SHA512 Online Hash Generador

I am using a hybrid cryptography where I encrypt hash of a large file and then verify it but every time I get a different hash.What am I doing wrong here?

public static void main(String[] args) throws Exception {        HybridCryptographyE ac = new HybridCryptographyE();        PrivateKey privateKey = ac.getPrivate("KeyPair/Source/privateKey");        PublicKey publicKey = ac.getPublic("KeyPair/Source/publicKey");        //Step 2 Generate Key and IV----------------        File directory = new File("/Users/aviral/Desktop/AES/SourceFile/");        File[] fList = directory.listFiles();        for (File file : fList){            String inFile = file.toString();            String outFile = file.toString().replace("SourceFile", "EncResult");                //Step1 Calculating hash here             Cipher cipher = Cipher.getInstance("AES/GCM/PKCS5Padding");            KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");            keyGenerator.init(AES_KEY_SIZE);            SecretKey key = keyGenerator.generateKey();            byte[] IV = new byte[GCM_IV_LENGTH];            SecureRandom random = new SecureRandom();            random.nextBytes(IV);            SecretKeySpec keySpec = new SecretKeySpec(key.getEncoded(), "AES");            GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(GCM_TAG_LENGTH * 8, IV);            cipher.init(Cipher.ENCRYPT_MODE, keySpec, gcmParameterSpec);            String hash=processFile(cipher, inFile, outFile);            //Step 3 Encrypt the hash generated in step 1 using the PvKS            String encrypted_msg = ac.encryptText(hash, privateKey);            System.out.println("Hash of file "+hash);            System.out.println("Encrypted Hash of file "+encrypted_msg);            //Step 5             String encodedKey=Base64.getEncoder().encodeToString(key.getEncoded());             String encodedIV=Base64.getEncoder().encodeToString(IV);                        String encodedtag=Base64.getEncoder().encodeToString("".getBytes());            System.out.println("ImpDataComing");            System.out.println(encodedKey);            System.out.println(encodedIV);             System.out.println(encodedtag);            String infodata=encodedKey+"|*|"+encodedIV+"|*|"+encodedtag;            System.out.println("InfoData");            System.out.println(infodata);            String infodata_enc = ac.encryptText(infodata, publicKey);            System.out.println("InfoData_Enc");            System.out.println(infodata_enc);            String finalproperwrite=encrypted_msg+"\n"+infodata_enc;            //Step 6             FileUtils.writeByteArrayToFile(new File(file.toString().replace("SourceFile", "EncResult")+".info"),finalproperwrite.toString().getBytes());            System.out.println("Step 1 Hash  of text is "+hash);            System.out.println("Step 2 Encrypted hash is "+encrypted_msg);            System.out.println("Step 3 Files Generated ");        }    }    static private String processFile(Cipher ci,String inFile,String outFile)            throws javax.crypto.IllegalBlockSizeException,            javax.crypto.BadPaddingException,            java.io.IOException, NoSuchAlgorithmException    {        MessageDigest mdb = MessageDigest.getInstance("SHA-512");        try (FileInputStream in = new FileInputStream(inFile);                FileOutputStream out = new FileOutputStream(outFile)) {            byte[] ibuf = new byte[8192];            int len;            while ((len = in.read(ibuf)) != -1) {                mdb.update(ibuf);                byte[] obuf = ci.update(ibuf, 0, len);                          if ( obuf != null ) out.write(obuf);            }            //Step 4 Encrypt the INPUTFILE using AES Key and IV            byte[] obuf = ci.doFinal();            byte[] messageDigestbuf =mdb.digest(obuf);            if ( obuf != null ) out.write(obuf);            BigInteger nob = new BigInteger(1, messageDigestbuf);            String hashtextb = nob.toString(16);             while (hashtextb.length() < 32) {                 hashtextb = "0" + hashtextb;            }            return hashtextb;        }    }}

During decryption hash calculation is not matching for my code.Also I notices that the hash value is different.i am a beginner to this, please help

I am quite new to Dart and I've trying to build an API in Dart. I am facing a problem with the hashing part, how can i get it to output 128 characters just like the method from python hashlib.sha512(out.encode('utf-8')).hexdigest().upper()

I've tried using crypto and pointycastleThe packages output a hash of length less than 128 unlike the one from the Python one.

So what is the best way I can generate sha512 hashes of length 128 in Dart?

As part of authentication of a json response, I have used hashlib.hmac sha512 for hashing the json response using a secret_key. But was surprised to see that different versions in python returned different hashed values for the same json, secret_key. Could someone help me out regarding this issue?

I'm trying to duplicate the following python code in Erlang:

python -c "import random,string,crypt;print crypt.crypt('example', '\$6\$5H0QpwprRiJQR19Y\$')"OUTPUT: $6$5H0QpwprRiJQR19Y$B8EBtKxKU4Poxi.qLsL/t7uoriHX/cdnn9kT7kTsUIvwKPR6oJLOl8NAH8vPT.BNPdEY7a4.rz8YhziecWQ6I/

From reading online:

• $6$ indicates this is a 512 hash
• '5H0QpwprRiJQR19Y' is the salt for the hash
• in the above code the passphase is 'example'

My current erlang code is below:

crypto:hash(sha512, "example5H0QpwprRiJQR19Y")

Which produces:

<<167,181,70,20,213,141,24,28,86,204,170,121,182,75,217,3,51,222,3,209,44,43,34,243,130,214,247,156,149,150,162,81,200,207,103,85,60,202,37,189,30,25,128,221,61,79,146,86,225,126,35,85,4,161,156,152,8,6,90,17,207,229,235,241>>

I've tried manipulating the return but can't get them to match.

With the same byte array, the result of performing a checksum using .NET Core 3.0's SHA512Managed class is different than the result of using the built-in shasum app in MacOS.

I've triple-checked the byte array is unmodified/identical by iterating over every byte position using File.ReadAllBytes().

Process in code:

var stream = asm.GetManifestResourceStream(resourceName);var data = new byte[stream.Length];stream.Read(data, 0, (int)stream.Length);var sha = new SHA512Managed();var checksum = sha.ComputeHash(data);

At the command line:

shasum -a512 ./myfile.dat

I'm receiving a good (expected) checksum value from the shasum utility, the iHex app from the AppStore, and the website "passwordsgenerator.net/sha512-hash-generator/".

I'm receiving a bad value from the .NET code above and from the a different website "online-convert.com". Both of which produce the identical bad result!

Is there more than one implementation of the SHA512 algorithm? Since I'm comparing byte arrays, there should be no nonsense involving character encoding, right? Is there something about compiling or reading back an embedded resource in MacOS I should know about?

Any tips or pointers would be greatly appreciated!