110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
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/*
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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/err.h>
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#include <crypto/aead.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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int 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 sg[3];
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struct aead_request *aead_req;
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int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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u8 *__aad;
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aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC);
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if (!aead_req)
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return -ENOMEM;
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__aad = (u8 *)aead_req + reqsize;
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memcpy(__aad, aad, GCM_AAD_LEN);
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sg_init_table(sg, 3);
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sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
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sg_set_buf(&sg[1], data, data_len);
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sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN);
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_crypt(aead_req, sg, sg, data_len, j_0);
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aead_request_set_ad(aead_req, sg[0].length);
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crypto_aead_encrypt(aead_req);
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kzfree(aead_req);
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return 0;
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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 sg[3];
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struct aead_request *aead_req;
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int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm);
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u8 *__aad;
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int err;
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if (data_len == 0)
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return -EINVAL;
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aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC);
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if (!aead_req)
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return -ENOMEM;
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__aad = (u8 *)aead_req + reqsize;
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memcpy(__aad, aad, GCM_AAD_LEN);
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sg_init_table(sg, 3);
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sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad));
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sg_set_buf(&sg[1], data, data_len);
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sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN);
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aead_request_set_tfm(aead_req, tfm);
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aead_request_set_crypt(aead_req, sg, sg,
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data_len + IEEE80211_GCMP_MIC_LEN, j_0);
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aead_request_set_ad(aead_req, sg[0].length);
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err = crypto_aead_decrypt(aead_req);
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kzfree(aead_req);
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return err;
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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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