* ext/openssl/ossl_engine.c (ossl_engine_s_by_id):

  OpenSSL::Engine.by_id calls given block before calling ENGINE_init
  (block parameter is the return value of this method itself).
  this functionality is useful to load dynamic shared engines.

        require "openssl"
        pkcs11 = OpenSSL::Engine.by_id("dynamic"){|e|
          e.ctrl_cmd("SO_PATH", "/usr/lib/opensc/engine_pkcs11.so")
          e.ctrl_cmd("LIST_ADD", "1")
          e.ctrl_cmd("LOAD")
        }
        pkcs11.ctrl_cmd("PIN", "secret")
        key = pkcs11.load_private_key

* ext/openssl/ossl_engine.c (ossl_engine_ctrl_cmd): new method
  OpenSSL::Engine#ctrl_cmd. it wraps ENGINE_ctrl_cmd_string.

* ext/openssl/ossl_engine.c (ossl_engine_get_cmds): new method
  OpenSSL::Engine#cmds. it returms engine command definitions.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9096 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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