File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/net/mac80211/aes_ccm.c b/net/mac80211/aes_ccm.c
new file mode 100644
index 0000000..7663c28
--- /dev/null
+++ b/net/mac80211/aes_ccm.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2003-2004, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ *
+ * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
+ *
+ * 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 <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <crypto/aead.h>
+
+#include <net/mac80211.h>
+#include "key.h"
+#include "aes_ccm.h"
+
+void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+ u8 *data, size_t data_len, u8 *mic,
+ size_t mic_len)
+{
+ struct scatterlist sg[3];
+
+ char aead_req_data[sizeof(struct aead_request) +
+ crypto_aead_reqsize(tfm)]
+ __aligned(__alignof__(struct aead_request));
+ struct aead_request *aead_req = (void *) aead_req_data;
+
+ memset(aead_req, 0, sizeof(aead_req_data));
+
+ 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, mic_len);
+
+ aead_request_set_tfm(aead_req, tfm);
+ aead_request_set_crypt(aead_req, sg, sg, data_len, b_0);
+ aead_request_set_ad(aead_req, sg[0].length);
+
+ crypto_aead_encrypt(aead_req);
+}
+
+int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
+ u8 *data, size_t data_len, u8 *mic,
+ size_t mic_len)
+{
+ struct scatterlist sg[3];
+ char aead_req_data[sizeof(struct aead_request) +
+ crypto_aead_reqsize(tfm)]
+ __aligned(__alignof__(struct aead_request));
+ struct aead_request *aead_req = (void *) aead_req_data;
+
+ if (data_len == 0)
+ return -EINVAL;
+
+ memset(aead_req, 0, sizeof(aead_req_data));
+
+ 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, mic_len);
+
+ aead_request_set_tfm(aead_req, tfm);
+ aead_request_set_crypt(aead_req, sg, sg, data_len + mic_len, b_0);
+ aead_request_set_ad(aead_req, sg[0].length);
+
+ return crypto_aead_decrypt(aead_req);
+}
+
+struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[],
+ size_t key_len,
+ size_t mic_len)
+{
+ struct crypto_aead *tfm;
+ int err;
+
+ tfm = crypto_alloc_aead("ccm(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, mic_len);
+ if (err)
+ goto free_aead;
+
+ return tfm;
+
+free_aead:
+ crypto_free_aead(tfm);
+ return ERR_PTR(err);
+}
+
+void ieee80211_aes_key_free(struct crypto_aead *tfm)
+{
+ crypto_free_aead(tfm);
+}