com.monarchapis.driver.hash.HasherUtils.java Source code

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Here is the source code for com.monarchapis.driver.hash.HasherUtils.java

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/*
 * Copyright (C) 2015 CapTech Ventures, Inc.
 * (http://www.captechconsulting.com) All Rights Reserved.
 *
 * 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 com.monarchapis.driver.hash;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.Validate;

import com.monarchapis.driver.exception.ApiException;

/**
 * Provides utility methods related to hashing operations.
 * 
 * @author Phil Kedy
 */
public final class HasherUtils {
    /**
     * The algorithm translation dictionary lookup.
     */
    private static Map<String, String> algrithmLookup = new HashMap<String, String>();

    static {
        algrithmLookup.put("md5", "MD5");
        algrithmLookup.put("sha1", "SHA-1");
        algrithmLookup.put("sha256", "SHA-256");
        algrithmLookup.put("sha384", "SHA-384");
        algrithmLookup.put("sha512", "SHA-512");
    }

    private HasherUtils() {
    }

    /**
     * Translates a simple algorithm name to the Java standard name.
     * 
     * @param algorithm
     *            The simple algorithm name
     * @return the Java algorithm name
     */
    public static String getMessageDigestAlgorithm(String algorithm) {
        Validate.notBlank(algorithm, "algorithm is a required parameter.");

        String digestAlgorithm = algrithmLookup.get(algorithm.toLowerCase());

        if (digestAlgorithm == null) {
            throw new ApiException("Invalid algorithm " + algorithm);
        }

        return digestAlgorithm;
    }
}