net.oauth.jsontoken.crypto.AsciiStringVerifier.java Source code

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Here is the source code for net.oauth.jsontoken.crypto.AsciiStringVerifier.java

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/**
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file 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 net.oauth.jsontoken.crypto;

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

import java.security.SignatureException;

/**
 * A Verifier that can verify Strings (as opposed to byte arrays), assuming
 * that the String contains characters in the US-ASCII charset.
 */
public class AsciiStringVerifier {

    private final Verifier verifier;

    /**
     * Public constructor.
     *
     * @param verifier A {@link Verifier} that can verify signatures on byte arrays.
     */
    public AsciiStringVerifier(Verifier verifier) {
        this.verifier = verifier;
    }

    /**
     * Verifies a signature on an ASCII string.
     * @param source the source that was signed.
     * @param signature the signature on the source.
     * @throws SignatureException if the signature doesn't verify.
     */
    public void verifySignature(String source, byte[] signature) throws SignatureException {
        verifier.verifySignature(StringUtils.getBytesUsAscii(source), signature);
    }
}