Online SHA384 Hash Generator

I am trying to SHA encoding for the first time but I am not able to get rid of an error (below).

MessageDigest.getInstance cannot be resolved to a type

My code is below:

private boolean verifyPassword(char[] pass) throws FileNotFoundException {        RandomAccessFile passFile = new RandomAccessFile("login.txt","r");        MessageDigest md = new MessageDigest.getInstance("SHA-512");        return false;    }

I haven't completed the code but I was wondering why I was getting that error. This is in eclipse inside a class that extends a JFrame. Also, I have all the necessary import statements.

I've a simple program that hashes a string.

from Crypto.Hash import SHA512PAYLOAD = "Hello world"def sha(message):    h = SHA512.new()    h.update(message.encode('ascii'))    return h.digest()if __name__ == '__main__':    print(sha(PAYLOAD))    print(type(sha(PAYLOAD)))

This is the output,

b'\xb7\xf7\x83\xba\xed\x82\x97\xf0\xdb\x91tb\x18O\xf4\xf0\x8ei\xc2\xd5\xe5\xf7\x9a\x94&\x00\xf9r_X\xce\x1f)\xc1\x819\xbf\x80\xb0l\x0f\xff+\xdd4s\x84R\xec\xf4\x0cH\x8c"\xa7\xe3\xd8\x0c\xdfo\x9c\x1c\rG'

I fail to understand how is this a byte array?

Had a scenario where I need to call a vendor rest api, a key attribute has a definition of 40 in length however my upstream mapping field is of length ~500, was thinking to use SHA1 to hash it, so that the upstream value always able to map to the shorter version of downstream field. Any flaw with this design? Thanks!

I was doing a git course in Pluralsight and realized there`s a clipID value inside of the url header that uniquely identify a learning course.

Like that 5a64eace-6ebd-4db1-b0c0-921dbba2d0b9.

The ID has a pattern that is 8alpha-4alpha-4alpha-4alpha-12alpha characters.

Why is that? Is each of the alphanumeric element the hash representation of some data like SHA(Name)-SHA(date)-SHA(time)? Is it a good practice to create an ID like that?

I've just built a new Wordpress website and I'm trying to import my members from a previous website to the new one. The import was successful, except now all logins fail. My old website used SHA1 hash to encrypt passwords, whereas Wordpress uses MD5. Is it possible to convert all my SHA1 passwords to MD5 and keep the same passwords?

When the website goes live I want all my previous members to be able to login with the same passwords as before (seamless as possible).