Added the ability to verify peer in SSL/TLS using given CA
certificates.
The CA certificates are specified in --ca-certificate option.
By default, the verification is disabled. Use --check-certificate
option to enable it.
* src/HttpRequestCommand.cc
* src/LibgnutlsTLSContext.cc
* src/LibgnutlsTLSContext.h
* src/LibsslTLSContext.cc
* src/LibsslTLSContext.h
* src/MultiUrlRequestInfo.cc
* src/OptionHandlerFactory.cc
* src/SocketCore.cc
* src/SocketCore.h
* src/a2functional.h
* src/message.h
* src/option_processing.cc
* src/prefs.cc
* src/prefs.h
* src/usage_text.h
Introduced TLSContext that holds TLS related data that can be
shared with multiple SSL connections.
* src/DownloadEngineFactory.cc
* src/LibgnutlsTLSContext.cc
* src/LibgnutlsTLSContext.h
* src/LibsslTLSContext.cc
* src/LibsslTLSContext.h
* src/Makefile.am
* src/SocketCore.cc
* src/SocketCore.h
* src/TLSContext.h
* src/message.h
Tatsuhiro Tsujikawa