온라인 MD5 해시 생성기

That's not a real problem but is related to a sign plugin problem that I am trying to solve (I've already read a lot about it). It will be helpful to better understand the export process of a product. I have an old eclipse 3.x RCP application. I'm wondering why when I export my RCP product (using "Eclipse product export wizard" from .product file) In the artifacts.xml file I find for some plugins the md5 tag and not for others? What is the condition for the presence of this tag?

I mean

<artifact classifier='osgi.bundle' id='my.plugin' version='2.0.3.201810131801'>  <properties size='3'>    <property name='artifact.size' value='57471'/>    <property name='download.size' value='57471'/>    <property name='download.md5' value='0126ed09addfcca403802513ad25325e'/>  </properties></artifact>

while I have other like this

 <artifact classifier='osgi.bundle' id='my.plugin2' version='2.0.0.201502051801'>  <properties size='2'>    <property name='artifact.size' value='4096'/>    <property name='download.size' value='11318'/>  </properties></artifact>

In some cases I found that also the same plugin from one particular version doesn't have anymore the md5 tag that it had before.

I have the following (pretty nasty) code snippet, which is generating a md5-hash over the content of an item:

protected String createHashFromContentNew() throws CrawlerException {    final StringBuilder builder = new StringBuilder();    if (getContent() != null) {        builder.append(new String(getContent()));    }    if (builder.length() == 0) {        throw new CrawlerException(hashErrorMessage("the content of this item is empty!"));    } else {        return MD5Utils.generateMD5Hash(builder.toString());    }}

the MD5Utils.generateMD5Hash(builder.toString()); function could also be used with a InputStream.

getContent() returns a byte[].

This actually worked ok until I got items with huge sized contents. Since this is used in an multi-threaded environment it uses up a lot of RAM by holding the content multiple times.

I now want to use the generateMD5Hash() with the InputStream, to stop loading everything into the RAM. The problem is, that the outcoming hash must be the same as in the current function for all previously generated hashes.

Any ideas how to achive that in a proper way?

i want to get the last source fmb for a fmx file as i have one .fmx and 5 .fmbs i want to know which one is the latest source .fmb in seperate directories

i have created multible shell script to achive that it only works if i have the same fmx file in both directories using md5sum to get the hash value

so i figured that i shall all 5 sources into .fmx with diffrent names and get through them to find a match but check the below scenario

i have test.fmx with md5sum with hash : 7095ab6bac45a78d80cb4db80ddb44a2when i compile the test.fmb into test.fmx

i got the hash :426f876ae5deeb0713e37719c2fb0c34 when i compiled the same test.fmb again a few seconds later with the same paramters i get the hash :c7bc4b9781fdecaec8a60ee7c71644a1

md5sum should be the same across the platforms why does is change like that ? plus is there any other way to compare the two files ??????

What's the best recommended method/approach to check on the "file originality" of large quantities of files in a directory?

Considering large quantities of files needed to transfer from one site to another site, there may possibility that the files are corrupted or unauthorized modification during transferring process.

Currently I am using Last Modified Date to check on the file to verify whether the file still remain the "original" copies.I found that through file checksum(MD5/sha1) maybe a better approach compared to check on Last Modified Date on files.

1. Is it by using file MD5 is best approach/method to check/verify the files? Or there is any better alternate method/approach?
2. How about the performance side? Cpu intensive? By generating MD5/sha1 are efficient and quick enough to process large quantities of files? Will size of file affect the MD5 generating time taken?

Reference: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-filehash?view=powershell-6

I am sending thousands of images from one system to another over FTP. Initially, I'll dump all the images, but later on, I want to send only those images which are changed.

I haven't found any concrete solution to figure out changed images based on the updated timestamp in windows. Therefore, I decided the following approach:

1.) Generate checksums for all the files and store them somewhere. Maybe database or filesystem.

2.) Every time I send files to another system, compare the checksums and send only the files which have different checksums.

In order to test the above, I tried to generate a checksum (SHA and MD5) for two different images, and the checksum was the same.

Following is the sample code:

package com.test;import java.io.FileInputStream;import java.io.IOException;import org.apache.commons.codec.digest.DigestUtils;public class TestHash {     public static void main(String[] args) throws IOException {            String checksumSHA256 = DigestUtils.sha256Hex(new FileInputStream("monkey_11.jpg"));            System.out.println("checksumSHA256 : " + checksumSHA256);            String checksumMD5 = DigestUtils.md5Hex(new FileInputStream("monkey_11.jpg"));            System.out.println("checksumMD5 : " + checksumMD5);            String checksumSHA256_1 = DigestUtils.sha256Hex(new FileInputStream("monkey.jpg"));            System.out.println("checksumSHA256 : " + checksumSHA256_1);            String checksumMD5_1 = DigestUtils.md5Hex(new FileInputStream("monkey.jpg"));            System.out.println("checksumMD5 : " + checksumMD5_1);        }}

I'm wondering why the checksums are the same? Is there another way to identify updated images?