Java Checksum Calculate createChecksum(File file, String shaAlgo)

Description

create Checksum

License

Apache License

Declaration

public static String createChecksum(File file, String shaAlgo) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import javax.xml.bind.DatatypeConverter;
import java.io.File;
import java.io.FileInputStream;

import java.io.InputStream;

import java.security.MessageDigest;

public class Main {
    public static String createChecksum(File file, String shaAlgo) {
        try {//from  w  ww .j a v a2s .  c  o  m
            InputStream fis = new FileInputStream(file);
            byte[] buffer = new byte[1024];
            MessageDigest complete = MessageDigest.getInstance(shaAlgo);
            int numRead;

            do {
                numRead = fis.read(buffer);
                if (numRead > 0) {
                    complete.update(buffer, 0, numRead);
                }
            } while (numRead != -1);

            fis.close();
            return DatatypeConverter.printHexBinary(complete.digest()).toLowerCase();
        } catch (Exception e) {
            throw new IllegalStateException(
                    "could not create checksum for " + file + " and algo " + shaAlgo + ": " + e.getMessage(), e);
        }
    }
}

Related

1. checksum(String nmea)
2. checksum_icmpv6(byte pkt[])
3. checksumBytesToString(byte[] digestBytes)
4. checksumFile(File file)
5. checksumLength(int algorithmCode, int dataLength)
6. generateChecksum(InputStream is)
7. generateChecksum(String path, String flavor)
8. generateChecksum(String pType, String pInFile)
9. generateCheckSum(String string)