Import Mbed OS hard-float snapshot

connectivity/nanostack/sal-stack-nanostack/source/Security/TLS/tls_ccm_crypt.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2017-2018, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 "nsconfig.h"
+#include "ns_types.h"
+#ifdef PANA
+#include "ns_trace.h"
+#include "string.h"
+#include "ccmLIB.h"
+#include "ns_trace.h"
+#include "common_functions.h"
+
+#define CLIENT_WRITE_KEY    0
+#define SERVER_WRITE_KEY    16
+#define CLIENT_IV           32
+#define SERVER_IV           36
+#define TRACE_GROUP "cryp"
+#define TLS_1_2_VER                 0x0303
+
+static bool tls_ccm_init(ccm_globals_t *ccm_ptr, const uint8_t *key_expansion, const uint8_t *nonce, bool server, uint8_t crypt_process)
+{
+    const uint8_t *key, *iv_ptr;
+    if (server) {
+        key = key_expansion + SERVER_WRITE_KEY;
+        iv_ptr = key_expansion + SERVER_IV;
+    } else {
+        key = key_expansion + CLIENT_WRITE_KEY;
+        iv_ptr = key_expansion + CLIENT_IV;
+    }
+
+    if (!ccm_sec_init(ccm_ptr, AES_SECURITY_LEVEL_ENC_MIC64, key, crypt_process, 3)) {
+        return false;
+    }
+
+    memcpy(ccm_ptr->exp_nonce, iv_ptr, 4);
+    memcpy(&ccm_ptr->exp_nonce[4], nonce, 8);
+    return true;
+}
+
+
+static void tls_set_adata(ccm_globals_t *ccm_ptr, uint8_t *a_data, const uint8_t *nonce, uint8_t type)
+{
+    ccm_ptr->adata_len = 13;
+    ccm_ptr->adata_ptr = a_data;
+    memcpy(a_data, nonce, 8);
+    a_data += 8;
+    *a_data++ = type;
+    a_data = common_write_16_bit(TLS_1_2_VER, a_data);
+    common_write_16_bit(ccm_ptr->data_len, a_data);
+}
+
+
+int8_t tls_ccm_data_encrypt(uint8_t *data_ptr, uint16_t data_length, const uint8_t *key_expansion, const uint8_t *nonce, uint8_t type, bool server)
+{
+    ccm_globals_t ccm_ptr;
+    if (!tls_ccm_init(&ccm_ptr, key_expansion, nonce, server, AES_CCM_ENCRYPT)) {
+        return -1;
+    }
+    uint8_t adata[13];
+    ccm_ptr.data_len = data_length;
+    ccm_ptr.data_ptr  = data_ptr;
+    ccm_ptr.mic = (ccm_ptr.data_ptr + ccm_ptr.data_len);
+    tls_set_adata(&ccm_ptr, adata, nonce, type);
+    return ccm_process_run(&ccm_ptr);
+}
+
+int8_t tls_ccm_data_decrypt(uint8_t *data_ptr, uint16_t data_length, const uint8_t *key_expansion, uint8_t type, bool server)
+{
+
+    if (data_length <= 16) {
+        return -1;
+    }
+    ccm_globals_t ccm_ptr;
+
+    if (!tls_ccm_init(&ccm_ptr, key_expansion, data_ptr, server, AES_CCM_DECRYPT)) {
+        return -1;
+    }
+
+    uint8_t adata[13];
+    ccm_ptr.data_len = data_length - 16;
+
+    tls_set_adata(&ccm_ptr, adata, data_ptr, type);
+    ccm_ptr.data_ptr  = data_ptr + 8;
+    ccm_ptr.mic = (ccm_ptr.data_ptr + ccm_ptr.data_len);
+
+    return ccm_process_run(&ccm_ptr);
+}
+#endif