h>
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#include <net/mac80211.h>
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#include "key.h"
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#include "aes_gcm.h"
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void ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
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u8 *data, size_t data_len, u8 *mic)
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{
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struct scatterlist assoc, pt, ct[2];
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char aead_req_data[sizeof(struct aead_request) +
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crypto_aead_reqsize(tfm)]
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__aligned(__alignof__(struct aead_request));
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struct aead_request *aead_req = (void *)aead_req_data;
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memset(aead_req, 0, sizeof(aead_req_data));
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sg_init_one(&pt, data, data_len);
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sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
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sg_init_table(ct, 2);
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sg_set_buf(&ct[0], data, data_len);
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sg_set_buf(&ct[1], mic, IEEE80211_GCMP_MIC_LEN);
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_assoc(aead_req, &assoc, assoc.length);
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aead_request_set_crypt(aead_req, &pt, ct, data_len, j_0);
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crypto_aead_encrypt(aead_req);
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}
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int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
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u8 *data, size_t data_len, u8 *mic)
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{
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struct scatterlist assoc, pt, ct[2];
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char aead_req_data[sizeof(struct aead_request) +
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crypto_aead_reqsize(tfm)]
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__aligned(__alignof__(struct aead_request));
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struct aead_request *aead_req = (void *)aead_req_data;
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if (data_len == 0)
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return -EINVAL;
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memset(aead_req, 0, sizeof(aead_req_data));
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sg_init_one(&pt, data, data_len);
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sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
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sg_init_table(ct, 2);
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sg_set_buf(&ct[0], data, data_len);
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sg_set_buf(&ct[1], mic, IEEE80211_GCMP_MIC_LEN);
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_assoc(aead_req, &assoc, assoc.length);
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aead_request_set_crypt(aead_req, ct, &pt,
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data_len + IEEE80211_GCMP_MIC_LEN, j_0);
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return crypto_aead_decrypt(aead_req);
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}
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struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
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size_t key_len)
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{
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struct crypto_aead *tfm;
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int err;
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tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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return tfm;
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err = crypto_aead_setkey(tfm, key, key_len);
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if (err)
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goto free_aead;
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err = crypto_aead_setauthsize(tfm, IEEE80211_GCMP_MIC_LEN);
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if (err)
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goto free_aead;
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return tfm;
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free_aead:
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crypto_free_aead(tfm);
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return ERR_PTR(err);
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}
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void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
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{
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crypto_free_aead(tfm);
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}
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