Composer on creating Laravel project giving TransportException

On running command in cmd

composer create-project --prefer-dist laravel/laravel blog

I am getting these errors -

Your version of PHP, 5.4.12, is affected by CVE-2013-6420 and cannot safely perform certificate validation, we strongly suggest you upgrade.


 [Composer\Downloader\TransportException]
 The "http://ift.tt/JZTrZY" file could not be downloaded:
 SSL operation failed with code 1. OpenSSL Error messages:
 error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
 Failed to enable crypto
 failed to open stream: operation failed


 create-project [-s|--stability STABILITY] [--prefer-source] 
 [--prefer-dist] [--repository REPOSITORY] [--repository-url           
 REPOSITORY-URL] [--dev] [--no-dev] [--no-plugins] 
 [--no-custom-installers] [--no-scripts] [--noprogress] [--keep-vcs] 
 [--no-install] [--ignore-platform-reqs] [--] [<package>] [<directory>][<version>]

Can anyone please tell me what may be the problem. I am using a proxy network. In environment variable I have set both http_proxy & https_proxy.

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