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2022-10-23 23:45:43 -07:00
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+/*************************************************************************************************/
+/*!
+ *  \file
+ *
+ *  \brief  Security ECC implementation using uECC.
+ *
+ *  Copyright (c) 2010-2018 Arm Ltd.
+ *
+ *  Copyright (c) 2019 Packetcraft, Inc.
+ *
+ *  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 <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include "wsf_types.h"
+#include "wsf_queue.h"
+#include "wsf_msg.h"
+#include "wsf_trace.h"
+#include "sec_api.h"
+#include "sec_main.h"
+#include "wsf_buf.h"
+#include "hci_api.h"
+#include "util/calc128.h"
+#include "uECC.h"
+
+#ifndef SEC_ECC_CFG
+#define SEC_ECC_CFG SEC_ECC_CFG_UECC
+#endif
+
+#if SEC_ECC_CFG == SEC_ECC_CFG_UECC
+
+/**************************************************************************************************
+  External Variables
+**************************************************************************************************/
+
+extern secCb_t secCb;
+
+/*************************************************************************************************/
+/*!
+ *  \brief  Random number generator used by uECC.
+ *
+ *  \param  p_dest      Buffer to hold random number
+ *  \param  p_size      Size of p_dest in bytes .
+ *
+ *  \return TRUE if successful.
+ */
+/*************************************************************************************************/
+static int secEccRng(uint8_t *p_dest, unsigned p_size)
+{
+  SecRand(p_dest, p_size);
+  return TRUE;
+}
+
+/*************************************************************************************************/
+/*!
+ *  \brief  Callback for HCI encryption for ECC operations.
+ *
+ *  \param  pBuf        Pointer to sec queue element.
+ *  \param  pEvent      Pointer to HCI event.
+ *  \param  handlerId   WSF handler ID.
+ *
+ *  \return none.
+ */
+/*************************************************************************************************/
+void SecEccHciCback(secQueueBuf_t *pBuf, hciEvt_t *pEvent, wsfHandlerId_t handlerId)
+{
+  /* TBD */
+}
+
+/*************************************************************************************************/
+/*!
+ *  \brief  Generate an ECC key.
+ *
+ *  \param  handlerId   WSF handler ID for client.
+ *  \param  param       Optional parameter sent to client's WSF handler.
+ *  \param  event       Event for client's WSF handler.
+ *
+ *  \return TRUE if successful, else FALSE.
+ */
+/*************************************************************************************************/
+bool_t SecEccGenKey(wsfHandlerId_t handlerId, uint16_t param, uint8_t event)
+{
+  secEccMsg_t *pMsg = WsfMsgAlloc(sizeof(secEccMsg_t));
+
+  if (pMsg)
+  {
+    /* Generate the keys */
+    uECC_make_key(pMsg->data.key.pubKey_x, pMsg->data.key.privKey);
+
+    /* Send shared secret to handler */
+    pMsg->hdr.event = event;
+    pMsg->hdr.param = param;
+    pMsg->hdr.status = HCI_SUCCESS;
+    WsfMsgSend(handlerId, pMsg);
+
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+/*************************************************************************************************/
+/*!
+ *  \brief  Generate an ECC key.
+ *
+ *  \param  pKey        ECC Key structure.
+ *  \param  handlerId   WSF handler ID for client.
+ *  \param  param       Optional parameter sent to client's WSF handler.
+ *  \param  event       Event for client's WSF handler.
+ *
+ *  \return TRUE if successful, else FALSE.
+ */
+/*************************************************************************************************/
+bool_t SecEccGenSharedSecret(secEccKey_t *pKey, wsfHandlerId_t handlerId, uint16_t param, uint8_t event)
+{
+  secEccMsg_t *pMsg = WsfMsgAlloc(sizeof(secEccMsg_t));
+
+  if (pMsg)
+  {
+    bool_t keyValid = uECC_valid_public_key(pKey->pubKey_x);
+
+    if (keyValid)
+    {
+      uECC_shared_secret(pKey->pubKey_x, pKey->privKey, pMsg->data.sharedSecret.secret);
+    }
+    else
+    {
+      memset(pMsg->data.sharedSecret.secret, 0xFF, SEC_ECC_KEY_LEN);
+    }
+
+    /* Send shared secret to handler. */
+    pMsg->hdr.event = event;
+    pMsg->hdr.param = param;
+    pMsg->hdr.status = keyValid ? HCI_SUCCESS : HCI_ERR_INVALID_PARAM;
+    WsfMsgSend(handlerId, pMsg);
+
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+/*************************************************************************************************/
+/*!
+ *  \brief  Called to initialize ECC security.
+ *
+ *  \param  None.
+ *
+ *  \return None.
+ */
+/*************************************************************************************************/
+void SecEccInit()
+{
+  //srand((unsigned int)time(NULL));
+  uECC_set_rng(secEccRng);
+}
+
+#endif /* SEC_ECC_CFG */