Online SHA1 hash Generator

Below i had encrypted a string varible using sha1. And now i would wish to decrypt data using sha1 function, but am going some where. Would some one come forward and guide me in proper way please.

Below is my code

<?php   $variable  = "tiger";   echo $variable;   $encrypt = sha1($variable);   echo $encrypt;   $decrypt = sha1($encrypt);   echo $decrypt; ?>

And i get output like this

tiger46e3d772a1888eadff26c7ada47fd7502d796e07989df2c8b5ea37eb7cfde0527d94c01a15257002

I'm storing the user password on the db as a sha1 hash.

Unfortunately I'm getting strange answers.

I'm storing the string as this:

MessageDigest cript = MessageDigest.getInstance("SHA-1");              cript.reset();              cript.update(userPass.getBytes("utf8"));              this.password = new String(cript.digest());

I wanted something like this -->

aff --> "0c05aa56405c447e6678b7f3127febde5c3a9238"

rather than

aff --> �V@\D~fx����:�8

I'm trying to retrieve the SHA-1 Fingerprint Certificate for my Flutter Project. This can usually be done going into the Gradle Panel on the right side in Android Studio and clicking on signingReport.

The problem is however, in Flutter, it doesn't show the Gradle Panel at all and after an hour of searching, I still couldn't find a way to get that panel to show.

I tried the Keytool way, but it tells me there's no such command in the Command Prompt. How do I get the SHA-1 Certificate for my flutter project? I need it for signing in my Flutter Project with Firebase Auth.

I've also searched in the Firebase Documentation, there is no documentation of how to find the SHA-1 in flutter. It simply says that SHA-1 is required for using Firebase Auth.

Related issue https://github.com/flutter/flutter/issues/24776

I'm trying to make a simple String to SHA1 converter in Java and this is what I've got...

public static String toSHA1(byte[] convertme) {    MessageDigest md = null;    try {        md = MessageDigest.getInstance("SHA-1");    }    catch(NoSuchAlgorithmException e) {        e.printStackTrace();    }     return new String(md.digest(convertme));}

When I pass it toSHA1("password".getBytes()), I get [�a�ɹ??�%l�3~��. I know it's probably a simple encoding fix like UTF-8, but could someone tell me what I should do to get what I want which is 5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8? Or am I doing this completely wrong?

I was reading a post in Troy Hunt's blog (https://www.troyhunt.com/ive-just-launched-pwned-passwords-version-2/), about a feature called "Pwned Passwords" that checks if your password is in a database with more than 1 billion leaked passwords.

To do this check without passing your password, the client code hash it and pass just the first five chars of this hash, the backend returns all the sha1 hashes of the passwords that starts with the prefix that you passed. Then, to check if the hash of your password is in the database or not, the comparison is made on client code.

And he put some info about the data of these hashed passwords...

1. Every hash prefix from 00000 to FFFFF is populated with data (16^5 combinations)
2. The average number of hashes returned is 478
3. The smallest is 381 (hash prefixes "E0812" and "E613D")
4. The largest is 584 (hash prefixes "00000" and "4A4E8")

In the comments, people was wondering if the presence of this "00000" is a coincidence or is math...

Could someone that understands the SHA1 algorithm explain it to us?