diff --git a/certs/ca-key.pem b/certs/ca-key.pem
new file mode 100644
index 0000000..3ea9731
--- /dev/null
+++ b/certs/ca-key.pem
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/certs/ca.csr b/certs/ca.csr
new file mode 100644
index 0000000..0100ae6
--- /dev/null
+++ b/certs/ca.csr
@@ -0,0 +1,16 @@
+-----BEGIN CERTIFICATE REQUEST-----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-----END CERTIFICATE REQUEST-----
diff --git a/certs/ca.json b/certs/ca.json
new file mode 100644
index 0000000..61f67e9
--- /dev/null
+++ b/certs/ca.json
@@ -0,0 +1,15 @@
+{
+  "CN": "nats",
+  "key": {
+    "algo": "rsa",
+    "size": 2048
+  },
+  "names": [
+    {
+      "C": "US",
+      "L": "San Diego",
+      "O": "nats",
+      "ST": "California"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/certs/ca.pem b/certs/ca.pem
new file mode 100644
index 0000000..4ee4c96
--- /dev/null
+++ b/certs/ca.pem
@@ -0,0 +1,21 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/certs/config.json b/certs/config.json
new file mode 100644
index 0000000..f4ea147
--- /dev/null
+++ b/certs/config.json
@@ -0,0 +1,18 @@
+{
+  "signing": {
+    "default": {
+      "expiry": "43800h"
+    },
+    "profiles": {   
+      "server": {
+        "expiry": "43800h",
+        "usages": [
+          "signing",
+          "digital signing",
+          "key encipherment",
+          "server auth"
+        ]
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/certs/server-key.pem b/certs/server-key.pem
new file mode 100644
index 0000000..0cb2f69
--- /dev/null
+++ b/certs/server-key.pem
@@ -0,0 +1,5 @@
+-----BEGIN EC PRIVATE KEY-----
+MHcCAQEEIIkrP8cig7mW3Z5qF8chGT99r2Rb7ORk7fQKWxYVfEU0oAoGCCqGSM49
+AwEHoUQDQgAE8LlUBCS4ghLkvzPrBEZWcug99fpb1K6D4waV2fYpQ1OVuKx7vi1K
+e43f0lV8VcjvRB7E3J9sDveZ9qZidmycDw==
+-----END EC PRIVATE KEY-----
diff --git a/certs/server.csr b/certs/server.csr
new file mode 100644
index 0000000..d365db6
--- /dev/null
+++ b/certs/server.csr
@@ -0,0 +1,7 @@
+-----BEGIN CERTIFICATE REQUEST-----
+MIHtMIGVAgEAMBExDzANBgNVBAMTBlNlcnZlcjBZMBMGByqGSM49AgEGCCqGSM49
+AwEHA0IABPC5VAQkuIIS5L8z6wRGVnLoPfX6W9Sug+MGldn2KUNTlbise74tSnuN
+39JVfFXI70QexNyfbA73mfamYnZsnA+gIjAgBgkqhkiG9w0BCQ4xEzARMA8GA1Ud
+EQQIMAaHBH8AAAEwCgYIKoZIzj0EAwIDRwAwRAIgQKiuZ/jQ9/w7z6nd9ychy9J8
+d7wva8+STodsWbPc65ECIE+O67914O5crAid2iwLaVRIprxojlglG56zkX9O+Mz9
+-----END CERTIFICATE REQUEST-----
diff --git a/certs/server.json b/certs/server.json
new file mode 100644
index 0000000..82b798c
--- /dev/null
+++ b/certs/server.json
@@ -0,0 +1,6 @@
+{
+  "CN": "Server",
+  "hosts": [
+    "127.0.0.1"
+  ]
+}
\ No newline at end of file
diff --git a/certs/server.pem b/certs/server.pem
new file mode 100644
index 0000000..2505d2c
--- /dev/null
+++ b/certs/server.pem
@@ -0,0 +1,17 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/spec/nats/tls_spec.cr b/spec/nats/tls_spec.cr
index 8d89be6..d28c9cd 100644
--- a/spec/nats/tls_spec.cr
+++ b/spec/nats/tls_spec.cr
@@ -1,7 +1,14 @@
 require "../spec_helper"
 
 describe "NATS::Connection#TLS" do
+  folders = __DIR__.split("/")
+  cert_dir = "#{folders[0...-2].join("/")}/certs"
+
   tls_uri = "tls://demo.nats.io"
+  tls_with_cert_uri = "tls://127.0.0.1:4322"
+  tls_ca_cert = "#{cert_dir}/ca.pem"
+  tls_cert = "#{cert_dir}/server.pem"
+  tls_key = "#{cert_dir}/server-key.pem"
 
   describe "#new" do
     it "should connect to a TLS based server" do
@@ -9,6 +16,21 @@ describe "NATS::Connection#TLS" do
       nc.should_not be_nil
       nc.close
     end
+
+    it "should connect to a TLS based server with tls config" do
+      uri = URI.parse(tls_with_cert_uri)
+      server = NATSServer.new(uri, "--tls --tlscert=#{tls_cert} --tlskey=#{tls_key}")
+      server.start(false)
+      server.wait_for_server(uri)
+
+      nc = NATS::Connection.new(tls_with_cert_uri, tls_config: {"ca" => tls_ca_cert, "key" => tls_key, "cert" => tls_cert})
+      nc.should_not be_nil
+      nc.close
+
+      server.try(&.shutdown)
+      sleep(20.millisecond)
+      server = nil
+    end
   end
 
   describe "#subscribe" do
diff --git a/src/nats/connection.cr b/src/nats/connection.cr
index 9b2541b..f9d962f 100644
--- a/src/nats/connection.cr
+++ b/src/nats/connection.cr
@@ -47,6 +47,7 @@ module NATS
     # ```
     # nc = NATS::Connection.new("demo.nats.io")
     # nc = NATS::Connection.new("tls://demo.nats.io")
+    # nc = NATS::Connection.new("tls://demo.nats.io", tls_config: {"ca" => "ca.pem", "key" => "cert.key", "cert" => "cert.pem"})
     # nc = NATS::Connection.new("nats://#{user}:#{pass}@127.0.0.1:4222")
     # nc = NATS::Connection.new(4222, name: "Sample App", user: "derek", pass: "s3cr3t")
     # nc = NATS::Connection.new(4222)
@@ -58,7 +59,8 @@ module NATS
       @pass : String? = nil,
       @name : String? = nil,
       @echo = true,
-      @pedantic = false
+      @pedantic = false,
+      @tls_config : Hash(String, String)? = nil
     )
       # For new style INBOX behavior.
       @nuid = NUID.new
@@ -523,9 +525,12 @@ module NATS
         raise "INFO not valid"
       end
 
-      # FIXME(dlc) - client side certs, etc.
       tls_required = @server_info["tls_required"].as_bool rescue false
-      @socket = OpenSSL::SSL::Socket::Client.new(@socket) if tls_required
+      if tls_required
+        context = @tls_config.nil? ? OpenSSL::SSL::Context::Client.new : OpenSSL::SSL::Context::Client.from_hash(@tls_config.as(Hash(String, String)))
+
+        @socket = OpenSSL::SSL::Socket::Client.new(@socket, context)
+      end
     end
 
     private def send_connect