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 /*
  * Copyright 2012 Mirko Caserta
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this software 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 com.springcryptoutils.core.signature;
The default implementation for providing digital signatures.

Author(s):
Mirko Caserta (mirko.caserta@gmail.com)
public class SignerImpl implements Signer {
	private String algorithm = "SHA1withRSA";
	private String provider;

The private key for signing the message.

Parameters:
privateKey the private key
	public void setPrivateKey(PrivateKey privateKey) {
		this. = privateKey;
	}

The signature algorithm. The default is SHA1withRSA.

Parameters:
algorithm the signature algorithm
	public void setAlgorithm(String algorithm) {
		this. = algorithm;
	}

Sets the provider name of the specific implementation requested (e.g., "BC" for BouncyCastle, "SunJCE" for the default Sun JCE provider).

Parameters:
provider the provider to set
	public void setProvider(String provider) {
		this. = provider;
	}

Signs a message.

Parameters:
message the message to sign
Returns:
the signature
	public byte[] sign(byte[] message) {
		try {
			// this way signatureInstance should be thread safe
			final Signature signatureInstance = (( == null) || (.length() == 0)) ? Signature
			signatureInstance.initSign();
			signatureInstance.update(message);
			return signatureInstance.sign();
catch (Exception e) {
			throw new SignatureException("error generating the signature: algorithm=" + e);
		}
	}
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