com.yubico.client.v2.Signature Maven / Gradle / Ivy
package com.yubico.client.v2;
/* Copyright (c) 2011, Simon Buckle. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
Written by Simon Buckle , September 2011.
*/
import com.yubico.client.v2.exceptions.YubicoSignatureException;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
public class Signature {
private final static String HMAC_SHA1 = "HmacSHA1";
public static String calculate(String data, byte[] key)
throws YubicoSignatureException {
try {
SecretKeySpec signingKey = new SecretKeySpec(key, HMAC_SHA1);
Mac mac = Mac.getInstance(HMAC_SHA1);
mac.init(signingKey);
byte[] raw = mac.doFinal(data.getBytes("UTF-8"));
// Base64 encode the result, use old API call to work on android
return DatatypeConverter.printBase64Binary(raw);
} catch (NoSuchAlgorithmException e) {
throw new YubicoSignatureException("No such algorithm (HMAC_SHA1?)", e);
} catch (InvalidKeyException e) {
throw new YubicoSignatureException("Invalid key in signature.", e);
} catch (IllegalStateException e) {
throw new YubicoSignatureException("Illegal state in signature", e);
} catch (UnsupportedEncodingException e) {
throw new YubicoSignatureException("Unsupported encoding (utf8?)", e);
}
}
}