diff --git a/.classpath b/.classpath
index 94bdfe3..dcd861c 100644
--- a/.classpath
+++ b/.classpath
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<accessrules>
+			<accessrule kind="accessible" pattern="sun/misc/*"/>
+		</accessrules>
+	</classpathentry>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="lib" path="jar/jackson-annotations-2.9.7.jar"/>
 	<classpathentry kind="lib" path="jar/jackson-core-2.9.7.jar"/>
diff --git a/.settings/org.eclipse.ltk.core.refactoring.prefs b/.settings/org.eclipse.ltk.core.refactoring.prefs
new file mode 100644
index 0000000..cfcd1d3
--- /dev/null
+++ b/.settings/org.eclipse.ltk.core.refactoring.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+org.eclipse.ltk.core.refactoring.enable.project.refactoring.history=false
diff --git a/src/testcase/twitter/OAuthHeader.java b/src/testcase/twitter/OAuthHeader.java
index 092f217..15c8316 100644
--- a/src/testcase/twitter/OAuthHeader.java
+++ b/src/testcase/twitter/OAuthHeader.java
@@ -1,8 +1,18 @@
 package testcase.twitter;
 
+import java.io.UnsupportedEncodingException;
+import java.net.URLEncoder;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.util.Map.Entry;
+import java.util.SortedMap;
+import java.util.TreeMap;
+
 import javax.crypto.Mac;
 import javax.crypto.spec.SecretKeySpec;
 
+import sun.misc.BASE64Encoder;
+
 public class OAuthHeader {
 	private String consumer_key;
 	private String consumer_secret;
@@ -10,6 +20,7 @@
 	private String oauth_secret;
 	private String method = "POST";
 	private String url = "https://api.twitter.com/oauth/request_token";
+	private SortedMap<String, String> params = new TreeMap<String, String>();
 
 	public String getConsumer_key() {
 		return consumer_key;
@@ -42,8 +53,58 @@
 	public void setOauth_secret(String oauth_secret) {
 		this.oauth_secret = oauth_secret;
 	}
+	
+	public void generateSignature(){
+		String paramStr = "";
+		for (Entry<String, String> param : params.entrySet()) {
+			paramStr += "&" + param.getKey() + "=" + param.getValue();
+		}
+		paramStr = paramStr.substring(1);
 
+		// �����Ώۃe�L�X�g�isignature base string�j�̍쐬
+		String text = method + "&" + urlEncode(url) + "&"
+				+ urlEncode(paramStr);
+
+		// �����L�[�̍쐬
+		String key = urlEncode(consumer_secret) + "&"
+				+ urlEncode(oauth_secret);
+
+		// HMAC-SHA1�ŏ����𐶐�
+		SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(),
+				"HmacSHA1");
+		Mac mac = null;
+		try {
+			mac = Mac.getInstance(signingKey.getAlgorithm());
+		} catch (NoSuchAlgorithmException e1) {
+			// TODO Auto-generated catch block
+			e1.printStackTrace();
+		}
+		try {
+			mac.init(signingKey);
+		} catch (InvalidKeyException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		byte[] rawHmac = mac.doFinal(text.getBytes());
+		String signature = new BASE64Encoder().encode(rawHmac);
+
+		// �������p�����[�^�ɒlj�
+		params.put("oauth_signature", signature);
+	}
+	
 	public String getAuthorization() {
 		return "";
 	}
+	
+	private int getUnixTime() {
+		return (int) (System.currentTimeMillis() / 1000L);
+	}
+
+	private String urlEncode(String string) {
+		try {
+			return URLEncoder.encode(string, "UTF-8");
+		} catch (UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+	}
 }