--- a/NEWS	Wed Sep 16 13:22:30 2020 +0200
+++ b/NEWS	Wed Sep 16 13:30:01 2020 +0200
@@ -5,10 +5,10 @@
 -------
 
 * New configuration options to enable HTTP peers identification through certificates:
-  "SslVerifyPeers" & "SslTrustedClientCertificates"
-* New configuration option "SyncStorageArea" to commit the files on disk "inside" the DB
-  transaction and avoid DB - File system discrepencies in case of hard shutdown 
-  of the machine running Orthanc.  This comes with a cost: DICOM file ingestion is slower.
+  "SslVerifyPeers" and "SslTrustedClientCertificates"
+* New configuration option "SyncStorageArea" to immediately commit the files onto the disk
+  (through fsync()), so as to avoid discrepencies between DB and filesystem in case of hard
+  shutdown of the machine running Orthanc. This slows down adding new files into Orthanc.
 
 Maintenance
 -----------
@@ -19,6 +19,7 @@
 * When checking DICOM allowed methods, if there are multiple modalities with the same AET, 
   differentiate them from the calling IP
 * Enable the access to raw frames in Philips ELSCINT1 proprietary compression
+* Support empty key passwords when using HTTP client certificates
 * Fix handling of "ModalitiesInStudy" (0008,0061) in C-FIND and "/tools/find"
 
 

--- a/OrthancFramework/Sources/HttpClient.cpp	Wed Sep 16 13:22:30 2020 +0200
+++ b/OrthancFramework/Sources/HttpClient.cpp	Wed Sep 16 13:30:01 2020 +0200
@@ -788,11 +788,7 @@
 #if ORTHANC_ENABLE_SSL == 1
       CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_SSLCERTTYPE, "PEM"));
       CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_SSLCERT, clientCertificateFile_.c_str()));
-
-      if (!clientCertificateKeyPassword_.empty())
-      {
-        CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_KEYPASSWD, clientCertificateKeyPassword_.c_str()));
-      }
+      CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_KEYPASSWD, clientCertificateKeyPassword_.c_str()));
 
       // NB: If no "clientKeyFile_" is provided, the key must be
       // prepended to the certificate file

--- a/OrthancServer/Resources/Configuration.json	Wed Sep 16 13:22:30 2020 +0200
+++ b/OrthancServer/Resources/Configuration.json	Wed Sep 16 13:30:01 2020 +0200
@@ -147,20 +147,21 @@
   // Whether or not SSL is enabled
   "SslEnabled" : false,
 
-  // Path to the SSL certificate used by the HTTP server.
-  // Certifcate must be stored in the PEM format.
-  // meaningful only if SslEnabled is true. 
-  // The file must contain both the certificate and the private key.
+  // Path to the SSL certificate used by the HTTP server. The file
+  // must be stored in the PEM format, and must contain both the
+  // certificate and the private key. This option is only meaningful
+  // if "SslEnabled" is true.
   "SslCertificate" : "certificate.pem",
 
-  // Whether or not peer client certificates shall be checked.
-  // meaningfull only if SslEnabled is true
+  // Whether or not peer client certificates shall be checked. This
+  // option is only meaningfull if "SslEnabled" is true.
   "SslVerifyPeers" : false,
 
-  // Path to the SSL certificate(s) that are trusted to verify
-  // peers identify. 
-  // Certifcate(s) must be stored in the PEM format.
-  // meaningfull only if SslVerifyPeers is true
+  // Path to a file containing the concatenation of the client SSL
+  // certificate(s) that are trusted to verify the identify of remote
+  // HTTP clients. The individual certificate(s) must be stored in the
+  // PEM format. This option is only meaningfull if "SslVerifyPeers"
+  // is true.
   "SslTrustedClientCertificates" : "trustedClientCertificates.pem",
   
   // Whether or not the password protection is enabled (using HTTP