/* Copyright (c) 2009 Matthias Kaeppler
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package oauth.signpost.signature;
import java.io.UnsupportedEncodingException;
import java.security.GeneralSecurityException;
import javax.crypto.Mac;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import oauth.signpost.OAuth;
import oauth.signpost.exception.OAuthMessageSignerException;
import oauth.signpost.http.HttpRequest;
import oauth.signpost.http.HttpParameters;
@SuppressWarnings("serial")
public class HmacSha1MessageSigner extends OAuthMessageSigner {
private static final String MAC_NAME = "HmacSHA1";
@Override
public String getSignatureMethod() {
return "HMAC-SHA1";
}
@Override
public String sign(HttpRequest request, HttpParameters requestParams)
throws OAuthMessageSignerException {
try {
String keyString = OAuth.percentEncode(getConsumerSecret()) + '&'
+ OAuth.percentEncode(getTokenSecret());
byte[] keyBytes = keyString.getBytes(OAuth.ENCODING);
SecretKey key = new SecretKeySpec(keyBytes, MAC_NAME);
Mac mac = Mac.getInstance(MAC_NAME);
mac.init(key);
String sbs = new SignatureBaseString(request, requestParams).generate();
OAuth.debugOut("SBS", sbs);
byte[] text = sbs.getBytes(OAuth.ENCODING);
return base64Encode(mac.doFinal(text)).trim();
} catch (GeneralSecurityException e) {
throw new OAuthMessageSignerException(e);
} catch (UnsupportedEncodingException e) {
throw new OAuthMessageSignerException(e);
}
}
}