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 --- net/mac80211/aes_gcm.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 net/mac80211/aes_gcm.c (limited to 'net/mac80211/aes_gcm.c') diff --git a/net/mac80211/aes_gcm.c b/net/mac80211/aes_gcm.c new file mode 100644 index 0000000..8a4397c --- /dev/null +++ b/net/mac80211/aes_gcm.c @@ -0,0 +1,109 @@ +/* + * Copyright 2014-2015, Qualcomm Atheros, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +#include +#include "key.h" +#include "aes_gcm.h" + +int ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, + u8 *data, size_t data_len, u8 *mic) +{ + struct scatterlist sg[3]; + struct aead_request *aead_req; + int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); + u8 *__aad; + + aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC); + if (!aead_req) + return -ENOMEM; + + __aad = (u8 *)aead_req + reqsize; + memcpy(__aad, aad, GCM_AAD_LEN); + + sg_init_table(sg, 3); + sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad)); + sg_set_buf(&sg[1], data, data_len); + sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); + + aead_request_set_tfm(aead_req, tfm); + aead_request_set_crypt(aead_req, sg, sg, data_len, j_0); + aead_request_set_ad(aead_req, sg[0].length); + + crypto_aead_encrypt(aead_req); + kzfree(aead_req); + return 0; +} + +int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad, + u8 *data, size_t data_len, u8 *mic) +{ + struct scatterlist sg[3]; + struct aead_request *aead_req; + int reqsize = sizeof(*aead_req) + crypto_aead_reqsize(tfm); + u8 *__aad; + int err; + + if (data_len == 0) + return -EINVAL; + + aead_req = kzalloc(reqsize + GCM_AAD_LEN, GFP_ATOMIC); + if (!aead_req) + return -ENOMEM; + + __aad = (u8 *)aead_req + reqsize; + memcpy(__aad, aad, GCM_AAD_LEN); + + sg_init_table(sg, 3); + sg_set_buf(&sg[0], &__aad[2], be16_to_cpup((__be16 *)__aad)); + sg_set_buf(&sg[1], data, data_len); + sg_set_buf(&sg[2], mic, IEEE80211_GCMP_MIC_LEN); + + aead_request_set_tfm(aead_req, tfm); + aead_request_set_crypt(aead_req, sg, sg, + data_len + IEEE80211_GCMP_MIC_LEN, j_0); + aead_request_set_ad(aead_req, sg[0].length); + + err = crypto_aead_decrypt(aead_req); + kzfree(aead_req); + + return err; +} + +struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], + size_t key_len) +{ + struct crypto_aead *tfm; + int err; + + tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC); + if (IS_ERR(tfm)) + return tfm; + + err = crypto_aead_setkey(tfm, key, key_len); + if (err) + goto free_aead; + err = crypto_aead_setauthsize(tfm, IEEE80211_GCMP_MIC_LEN); + if (err) + goto free_aead; + + return tfm; + +free_aead: + crypto_free_aead(tfm); + return ERR_PTR(err); +} + +void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm) +{ + crypto_free_aead(tfm); +} -- cgit v1.2.3