SMPKeyBin (C++/Java): Add 'apply(BTDevice&)' method, setting Security params and uploading available LTKs

Moving the SMPKeyBin setup and key-upload for the BTDevice to public SMPKeyBin,
providing the proper setup and upload method.

One change compared to removed coding in Scanner10 example occured:

"BTSecurityLevel::ENC_ONLY is set to avoid a new SMP PairingMode negotiation,
which is undesired as this instances' stored LTK shall be used for PairingMode::PRE_PAIRED."

i.e.: 'device.setConnSecurity(BTSecurityLevel.ENC_ONLY, SMPIOCapability.NO_INPUT_NO_OUTPUT);'

This has been evaluate with a Secure Connections capable LE device
using BTSecurityLevel::ENC_AUTH_FIPS and SMPIOCapability::KEYBOARD_ONLY.

After initial pairing using a dynamic generated passkey,
we connected successfully and stored the LTKs and CSRKs with this connection parameter.
Thereafter reconnect after setting (BTSecurityLevel.ENC_ONLY, SMPIOCapability.NO_INPUT_NO_OUTPUT)
and uploading stored keys succeeded with Linux Kernel-BlueZ host implementation.

1 files changed, 49 insertions, 0 deletions

diff --git a/src/direct_bt/SMPKeyBin.cpp b/src/direct_bt/SMPKeyBin.cpp
index a726e118..03d837eb 100644
--- a/src/direct_bt/SMPKeyBin.cpp
+++ b/src/direct_bt/SMPKeyBin.cpp
@@ -198,3 +198,52 @@ bool SMPKeyBin::read(const std::string path, const std::string basename) {
     }
     return isValid();
 }
+
+HCIStatusCode SMPKeyBin::apply(BTDevice & device) const noexcept {
+    HCIStatusCode res = HCIStatusCode::SUCCESS;
+
+    if( !isValid() || ( !hasLTKInit() && !hasLTKResp() ) ) {
+        res = HCIStatusCode::INVALID_PARAMS;
+        if( verbose ) {
+            fprintf(stderr, "****** APPLY SMPKeyBin failed: SMPKeyBin Status: %s, %s\n",
+                    getHCIStatusCodeString(res).c_str(), this->toString().c_str());
+        }
+        return res;
+    }
+    if( !device.isValid() ) {
+        res = HCIStatusCode::INVALID_PARAMS;
+        if( verbose ) {
+            fprintf(stderr, "****** APPLY SMPKeyBin failed: Device Invalid: %s, %s, %s\n",
+                    getHCIStatusCodeString(res).c_str(), this->toString().c_str(), device.toString().c_str());
+        }
+        return res;
+    }
+
+    if( !device.setConnSecurity(BTSecurityLevel::ENC_ONLY, SMPIOCapability::NO_INPUT_NO_OUTPUT) ) {
+        res = HCIStatusCode::CONNECTION_ALREADY_EXISTS;
+        if( verbose ) {
+            fprintf(stderr, "****** APPLY SMPKeyBin failed: Device Connected/ing: %s, %s, %s\n",
+                    getHCIStatusCodeString(res).c_str(), this->toString().c_str(), device.toString().c_str());
+        }
+        return res;
+    }
+
+    if( hasLTKInit() ) {
+        res = device.setLongTermKeyInfo( getLTKInit() );
+        if( HCIStatusCode::SUCCESS != res && verbose ) {
+            fprintf(stderr, "****** APPLY SMPKeyBin failed: Init-LTK Upload: %s, %s, %s\n",
+                    getHCIStatusCodeString(res).c_str(), this->toString().c_str(), device.toString().c_str());
+        }
+    }
+
+    if( HCIStatusCode::SUCCESS == res && hasLTKResp() ) {
+        res = device.setLongTermKeyInfo( getLTKResp() );
+        if( HCIStatusCode::SUCCESS != res && verbose ) {
+            fprintf(stderr, "****** APPLY SMPKeyBin failed: Resp-LTK Upload: %s, %s, %s\n",
+                    getHCIStatusCodeString(res).c_str(), this->toString().c_str(), device.toString().c_str());
+        }
+    }
+
+    return res;
+}
+