How do we make the hash value of SHA256 through CryptoJS equal to the hash value of SHA256 using Java Message Digest?

var result = "";
var reader = new FileReader();
reader.onload = function(event) {
    result = CryptoJS.SHA256(event.target.result).toString();
};
reader.readAsBinaryString(tempFile);

The hash value of a file in JavaScript is 98a0996953e89a6d388057ae9168f004c9d1fb4ec3d863d1ab35fefe554bb214

public String sha256(String filepath) throws Exception {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        FileInputStream fis = new FileInputStream(filepath);

        byte[] dataBytes = new byte[1024];

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

        byte[] mdbytes = md.digest();

        /*String shaHex = DatatypeConverter.printHexBinary(mdbytes);*/
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < mdbytes.length; i++) {
            sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
        }
        fis.close();
        return sb.toString();
    }

/* */ from the method you run
SHA256 hash = new SHA256();
System.out.println("java hash : "+hash.sha256(filePath+filename));

The hash value in java is f60dc63c2653b4f35dbf14ac5ad4e9a99e87f5af193b6b599e361c493d5d23a9

It comes out like this. How can I get the same value when the two are different?

cryptojs sha256 java javascript

2022-09-22 19:33

1 Answers

jshell> import java.sequ
jshell> import java.seq
jshell> import java.security.*

jshell> public String sha256(String filepath) throws Exception {
   ...>         MessageDigest md = MessageDigest.getInstance("SHA-256");
   ...>         FileInputStream fis = new FileInputStream(filepath);
   ...>
   ...>         byte[] dataBytes = new byte[1024];
   ...>
   ...>         int nread = 0;
   ...>         while ((nread = fis.read(dataBytes)) != -1) {
   ...>             md.update(dataBytes, 0, nread);
   ...>         }
   ...>
   ...>         byte[] mdbytes = md.digest();
   ...>
   ...>         /*String shaHex = DatatypeConverter.printHexBinary(mdbytes);*/
   ...>         StringBuffer sb = new StringBuffer();
   ...>         for (int i = 0; i < mdbytes.length; i++) {
   ...>             sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
   ...>         }
   ...>         fis.close();
   ...>         return sb.toString();
   ...>     }
|  |  created method sha256(String)

jshell> sha256("/usr/bin/gcc")
$4 ==> "5aa1a5dbef17daf4563c88b4e891fecaa17f4557ff0f4cc824531c3a1d8a43ea"

*python

In [3]: import sys

In [4]: import hashlib

In [5]: BUF_SIZE = 65536

In [6]: sha2 = hashlib.sha256()

In [7]: with open('/usr/bin/gcc', 'rb') as f:
   ...:     ...:     while True:
   ...:         ...:         data = f.read(BUF_SIZE)
   ...:         ...:         if not data:break
   ...:         ...:         sha2.update(data)

In [9]: print("SHA2: {0}".format(sha2.hexdigest()))
SHA2: 5aa1a5dbef17daf4563c88b4e891fecaa17f4557ff0f4cc824531c3a1d8a43ea

The Java code written by the questioner is fine.

Check out how to use the jscrytojs library and look at the bug tracker in that library.

2022-09-22 19:33

If you have any answers or tips

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