com.couchbase.client.java.util.DigestUtils Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 Couchbase, 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 com.couchbase.client.java.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;

import com.couchbase.client.core.annotations.InterfaceAudience;

/**
 * Utility methods around hashes, message digests, etc...
 *
 * @author Simon Baslé
 * @since 2.2
 */
@InterfaceAudience.Private
public class DigestUtils {

    /**
     * Hashes the source with SHA1 and returns the resulting hash as an hexadecimal string.
     *
     * @param source the text to hash.
     * @return the SHA1 hash of the source, in hexadecimal form.
     */
    public static String digestSha1Hex(String source) {
        String sha1 = "";
        try {
            MessageDigest crypt = MessageDigest.getInstance("SHA-1");
            crypt.reset();
            crypt.update(source.getBytes("UTF-8"));
            sha1 = byteToHex(crypt.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return sha1;
    }

    private static String byteToHex(final byte[] hash) {
        Formatter formatter = new Formatter();
        for (byte b : hash) {
            formatter.format("%02x", b);
        }
        String result = formatter.toString();
        formatter.close();
        return result;
    }
}