Java Hash Calculate getHash(InputStream in, String algorithm)

Description

get Hash

License

Apache License

Declaration

public static String getHash(InputStream in, String algorithm) throws NoSuchAlgorithmException, IOException 

Method Source Code

//package com.java2s;
/*//  w w  w. j  a  v a 2s .  c om
 * Zed Attack Proxy (ZAP) and its related class files.
 * 
 * ZAP is an HTTP/HTTPS proxy for assessing web application security.
 * 
 * Copyright 2014 The ZAP Development Team
 * 
 * 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.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String getHash(InputStream in, String algorithm) throws NoSuchAlgorithmException, IOException {
        MessageDigest md = MessageDigest.getInstance(algorithm);
        byte[] dataBytes = new byte[1024];
        int nread = 0;

        while ((nread = in.read(dataBytes)) != -1) {
            md.update(dataBytes, 0, nread);
        }

        byte[] mdbytes = md.digest();

        //convert the byte to hex format
        StringBuilder sb = new StringBuilder("");
        for (int i = 0; i < mdbytes.length; i++) {
            sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
        }

        return sb.toString();
    }

    public static String getHash(File file, String algorithm) throws NoSuchAlgorithmException, IOException {
        FileInputStream fis = new FileInputStream(file);
        try {
            return getHash(fis, algorithm);
        } finally {
            fis.close();
        }
    }
}

Related

1. getHash(byte[]... bytesToHash)
2. getHash(File file)
3. getHash(File file, String hashType)
4. getHash(final byte[] data, final String hashAlgorithm)
5. getHash(final String text, final Charset charset, final MessageDigest algorithm)
6. getHash(InputStream is, String algorithm)
7. getHash(int iterationNb, String password, byte[] salt)
8. getHash(String algorithm, int i)
9. getHash(String credentials)