com.springcryptoutils.core.signature.Base64EncodedSignerImpl.java Source code

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Here is the source code for com.springcryptoutils.core.signature.Base64EncodedSignerImpl.java

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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.io.UnsupportedEncodingException;
import java.security.PrivateKey;

import org.apache.commons.codec.binary.Base64;

/**
 * The default implementation for providing base64 encoded versions of digital
 * signatures.
 *
 * @author Mirko Caserta (mirko.caserta@gmail.com)
 */
public class Base64EncodedSignerImpl implements Base64EncodedSigner {

    private final SignerImpl signer = new SignerImpl();

    private String charsetName = "UTF-8";

    /**
     * The signature algorithm. The default is SHA1withRSA.
     *
     * @param algorithm the signature algorithm
     */
    public void setAlgorithm(String algorithm) {
        signer.setAlgorithm(algorithm);
    }

    /**
     * The private key for signing the message.
     *
     * @param privateKey the private key
     */
    public void setPrivateKey(PrivateKey privateKey) {
        signer.setPrivateKey(privateKey);
    }

    /**
     * The charset to use when converting a string into a raw byte array
     * representation. The default is UTF-8.
     *
     * @param charsetName the charset name (default: UTF-8)
     */
    public void setCharsetName(String charsetName) {
        this.charsetName = charsetName;
    }

    /**
     * Sets the provider name of the specific implementation requested (e.g.,
     * "BC" for BouncyCastle, "SunJCE" for the default Sun JCE provider).
     *
     * @param provider the provider to set
     */
    public void setProvider(String provider) {
        signer.setProvider(provider);
    }

    /**
     * Signs a message.
     *
     * @param message the message to sign
     * @return a base64 encoded version of the signature
     */
    public String sign(String message) {
        try {
            final byte[] signature = signer.sign(message.getBytes(charsetName));
            return new String(Base64.encodeBase64(signature, false));
        } catch (UnsupportedEncodingException e) {
            throw new SignatureException("unsupported encoding: charsetName=" + charsetName, e);
        }
    }

}