Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / mac80211 / aes_ccm.c

diff --git a/kernel/net/mac80211/aes_ccm.c b/kernel/net/mac80211/aes_ccm.c
new file mode 100644 (file)
index 0000000..208df7c
--- /dev/null
+++ b/kernel/net/mac80211/aes_ccm.c
@@ -0,0 +1,104 @@
+/*
+ * 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/crypto.h>
+#include <linux/err.h>
+#include <crypto/aes.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 assoc, pt, ct[2];
+
+       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_one(&pt, data, data_len);
+       sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
+       sg_init_table(ct, 2);
+       sg_set_buf(&ct[0], data, data_len);
+       sg_set_buf(&ct[1], mic, mic_len);
+
+       aead_request_set_tfm(aead_req, tfm);
+       aead_request_set_assoc(aead_req, &assoc, assoc.length);
+       aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0);
+
+       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 assoc, pt, ct[2];
+       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_one(&pt, data, data_len);
+       sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
+       sg_init_table(ct, 2);
+       sg_set_buf(&ct[0], data, data_len);
+       sg_set_buf(&ct[1], mic, mic_len);
+
+       aead_request_set_tfm(aead_req, tfm);
+       aead_request_set_assoc(aead_req, &assoc, assoc.length);
+       aead_request_set_crypt(aead_req, ct, &pt, data_len + mic_len, b_0);
+
+       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);
+}