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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;
 
 import java.util.Map;
 
The default implementation for verifying the authenticity of messages using digital signatures when the public key alias can be configured on the side of the user of this class.

Author(s):
Mirko Caserta (mirko.caserta@gmail.com)
 
 
 	private Map<StringVerifiercache = new HashMap<StringVerifier>();
 
 
 	private String algorithm = "SHA1withRSA";
 
 	private String provider;

Sets the public key registry.

Parameters:
publicKeyRegistryByAlias the public key registry
 
 	public void setPublicKeyRegistryByAlias(PublicKeyRegistryByAlias publicKeyRegistryByAlias) {
 		this. = publicKeyRegistryByAlias;
 	}

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:
keyStoreChooser the keystore chooser
publicKeyChooserByAlias the public key chooser
message the message to sign
signature the digital signature
Returns:
true if the authenticity of the message is verified by the digital signature
 
 	public boolean verify(KeyStoreChooser keyStoreChooserPublicKeyChooserByAlias publicKeyChooserByAliasbyte[] message,
 			byte[] signature) {
 		Verifier verifier = .get(cacheKey(keyStoreChooserpublicKeyChooserByAlias));
 
 		if (verifier != null) {
 			return verifier.verify(messagesignature);
 		}
 
 		VerifierImpl verifierImpl = new VerifierImpl();
 		verifierImpl.setAlgorithm();
 		verifierImpl.setProvider();
 		PublicKey publicKey = .get(keyStoreChooserpublicKeyChooserByAlias);
 
 		if (publicKey == null) {
 			throw new SignatureException("public key not found in registry: keyStoreName="
 					+ keyStoreChooser.getKeyStoreName() + ", alias=" + publicKeyChooserByAlias.getAlias());
 		}
 
 		verifierImpl.setPublicKey(publicKey);
		.put(cacheKey(keyStoreChooserpublicKeyChooserByAlias), verifierImpl);
		return verifierImpl.verify(messagesignature);
	}
	private static String cacheKey(KeyStoreChooser keyStoreChooserPublicKeyChooserByAlias publicKeyChooserByAlias) {
		return new StringBuffer().append(keyStoreChooser.getKeyStoreName()).append('-').append(
				publicKeyChooserByAlias.getAlias()).toString();
	}
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