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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 verifying the authenticity of messages using digital signatures.

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

The public key for verifying the message.

Parameters:
publicKey the public key
	public void setPublicKey(PublicKey publicKey) {
		this. = publicKey;
	}

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;
	}

Verifies the authenticity of a message using a digital signature.

Parameters:
message the original message to verify
signature the digital signature
Returns:
true if the original message is verified by the digital signature
	public boolean verify(byte[] messagebyte[] signature) {
		try {
			// this way signatureInstance should be thread safe
			final Signature signatureInstance = (( == null) || (.length() == 0)) ? Signature
			signatureInstance.initVerify();
			signatureInstance.update(message);
			return signatureInstance.verify(signature);
			return false;
catch (Exception e) {
			throw new SignatureException("error verifying signature"e);
		}
	}
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