MME2 changes - Propped commits from openmme/paging branch. Added scripts
for code gen
Change-Id: Ie55032217232214ac8544ca76ea34335205329e4
diff --git a/src/mme-app/sec/secUtils.cpp b/src/mme-app/sec/secUtils.cpp
new file mode 100644
index 0000000..b6a971b
--- /dev/null
+++ b/src/mme-app/sec/secUtils.cpp
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2003-2018, Great Software Laboratory Pvt. Ltd.
+ * Copyright (c) 2017 Intel Corporation
+ * Copyright (c) 2019, Infosys Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <string.h>
+#include <stdint.h>
+
+#include <openssl/x509.h>
+#include <openssl/hmac.h>
+
+#include "sec.h"
+#include "secUtils.h"
+
+/**
+ * @brief Create integrity key
+ * @param[in] kasme key
+ * @param[out] int_key generated integrity key
+ * @return void
+ */
+void SecUtils::create_integrity_key(unsigned char *kasme, unsigned char *int_key)
+{
+ /*TODO : Handle appropriate security values in salt. Remove
+ * hardcoding*/
+ uint8_t salt[HASH_SALT_LEN] = {
+ 0x15,
+ 0x02, /*sec algo code*/
+ 0,
+ 1,
+ 1,
+ 0,
+ 1
+ };
+
+ unsigned char out_key[HMAC_SIZE] = {0};
+ unsigned int out_len = 0;
+ calculate_hmac_sha256(salt, HASH_SALT_LEN, kasme, AIA_KASME_SIZE, out_key, &out_len);
+
+ memcpy(int_key, &out_key[AIA_KASME_SIZE - NAS_INT_KEY_SIZE],
+ NAS_INT_KEY_SIZE);
+}
+
+/**
+ * @brief Create eNodeB key to exchange in init ctx message
+ * @param [in]kasme key
+ * @param [out]kenb_key output the generated key
+ * @return void
+ */
+void SecUtils::create_kenb_key(unsigned char *kasme, unsigned char *kenb_key,
+ unsigned int seq_no)
+{
+ uint8_t salt[HASH_SALT_LEN] = {
+ 0x11, /*TODO : Sec algo. handle properly instead of harcoding here*/
+ (seq_no >> 24) & 0xFF, /*Byte 1 of seq no*/
+ (seq_no >> 16) & 0xFF, /*Byte 2 of seq no*/
+ (seq_no >> 8 ) & 0xFF, /*Byte 3 of seq no*/
+ (seq_no ) & 0xFF, /*Byte 4 of seq no*/
+ 0x00,
+ 0x04
+ };
+
+ uint8_t out_key[HMAC_SIZE];
+ unsigned int out_len = 0;
+ calculate_hmac_sha256(salt, HASH_SALT_LEN, kasme, AIA_KASME_SIZE, out_key, &out_len);
+ memcpy(kenb_key, out_key, KENB_SIZE);
+
+}
+
+
+/**
+* @brief Create MAC(message authentication code)
+* @param [in]input data and key
+* @param [out]output MAC, out_len size of MAC
+* @return void
+*/
+
+
+void SecUtils::calculate_hmac_sha256(const unsigned char *input_data,
+ int input_data_len, const unsigned char *key,
+ int key_length, void *output, unsigned int *out_len)
+{
+
+ unsigned int mac_length = 0;
+ unsigned char mac_buffer[EVP_MAX_MD_SIZE] = {0};
+ HMAC(EVP_sha256(), key, key_length, input_data, input_data_len, mac_buffer, &mac_length);
+ memcpy(output, mac_buffer, mac_length);
+ *out_len = mac_length;
+
+}