Initial commit

src/main/java/org/scribe/services/HMACSha1SignatureService.java

@@ -0,0 +1,46 @@
+package org.scribe.services;
+
+import javax.crypto.*;
+import javax.crypto.spec.*;
+
+import org.apache.commons.codec.binary.*;
+import org.scribe.exceptions.*;
+import org.scribe.utils.*;
+
+public class HMACSha1SignatureService implements SignatureService
+{
+
+  private static final String EMPTY_STRING = "";
+  private static final String CARRIAGE_RETURN = "\r\n";
+  private static final String UTF8 = "UTF-8";
+  private static final String HMAC_SHA1 = "HmacSHA1";
+  private static final String METHOD = "HMAC-SHA1";
+
+  public String getSignature(String baseString, String apiSecret, String tokenSecret)
+  {
+    try
+    {
+      Preconditions.checkEmptyString(baseString, "Base string cant be null or empty string");
+      Preconditions.checkEmptyString(apiSecret, "Api secret cant be null or empty string");
+      return doSign(baseString, apiSecret + '&' + tokenSecret);
+    } 
+    catch (Exception e)
+    {
+      throw new OAuthSignatureException(baseString, e);
+    }
+  }
+
+  private String doSign(String toSign, String keyString) throws Exception
+  {
+    SecretKeySpec key = new SecretKeySpec((keyString).getBytes(UTF8), HMAC_SHA1);
+    Mac mac = Mac.getInstance(HMAC_SHA1);
+    mac.init(key);
+    byte[] bytes = mac.doFinal(toSign.getBytes(UTF8));
+    return new String(Base64.encodeBase64(bytes)).replace(CARRIAGE_RETURN, EMPTY_STRING);
+  }
+
+  public String getSignatureMethod()
+  {
+    return METHOD;
+  }
+}